Foam Board Insulation Under Concrete Slab

Insulating properly below grade can help prevent total structure heat loss and reduce heating and cooling bills by 10 20. Depending on your location you may need rigid foam insulation under and around the edges of the slab by martin holladay issue 245 aug sept 2014 while walls and roofs have long been a point of focus foundations seem to be the final frontier when it comes to insulation. This article discusses the use of polyisocyanurate foam board insulation below concrete slabs.

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Lack of foundation insulation on below grade and under slab projects can account for up to 25 of a structure s total heat loss.

Foam board insulation under concrete slab.

We describe research on the effectiveness of polyisocyanurate foam boards under a concrete building floor slab and we compare using polyisocyanurate sub slab insulation with polystyrene foam insulation below a concrete slab. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Concrete 3 existing drywall 2 plywood 3 wood 2 sheathing type. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.

Get free shipping on qualified eps under slab foam board insulation or buy online pick up in store today in the building materials department. Shop eps insulation shop polyiso insulation shop xps insulation. 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. Below grade under slab with foamular xps insulation.

For foam plastic insulation extrusion matters xps performs better than eps pdf. R 15 scored squared edge rigid foam board insulation sheathing model 9gb view the owens corning. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. Foamular foamular 250 3 in.

Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. Eps 3 xps 2 faced or. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building. 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.

Polyisocyanurate foam insulation properties. Get all the construction documentation you ll need.

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