4.1003.13 Roof Decks (Underside of Deck—Attic Space Ceilings)—Spray Polyurethane Foam Vented Roof Decks 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 Referenced Standards.
TitleSpecification(s)Objective(s)
4.1003.13a
Installation

Insulation will be installed to prescribed R-value in accordance with manufacturer specifications

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

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

Where rigid foam plastics are used, in no case will the final thickness exceed the manufacturer's tested thickness used to determine the maximum 75 flame spread and 450 smoke-developed index when tested to ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723

Foam will be provided with ignition and thermal boundaries, as required by code

Unneeded attic ventilation openings will be covered with a substrate and then covered with SPF SPF Spray polyurethane foam

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

Minimize framing cavity air flow

Minimize moisture migration and unwanted condensation in insulation (vapor retarders)

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

4.1003.13b
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

    4.1003.13c
    Building operations staff education

    Documentation of material and R-value will be provided to building operations staff

    Provide occupant with documentation of installation