R Factor Of 10 Concrete Wall

The equation is shown below.

R factor of 10 concrete wall.

2 x 4 wood stud wall 16 o c r 11 batts 1 2 plywood exterior 1 2 gypsum board interior. Block thickness in inches. 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. U 1 r 1 14 2 0 070 btu hr f btu 0 4 w m k note that tables of precalculated r values and u factors including the various insulation and finish systems are available in thermal catalog of concrete masonry assemblies.

The u factor is the heat transfer coefficient which simply means that is is a measure of an assembly s capacity to transfer thermal energy across its thickness. Concrete block walls u values r values. The u factor of an assembly is the reciprocal of the total r value of the assembly. 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.

Typical residential weight concrete 8 wall r 2 5. The corresponding u factor for this wall is. Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

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. 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. U factor equation tables of building material r values. 0 13 0 64 30.

By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Concrete sand gravel aggregate. 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. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other.

Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.