Comparing Synthetic vs Felt Underlayment

Roofs are more than just shingles or metal covering; they have an essential layer of protection beneath them that many might overlook.

This layer is known as roofing underlayment, and it plays a crucial role in shielding your home from moisture damage. Let's delve deeper into this vital component of your roof's structure.

WHAT IS ROOFING UNDERLAYMENT?

Roofing underlayment is the layer between the shingles and the roof sheathing, which is typically plywood or OSB.

Installed directly on the roof deck, it provides a secondary shield against the elements, including rain, snow, and wind.

TYPES OF ROOFING UNDERLAYMENT

There are two main types of roofing underlayment:

1. Felt
2. Synthetic

Each type has its pros and cons, and your choice may depend on factors like your geographical location, roofing materials used, roof design, budget, and recommendations from your roofing contractor.

FELT ROOFING UNDERLAYMENT

Felt roofing underlayment is one of the oldest types, made by saturating paper or fiberglass mat with asphalt.

It usually comes in two types: No.15 felt and No. 30 felt. The latter is thicker, stronger, and less prone to tearing during installation or weather events.

PROS

• Cost-effective: Felt underlayment is usually cheaper than synthetic, making it a popular choice for budget-conscious homeowners.

CONS

• Limited exposure time: Felt can't be exposed for long periods as it may dry out or lose effectiveness.
• Prone to tearing: Especially in high winds or during installation.
• Moisture absorption: If exposed to moisture, it can wrinkle and affect shingle installation.
• Heavy and slippery: Difficult to handle and install.

SYNTHETIC ROOFING UNDERLAYMENT