R30 Vs R38 Attic Insulation

The results of the blower door test are not.

R30 vs r38 attic insulation.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy. 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. Installing additional insulation from r 30 to r 38 not so much.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. That doesn t mean all those higher levels of insulation are cost effective though. Enter your data into the fields where indicated. Add insulation to attic.

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. Wall insulation whenever exterior siding is removed on an. The attic has about r30 insulation. The basement is finished and crawlspace insulated.

The material cost is minimal compared to the fixed costs of the contractor to do either or your time to pickup a blower and material. Existing 3 4 inches of insulation. That may sound odd but it s true. An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer.

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.