Re: foam attic insulation application
Two things with your current setup that can be easily resolved more economically than spraying foam into the attic.
Originally Posted by mf_111759
First thing is the mention of a dust problem orginating from the attic.
By this I'm getting you mean dust from the attic is an issue within the living space below.
What this says is there are openings between the living space and the attic which freely allows your heat to escape into attic during the colder temps.
Also during the hotter temps. heat is allowed to enter the living space making it more difficult to cool the home.
This would be the first thing to relsove before insulating and make an immediate difference. Air seal all the pentrations to keep heat loss / gain to a minimum and keep the dust out.
Secondly, 5-6 inches of insulation in the attic ?
You barely have an R10 at best which is not nearly enough to do much of anything as far as insulation.for heat transfer.
If you ( after air sealing all penetrations first ) blow in 12 - 18 inches of cellulose into attic , combined with proper venting , would provide you with a very good insulation level and temperature relief for a modest cost --- biggest bang for the buck.
Yes, spray in foam can be applied to the bottom section of the attic instead.
If you like , have 1-1/2 inch spray foam applied between each ceiling joist , then blow in 12 - 18 inches of cellulose. The foam will seal the pentrations and provide some R value---- the cellulose provide the rest of the R value.
The attic venting is also required here.
"" an ounce of perception -- a pound of obscure "