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InternationalTable I – Walls Containing STYROFOAM™ XPS Insulation
| Wall Component | Materials |
| Base wall system – Use either 1, 2 or 3 | 1 – Concrete wall
2 – Concrete Masonry wall 3 – 1 layer – 5/8-inch thick, Type X, Gypsum wallboard on interior, installed over steel studs: minimum 3 5/8-inch depth, minimum 20-gauge at a maximum of 16-inch OC with lateral bracing every 4 ft. vertically |
| Floorline Firestopping | 4 lb/cu ft. mineral wool (e.g. Thermafiber) in each stud cavity and at each floorline – attached with Z-clips or equivalent |
| Cavity Insulation – Use either 1, 2 or 3 | 1 – None
2 – Fiberglass batt insulation (faced or unfaced) 3 – Any noncombustible insulation (faced or unfaced) |
| Exterior sheathing – Use either 1, 2 or 3 | 1- None
2 – 1/2-inch thick, exterior type gypsum sheathing 3 – 5/8-inch thick, Type X, exterior type gypsum sheathing |
| Weather-resistive barrier applied to gypsum sheathing – Use either 1 or 2 | 1 – None
2 – AIR-SHIELD LMP (Gray) AIR-SHIELD LMP (Black) AIR-SHIELD TMP AIR-SHIELD LSR |
| Exterior insulation | 1 – STYROFOAM™ Type IV or Type X per ASTM C578 – Total thickness to be a minimum of 1/2 inch to maximum of 3 inches when installed using Special Conditions. |
| Sealing of exterior insulation | Optional, seal all exterior insulation joints and as option veneer tie penetrations with either:
a) Dow LIQUIDARMOR™ – CM Flashing and sealant – max. 60-mil wet thickness, max. 5-inch width b) Acrylic, asphalt or butyl-based sealing tape – max. 4-inch width |
| Weather-resistive barrier applied to exterior insulation Use either 1 or 2 | 1- None
2 – Any shown in Table II |
| Exterior Veneer – Use either 1, 2, 3, 4 or 5 | 1 – Brick – Standard nominal 4-inch thick, clay brick. Brick veneer anchors – standard types – installed maximum 24 inches OC vertically on each stud. Maximum 2-inch air gap between exterior insulation and brick
2 – Concrete – 2 inches thick or greater. Maximum 2-inch air gap between exterior insulation and concrete. Any standard non-open-joint installation technique can be used 3 – Concrete masonry units – 4 inches thick or greater. Maximum 2-inch air gap between exterior insulation and CMU 4- Stone Veneer – Minimum 2-inch thick, Limestone or natural stone veneer or minimum 1-1/2 inch thick cast artificial stone veneer. Any standard non- open-joint installation technique such as shiplap, etc., can be used 5- Terracotta cladding – Use any terracotta cladding system in which terracotta is minimum 1-1/4 inch thick. Any non-open-joint installation technique such as shiplap, etc., can be used |
| Flashing of window, door and other exterior wall penetrations | As an option, flash window, door and other exterior penetrations with either:
|
Table II – Allowed Weather-resistive Barriers
| Installed Over Foam Insulation |
| Dow Chemical –
• WeatherMate™ • WeatherMate™ Plus |
| DuPont –
• Tyvek® CommercialWrap® •DuPont™ Tyvek® CommercialWrap® •DuPont™ Tyvek® CommercialWrap® D •DuPont™ Tyvek® ThermaWrap™ |
| Pactiv –
• Green Guard®Max Building Wrap |
| VaporShield –
• RevealShield™ •RevealShield SA™ |
Note: all barriers to be installed at indicated or recommended application rates and per manufacturer’s installation instructions.
Engineering evaluation by Hughes Associates
Analysis and Extension of NFPA 285 Tests – STYROFOAM™ XPS Project #1JJB05306.011
Southwest Research Institute, Final Report No. 01.06440.01.001, dated May 2003
Underwriters Laboratories, Inc. Final Report 05CA2541, NC2650, dated January 10, 2005
Southwest Research Institute, Final Report No. 01.13537.01.106, dated September 26, 2008
Full NFPA testing documents are available. Please contact us to request these documents.
2022-06