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	Brief History of SPF Sprayed Polyurethane Foam

	Sprayed Polyurethane Foam has been used as a roofing and insulation material for over 30 years. At one time it was considered to just be an alternative to built-up roofing; SPF roofs now protect a wide range of buildings. During this time, SPF systems have proven themselves through comprehensive, independent studies to be dependable, long lasting, and very affordable. Today there are foam roofs that have been in place for over 30 years, and they have many advantages over traditional roofing methods. It's like putting a monolithic blanket or your entire building.
	SPF's Waterproofing Ability Sprayed Polyurethane Foam is perfect for many different waterproofing applications. Because it is composed of billions of closed cells, the foam acts as an air barrier, preventing moisture infiltration into the building. This ability minimizes dew point problems, which unchecked leads to water condensation inside of the structure. Moisture infiltration into the building envelope is the number one cause of building deterioration. Even when the top coating of an SPF roof is damaged, the underlying foam will keep the roof from leaking. The Superdome in New Orleans was damaged once in a severe hail storm. Thousands of hairline cracks appeared in the top coat, but no leaks ever occurred, even though it wasn't repaired for over a decade! If a penetration does occur all the way through the foam layers, the water infiltration will be isolated only to the area where the membrane has been penetrated. Small penetrations in SPF systems can be repaired easily with an elastomeric caulk reinstating the integrity of the system. Water pounding is quite often a problem with conventional roofing systems. When applying the polyurethane foam in re roofing situations, it is very easy to build up areas of greater thickness while spraying, so that water will drain properly. This also eliminates the problem of the additional weight load associated with water accumulation.
	How does a foam roof wear out? Rigid foam is an expanded plastic. If you were able to look closely at its fine, cellular composition, you would see that it is mostly space. A foam roof consists of foam and a highly specialized coating or graveled surface keeps sunlight from getting to the foam. If exposed, sunlight can degrade the cell walls and gradually wear away layers of cells. If the coating is allowed to wear out, the foam surface will become pitted. It would take many years of neglect and exposure for the foam to wear away enough cells for the roof to leak.
	Increasing durability Our foam roofs will outlast the competition with no attention or maintenance. We have developed over the years, a simple effective way to get the most for your roofing dollar. Like a hard-wood floor, periodic refinishing can make a foam roof last much longer. The time to resurface a hard-wood floor is before the protective coating has worn away and allowed the wood to suffer. This is why we offer re coating on perfectly good roofs that are 10-years old. Our experience has shown, after thousands of roof samplings, that upgraded roofs are in excellent condition and do not need more coating at fifteen years of age. Code Approvals Foam roofing systems are fire retardant to (Class A). Tar roofs are only Class C. Foam has been tested and approved by Factory Mutual, UL and the State Fire Marshall. General Care for Foam Roofs Roof Drains: 1. Keep drains clear of debris, or water may spill over the edges. 2. Wind, rain, and fall leaves can cause a repeated need to clear drains. 3. Screens shaped like a light bulb can be found at most hardware stores for round drains. 1/4" wire mesh can be fashioned to make a box for covering larger drains. The screens may prevent a clogged down-pipe. Modifications/Alterations What to use: 1. Polyurethane sealant is used for detail work when the roof is installed and is suitable for touch-up use. 2. In existing foam roofs, skylight, electrical, A/C and other installations which require roof penetrations can be sealed with a surface flashing and a good quality polyurethane sealant without the need for expensive re-foaming. Please, call before you cut. Never Use: 1. Silicone sealants. It discolors and may not stick. 2. Any "Tar" product. If it's black, don't put it on your roof. 3. Foam in a can or froth packs. It is not suitable for roofing. It will soak up water. Service Calls: 1. Notify us immediately if you think our roof has something wrong with it. 2. You will be billed for a service call if your roof is out of warranty. 3. Service calls are billed at $65 per man hour plus materials.


	Bonner Roofing & Sheet Metal Company 2502 West 1st Street. Sanford, FL 32771 Phone: 1-800-854-7663 Fax: (407) 321-0093