Best Way To Insulate An Attic Knee Wall

Cellulose is much better suited for the attic flat. The first point is sealing the soffit venting.

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As you correctly guessed you need to have a durable air barrier on both sides of any wall insulated with fiberglass batts.

Best way to insulate an attic knee wall. If you dont currently see any signs of moisture accumulation mold or rot there is no need to worry. Obviously youre going to have to get into the attic to insulate the knee wall. If you plan to insulate the roof deck of your attic then you would use spray foam or fiberglass batts.

Get your protective clothing dust mask and goggles and grab a light and climb on in there. If the studs are covered on the attic side you can insulate the knee wall by drilling a hole in the covering near the top of the wall and filling the cavity with blown insulation. In this case after insulating the stud cavities with fiberglass batts use 1-inch minimum rigid foam insulation to cover the back of the knee wall which will prevent attic air from circulating around and through the.

The air barrier should have no leaks especially in the areas where the floor meets the wall and the wall meets the roof. One of the best methods is rigid foam board with sealed joints over insulation in the knee wall. In this case the area behind the knee wall will be uncomfortably hot or cold.

The biggest challenge here is that the kneewall space creates a complicated shape that is difficult to air-seal. Assuming styrofoam vent chutes are installed rough cut a foam block to fit between the rafters. 6 Insert each strip of faced insulation between the studs.

Dont worry about ventilation in the triangular attic behind the kneewall. If only the living space will be insulated wrap the insulation around the rooms walls and ceiling and then continue along the floor of the non-living space. One option when insulating from the inside is to treat the crawlspaces behind kneewalls as unconditioned space.

Here is a link to an article that tells you everything you need to know. How to Seal Knee Wall Doors. There are two basic ways to insulate a finished attic.

If you choose to insulate along the horizontal and vertical walls you have four key air sealing points. Once the insulation is added to the cavity it is very important to complete the air seal on the attic side. A wide variety of materials can be used including rigid foam with taped seams drywall with taped seams OSB with taped seams or carefully installed housewrap.

Air-seal and insulate the kneewall If you plan to insulate a kneewall and the attic floor behind the kneewall protect the insulation with an adjacent air barrier. If you cant get at the underside of the rafters or if creating a continuous air barrier would be impractical for example with truss roof framing then youll need to insulate the knee wall itself. Face the knee wall with the appropriate size of drywall.

This is not very easy in most of the older houses we work on because the hatches and attics are too small to get rigid foam board through. Use a utility knife to cut strips of faced batt insulation 1 inch longer than the height of the knee wall to create a snug fit in the wall. Two Ways to Insulate Attic Kneewalls 1.

I was thinking about doing it in this order 1 taking the knee wall drywall down 2 installing blocking between joists with wood or foam board to create an air seal 3 insulating and air sealing the ceiling of the lower floor to up to the joist blocking 4 using furring strips on the backside of the knee wall to hold the insulation in place since getting sheathing back there would be nearly impossible 5 installing new insulation. Many knee wall doors have built-in weather-stripping and insulation. For our uninformed readers a knee wall is located in a area of the home with attic space behind it.

Push the knee wall firmly into place. Depending on your experience with construction insulation and especially attic insulationairflow a homemade cover box is unlikely to provide the same amount of benefit as an approved purpose-built attic cover. The ceiling and knee wall drywall will act as your air barrier.

The best materials for the attic and thus the knee wall are spray foam fiberglass and cellulose. There are as many ways to do it as there are people who do it. Nail down the sole plate the bottom of the wall in three or four places into the attic floor.

Do the same thing for the angled top of your knee wall nailing it into the rafters in three or four places.

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