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All About Commercial Roofing Attachments

(A-One) Commercial Roofing Attachments

Roofing systems are attached to commercial building using either full adhesion or mechanical attachment. There are other methods available, but these two prove to be the most common. As a commercial building owner, you should be aware of the differences as well as what each method entails. You don’t want to pay for roof attachment that doesn’t add value to the building or that doesn’t compliment your building needs and style.

Fully adhered roofing

Full adhesion of a roof involves gluing the roof directly to the insulation layer below it. The insulation boards act both as insulators and to secure the roof to the metal deck below it. This roofing attachment option is usually more expensive, time-consuming and comes with challenges. The large quantities of glue needed for adhesion must be applied at the same time and at the right temperature. You have to wait for the glue to dry and to reach the correct tackiness. You then use a weighted roller to press the membrane to the insulation layer.

The fully adhered roof is often preferred because it is believed to be more resistant to leaks. In reality, this is not always true. Many think that if water gets through a hole it will flow along the membrane and past the glue. Many builders use fully adhered roofing because of the belief that it is more resistant to leaks, but this is not necessarily true. If you are not aware of any leaks, the water will be allowed to accumulate, however, and this will degrade the glue over time. Water can spread further through the roofing system causing more widespread and expensive damage.

Mechanically attached roofing

In the commercial market, mechanically attached roofing is used about 80% of the time. It is so popular because it is both inexpensive and easy to install. Mechanically attached roofing is also easy to inspect by the builder. The workmanship can be quickly validated by verifying the fastener patterns along the membrane. To install a mechanically attached roof, you roll down the membrane and apply screws along the edge of the membrane, making sure they go all the way through the insulation boards to the metal deck. All screws will be covered by the edge of the next membrane sheet to be rolled out. You then use a hot-air gun to weld together the membrane and roofing. The result is a flat, waterproof surface with no gaps.

Final thoughts

Fully adhered roofs get higher ratings by Factory Mutual, which is a large insurance firm that designates wind-uplift ratings to all commercial roofing. However, high rating is not really beneficial unless your building is located in a coastal or high-wind area. Choosing a mechanically attached roof may be more feasible in cases where there are no winds. To decide which roofing attachment will work best for your commercial building, contact us today and we will find the roofing system to best suit your needs.
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