I’ve installed urethane foam insulation in a 5000sf house and was very unhappy with the results of the product. Where ever there was a gap in the wall sheathing it expanded to the out side of the house where we had tarpaper covering the wall sheathing it bulged the tarpaper out about 1 1/2”. The list below will list the pros and the cons of urethane foam.
Pro- R-value is 7 for every inch of foam sprayed.
If you need stability in your structure this foam will stiffen up the wall sheathing. (Like when you use built right it’s a little spongy this will stiffen it up.)
You can get a high R-value in small spaces like on older homes where the roof framing meets the exterior walls where the max. Space is only 3” you still get and R-Value 0f 21.
Now the cons
Had to move a door bell wire home owned changed their location what should have been a 1 minute job ended up being 30 minute and this was repeated several times with different change orders.
Using urethane foam in a 3.5”(2×4) wall cavity has same R- value as Icyene Insulation.
In basement energy walls using urethane foam in a 3.5”(2×4) wall cavity has a total lower R- value that of Icyene Insulation. Using urethane the max. spray depth is 3” with a max. R-21 while the basement energy walls are held away from the foundation wall 1/2-2”giving move room for insulation, making Icyene the winner in this location.
Using urethane the max. spray depth is 3” with a max. R-21 while Icyene Insulation has an R-Value of 6.0 and Icyene can be sprayed full depth of the stud cavity. A 6” stud has and R-Value of 5.5 x 6 = 33 R-Valve.
Urethane insulation is a closed cell insulation which means as the foam is being sprayed it creates bubbles. Inside the bubbles are an oil-based gas locked in these billions of bubbles. If or when the walls of the bubbles break down the gasses will migrate out of the stud cavity.