Can Roofing Felt Get Wet

Last updated: 2026-08-25 by Ted Sellers, Owner

Roofing felt can get wet, but whether it can stay in place depends on the exact underlayment, how much water it took on, and its manufacturer’s written exposure limit. A brief shower is not automatically a failure; wrinkling, tearing, trapped moisture, or prolonged exposure are reasons to stop and inspect before shingles go on.

“Roofing felt” is often used for asphalt-saturated felt, although many newer roofs use synthetic underlayment. They do not have the same installation or exposure rules. Treat the product wrapper and current manufacturer instructions as the final authority.

What should you check after roofing felt gets wet?

Do not cover wet, damaged, or poorly attached underlayment just to keep a job moving. Let the roof dry when conditions allow, then check the membrane and the roof deck before installing the finished roof covering.

• Look for wrinkles, tears, lifted laps, and loose fasteners. These can keep shingles from lying flat or create paths for wind-driven water.
• Check the deck from below when possible. Staining, wet insulation, or soft wood deserves a closer assessment.
• Confirm the product’s allowed exposure period. That limit varies by product and is not interchangeable between felt and synthetic underlayment.
• Replace compromised sections. A small, clearly damaged area may be repairable; widespread damage or loss of adhesion is a different situation.

Can asphalt roofing felt be installed in rain?

Asphalt roofing felt should generally be installed only when the deck and conditions meet the manufacturer’s instructions. Installing over a wet deck can trap moisture, and rain can make laps, footing, and fastener placement unreliable.

Roofing work also needs to follow the applicable code and the roof-covering manufacturer’s installation details. Minnesota’s residential roofing provisions are a useful code reference, but they do not replace the instructions for the specific underlayment and shingle system being installed.

Review the Minnesota Residential Code roofing provisions and compare them with the current documentation for the exact product on the roof.

Felt vs. synthetic underlayment after rain

Question	Asphalt-saturated felt	Synthetic underlayment
Can it get wet?	It may tolerate incidental moisture, but it can wrinkle or lose its flat lay.	Many products are designed to resist incidental water, but the product instructions still control.
Can one rule cover every product?	No. Weight, composition, attachment, and exposure limit vary.	No. Exposure ratings and installation requirements vary by manufacturer.
What should happen before shingles are installed?	Inspect the deck, laps, fasteners, and surface condition.	Inspect the deck, seams, fasteners, and visible damage.

The practical point: “synthetic” does not mean indefinitely weatherproof, and “felt” does not mean every wet section must automatically be replaced. The correct answer comes from inspection and the specific product documentation.

When does wet underlayment need professional attention?

Ask for an assessment when water has entered the building, the deck feels soft, the underlayment has buckled, or the roof was left exposed beyond its product instructions. Those issues can affect the roof system beneath the shingles, not just the visible surface.

• Water stains on ceilings or walls
• Visible deck sagging, soft spots, or deteriorated wood
• Large areas of wrinkled, torn, or wind-lifted underlayment
• Shingles installed over a surface that was visibly wet or damaged
• Uncertainty about the product or the time it was exposed

What should a homeowner do if a reroof is interrupted by rain?

1. Document the roof’s condition with photos before anyone covers the area.
2. Keep people off a wet roof; footing and loose materials are hazardous.
3. Ask the contractor which underlayment was used and for its current installation instructions.
4. Have the deck, laps, penetrations, and flashing areas checked before the finish roof is installed.
5. Keep a written record of the assessment and any material replacement.

If a leak appeared during a reroof or you are unsure whether an exposed underlayment layer is sound, start with a roof leak assessment. For a St. Paul inspection and written next steps, request a roofing estimate from Sellers Roofing Company.

Frequently asked questions

Can roofing felt get wet overnight?

It may be exposed to a short rain event without automatic failure, but there is no universal overnight rule. Inspect the condition and follow the exact product’s current exposure and installation instructions.

Will wet felt dry out under shingles?

Do not assume trapped moisture will harmlessly dry after shingles are installed. The deck and underlayment should be assessed and dry enough for installation under the applicable product requirements.

Does synthetic underlayment handle rain better than felt?

Many synthetic products are made for better tear and water resistance, but performance varies by product. Review the manufacturer documentation instead of relying on the material category alone.