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R30 vs r38 attic insulation.
Building new hame same answer.
I am considering whether or not its cost effective to insulate to r50 or r60 for the cost of about 1000 blown cellulose i have had a blower door test performed and will also perform some air leak sealing.
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You ve got to do the calculations to find where your optimum is.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
The attic has about r30 insulation.
Existing 3 4 inches of insulation.
That doesn t mean all those higher levels of insulation are cost effective though.
An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer.
Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy.
The bottom line is that although you can certainly put r 40 insulation under your slab or r 80 insulation in your walls it may not be the smartest thing to do.
That may sound odd but it s true.
Installing additional insulation from r 30 to r 38 not so much.
Add insulation to attic.
Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated wood frame wall 1 r30 to r49 r25 to r30 r13 2 r30 to r60 r25 to r38 r13 to r19 n a 3 r30 to r60 r25 to r38 r19 to r25 and add r5 insulative wall sheathing beneath the new siding 4 r38 to r60 r38 r25 to r30 add r5 insulated sheathing before.
Wall insulation whenever exterior siding is removed on an.
The results of the blower door test are not.