Rigid Insulation Under Concrete Slab

Horizontal insulation placed less than 12 inches below the ground surface or that portion of horizontal insulation extending outward more than 24 inches from the foundation edge should be protected against damage by use of a concrete slab or asphalt paving on the ground surface directly above the insulation or by cementitious board plywood.

Rigid insulation under 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. R 7 7 rigid foam insulation model 310891 18 35 18 35. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. Eps 3 xps 2 faced or unfaced.

I will always place the poly on top of the rigid insulation as spoke of in the superinsulated slab article. For me this is a no brainer. We re proud to say our products can be found in some of the tallest and safest buildings around the globe like salesforce tower. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.

A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. 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. 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.

Placing poly under the rigid foam runs the risk of the concrete while being placed will find its way below the rigid foam thru cracks and joints. Walls foundations roof and roof decks air distribution ceilings interior. With a minimum of 70 recycled content the installed thermafiber products contributed to valuable leed credits helping the building earn a leed platinum certification. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.

Case study salesforce tower.