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, TUFF-N-DRI Barrier Board is applied, the foundation can be backfilled in 24 hours. It may take longer during some weather conditions for the TUFF-N-DRI Membrane to cure, and the ' foundation should not be backfilled until the membrane is fully cured. 4. When installing 4x4 boards, install the bottom board first then immediately place the top board. ' This prevents any excess TUFF-N-DRI Membrane from running down and onto the top edge of the bottom board. ' S. It may be difficult to achieve the desired adhesion characteristics when applying the thicker WARM-N-DRI or TUFF-N-DRI Barrier Boards, or if the foundation wall is not smooth. Adhesives, or non-corroding masonry nails and mechanical fasteners can be considered. Consult your TBS ' Technical Representative for availability and detailed application instructions on these products. ' 6. Another technique to enhance board adhesion is to wet the back-side of the WARM-N-DRI or TUFF-N-DRI Barrier Boards with a calcium chloride solution before installing the board to the membrane. The solution is simply prepared by mixing up a ratio of approximately 2-3 pounds of ' granular calcium chloride per 1 gallon of water. Be aware that dissolving the calcium chloride can heat the water significantly, up to 150°F (66°C). , 7. Wet the board with the solution using a watering can or weed sprayer or similar device. It is not necessary to drench the board; simply dampen it. Install the wet side of the board into the wet TUFF-N-DRI membrane. Consult your TBS Technical Representative for more instruction on � this procedure. Cold Weather and Inclement Weather Application Information , 1. It is possible for the TUFF-N-DRI Membrane to be applied at temperatures lower than 20°F (-7°C). The Contractor assumes responsibility for ensuring the TUFF-N-DRI fully cures to a dry film thickness of 40 mils. Applying the 60-mil wet thickness of the TUFF-N-DRI membrane ' in one coat is recommended for application temperatures below 20°F(-7°C). Heating the product to the maximum application temperature of 130°F (54°C) at the spray tip is also recommended. ' 2. It may take longer than 24 hours for the TUFF-N-DRI membrane to fully cure during periods of low temperatures, high humidity, rainfall or snowfall following the membrane application. � Therefore, wash-offs due to the application of TUFF-N-DRI membrane during or immediately before inclement weather are possible. The TBS Contractor assumes responsibility for ensuring the TUFF-N-DRI fully cures to a dry film thickness of 40 mils in all areas of application. � Additional Application Information and Limitations Crawlspaces The TUFF-N-DRI Full-System Limited Warranty includes crawlspaces only when the following criteria are met: ' 1. The crawlspace must have a proper exterior drainage system that channels water to the lower foundation footing drains which drain to a functional sump or to drainage pipe properly sloped to � daylight. See Drainage Requirements listed below. 2. The crawlspace must have a finished concrete floor. Crawlspaces with dirt or gravel floors do not ' meet warranty requirements. 3. Exterior crawlspace walls must be block, parged block, poured concrete, or pre-cast concrete ' and must meet preparation requirements listed above. '