R Value Of 8 Concrete Wall
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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.
R value of 8 concrete wall. Concrete block makes a cost effective and structurally sound wall but it has. R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90 urea terpolymer foam 4 48. 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. Block thickness in inches.
Concrete block walls u values r values. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The r values u factors listed in this tek were determined by calculation using the code recognized series parallel also called isothermal planes calculation method refs. Concrete block wall with air in cavities r 2 0.
The insulation may be poured directly into walls or emptied into a simply wood or metal hopper which can be slid along the wall to direct the free flowing perlite into cores of cavities thus insulating all voids and air pockets. R values for concrete masonry walls exposed both sides density r value increase problock 85 pcf 10 69 226 problock 105 pcf 8 27 152 traditional 3 web nw cmu 130 pcf 3 28 0 problock 85 pcf 18 14 264 problock 105 pcf 13 94 179 traditional 3 web nw cmu 130 pcf 4 99 0. R values u values coverage charts. 0 13 0 64 30.
Concrete block wall with perlite in cavities r 2 9. 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. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref.
The reason that it is important to make a good estimate for the current r value for uninsulated spaces is that small changes in r values result in large changes in heat loss when the total r value is low. Typical residential weight concrete 8 wall r 2 5. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. As we said before the r value measures the thermal resistance of a material.
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