Pace Representatives NEWS!!


October 28, 2008

Sustainable Single Ply Roofing Update

Boston MA, Sika Sarnafil, Dow Chemical, and Georgia Pacific announce in New England a 20/40 year Renewable Single Ply Roofing System, The EcoSmart Roof. This system is designed to be sustainable and a dramatic move away from the typical disposable single ply roofing systems.

Sika Sarnafil will issue a 20 year water tight warrantee on their Sarnafil single ply membrane, along with a certificate of recyclability. Sarnafil membrane can now be recycled after its life back at their plant in Canton MA. Please see the Marriott Long Wharf project profile for more detail.

Dow Chemical will issue a 40 year reuse warrantee on Styrofoam Deck Mate roof insulation. Deck Mate's high R-value, high compressive strength and its resistance to moisture makes it permanent roof insulation. This insulation has the same performance as the cavity wall and below grade permanent building insulation. Deck Mate is also fire approved by every building code in the United States for direct application to metal deck.

Georgia-Pacific Dens Deck cover board protects the insulation against mechanical and roof traffic damage during the life of the roof, as well as when it is time to reroof. Dens Deck has a high compressive strength, is mold resistant, and is the only cover product with a moisture resistant treated gypsum core.

This singly ply roof system is environmentally responsible and its goal is to eliminate roofing material from entering the waste stream in the future. Most importantly this system costs the same or is as competitive as the typical disposable single ply roofing systems now being specified.
Click here for EcoSmart Literature
Click here for specifications and details
Click here for Marriott Wharf project profile



November 2007

Even the dumbest of the Three Little Pigs did not build their house out of paper!!
Georgia Pacific, who introduced Dens Glass to the construction market, has now applied the same technology of a paperless, fiberglass matte, silicone-treated gypsum board to interior gypsum as well. GP Dens Armor Plus, and NEW Dens Armor Abuse Guard are both paperless boards that can be finished with latex paint. Eliminating all treated and untreated paper (both are a food for mold) from the wall construction is the key to a sustainable design. For more information, click the link below.
DensArmor Plus® Paperless Drywall



April 2007

AIR BARRIER WINDOW RETURN WITH WOOD BLOCKING
One of the most asked questions we get is how to do a window return with Carlisle 705 that has wood blocking extending into the cavity. Below is one way to do this return with limited use of 704 mastic.
Click to see the details.



December 2006

New Heckmann Wing Nut Pos-i-tie
The most used brick tie with insulation out bound of the studs Pos-I-Tie just got better. The new Wing Nut Pos-I-Tie allows for:
  • 3/4" adjustment for a variety of thickness of Dens-Glass 1/2" or 5/8"
  • Out of plane wall assembles
  • Varying thickness of air barriers
  • The new pintle wire tie allows for vertical adjustment of up to 1-1/4" up or down for easy and proper embedment in the mortar bed.

Project:

Baystate Commons, Westborough, MA

Architect:

Gorman Richardson Architects, Hopkinton, MA

Mason:

Marmello Brothers, Dartmouth, MA


Click to see Data Sheet



June 2006

New High R-Value Design C
High R-value walls with air barriers can be designed to be cost effective and still balance the wall's dew point. Pace Design C has an overall wall R-value of 23. Both Dow Chemical's dew point analysis software, and Oak Ridge's WUFI analysis confirms that this wall works in cold climates. The wall design consists of 2 in. Extruded Insulation Styrofoam out side of the studs; Carlisle 705 air barrier; Dens Glass; and steel stud with 1.5 in. Dow polyurethane spray insulation on the inside of the cavity at the back of the Dens Glass. The advantages:
  • High R-value
  • Reduction in the wall thickness by using a maximum of 2 in. insulation out bound of the studs, which reduces the extra cost of larger foundations, steel, ties, and window trim.
  • Dow spray foam inside seals the back of the wall and insulates the short circuits that occur with fasteners going through the stud.
  • Spray foam is available in Froth Paks and large drums depending on the contractor's needs for the job.
Design C



July 14, 2005

Ref- What is the expected savings of an effective air barrier on a commercial building?
The use of air barriers on commercial buildings is becoming the standard building design, as building codes are requiring them and architects recognize all their benefits. The question we have been asked repeatedly over the past four years, concerns the amount of energy savings that a commercial building should realize by an effective air barrier. The National Institute of Standards and Technology (NIST) has just completed a comprehensive study on the subject. They found that the use of an effective air barrier like Carlisle Barriseal or Carlisle 705 can achieve a savings in energy of more then 36% in cold climates. To view the complete study refer to the link below.
NIST Study



January 21, 2005

GP DENS ARMOR PLUS A KEY PRODUCT TO REDUCING THE CONSTRUCTION CYCLE AND ACHIEVING A PAPERLESS WALL
Weather is a major factor in the construction cycle of a new building. That is why it is often referred to as a wet process, particularly here in New England. GP recognized this 19 years ago with the development of Dens Glass Gold, a paperless glass mat, moisture treated exterior gypsum board. Dens Glass Gold has become the standard in the industry for exterior sheathing due to its weather resistant and mold resistant properties.
GP again has responded to the challenges of the construction industry, and has developed a Dens Glass Gold for the interior, marketed under the brand name Dens Armor Plus. Dens Armor Plus is paperless glass mat moisture treated gypsum board that finishes like paper gypsum. Its ability to resist moisture and mold allows construction to continue during the wet weather before the roof, windows or doors are in place.
Below is a typical project demonstrating the use of Dens Armor Plus, and how construction can begin on the interior before the building is weather tight.

Project:

Brooksby Village, Peabody MA

Architect:

SEA Consultants, Cambridge MA

GC:

Erickson Construction, Baltimore MD

Drywall Contractor:

Universal Drywall, Hookset NH


For more information on Dens Armor Plus click here



December 13, 2004

EXCALATING COST OF POLYISOCYANURATE ROOF INSULATION

The cost of Polyisocyanurate (ISO) roof insulation has risen to an all time high in 2004, and is expected to continue its increase each quarter through 2005. The increases are due to a worldwide shortage of MDI, a key chemical in the manufacture of the product.

Roof insulation is the major cost for a roof system. Today ISO is priced comparable to Extruded Polystyrene and will be more then Extruded Polystyrene in 2005 for the first time ever. Extruded Polystyrene roof insulation in recognized as a better performing product for roof applications, and delivers more value for the insulation dollar spent. Below are some facts about Extruded Polystyrene roof insulation.

Dow Deck Mate Extruded Polystyrene Roof Insulation

  • Deck Mate has all the major building code approvals to be placed directly onto a metal deck without a thermal barrier.
  • Due to Deck Mate's superior resistance to moisture, it is reusable when it is time to re-roof.
  • Dow Chemical offers a 30 year reuse warrantee on Deck Mate.
  • For Class A roof systems (fire protection from above), 1/2" GP Dens Deck can be used as a cover board on EPDM, PVC, TPO, and built up roofs.
  • Single source 15 and 20 year roof warrantees with Extruded Polystyrene are offered by the major roof manufacturers on EPDM, PVC, and TPO.
Click here for 30 year warrantee
Click here for data sheet on Dens Deck
Click here for guide specification on Design A roof



September 8, 2004

LEEDTM Credits for Extruded Polystyrene and Polyisocyanurate Insulation

The U. S. Green Building Council has developed a system to rate the environmental designs of buildings. The Leadership in Energy and Environmental Design (LEEDTM) rating system allows design professionals to accumulate credits based on meeting certain criteria. For information on the number of credits for rigid insulation please see the insulation technical note below.
LEEDTM Rating for Rigid Insulation



August, 2004

Commercial mortgage lenders are beginning to set new guidelines for loans due to mold problems:

A recent article in Mortgage Banking Magazine by Charles Perry, Jr., outlines the changes the lending institutions are likely to put into place to protect their portfolios against mold problems.

Mr. Perry points out that the insurance industry is excluding mold protection in their policies. This leaves the lenders who typically hold 80% of the risk of the property exposed to potentially non-performing loans, when mold becomes an issue.

The new guidelines that the Mortgage Banking Association (MBA) are working on are based on "smart building practice". This may include eliminating paper faced gypsum, and wall systems that trap condensation. The new MA code and the details on our web site meet these potential new guidelines. In fact Georgia Pacific has taken the lead with their line of paperless gypsum Dens-Guard products: Dens-Glass for the exterior, Dens-Armor for interior, Dens-Shield for tile, and Dens-Deck for roofing.
Mortgage Banking Article



April 27, 2004

Best Practice Brick And Block
To effectively install rigid insulation in a brick and block cavity wall with or without an air barrier there needs to be a "SYSTEM". The system must enable the wall to be put together easily with structurally sound results. All too often insulation is friction fit between eye ties, or adhesive is relied on as the long term securement of the insulation. In many of these installations mortar droppings on the block and eye ties do not allow the insulation to lay flat and tight against the block. If the insulation is not flat against the block and the insulations joints are not tight, a chimney effect, or convective loop of cold air will flow behind the insulation. This can significantly reduce the effectiveness of the insulation.
To prevent air movement behind the insulation, a mechanical brick tie that also secures the insulation to the block should be used. The type of insulation should be 4 x 8 extruded polystyrene that has shiplap edges. This system of attachment along with large sheets of shiplap insulation will deliver the designed R-value to the wall.
When an air barrier is applied to a block wall with eye ties, there is a real problem achieving an air tight seal around the ties, and keeping the block clean of mortar. The use of a Positie brick tie eliminates eye ties and the problems assoiated with applying an air barrier. The Positie system enables the mortar joints to be struck flush, and the block work kept clean for a seamless air tight application of the air barrier.
The following are best practice photos and descriptions for installing rigid insulation and brick ties over an air barrier system.

Job:

Worcester State College, Worcester MA

Architect:

ADD Inc, Cambridge MA

General Contractor:

Suffolk Construction, Boston MA

Mason:

Commercial Masonry, Plymouth MA

Air Barrier Contractor:

Premier Caulking, Londonderry NH

Wall Assembly:

 8" Block
Carlisle Barriseal
2" Shiplap Styrofoam
Posities tapcons brick ties
2" air space
Brick
Air Barrier- Carlisle CCW Barriseal
Advantages: Water based asphalt emulsion, cures to form a flexible monolithic air/vapor barrier system
Single source responsibility. Carlisle offers complete line of air/vapor barrier and waterproofing systems:

Carlisle CCW Barriseal roll or spray grade air/vapor systems
Carlisle CCW 705 40 mil sheet membrane air/vapor barrier
Carlisle CCW thru-wall flashing
Carlisle CCW window and door flashing
Carlisle CCW 801 below grade 60 mil sheet membrane
Carlisle Barricoat below grade spray or roll membrane
Temporary Adhesive For Insulation- Carlisle CCW Cav-Grip
Advantages: Installer can easily attach insulation and do a complete insulation job without looking for studs
Membrane is protected right away from construction damage and UV rays
Insulation-Dow Styrofoam Cavitymate SC 4 x 8 Shiplap
Advantages: Dow extruded polystyrene proven over 50 years to be moisture resistant
Long term stable high R-value
4 x 8 shiplap boards limits joints and enables a total insulation job
CMHC recommends the best way to avoid condensation is to eliminate all insulation from the stud space and only insulate the cavity.
Cavitymate over the air barrier protects the membrane from thermal cycles
Cavitymate shiplap acts as an additional plane against water.
Brick Tie- Heckmann Posi-tie
Advantages: Millions of Posi-ties have been installed in the US since 1985.
Posi-ties have passed zero air and water testing with Carlisle 705 air/vapor barrier membrane.
Posi-ties are fastened through the 4 x 8 shiplap insulation boards; the neoprene washer seals the hole, and is the permanent mechanical attachment of the insulation
Posi-ties can be used on steel studs or block and can accommodate insulation thickness up to 3 in.




View Design G Detail
Thompson & Lichtner Air Tight Testing Design "G"
Carlisle Tech Note Cav-Grip



February 26, 2004

Georgia-Pacific, Dow Chemical and Carlisle Issues Joint Tech Note on Recommendations For Steel Stud Construction


Georgia-Pacific, Dow Chemical and Carlisle have issued a joint tech note on recommendations for building steel stud walls. This recommendation is based on the best practice for eliminating condensation inside a steel stud cavity. This design also meets the new MA energy code, and is our design "A" on this web site.



View Design A

Joint Tech Note



January 5, 2004

DRY JOINT METAL COMPOSITE PANEL SYSTEMS RECOMMENDED WITH WALLS THAT HAVE AIR BARRIER SYSTEMS


We have updated the details for metal panel composite walls with air barriers to clarify the need for open joint systems. Metal panel composite systems are those products like Alucobond panels (ACM) or equal that are either wet seal or dry joint systems. Dry joint rainscreen systems allow for proper ventilation and will not trap condensation or moisture. In Canada where air barriers have been used for over ten years, the dry joint system is what is used.

Prior to the use of air barriers most metal panel wall systems were tested and designed on a joint system that relies on caulk to seal it, also know as wet seal systems. A wet seal metal panel composite system is a vapor barrier and should not be installed in front of an air/vapor barrier system. Wet seal metal panel systems that are vented with weeps can create significant wall problems. A vented wet seal system can actually suck in water and not allow for the proper drainage or drying, resulting in corrosion and mold growth.

Joseph Lstiburek, PhD, P.Eng. of Building Sciences Corporation has written a technical note explaining this in detail (see link below); also provided are a report and photos of tests performed on the panel system.

Dry Joint Metal Panel Detail and Specification



September 10, 2003

Conducting Pre-job Meetings For Air Barrier Systems


We can not stress enough the importance of conducting a pre job meeting to coordinate all the trades that are involved in installing an air barrier system. Over the past 2 years Pace Representatives has been involved in many of these meetings. We have put together a checklist based on our experience that identifies many of the key points, available below. For more information on conducting pre-job meetings please call us 617-342-7072.

Pace Checklist



May 20, 2003

The following are best practice photos and descriptions for installing rigid insulation and brick ties over an air barrier system.

Job:

Souhegan High School, Amherst NH

Architect:

Lavallee Brensinger Professional Association Manchester NH

General Contractor:

Harvey Construction, Bedford NH

Air Barrier Contractor:

Premier Caulking, Londonderry NH

Wall Assembly:

Steel Stud
   
Exterior Sheeting - GP Dens-Glass
Advantages: Moisture resistant (ideal surface for application of an air barrier)
Fiberglass face front and back
Silicone treated core
Additional Recommendation: GP Dens-Armor or Dens-Armor Plus for the Interior finish board
Advantages: Dens-Armor or Dens-Armor Plus mold resistance board per ASTMD-3273
Dens-Armor along with Dens-Glass eliminates paper from the cavity
Air Barrier- Carlisle CCW Barriseal
Advantages: Water based asphalt emulsion, cures to form a flexible monolithic air/vapor barrier system
Single source responsibility. Carlisle offers complete line of air/vapor barrier and waterproofing systems:

Carlisle CCW Barriseal roll or spray grade air/vapor systems
Carlisle CCW 705 40 mil sheet membrane air/vapor barrier
Carlisle CCW thru-wall flashing
Carlisle CCW window and door flashing
Carlisle CCW 801 below grade 60 mil sheet membrane
Carlisle Barricoat below grade spray or roll membrane
Temporary Adhesive For Insulation- Carlisle CCW Cav-Grip
Advantages: Installer can easily attach insulation and do a complete insulation job without looking for studs
Membrane is protected right away from construction damage and UV rays
Insulation-Dow Styrofoam Cavitymate SC 4 x 8 Shiplap
Advantages: Dow extruded polystyrene proven over 50 years to be moisture resistant
Long term stable high R-value
4 x 8 shiplap boards limits joints and enables a total insulation job
CMHC recommends the best way to avoid condensation is to eliminate all insulation from the stud space and only insulate the cavity.
Cavitymate over the air barrier protects the membrane from thermal cycles
Cavitymate shiplap acts as an additional plane against water.
Brick Tie- Heckmann Posi-tie
Advantages: Millions of Posi-ties have been installed in the US since 1985.
Posi-ties have passed zero air and water testing with Carlisle 705 air/vapor barrier membrane.
Posi-ties are fastened through the 4 x 8 shiplap insulation boards; the neoprene washer seals the hole, and is the permanent mechanical attachment of the insulation
Posi-ties can be used on steel studs or block and can accommodate insulation thickness up to 3 in.




View Design A Detail



May 6, 2003

AIA/CES CREDIT


To learn more about moisture management in steel stud assemblies and earn AIA/CES credit at the same time, simply read this excellent four page article at the link below. You will have a better understanding how condensation can affect this type of construction.
Moisture Management in Steel Stud Assemblies

Design A Detail



December 20, 2002

NEW 30 YEAR RE-USE ROOF INSULATION WARRANTY

Dow Chemical has announced the offering of a 30 year re-use roof insulation warranty for their DECKMATE PLUS extruded polystyrene roof insulation. The cost of the warranty is $0.03 per sq foot. Dow Chemical will issue the warranty directly to the building owner. Any single ply roof system is eligible for this coverage, in addition to the warranty that the roof membrane manufacturer offers. It will also be issued on roof systems that incorporate vapor barriers that are now a part of the new MA energy code Chapter 13. This is significant for building owners such as schools, universities, institutions, and other owner occupied buildings. It ensures that the roof insulation, which is the most expensive component of the roof, will be re-usable when it is time to reroof. When looking for a 'GREEN ROOF', re-use makes a lot of sense.

For more information:
Click to view new warranty

Click to view large versions of graphics

Click to view specifications



October 14, 2002

Georgia Pacific introduces DENSARMOR and DENSARMOR PLUS

Georgia Pacific, manufacturers of DENSGLASS GOLD, is changing the way interior walls will be built with the introduction of DENSARMOR and DENSARMOR PLUS interior mold and mildew resistant panels (per ASTM D 3273).

For more information:
DENSARMOR

DENSARMOR PLUS

Georgia Pacific Website



September 5, 2002

Job:

North End Elementary School Fall River MA

Architect:

Mt Vernon Group Stoneham MA

Air Barrier Contractor:

Spillane Waterproofing, Boston MA

General Contractor:

Bacon Construction, East Providence RI
Carlisle Barriseal roll grade is simple to install and a very effective air barrier on block back up. Spillane Waterproofing is rolling on two heavy coats to achieve 40 mil thickness. They prefer roll on air barriers because they can work on small areas of the building at a time. This enables them to keep up with the construction progress. In addition there is no investment in spray equipment and no need to protect the building and the surrounding areas from over spray.

As can be seen from the photos, the block needs to be free of voids and tooled flush, and all the openings and transitions need to be sealed with Carlisle 705 sheet goods.

Click here to view details and specifications.

Click here to learn more about Barriseal.

Click here to learn more about Carlisle 705.

Click here to learn more about Carlisle CAV-GRIP.





July 25, 2002

Job:

Wrentham Elementary School, Wrentham MA

Architect:

Dore and Whittier, South Burlington VT

General Contractor:

Sells Greene Building Contractors, Wrentham MA
Griffolyn T-65 Vapor Barrier is installed on the prepared soil. Griffolyn T-65 is a high density polyethylene with a cord reinforcement. This product resists punctures and tears that can occur during installation, and has a lower permeability than standard 6 mil polyethylene.

Dow 2 inch STYROFOAM extruded polystyrene is being used as the slab insulation. As seen in the photos, the compressive strength of 2 inch STYROFOAM can easily handle the construction traffic. Notice also that the insulation on the inside of the foundation wall is brought to the top of the interior slab to meet the MA code requirement of continuous insulation. The MA requirement of continuous insulation under the slab is to prevent mold from occurring between the slab and floor covering in the summer months.

Click here to view slab insulation and vapor barrier specification.

Click here to learn more about Griffolyn T-65.





June 20, 2002

Daylighting Studies For School And Retail

A study that looks at the effects of daylighting on human performance was recently conducted by Heschong Mahone Group (HMG), a nationally recognized building energy efficiently consulting firm. The study focused on skylighting and daylighting in schools and retail stores. The results in schools found that test scores of students were 7% to 18% higher than those students without natural lighting. For retail, those stores with skylights showed significantly higher sales then those without skylights.

To read the complete study, log on to www.h-m-g.com; go the the site map and click on "Daylighting Productivity Study."

For more information on skylights, here or click on the WASCO logo.



May 20, 2002

Canada Mortgage Housing Corporation (CMHC) 1990 Case Study

The CMHC studied a brick veneer steel stud wall assembly built in 1990, and the results can be found on their website, where they discusss "Performance of a Brick Veneer/Steel Stud Wall System". The wall assembly was made up of: brick veneer/ air space/ building paper/ gypsum/ steel stud/ batt insulation/ polyethylene vapor barrier/ interior gypsum. The findings show mold and moisture in the wall system will occur with this type of system.

To correct these problems the CMHC recommends Design "A" which can be found on the link below.

System A:
Cavity wall construction with rigid insulation (equal to R-19 batt) and sheathing, no insulation in stud cavity.



May 7, 2002

Job:

University of Massachusetts Dartmouth Campus

Architect:

Cannon, Boston MA

Air Barrier Consultant:

Thompson & Lichtner Company, Inc., Cambridge MA

Air Barrier Contractor:

Premier Caulking, Londonderry NH
The new dorms now under construction at the University of Massachusetts Dartmouth Campus are incorporating Design "G" as the air barrier wall system.

Design "G" is Barriseal from Carlisle, a liquid applied air barrier that can be sprayed or rolled on the substrate. Block back-up walls are the ideal surface for liquid systems. Openings are sealed with Carlisle 705, 40 mil sheet membrane and mastic, and then over-sprayed with Barriseal. Barriseal is sprayed on either 40 mil, 60 mil or thicker, depending on the job requirements.

To view details and specifications of Design "G", go to the wall section of our web site, or click on the link below.

Click here to view details and specifications.

Click here to learn more about Barriseal.

Click here to learn more about Carlisle CAV-GRIP.

Click here to view a six-slide presentation on how to use Barriseal.





For steel studs and DENS-GLASS, Design "A" has proven to be the most economical and effective way to build an air barrier into this wall type. Design "A" incorporates Carlisle 705, 40 mil peel and stick membrane over DENS-GLASS. Incorporating a brick tie such as Posi-tie allows the use of 4x8 shiplap extruded polystyrene Dow Cavitymate STYROFOAM. The brick tie self-seals as it goes through the Carlisle 705 and becomes the permanent attachment for the insulation as well as the brick. Utilizing a 4x8 shiplap board helps eliminate thermal bridges, which is a requirement in the MA Energy Code Section 1302.0, Definitions of Continuous Insulation. In the field the air barrier installers have been using Glass-Grip from Carlisle to adhere the insulation to the membrane. This is being done immediately after the membrane is installed, so it can be protected from construction site damage. To view a job profile of this, please refer to the Tufts Jaharis Center news item, below, dated September 21, 2001.

For details and specifications please click the link below or go the wall section of our web site.

Click here to learn more.



March 5, 2002

Job:
Architect:
Contractor:

St Mary's Parish Center, Scituate, MA
Donahue Associates, Quincy, MA
Suffolk Construction, Boston, MA
Now under construction, St Mary's Parish Center, Scituate MA is incorporating an asphalt shingle roof system that meets the new MA energy code. Details and specifications of this type of roof construction can be found on our web site under roofing, or on the MA State Building and Regulations and Standards site. The roof construction is composed of a plywood deck, with Carlisle 705 air and vapor barrier covering the plywood, and tying into the exterior wall. The insulation is vented Extruded Polystyrene STYRO-VENT with groves on the surface every 3/4" to allow air movement. Because the STYRO-VENT is grooved, it allows the plywood or OSB board to be placed over the insulation and fastened down in any pattern. The OSB board or plywood is fully supported over the STYRO-VENT. Other vented roof insulation boards relay on nailing strips between the insulation and the plywood, and missed fastening causes waving of the plywood or OSB board. Over time the plywood or OSB board can even sag between the nailing strips. These conditions are eliminated with grooved STYRO-VENT. The roof system is then finished with plywood, felt paper and asphalt shingles, and is vented at the eves and ridges.
Click here to learn more.

Click here to view/download a STYRO-VENT tech sheet.






January 9, 2002

NEW Dens-Glass Ultra Shaftliner
Dens-Glass Ultra Shaftliner is a revolutionary gypsum product engineered to solve problems in shaftwall and separation wall applications. Building on Dens-Glass Gold technology, Dens-Glass Ultra Shaftliner is highly moisture resistant as well as resistant to mold and mildew as tested according to ASTM D 3273.

Dens-Glass Ultra Shaftliner has been tested and approved in a wide variety of shaftwall, stairwell, and separation wall systems. It is intended to be used with C-T, I and H stud systems. Dens-Glass Ultra Shaftliner is currently available throughout North America.

Click here to learn more.




November 7, 2001

Reference:
Subject:

MA energy code chapter 13
Roofing
Gale Associates Inc. building envelope consultants, are now constructing their new corporate headquarters building in Weymouth, MA.. Jon Lindberg, P.E., RRC Principal of Gale Associates Inc., designed a single ply roof assembly that incorporates both extruded polystyrene Dow Deck-Mate insulation, and a cover board GP Dens-Deck Primed for their headquarters building. Mr. Lindberg recommends extruded polystyrene roof insulation for the following reasons:
  1. It has superior resistance to moisture over any other roof insulation.
  2. Stable R-Value
  3. Reusability in the future when reroofing is required
He feels it is particularly important now to use extruded polystyrene in a roof assembly with the new MA energy code chapter 13 requirement of a vapor retarder on the deck. Roof assemblies with vapor retarders can trap moisture should leaks occur. Foam roof insulations such as Poly Iso have a very poor resistance to moisture. The closed cell nature of extruded polystyrene enables the insulation to stay dry when moisture becomes trapped in roof systems.

Three years ago the National Roofing Contractors Association (NRCA) recommended the use of cover boards in roof assemblies. Mr. Lindberg and Gale Associates Inc. have been specifying cover boards for over 25 years. GP Dens-Deck Primed has become their choice for cover boards under reflective or light colored membranes because:
  1. It has a high impact surface, and withstands roof traffic that otherwise could lead to underlayment deterioration and roof delamination.
  2. No other cover board has the moisture resistance properties of Den-Deck.
  3. Dens-Deck Primed requires less adhesive in fully adhered single ply roofs.
Details for this roof assembly can be found on our website in the roofing section entitle Single Ply Roofs.

As always I welcome your comments.

Keith Sportack
ksportack@pacerepresentatives.com




September 21, 2001

Job: Tufts University Jaharis Center, Boston, MA
Architect: Architectural Resources, Cambridge, MA
General Contractor: Suffolk Construction, Boston, MA
Mason: Commercial Masonry
Wall System: Design A
The design "A" wall system is based on the Canada Mortgage and Housing Corporation best practice guide "Building Technology Brick Veneer Steel Stud". Canada's building code is similar to MA's new energy code that requires both air barriers and ridged insulation over steel studs. This wall section includes the following:

Interior gypsum board
No vapor barrier
Steel stud, no fiberglass in the stud spacing
Exterior gypsum sheathing
Air barrier/ vapor barrier peel and stick Carlisle 705
1.5" Extruded Polystyrene insulation Dow Styrofoam Cavity-Mate 4 x 8
Brick tie, air tight Heckmann Pos-i-tie
The Canada Mortgage and Housing Corporation recommendations:

"Keep studs above the dew point temperature of the interior air, since small amounts of air leakage are difficult to prevent, yet can transport enough moisture to cause significant corrosion. The best way to avoid condensation is to eliminate all insulation from the stud space and insulate only the cavity".
 


Job: Lexigen Pharmaceuticals, Bedford, MA
Architect: Ellenzweig Associates Architects, Cambridge, MA
General Contractor: Linbeck / Kennedy & Rossi Construction, Lexington, MA
Wall System: Design A
The design "A" wall system is based on the Canada Mortgage and Housing Corporation best practice guide "Building Technology Brick Veneer Steel Stud". Canada's building code is similar to MA's new energy code that requires both air barriers and ridged insulation over steel studs. This wall section includes the following:

Interior gypsum board
No vapor barrier
Steel stud, no fiberglass in the stud spacing
Exterior gypsum sheathing GP Dens-Glass Gold
Air barrier/ vapor barrier peel and stick Carlisle 705
2.5" Extruded Polystyrene insulation Dow Styrofoam Cavity-Mate 4 x 8
Brick tie, air tight Heckmann Pos-i-tie
The Canada Mortgage and Housing Corporation recommendations:

"Keep studs above the dew point temperature of the interior air, since small amounts of air leakage are difficult to prevent, yet can transport enough moisture to cause significant corrosion. The best way to avoid condensation is to eliminate all insulation from the stud space and insulate only the cavity".
 




August 7, 2001

Job: World Trade Center Boston
Architect: Kallmann McKinnell and Wood
General Contractor: Turner
Waterproofing Contractor: Chapman Waterproofing
Dens-Glass by Georgia Pacific was chosen as the substrate for the air and water barrier (Carlisle 705) on the World Trade Center. Dens-Glass combines an inorganic glass mat facing with a water resistant silicone treated gypsum core. This enables the board to stay dry during the construction process, and allows the air barrier membrane, or air barrier tape to be applied anytime. Regular paper face gypsum sheeting does get wet during the construction process and air barrier membranes and tape cannot be applied until the sheeting is dry. This is one reason why Dens-Glass is the best choice for sheeting exterior surfaces that are going to be covered with air barrier membrane or tape.
Carlisle 705 was selected as the air and water barrier over Dens-Glass sheeting. This product is a 40ml peel and stick membrane that adheres well to Dens-Glass when primed according to Carlisle’s recommendations.


Job: Stillings Street Boston
Architect: Jung Brannen Associates, Inc.
General Contractor: Turner
Waterproofing Contractor: Chapman Waterproofing
Dens-Glass by Georgia Pacific was chosen as the substrate for the air and water barrier (Carlisle 705) on Stillings Street office building. Dens-Glass combines an inorganic glass mat facing with a water resistant silicone treated gypsum core. This enables the board to stay dry during the construction process, and allows the air barrier membrane, or air barrier tape to be applied anytime. Regular paper face gypsum sheeting does get wet during the construction process and air barrier membranes and tape cannot be applied until the sheeting is dry. This is one reason why Dens-Glass is the best choice for sheeting exterior surfaces that are going to be covered with air barrier membrane or tape.
Carlisle 705 was selected as the air and water barrier over Dens-Glass sheeting. This product is a 40ml peel and stick membrane that adheres well to Dens-Glass when primed according to Carlisle’s recommendations.




June 26, 2001

STYROFOAM CAVITYMATE SC has New Shiplap Edge, and comes in 4 ft. by 8 ft. boards for use with Heckman Pos-I-Tie Brick Ties!

STYROFOAM CAVITYMATE brand extruded polystyrene insulation has been proven to provide superior R-value in the harsh, wet cavity wall environment. Now it's even better. With a new shiplap edge and new 4' x 8' board size, STYROFOAM CAVITYMATE SC brand extruded polystyrene insulation offers even greater protection for steel stud cavity walls. Read the Brochure or View the Specification.



April 28, 2001

The new Basketball Hall of Fame in Springfield MA, is beginning to take shape. The prominent feature of the building is a large sphere which will be clad with VERCERAM. This cladding material is a composite ceramic and can be glazed into a curtain wall system, or used as a full panel system with a metal stud backup. It can emulate metal, precast, stone, terracotta, or even a basketball, as it is being used on this project. VERCERAM can be what ever you want it to be! To view the progress of the project click on newhoophall.com.