Knee Wall Spray Foam Insulation In Kitchener, Ontario

Wartime Houses Have Almost No Eave

The St. Mary's wartime houses, and many older homes downtown, have steep roofs with little or no eave overhang. Upstairs rooms sit right under the roof, with short knee walls and sloped ceilings. There is very little depth in those slopes, and whatever was put in years ago has often slumped or gone missing.

In a shallow slope, knee wall spray foam insulation fits the most R-value into the least depth. Closed cell does there what thick batts cannot.

Knee Wall Spray Foam Insulation Must Cover The Floor Behind

Behind each knee wall is a strip of floor sitting over the heated room below. If that strip is open to the cold space, warm air slides under the knee wall and out through the roof. That is why sealing only the knee wall often falls short.

We seal the floor joists behind the wall, or we move the foam up to the roof slope so the space behind the knee wall becomes warm.

Reaching Tight Spots For Knee Wall Spray Foam Insulation

Most knee wall spaces are reached through a small door or a hatch we cut and trim. We bring short hoses and compact gear for tight spots, and we cover the room before starting. Wiring, old vent chutes and any loose boards in the space get checked before the first pass.

Knee Wall Spray Foam Insulation Pricing

Knee walls and sloped ceilings are priced like attic work, at about $2.50 to $4.50 a square foot for open cell and $3.50 to $7 for closed cell. Tight access adds time, and the quote shows it.