The joint depth must be great enough to allow for the proper installation of the TUNDRA FOAM and the hot or cold sealant or caulking material. Joint walls must be as smooth and even as possible and be free of any loose residues or foreign materials. Joints should also be dry and frost free. With a convenient tool or by hand insert TUNDRA FOAM into joint at a level recommended by the sealant manufacturer. Cold applied sealants generally recommend that the depth of the joint after the backer rod is installed be one half the width. In hot pour applications, it is generally recommended the depth of the joint be a 1: 1 ratio in terms of backer rod to sealant.
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