Underlayment is an essential component of your roof. Although it often goes unnoticed, it plays a vital role in protecting your roofing system against moisture and heat damage.
Here’s some basic information about underlayment and tips on choosing one for your roof.
What Is an Underlayment?
Underlayment is found between the shingles and the sheathing. It serves as an extra layer of protection, preventing water from reaching the sheathing. It also provides heat and sound insulation, so heat transfer and sound transmission from the outside can be minimized.
Types of Underlayment
- Felt Roofing Underlayment:
This is one of the oldest types of roofing underlayment. It is made of felt paper, which consists of cellulose or fiberglass and is dipped in an asphalt mixture. Usually, this underlayment has a layer of adhesive on one side for easier installation.
- Synthetic Roofing Underlayment:
It is made of laminated polypropylene or polyethylene plastic. This type of underlayment is also better at resisting moisture and weighs far less than felt underlayment. It also protects against ultraviolet (UV) damage.
- Type of Top Layer:
If your roof uses traditional shingles, felt underlayment is the best match. However, if you have a metal roof, you should use a synthetic layer with more heat resistance because metal tends to trap heat more easily than other materials.
In areas with tropical climates, synthetic underlayments are a good choice. On the other hand, if you experience frequent snow and windstorms in your location, you may want to use heavy-duty felt.
This can vary based on the material and labor costs. But generally, felt is more affordable than synthetic underlayment. To know which underlayment type works best in your area and meets your budget, consult a roofing professional.