Synthetic underlayment vs. felt: what goes under your shingles?

Underlayment is the water-resistant layer between your decking and your shingles — your backup if a shingle blows off.

Felt

• Traditional, lower cost
• Can tear and wrinkle, and absorbs moisture

Synthetic

• Stronger and more tear-resistant
• Lies flatter and sheds water better
• Safer to walk on during installation

RezComm installs synthetic underlayment on our roof replacements, plus ice-and-water shield in valleys and other leak-prone areas.

Related: Roof replacement · What to expect · all guides

Written by Mike Davis, owner of RezComm Professional Services.

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