3 Types of Underlayment 

The three kinds of underlayment—asphalt-saturated felt, non-bitumen synthetic underlayment and rubberized asphalt underlayment—each have their pros and cons.

• Asphalt-saturated felt underlayment – This is the most affordable option of the three and comes in 15-pound and 30-pound varieties. The 30-pound variety may be stiffer than the 15-pound option, but it’s less likely to be damaged during roof installation. 
• Non-bitumen synthetic underlayment – This is more resistant to water than asphalt-saturated felt underlayment, which is also why most roofing contractors prefer this kind of material. 
• Rubberized asphalt underlayment – Thanks to its protective membrane, which has a high percentage of asphalt and rubber polymer and adhesive underside, this type of underlayment is completely waterproof, but it’s also the most expensive option. Given its features, however, rubberized asphalt underlayment is certainly worth the cost. 

To maximize the protection provided by underlayment, only hire certified contractors. After all, even the most expensive or durable underlayment won’t be able to protect your roof if it isn’t installed properly. 

Looking for qualified contractors in your area? 

In business since 1995, A Cut Above Exteriors offers a wide range of professional roofing services.  To request a free estimate, call us at (503) 334-0733 or leave us a message here. We serve homeowners in Portland, OR, as well as the surrounding communities in Oregon.