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. 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. Generally zones 1 and 2 cover the southern states which suggest no necessary values to r 10 for basement walls.

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R value of concrete basement walls.

Recommended home insulation r values. Concrete or concrete block walls have the same r value as a 1 9cm thick particle board. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. 0 13 0 64 30.

By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. 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. 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. It s up to you to decide the r value of your insulation.

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. 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. Extremely northern regions and high elevations are zone 5 requiring r 15 to r 19 values. Zones 3 and 4 include the midwest and northern regions requiring r 10 to r 19 values.

That s a minimum r value. 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. Insulation level are specified by r value. The higher the r value the better the thermal performance of the insulation.

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. You can install more insulation than that if you want to. Depending on the density of the blocks an 8 inch thick block wall without any other type of. R value is a measure of insulation s ability to resist heat traveling through it.

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. Concrete sand gravel aggregate.

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