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When built to code roof sheathing is installed with a 1/8" to 1/4" space at the seams. Therefore, this leaves gaps of 12 to 24 square inches per 4x8 sheet of sheathing. A 4,000 square foot building can have approximately 200 sheets of sheathing; thus, a fully exposed roof deck could have up to 33 square feet of open space for water to enter the building. This is the equivalent of 1 full sheet of plywood missing.
Testing at ITW Foam Seal's Technical Center shows that the application of Foam Seal Hurricane Adhesive to the sheathing seams reduces water intrusion considerable. Roof coverings (shingles and tile) are usually the first things to fail in high winds like those experienced during hurricanes. Once the roof covering is damaged water will easily pour into the attic through these open gaps now exposed. With Foam Seal SF2100 there will be no need for costly mold removal or a fashionable blue tarp to be placed over your roof after a storm of high wind event.
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Updated: 05/23/2013 |
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