MH - Blown Insulation for Flat, Bowed, or Vaulted Ceilings (via Gable End Access)

Detail ID 4.0103.9
Attic Floors - Unconditioned Attics
Desired Outcome

Continuous, contiguous, safe, compliant, and pest-resistant thermal barrier

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing


  • MH
Specification Objective

Verify that installation area is free of:

active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

uncovered electrical junctions

improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

insulation escape openings

Verify that installation area:

is intact, able to support insulation weight, and air sealed

Ensure space can be safely insulated

  • MH
Specification Objective

Select loose fill fiberglass insulation that has a flame spread and smoke development index of 25/450 or less when tested in accordance with ASTM E84 or UL 723

Select fire safe insulation

  • MH
Specification Objective

Create access to attic by removing existing gable vents or installing new gable vents on each gable of the home that are large enough for access to install insulation correctly

Access entire cavity through gable vents

  • MH
Specification Objective

Fill entire attic to prescribed R-value

If existing insulation is roof-mounted, insulation will be blown below

If existing insulation is ceiling-mounted, insulation will be blown above

If existing insulation is mounted at both locations, insulation will be blown in between

Continuous thermal barrier of consistent R-value

  • MH
Specification Objective

Install gable vents using mechanical fasteners ensuring vents are oriented per the manufacturer's specifications

Install gable vents with a pest intrusion screening with a maximum hole size of 1/2"

Weatherproof and pest-resistant gable access closure

  • MH
Specification Objective

Post a dated receipt signed by the installer that minimally includes: Installed insulation type, coverage area, installed thickness, minimum settled thickness, installed R-value, and number of bags installed

Comply with 16 CFR 460.17 and document contract compliance