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Huviratacuxy (Huviratacuxy)
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Username: Huviratacuxy

Post Number: 1
Registered: 03-2014
Posted on Friday, March 07, 2014 - 12:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

When you think roofing materials, you think shingles. Once installed, the shingles are the only material you see. They're also the first line of defense between your home and the elements. However, more goes into a high quality roof than meets the eye. Without roofing underlayment for instance, your roof wouldn't be able to keep out the elements. The roofing underlayment is a crucial yet often forgotten component of a roof.

What is the roofing underlayment?

As the name implies, it is a layer that goes beneath the shingles. The roofing underlayment is placed directly onto the roof deck. The roofing shingles are then placed on top of the underlayment. The primary purpose of the roofing underlayment is to act as a second barrier against water. Because water can seep through any cracks in the roofing shingles, the underlayment is there to keep water from getting through the roof deck and into the home. The roofing underlayment seals the areas where nails have gone through the roof deck.

In addition to forming a water tight seal for the roof deck, the roofing underlayment also allows the roof deck to “breathe.” In other words, moisture can still escape the home but moisture won't be able to get in.

Types of underlayment

The most common type of roofing underlayment is made of black felt paper which is then coated with asphalt. The asphalt coating bonds with the shingles that are placed atop the underlayment forming a watertight seal.

Advances in technology have allowed roofing material manufacturers to create synthetic roofing underlayment. Synthetic underlayments are made with a synthetic polymer. It is considered a higher performance roofing underlayment ideal for climates where extreme temperatures and weather is common.

Ice and water shields

Another type of roofing underlayment is the ice and water shield. This isn't a replacement for the traditional felt paper underlayment but rather a layer of extra protection. The ice and water shield is a peel and stick membrane that is placed along the edges of the roof and around vents, chimneys, valleys, skylights, and any other areas where your roof is most vulnerable. The ice and water shield keeps melting ice and wind driven rain from getting through any cracks.

So while shingles might get all the attention when it comes to roofing materials, you can't forget about the roofing underlayment.

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