Insulation Under Concrete Roof

State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.

Insulation under concrete roof.

The foil within the product acts to spread out the heat signature of the heating coils. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Finally some contractors in cold climates began installing a continuous horizontal layer of rigid foam insulation under their concrete slabs. Infrastop 48 x 125 under concrete slab reflective layered bubble foil insulation 140 00 as low as.

There are also provisions for fire classification weather protection re roofing roof drainage and solar power. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Eps is used under roofing over foundation walls and beneath siding. The concrete deck can offer greater speed of roof construction which is an important consideration on many larger commercial projects.

Eventually polyethylene was invented. Creating a void between the old ceiling and new is better but ideally you need to eventually consider insulating the top of the concrete roof with solid insulation and a better covering grp or epdm. To insulate a flat roof with a concrete deck we recommend a warm deck construction method where the vapour control layer is sandwiched between the concrete deck and a layer of rigid pir insulation boards. Roof ceiling insulation insulation in roof ceiling constructions must be placed in direct contact with the infiltration barrier.

Concrete contractors learned that a layer of poly helps to keep a slab dry because it stops upward vapor diffusion from the soil. Minimum insulation r value requirements non residential above roof deck. In most cases the attic is ventilated and the infiltration barrier is the drywall ceiling. California roofing requirements under the california residential code cover everything from what suitable materials to use to requirements for roof coverings to roof insulation.

In this case the insulation must lie directly on top of the ceiling.