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Increasing amounts of Destruction

In recent years, the economic consequence of structural damage due to hurricanes has become increasingly evident. This increase in damage can be directly attributed to two factors: increased demand for housing along coastal areas, and the number of inferior strength homes being impacted by these hurricanes. Even the new building codes are only designed to withstand pressures associated with a category 3 hurricane.

The weakest parts of wood construction are the connections holding the wood together. When a roof is built the plywood sheathing is nailed to the rafters creating the structure of the roof. These nails provide the only connections holding the roof together. During a hurricane the winds produce large amounts of suction pulling upwards on the roof. This pressure pulls up on the sheathing prying the nails back out of the rafters. Even if the roof doesn’t fail, each passing hurricane weakens the connections holding the roof together, which increases the chances of failure during future storms. The most efficient way to strengthen the weakest part of a buildings structure is Foam Seal SF2100 Polyurethane Adhesive.

Adhesives in roof protection

Uplift Protection

The structure of a roof is held together by a series of nails connecting the trusses to the sheathing. The continuity of this connection is limited by the spacing of the nail. The most current building codes have increased the frequency of nail connections but there strength is still limited. Adhesives work well in this application since they can be applied in a continuous bead along the length of the rafter, enabling the load to be transferred evenly along the entire length of the roof. When the Foam Seal SF2100 product is applied to the truss and sheathing its uplift resistance is increased up to 5 times stronger then nails alone.
A roof built to the strongest building codes in the country will withstand uplift pressures of 750 pounds to separate the sheathing from the trusses. These uplift pressures are associated with a medium strength hurricane, so the chances of roof failure go up considerably in higher strength storms. Testing shows if the envelop of the building is breached pressures will instantly double increasing the uplift pressures trying to pull the roof off. In our uplift video the same roof with Foam Seal SF2100 will test over 3,000 pounds of pressure to separate the structure of the roof.

Water Intrusion

Foam Seal is sprayed on as a liquid quickly hardens into a water tight seal. This reduces water intrusion by 99% even if the roof covering is removed. Foam Seal Hurricane Adhesive is a PATENTED moisture sealing foamed polyurethane sheathing adhesive.  The sheathing of built to code roofs are connected by brackets that create a separation of 1/8” to 1/4” between every piece of sheathing. A 4,000 square foot building can have approximately 200 sheets of sheathing. If you add up the open spaces between all of the sheathing there will be over 33 square feet that is completely left open. That is the equivalent of 1.5 sheets of plywood missing.

If the roof covering is blown off the roof or even slightly damaged there is nothing to stop the water from pouring into the house. Roof coverings (shingles or tile) are usually the first thing to start failing in a high wind event. The closed-cell Foam Seal product will create a water tight barrier between all of the pieces of sheathing. This will keep the water from entering the attic through the gaps, eliminating the possibility for dangerous and costly mold spores to grow and spread. Foam Seal hurricane Adhesive is your last line of defense when the roof covering is damaged during a hurricane.

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Updated:  09/19/2013

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