R Value Concrete Walls

The higher the r value the better the thermal performance of the insulation. Typical residential weight concrete 8 wall r 2 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.

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R value concrete walls.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch. This refers to insulation uninterrupted by furring or by the webs of concrete masonry units.

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. Concrete block wall with perlite in cavities r 2 9. Concrete block wall with air in cavities r 2 0. 0 13 0 64 30.

By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. 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 and block walls. The iecc prescriptive r value table calls for continuous insulation on concrete masonry and other mass walls.

R value is a measure of insulation s ability to resist heat traveling through it. Depending on the density of the blocks an 8 inch thick block wall without any other type of. R value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00 inch 6 00 extruded polystyrene inch 3 75 1 inch 5 00 1 inch 7 50 foil faced polyisocyanurate inch 5 40 1 inch 7 20 1 inch 10 80 siding materials hardboard inch 0 34. 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.

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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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