Termite Shields Slab On Grade

Since slab on grade foundations do not contain below grade living space the key consideration is isolating the interior of the building from ground moisture. No not really but as concrete is a natural product and will crack the termites can get into your house that way or by simply following the plumbing penetrations. In general termite shields should be a minimum of 6 inches above grade and extend out 2 inches on either side of the foundation at a 45 degree angle.

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Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation otherwise both codes require that slab on grade floors with a floor surface less than 12 in.

Termite shields slab on grade. Termites can t get through a slab can they. Slab on grade and independent stem wall with a slab on grade foundation when concrete develops cracks termites enter to seek food sources within the building. Below grade need vertical insulation at the slab perimeter. Here are a few options to consider.

This can be accommodated with a variety of membranes liquid applied materials and gaskets. Before the modern slab on grade construction when most homes had a raised wood floor on a stem wall or piers a strip of sheet metal placed between the foundation and floor framing created a formidable termite barrier because the knife edge of the metal was difficult for them to build a mud tube around. Independent stem wall and slab foundation have an intentional crack or construction joint between the slab and stem wall that is frequently concealed. In addition to making termite infestations visible they also form a capillary break between the foundation and sill.

Stainless steel mesh is often used around penetrations to protect foam etc. In all cases provide a continuous vapor retarder directly under the slab.