Concrete Floor Insulation Thickness

Multiple uses insulation boards can be laid over both concrete and suspended wooden floors.

Concrete floor insulation thickness.

Concrete slab insulation amount placement vapor barrier placement for solar radiant heated floors what insulation thickness is needed under a passive solar heated slab floor. There will be a damp proof membrane under the insulation and possibly a second membrane on top depending on the type of screed. 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. Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation.

Thickness many types of insulation board are at least 50mm thick raising the level of the floor. A typical way of constructing a solid floor would be to provide a base of hardcore with sand blinding with a layer of concrete over that. This stops any thermal bridging across the walls leading to cold spots. In this scenario a rigid foam insulation is usual and as you d want the same u value in the roof we need the same thickness of insulation 180mm.

Levelling floors a layer of insulation can help to level badly finished concrete floors. Heat loss thermal insulation there are three general types of ground floor construction. R 10 scored squared edge insulation sheathing model 52dd view the owens corning basement and crawlspace insulation. Concrete slab insulation specifications for solar radiant heat floor systems where should floor slab insulation be placed to avoid heat loss.

The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. Insulation is laid on the concrete and covered with a screed. There are two ways to handle insulating concrete floors. The target u value for a concrete ground floor slab is 0 22 and these days the insulation must be provided around the edge of the floor slab as well.

Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available. Where does the vapor barrier go under an insulated heated floor slab. You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring. Or as demonstrated here you can cover the slab with rigid foam insulation add two layers of plywood and then add the finish flooring.

Insulation requirements for slab on grade floors can be found in section r402 2 9 of the 2012 iecc and section n1102 2 9 of the 2012 irc. If the floor is a ground floor provide resistance to. Cons of insulation boards.