4.1003.5 Unvented 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.

Single-Family Homes

Title	Specification(s)	Objective(s)
4.1003.5a Installation	Insulation will be installed 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 When desired, underside of rafters or trusses will be covered with SPF SPF Spray polyurethane foam to provide layer of continuous insulation Upper vent openings will be covered with SPF SPF Spray polyurethane foam , including ridge, roof, and gable that are covered with a substrate 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 roof plane Eliminate cracks, gaps, and voids Improve structural integrity of roof deck (closed cell SPF SPF Spray polyurethane foam only) 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
4.1003.5b 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
4.1003.5c Occupant education	Documentation of material and R-value will be provided to occupant	Provide occupant with documentation of installation

Title

Specification(s)

Objective(s)

4.1003.5a
Installation

Insulation will be installed 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

When desired, underside of rafters or trusses will be covered with SPF SPF Spray polyurethane foam to provide layer of continuous insulation

Upper vent openings will be covered with SPF SPF Spray polyurethane foam , including ridge, roof, and gable that are covered with a substrate

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 roof plane

Eliminate cracks, gaps, and voids

Improve structural integrity of roof deck (closed cell SPF SPF Spray polyurethane foam only)

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

4.1003.5b
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

4.1003.5c
Occupant education

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

Provide occupant with documentation of installation