RESIDENTIAL BUILDING - SLAB

• Determine if the required base material is four inches thick and consists of clean, graded sand, gravel, crushed stone or crushed slag.
• Determine if a vapor retarder is provided except for slabs located in a detached garage, utility building, or unheated accessory structure.
• If a vapor retarder is required, then determine if it is a 6 mil visqueen vapor retarder with joints lapped not less than six inches and placed at the bottom of the slab.
• Determine if the slab is a minimum of 3½ inches thick.
• Verify that interior concretes compressive strength at 28 days is at least 2,500 psi and 3,000 psi air entrained, when exposed to weather conditions. (Check delivery tickets)
• Check and note how the radon depressurization method will be vented: Gas tight “T” into aggregate or through the sealed sump cover.
• Verify that required and approved perimeter slab insulation is installed properly.

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