When your roof is leaking and a professional cannot get there right away, your goal is simple: slow the water down and limit the damage until a real repair can happen. A few safe stopgaps can buy you days or even weeks. None of them is a permanent fix, and none is worth risking your neck for. Here is how to hold the line, from inside and out, and the mistakes to avoid.
Never go on the roof in a storm
A wet, steep, or wind-loaded roof is one of the most dangerous places you can be, and falls cause serious injuries every year. If it is raining or the roof is wet, work from inside the attic instead. Save any rooftop work for dry conditions, with proper footwear and a stable ladder on firm ground.
First, contain the water inside
Before anything else, limit the damage indoors:
- Move furniture, electronics, and valuables out from under the drip, and put down a tarp or towels.
- Put a bucket under the active leak.
- In the attic, if you can safely reach it, staple or tack plastic sheeting to the underside of the roof above the leak, angled to funnel water into a bucket.
- Photograph the damage and the water for your insurance claim before you clean anything up.
Drain a bulging ceiling on purpose
If a section of ceiling is sagging and heavy with trapped water, carefully poke a small hole at the lowest point of the bulge and let it drain into a bucket. A small, controlled hole is far better than a whole ceiling coming down at once.
Temporary fixes from outside, only when it is safe
Once conditions are dry and safe, one of these can slow or stop the leak:
- Tarp it. For a larger area, a heavy tarp of at least 6 mil is the most reliable stopgap. Make it big enough to extend about 4 feet past the damage on every side. Run it from the ridge down past the eaves, wrap the top edge around a length of 2x4 laid just over the ridge, and anchor the sides with more 2x4s. A tarp lasts roughly 30 to 90 days, less in harsh coastal sun and wind.
- Roofing cement. For a small crack or hole, trowel roofing cement over a clean, dry surface, spreading it a couple of inches past the damage. It holds for a few months.
- Sealant or flashing tape. Self-adhered patch tape works on small holes. Clean and dry the area, cut the tape a few inches larger than the hole all around, and press it down firmly from the center out.
Why this is only a stopgap
Every one of these buys time, usually a month or two, not a permanent solution. Water that has already gotten in keeps damaging the decking, insulation, and drywall, and mold can start to form within a day or two. Call a roofer to schedule the real repair, ideally within a couple of days. The first step in a proper fix is finding where the water actually enters, which we cover in how to find a roof leak.
Go easy on the sealant
Slathering roofing cement or tar over a wide area can hide the true source of the leak and make a professional repair messier and more expensive. Use just enough to cover the damage, and let the roofer handle the rest.
What not to do
- Do not walk the roof during a storm.
- Do not over-caulk or drown the area in tar.
- Do not treat a bucket as a fix and ignore the leak, since the damage keeps growing.
- Do not assume the leak is directly above the stain, because water travels before it drips.
If the leak is happening right now in a storm, follow the calm, step-by-step version in our guide to a roof leaking during a storm.
“A tarp buys you days, not months. The moment the weather clears, line up the real repair before the next rain finds the same hole.”
Get the permanent repair scheduled
A temporary patch is a bridge to a proper fix, not a substitute for one. To know what that repair should cost, see roof leak repair cost.
With Hommy you can post the job once and get responses from vetted local roofers who handle leak repairs, each with real ratings from other homeowners, so you can go from a tarp to a real fix fast.
