4.1104.3 Fiberglass Blown Insulation Installation (via Penetrations Through or Behind the Siding)

Topic: 
Walls
Subtopic: 
Manufactured Housing Wall Insulation
Desired Outcome: 
Consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow 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 between the conditioned space and unconditioned space
TitleSpecification(s)Objective(s)
4.1104.3a
Access wall cavities

With T-111, OSB, or plywood type siding:

  • Access to exterior wall cavities will be gained and sheathing will be drilled as needed and probed to locate each cavity, wall studs, and blockers
  • Drilled holes will be large enough to accommodate an appropriately sized fill tube
  • Holes will be drilled around the perimeter of the home, parallel to the bottom plate and an equal distance apart
  • The line of holes will be located under the lowest window sill when possible

With lap siding:

  • Course of siding will be unhooked or removed
  • Holes sufficiently large for the fill tube will be drilled in every wall cavity

Gain access to the wall cavity

Ensure holes are easily covered with an aesthetically pleasing trim strip

4.1104.3b
Exterior wall cavity inspection

Installer prework assessment will be conducted to determine:

  • Moisture damage
  • Presence of infestation or pests
  • Location and integrity of wiring
  • Holes to the interior and exterior
  • Loose paneling or siding
  • Location of belt rails
  • Location of wall obstructions (switches, outlets)
  • Existing insulation
  • Wall hangings for removal during work

Problems will be corrected before work begins

Prepare wall cavity for insulation

Prevent water leaks

4.1104.3c
Blowing machine set up

Blowing machine pressure test will be performed with air on full, feed off, and gate closed

Hose outlet pressure will be set in accordance with manufacturer specifications

Ensure machine is capable of delivering uniform insulation density and coverage

4.1104.3d
Fiberglass blown insulation installation

Flame spread and smoke-developed index for insulation will meet a flame spread rating of 25 or less and a smoke development rating of 450 or less when tested in accordance with ASTM ASTM ASTM International, www.astm.org E84

Insulation will be installed to a density of 1.5 to 1.6 pounds per cubic foot

Using fill tube, 100% of each cavity will be filled to a consistent density

Fill tube will be inserted within 6" of the top of the cavity between the interior paneling and any existing insulation

Fill entire wall cavity to the prescribed R-value to reduce air infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope

Avoid clogging of the cavity and the fill tube

Fire safety will be maintained

4.1104.3e
Plug and seal holes

Holes will be plugged and sealed

Ensure the integrity of the drainage plane

4.1104.3f
Final wall assembly

For T-111 and equivalent siding:

  • A preprimed trim will be centered and installed over the holes
  • Height of the trim will span from 1" above to 1" below the hole
  • A continuous caulk seal will be applied between the trim and siding
  • Caulk seal will be above the holes
  • Top edge of the trim will be sealed to the siding with a continuous caulk seal

For lap siding:

  • Siding will be reattached without bulges or wrinkles
  • Siding will be hooked into the original position

Ensure the integrity of the drainage plane

Return siding to existing conditions without damage

4.1104.3g
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