Why Is Roofing Underlayment Important?

The underlayment is one of the biggest components of a roofing system. This part of the roof is made of a waterproof material, and it’s found right underneath the roof’s visible surface. What makes the underlayment so important? Our roofing services experts say there’s more than one answer.

The Last Line of Defense

If the roof’s outermost surface is the home’s first line of defense against the elements, then the underlayment serves as the last line. Beyond the underlayment lies the deck, struts and other components of the roofing system that are not designed to withstand the harsh weather.

Protection From Water

The most obvious purpose of an underlayment is to form a waterproof barrier for the rest of the roof. Metal roofing experts say that while the topmost layer is designed to shed off rainwater and snow, some of the moisture can still seep through the seams or gaps between individual shingles. An underlayment stops the moisture from spreading further, preventing possible damage.

Protection From Wind

The underlayment also helps minimize damage caused by strong winds. Without the underlayment, a roof with a missing shingle will have a hole directly blowing inside, creating negative pressure that can lift the rest of the roof. With an underlayment, a missing shingle will just reveal another sealed-off surface so the wind can’t do as much damage.

Proper Installation

Any roofing and siding contractor will tell you that the underlayment will only function as expected if installed properly. Even minor mistakes during installation can compromise its ability to serve as a waterproof barrier for the rest of the roof. This is why we strongly recommend having your underlayment installed by certified roofers.

Let us help you get an underlayment that won’t underperform.  Custom Installations is the leading roofing contractor in Lake Forest, IL, as well as other areas in Illinois. Call us at (847) 558-1967 or fill out this contact form to request a quote.