4.1003.8 Installing Fiberglass Blown Insulation for Flat, Bowed, or Vaulted Ceilings (via Roof Side Lift)

Topic:

Attics

Subtopic:

Attic Ceilings

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

Manufactured Housing

Title	Specification(s)	Objective(s)
4.1003.8a Attic, ceiling, and roof verification	All combustion appliance flues will be terminated to the outdoors and terminations will maintain proper clearance above snow loads A distance no less than 2" will be maintained between any combustion appliance flue and combustible materials, unless zero clearance flue is in place All ventilation systems will maintain a continuous connection and terminate to the outdoors All broken mushroom vents will be replaced or removed and sealed All plumbing stacks will be terminated to the outdoors Non- IC IC Insulation contact rated light fixtures will be replaced with airtight IC IC Insulation contact -rated fixtures All recessed lights will be labeled as having an air leakage rate no more than 2.0 CFM CFM Cubic feet per minute when tested in accordance with ASTM ASTM ASTM International, www.astm.org E 283 at a 75 pascals pressure differential All obvious ceiling penetrations will be sealed The space between combustion appliance flues and the ceiling will be sealed with fire-rated materials All roof, attic, and ceiling assemblies will be structurally sound; loose ceiling panels will be secured Temporary ceiling bracing will be recommended during the insulation installation process Dishing and pooling issues that allow standing water will be addressed All known roof water leaks will be repaired before insulation installation	Ensure occupant and worker safety Verify attic space is ready to insulate Ensure structural integrity of the roof and ceiling assembly Prevent intrusion of bulk moisture Prevent damage during the insulation installation process
4.1003.8b Attic access	Fasteners will be removed from the J channel and the roof edge on the most easily accessible side of the house Roof will be separated from the heel plate and siding roof will be lifted and propped to accommodate fill tube Length of opening will be enough to allow ease of access and reattachment while minimizing potential damage from high winds If subsheathing is present, access will be gained through subsheathing Attic will be visually inspected for the location of existing insulation, obstructions, hazards, and construction type	Create access to the full attic cavity Protect roof from wind damage during installation Ensure ease of roof reattachment Determine insulation installation technique
4.1003.8c 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
4.1003.8d Fiberglass blown insulation installation	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 end of each attic cavity Insulation will be installed into the void of the attic cavity: 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 Avoid overfilling of roof edges and above attic trusses Flame spread and smoke-developed index for insulation will be 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	Fill entire attic 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 Prevent damage to the ceiling Allow roof to be returned to original position Fire safety will be maintained
4.1003.8e Roof reattachment	If existing J channel is damaged, it will be replaced Existing sealant will be removed from the roof edge and J channel At a minimum, new sealant will be reinstalled at the original location Roof and J channel will be fastened to the original location with new screws All seams, edges, and penetrations will be sealed as necessary	Prepare roof edge and J channel for reattachment Reattach roof edge and J channel without leaks
4.1003.8f Verification of details	Installation process will be considered complete when installer has verified that damage has not occurred to the roof or ceiling assemblies during the installation process	Verify the integrity of the house has been maintained
4.1003.8g Onsite documentation	A dated receipt signed by the installer will be provided that includes: • Insulation type • Coverage area • R-value • Installed thickness and minimum settled thickness • Number of bags installed in accordance with manufacturer specifications	Document job completion to contract specifications Confirm amount of insulation installed Ensure ability to match bags required for total area completed Comply with 16 CFR 460.17