Rigid Foam Insulation Concrete Slab

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Rigid foam insulation concrete slab.

Rigid foam insulation also known as insulating boards provide high r values. There are several ways to install subflooring above the rigid foam. Eps 3 xps 2 faced or unfaced. The usual solution is to bevel the top of the foam so that concrete will then cover the bevel.

For under slab applications the rigid foam insulation typically should be installed over a gravel base with a poly vapor diffusion retarder between the gravel and insulation. Exterior rigid foam insulation at the edge of slab. A common design assumption leads to specification of rigid foam strengths that are many orders of magnitude higher than necessary which can double the insulation material cost. You can use either one or two layers of plywood or osb and the subflooring can either be fastened to the concrete with long tapcon screws or it can simply float above the foam.

Or as demonstrated here you can cover the slab with rigid foam insulation add two layers of plywood and then add the finish flooring. If the top of the vertical rigid foam installed at the slab perimeter is visible on the interior of the house it can be hard to install flooring. If your basement slab lacks sub slab foam you ll have to install the insulation above the slab. R 7 7 rigid foam insulation model 310891 18 35 18 35.

Bevel the foam. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. Building additions that include a slab on grade construction also are subject to the slab edge requirements listed in the iecc irc. They keep your home at a comfortable temperature without the need to crank your heat.

Rigid insulation is one of the best tools to reduce your energy costs. There are two ways to handle insulating concrete floors. For installation on concrete foundations and under floor slabs the rigid foam insulation you choose can make a difference of tens of thousands of dollars on a project. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.

You can even place it under the foundation slab. You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring. Install it anywhere from the roof to the foundation. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs.