Insulating Low Pitch Attic

Current air sealing and insulating methods.

Insulating low pitch attic.

Using spray foam insulation in an unvented attic application. Although some builders insulate a low slope roof with the same techniques used for a house with a big attic they should be using a different approach. How to avoid condensation leaks attic mold insulation mold structural damage to roof framing when roof venting is not possible cathedral roof and knee wall insulation venting air path options in older homes hot roof designs. Stuff rafter cavity above the kneewall and blow insulation down the rafter cavity.

The most common practice is to blow in loose fill or wet blown insulation if you are insulating the ceiling where there is a cavity. If it is and you plan to provide heating and cooling to the finished attic space you need to remove. Blow or pour in loose fill between ceiling joists and outer attic rafters behind kneewalls. Multiple jurisdictions have indicated that even though we are utilizing 4 or more of polyiso rigid insulation on the exterior side of the roof sheathing low slope roof the 24 open web parallel chord roof trusses form an attic space and they have been requiring us to vent the low slope application.

Worries about the hot roof un vented cathedral ceiling designs how to. Start with the attic floor. Address air sealing and insulating an existing unconditioned vented low slope attic is to convert the attic into a nonvented conditionedspace whilethisisaviableoptionthatshouldbe considered in a broad discussion on air sealing and insulating homes for this research nonvented roofs were left out of the scope. Because the simplest and cheapest way to insulate an attic is to add material to the floor.

Suggestions for un vented or hard to vent building roof cavities. Stop using your attic for storage. The attic floor which is the ceiling of the living space below often already is insulated. But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.