Rigid Foam Insulation Concrete Slab

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. There are two ways to handle insulating concrete floors. There are several ways to install subflooring above the rigid foam.

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A heated slab is a type of construction that has a slab on grade concrete floor with a heating system embedded in or beneath the slab floor.

Rigid foam insulation concrete slab.

Bevel the foam. Building additions that include a slab on grade construction also are subject to the slab edge requirements listed in the iecc irc. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. Rigid insulation is one of the best tools to reduce your energy costs.

Exterior rigid foam insulation at the edge of slab. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. 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. 4 10 2012 3 climate zones e301 1 6 5 8 4 slab r value table 402 1 1 insulation and fenestration requirements by component e402 1 1 climatezone slab r valued 4 10 2 ft 5 10 2 ft 6 10 4 ft 9.

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. Rigid foam insulation also known as insulating boards provide high r values. The usual solution is to bevel the top of the foam so that concrete will then cover the bevel. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.

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. Eps 3 xps 2 faced or unfaced. You can even place it under the foundation slab.

Install it anywhere from the roof to the foundation. One of the best ways to save money on rigid foam insulation installed under concrete slabs is to ensure the material is not over engineered. 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. They keep your home at a comfortable temperature without the need to crank your heat.

R 7 7 rigid foam insulation model 310891 18 35 18 35. Or as demonstrated here you can cover the slab with rigid foam insulation add two layers of plywood and then add the finish flooring. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring.

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