My new house (well new to me) has blown in insulation. How deep should that isulation be to equal r-25 or r- 40.
Thanks for your advice!!
Usually we go equal to the 2x6 like the other said its around R-25, if you need to go there later you really want to see your 2x6 to walk on, make sure you don't block your soffit vents when putting new insulation or you will have problems with season changing, oh ya make sure you also have a vapour barrier on the heating side of your selling,
If your home was built within the last 10 years, then it should be at R-40 (about 10-11 inches of cellulose fibre, more than 12 inches if it is blown fibreglass).
You could check with your builder to what level it was blown to or look for some identifying info near your electrical panel. 2012 Ontario Building Code is now R-50.
For R-40 an average is 12". BUT, keep in mind that the fluffy stuff does settle and the measurement may provide a false reading. Best to call you local building inspector (County or City can provide details) and see about codes. I also recently heard that the "new" norm os R 50 for attics in cooler climates.
Ya brent is right 2x6 + your trust 2x4 =10 to 11 in. sorry for not explaining myself right but brent said it the right way, I wanted to answer your question (How deep should that insulation be to equal R25 or R40) for R25 its around 6 in, and R40 is around 10 in, of blown insulation, you have all kind of quality (Again Sorry for not explaining myself right)
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