Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance.
R value concrete walls.
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.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
The table below shows what levels of insulation are cost effective for different climates and locations in the home.
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.
Typical residential weight concrete 8 wall r 2 5.
Depending on the density of the blocks an 8 inch thick block wall without any other type of.
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.
0 13 0 64 30.
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 block wall with air in cavities r 2 0.
This refers to insulation uninterrupted by furring or by the webs of concrete masonry units.
The higher the r value the better the thermal performance of the insulation.
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 sand gravel aggregate.
By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.
Above grade concrete wall including inside and outside air films r 1 2 for 6 inch r1 4 for 8 inch.
The iecc prescriptive r value table calls for continuous insulation on concrete masonry and other mass walls.