Signs Your Asphalt Roof Needs to Be Repaired

Choosing The Best Underlayment For Your Roof

Roofing underlayment is a material that goes over the roof deck before the main roofing material (such as shingles) is installed. The underlayment serves a critical purpose; it acts as additional protection for the roof. The underlayment is particularly useful for preventing weather-related damage and roof leaks. Here are a few things you should consider to get the right underlayment for your roof.


Just like other materials on the roof, the underlayment is subject to wear and tear that deteriorates it with time. This means the underlayment will lose its protective qualities after some time. How fast this will happen depends on several factors, including the underlayment material.

For example, synthetic underlayment (specifically those blended from different materials) offers more longevity than traditional felt. Ideally, the underlayment should be at least as durable as the rest of the roof so that you don't have to replace it prematurely.

Weather Resistance

Weather-related damages are some of the biggest threats to a typical roof. Heat and moisture, in particular, can cause roof damage, decrease roof longevity, and trigger roof leaks. Some underlayment materials hold up to weather damage better than others. Weather resistance is particularly important if your area experiences various weather extremes in a typical season. For example, a rubberized underlayment is more waterproof than other underlayment materials. This is due to the mixture of rubber and asphalt materials.

Roof Pitch

The pitch of the roof determines how long water, from rainfall or melting snow, stays on the roof. Water stays longer on flat roofs or low-pitched roof than on high-pitched roofs. The longer water stays up on the roof, the more it is likely to percolate through the roofing materials and cause leaks. Thus, you should choose an underlayment with high waterproofing abilities if your roof is flat or low-sloped.

Type of Roof

The type of roofing material also determines the suitable underlayment to install. Is the material prone to leaks? Does the material absorb a lot of heat? How resistant is the material to wind damage? Answering these questions will help you choose an underlayment material for the best protection. For example, if you have a metal roof, which is known for heat absorption, you need an underlayment that can withstand high temperatures without damage.

Roofing underlayment varies by cost, but cost should not be your major consideration when choosing underlayment material. Apart from the above factors, you can also talk to your local home roof service for further information on choosing roofing underlayment.