NFPA 285 Wall Basis of Designs

Metal Composite Material (MCM) Cladding with Mineral Fiber Continuous Insulation & Metal Stud Backup

MCM with Semi-Rigid Mineral Wool Insulation and Metal Stud Back-up

2021 IBC, IECC + MA Stretch Energy Code

Revised: August 2025

Featured Manufacturers

Details		Analysis
	SK-01
Specificaitons		Product Information
	Section 070543 - Rainscreen Cladding Attachment System - Rigid Insulatuion	Knight Wall Systems - HCI System
	Section 071300 - Sheet Waterproofing	Henry - MiraDri 860/861 \| WP200
	Section 072100 - Thermal Insulation - Semi-Rigid Mineral Wool	N/A
	Section 072216 - Roof Insulation	DuPont - STYROFOAM Deckmate Plus
	Section 072700 - Air Barriers	Henry - Metal Clad 705FR \| ELBEX - HS222
	Section 074213 - Metal Composite Materal Wall Panels	3A Composites - ALUCOBOND PLUS & AXCENT
	Section 084413 - Glazed Aluminum Curtain Walls	EFCO - 5600X
	Section 085113 - Aluminum Windows	EFCO - 325X
	Short-Form Specificaitons Courtesy of: Kalin Associates

Assembly:

Component	Manufacturer	Product
Interior Finish (vapor permeable)	-	-
Interior Gypsum Board (Type X)	-	-
Metal Stud (18 GA. Min. @16” O.C.)	-	-
Stud Cavity Insulation (Optional)	-	-
Exterior Gypsum Sheathing*	-	-
Self Adhered Air/Water/Vapor Barrier**	Carlisle	705 FR-A
Continuous Insulation	-	3" Mineral Fiber
Cladding Attachment System**	Knight Wall	MFI System
Fabricated MCM Cladding**	3A Composites	Alucobond Plus
* For a 1 hour fire rating change Exterior Gypsum Sheathing to Fire Rated Exterior Gypsum Sheathing. ** Product recommendations are based on Type I-IV construction requiring NFPA 285 assembly acceptance criteria compliance per IBC Section 1403.5.

Assembly Performance:

Clear Wall	Code Minimum (IECC 2015 - Metal Framed)	Proposed
Design R-Value:^a	R-13 + R-7.5ci	R-12.6ci \| R-12.8 + R-12.6ci
Total R-Value:	N/A	R-18.13 \| R-30.93
Effective R-Value:^c	N/A	R-14.43 \| R-22.11
Design U-Factor:^{a, b}	U-0.064	U-0.064 \| U-0.049
Effective U-Factor:^c	N/A	U-0.069 \| U-0.045
Assembly Air Permeability	0.04 cfm/ft² @75Pa	0.0014 cfm/ft² @75Pa
^aClear wall meets energy code thermal requirements without stud cavity insulation. ^bClear wall U-Factor is based on the stud size & spacing noted above and is calculated per IECC 2015 & ASHRAE 90.1-2013 Appendix A. ^cClear wall effective thermal performance is based on the stud size & spacing noted above, manufacturer literature and industry studies on the thermal performance of facades.