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How soon must the underlayment be covered with shingles?

Underlayment can be exposed for a fairly long time, but it must not be covered unless it is still flat and elvel.

If the underlayment has ripples and bumps that will make the shingles lay unevenly, you will need to replace the underlayment. If your contractor left your roof exposed in the rain, it is recommended that you take a look up there yourself to make sure everything is ready for the shingles.

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