R Value Of Concrete Basement Walls

R value is a measure of insulation s ability to resist heat traveling through it. Zones 3 and 4 include the midwest and northern regions requiring r 10 to r 19 values. Based on astm c518 calculation method the door has an r value of up to 11 but using astm c1363 tested operable the same door only have an r value of up to 3 5.

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For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.

R value of concrete basement walls.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. In climate 4c the 2012 irc requires a minimum of r 15 for basement walls assuming that we are talking about continuous rigid foam or spray foam insulation the best approach. The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook. Concrete or concrete block walls have the same r value as a 1 9cm thick particle board.

That s a minimum r value. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. 8 thick concrete slab or foundation wall has an r value of about 1 04 30 while lightweight aggregate filled 8 thick concrete has an r value of about 2 18 30. Generally zones 1 and 2 cover the southern states which suggest no necessary values to r 10 for basement walls.

Insulation level are specified by r value. It s up to you to decide the r value of your insulation. The value of basement insulation in cold climates if you had a 20 x 30 6m x 9m basement with concrete or concrete block walls your heat loss could easily be over 1 million btus per day through the walls. Concrete sand gravel aggregate.

In one step epitome foundation composite walls incorporate r16 5 insulation vapor barrier top plate and stud framing within a 9 high durable basement wall structure. This is a huge difference and essentially comes down to astm c518 being a theoretical maximum based on a steady state thermal test of only a portion of the door panel. 0 13 0 64 30. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.

Typical residential weight concrete 8 wall r 2 5. Extremely northern regions and high elevations are zone 5 requiring r 15 to r 19 values. Depending on the density of the blocks an 8 inch thick block wall without any other type of. You can install more insulation than that if you want to.

Recommended home insulation r values. The higher the r value the better the thermal performance of the insulation.

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