R Value Of Concrete Roof Slab

For a very good introductory overview article on r value see r values over at the website of.

R value of concrete roof slab.

This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. 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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.

Exterior walls with siding exterior walls with siding concrete block 8 r value concrete block 8 2 with foam insulated cores 20 with 4 on unisulated stud wall 4 3 with 4 insulated stud wall 14 brick 4 r value with 4 uninsulated stud wall 4. There are many websites on the internet which have imperial building material r value numbers but not so many with metric r value numbers. Eps based claddings directly fixed on timber framing. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

Values below are some of the more common r factors for surfaces found on buildings in the u s. Concrete block 4 inch hollow core. 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. Click here to go to our calculator to understand the real r value of a ceiling system or wall system with gaps in the insulation.

Insulated forms available. See citations at masonry below. It uses the iso thermal planes method the same method as used in nzs4214 2006. For a 6 inch slab r value would be between 0 6 and 1 2.

Remember that a higher r value and a lower u factor both indicate better insulating properties. We would like to show you a description here but the site won t allow us. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. The following table is in metric form.

A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. R value of various materials. As we said before the r value measures the thermal resistance of a material.