4.1003.6 Vented Roof Deck—Spray Polyurethane Foam Installation

Topic: 
Attics
Subtopic: 
Attic Ceilings
Desired Outcome: 
Reduced heat transfer and air leakage through roof and closed attic sections as well as framing cavities inaccessible to other treatments
For supporting material, see Calculation of the Infiltration Credit, General Information on Spray Polyurethane Foam (SPF), Referenced Standards and Building America Solution Center.
TitleSpecification(s)Objective(s)
4.1003.6a
Installation

Insulation will be installed at the ceiling level to prescribed R-value in accordance with manufacturer specifications

SPF SPF Spray polyurethane foam will be applied to desired thickness, using pass thickness maximum as indicated by manufacturer, onto roof sheathing between rafters or trusses

In colder climates ( IECC IECC International Energy Conservation Code Zones 5-8), SPF SPF Spray polyurethane foam will be installed to a thickness of least Class II vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 or have at least Class II vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 coating or covering in direct contact with the underside of the SPF SPF Spray polyurethane foam

Ensure complete and consistent coverage throughout ceiling plane

Eliminate cracks, gaps, and voids

Ensure alignment of insulation and air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary

4.1003.6b
Onsite documentation

A dated receipt signed by the installer will be provided that includes:

  • Coverage area

  • Thickness

  • R-value
    		•

    Document job completion to contract specifications

    Confirm amount of insulation installed

    Comply with 16 CFR 460.17
    		4.1003.6c
    Occupant education

    Documentation of material and R-value will be provided to occupant

    Provide occupant with documentation of installation