4.1301.11 Pier Construction Subfloor Insulation—Batt Installation with Rigid Barrier

Topic: 
Floors
Subtopic: 
Accessible Floors
Desired Outcome: 
Maintain a consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between conditioned and unconditioned space to prescribed R-value of an adjoining insulated assembly
TitleSpecification(s)Objective(s)
4.1301.11a
Subfloor preparation

Sealing between conditioned space and crawl space will be completed before insulating work begins

Ensure airtight envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Prevent leakage

4.1301.11b
Installation

Insulation will be cut as necessary to fit between the floor joists and installed in contact with subfloor without gaps, voids, compressions, misalignments, or wind intrusions

If Kraft-faced batts are used, they will be installed with Kraft facing to subfloor

Insulation will be installed to prescribed R-value

Insulate to prescribed R-value

4.1301.11c
Secure batts

Batts will be secured with physical fasteners

Ensure insulation remains in contact with subfloor

4.1301.11d
Rigid 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

A rigid 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 will be mechanically fastened to underside of floor assembly

Seams and penetrations will be sealed

Rigid barrier will be resistant to pests

At minimum, all gaps larger than 1/4" x 1/4" will be stuffed with copper metal mesh or other rodent-proof material

If rodents can easily get their mouth around corners, they will be reinforced with hardware cloth or metal angle (e.g., gypsum board bead)

Protect insulation

4.1301.11e
Building operations staff education

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