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.