R30 Vs R38 Attic Insulation

Wall insulation whenever exterior siding is removed on an.

R30 vs r38 attic insulation.

Add insulation to attic. 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. The basement is finished and crawlspace insulated. The attic has about r30 insulation.

That doesn t mean all those higher levels of insulation are cost effective though. You ve got to do the calculations to find where your optimum is. Existing 3 4 inches of 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. 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. 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. Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy.

Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Installing additional insulation from r 30 to r 38 not so much. That may sound odd but it s true.

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