Slab Foundation Sealing

Select sealants that:

are compatible with their intended surfaces,

allow for differential expansion and contraction between dissimilar materials,

meet the requirements of the applicable fire safety code (e.g. thermal or ignition barriers), and

for use inside the pressure boundary select low volatile organic compound (VOC) sealants that meet independent testing and verification protocols

Select materials that:

adequately support applied load and are permanent air barriers,

meet the requirements of the applicable fire safety code (e.g. thermal or ignition barriers),

for use inside the pressure boundary select low volatile organic compound (VOC) materials that meet independent testing and verification protocols, and

pest-resistant materials that are rated for ground contact anywhere they are in contact with the exterior foundation walls, piers, or bare earth

Install steel wool or other pest-proof material as infill in gaps greater than 1/4" before sealing

Remove any material from the sealing area that will prevent full adhesion of the selected sealant

Apply a continuous seal at all seams, cracks, joints, penetrations, and connections of the slab while applying sufficient pressure to push sealant into any gaps or cracks and contact any backing or infill material required

Install only noncombustible materials and sealants with an ASTM E136 listing in contact with any device producing 200 degrees F or more (chimneys, vents, flues, etc.)