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Old 04-03-2019, 01:20 PM   #1
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Insulating with Spray foam can


I have an older home. There is no insulation in the walls. I am trying to insulate one wall in a small room (6ft x 8ft) in the house. The house had plaster walls which is still there. Over the years, someone put small wooden beams (.75 inches thick) on the plaster walls and put drywall. The beams run vertically as well as horizontally. Horizontal beams run every 18 inches from the ground up and vertical runs 14 inches.

Since thereís .75 inches of cavity space, I was thinking of drilling a 1/2 cm whole in the drywall. Then insert the straw for Loctite windows and doors spray foam can and spraying insulation in the small cavity. I would get R-3.4 value from the .75 inches of spray foam.

I was wondering if this application would work.
This is the only wall that isnít attached to the other areas of the house or the next door neighbor wall. I am unsure about insulating the whole house because I have drywall, then plaster and lath wall, then house beams then plywood then granular asphalt shingles siding then another plywood and then the final aluminum siding. Mold formation is another fear I have with insulating with so many layers.
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Old 04-03-2019, 02:12 PM   #2
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Re: Insulating with Spray foam can


Confined space foam injection is tricky business and I have seen a bunch of situations where it goes horribly wrong.



This foam is not intended for this use as it require moisture to cure properly and supposed to be exposed to air to do so.



I would not recommend this.
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Old 04-03-2019, 02:18 PM   #3
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Re: Insulating with Spray foam can


The "beams" are called furring strips. I'm not sure if you mean the horizontals and verticals create a grid or are run in two different directions in two different areas of the wall.
Regardless, what you propose won't work. The foam may expand and inch or two out from the hole until its density will prevent any further expansion and will just come back out the hole. Even if you could get it to work, I my opinion the minimal insulation and savings isn't worth the effort.


Edit: WoW has a good point about proper curing that I hadn't considered.
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Old 04-03-2019, 02:48 PM   #4
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Re: Insulating with Spray foam can


Yes the furring strips create a grid. so each cavity is about 18 inches long x 14 inches wide x .75 inch depth.
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