How Thick Insulation For Concrete Floor

Thicknesses of dpms vary but 1 200 gauge is a common thickness.

How thick insulation for concrete floor.

The plastic serves as a vapor barrier preventing moisture from passing up through the gravel to the concrete floor above. Not a finished surface you will need to lay a chipboard layer over the insulation boards adding to the height. A 50mm thick layer of proprietary floor slab insulation is usually enough to reach and maintain the target u value but this should be checked with an architect first. Namely if you are only digging the slab you will need to take into account the thickness of the insulation since it will affect the depth of the slab.

In cold climates it is advisable to use a minimum of 2 inches of extruded polystyrene under the slab. Designers generally insulate both directly under the slab and around the perimeter as well. Why is this the case. Many increase the under slab insulating foam board thickness to 3 or 4 inches at the outer 2 to 4 feet of the slab.

Step 4 place 2 inch thick pieces of rigid styrofoam insulation on top of the plastic sheeting. Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available. It s the old pareto 80 20 rule with concrete floors. Thickness many types of insulation board are at least 50mm thick raising the level of the floor.

There are two main reasons that i know of. It is preferable to cover the area being worked on with just one large sheet but in cases where more than one sheet is required joins should overlap by at least 150mm and be sealed to prevent any moisture coming up through the new concrete slab. 80 of the heat is lost through 20 of the total surface. The first important thing to pay intention to is the depth of the floor slab.

Room alterations you will need to think about raising skirting boards trimming doors and maybe moving sockets. Place the insulation edge to edge using duct or other construction tape to hold the insulation together. The math is pretty simple the thicker the concrete floor insulation material the deeper the slab will have.