Different Options For Waterproofing Your New Roof

Before the roofing contractor replaces your shingles, you need to choose a water barrier. However, since there are several product types, it is important to learn more about the different options, so you can pick the right one.

Plastic Vapor Barrier

One option you have is plastic vapor barrier, which is generally black in color. This material is a thick sheet of plastic that the roofer staples or nails in place, but some contractors may use roofing glue to hold it down as well.

The idea is to stop any moisture that gets underneath your shingles from seeping through the plywood base. This product type is one of the more common items roofing contractors use, because it is easy to install and it can be effective.

One downside to the plastic is if the shingles tear off in a storm, the plastic can come off at the same time. If this should occur, then the plywood gets soaked and eventually a leak will form.

Spray Foam

Another product that some contractors use as a moisture barrier is exterior spray foam. In actuality, the contractor sprays the foam over the plastic sheet, so your home has additional protection. Therefore, if the shingles come loose or break, the plastic does not rip and you may not develop a large leak.

The spray foam also adds extra insulation to your home. This products not only blocks moisture, it stops airflow, which allows your home to keep a constant temperature. Additionally, the spray foam is insect resistant, which means termites and carpenter ants have a hard time damaging it.

Silicone Coating

If you have a flat roof or a low-slope, water can pool in certain spots each time it rains. The longer moisture sits in one spot the higher likelihood that it may seep into your home. To help prevent this, you should consider a silicone coating over a plain plastic barrier.

Plastic sheeting works well on homes that have a reasonable slope, but since this product is stapled or nailed down, water can seep into flat areas. Silicone coatings on the other hand, act like a protective skin that keeps the water out, even in flat places.

Roofers used to use hot tar to get the same effect, because after it cools, the tar creates a thick moisture barrier. However, many roofers have found that silicone is easier to work with and cures quicker.

If you are unsure about which water barrier you should place underneath your shingles, it is best to consult a company like DiRoma Roofing. They can explain the different options in detail and explain why some products are better suited for your home. After you have this information, you can pick the right water barrier to go beneath your home's new roof.


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