Why the hidden layer is the real waterproofing on tile roofs.
What it does
Tile sheds most water; underlayment is what actually keeps the house dry.
Felt vs. synthetic
Synthetic and modified products resist heat aging far better than 30-lb felt.
Two-ply systems
Two layers provide extra protection and are often worth the modest upcharge.
Relay timing
Replace underlayment before it fails to avoid ceiling and deck damage.
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