FeltBuster Synthetic
GAF FeltBuster is a high-performance synthetic underlayment that is stronger and lighter than traditional felt. It provides excellent water resistance and UV protection.

Key Features
Technical Specifications
Expert Analysis: Pros & Cons
Advantages
- Much stronger than felt
- Lightweight and easy to handle
- Long UV exposure tolerance
- Lays flat for easier shingle installation
Considerations
- Higher cost than felt
- Not vapor permeable
- Can be slippery when wet
Regional Performance Ratings
Excellent for harsh winters
Superior moisture protection
Strong against wind-driven rain
Good but may get hot
Ideal for rainy climates
Excellent moisture barrier
Frequently Asked Questions About FeltBuster Synthetic
How long can FeltBuster Synthetic be exposed to UV before installing shingles?
FeltBuster Synthetic has a UV exposure rating of 90 days. This means the underlayment can remain exposed to sunlight for up to 90 days before shingles must be installed to maintain warranty coverage.
How much does FeltBuster Synthetic cost per square?
FeltBuster Synthetic typically costs between $7 and $10 per roofing square (100 square feet). Actual prices may vary based on location, supplier, and quantity purchased.
Is FeltBuster Synthetic breathable?
No, FeltBuster Synthetic is not vapor permeable. It provides excellent water resistance but does not allow moisture to escape through the material.
What warranty does FeltBuster Synthetic offer?
FeltBuster Synthetic comes with a 25-year limited. For full warranty terms and conditions, contact GAF directly or consult with your roofing contractor.
Quick Summary
Compare quotes from local contractors


