A storm rips through, and now there's a hole in your roof. Water is coming in, the forecast says more rain tonight, and nobody can get out there to fix it until next week. This is the exact situation an emergency tarp exists for.
Roofers use tarps as a stopgap after storms. It's not a repair — it's buying time. Done right, a tarp keeps the water out until a real fix can happen. Done wrong, it causes more damage or puts someone on a slick roof who shouldn't be up there. Here's what a tarp can actually do, when it's worth the trouble, and how the pros handle it.
What a tarp actually does
A heavy tarp stretched over the damaged section and sealed at the edges sheds rain the way intact shingles would. It sits between the sky and the bare decking or torn shingles, and it directs water down and off the roof. In practice, it can hold for days or weeks while you line up repairs or wait out weather.
What it doesn't do: fix anything. The damaged shingles are still damaged underneath. The tarp won't match your roof, it won't look good, and it can trap heat and moisture in ways that aren't great long term. Think of it like a bandage — it protects the wound, but it's not treatment.
When tarping is worth it
There are a few clear situations where a tarp is the right call:
There's an active leak. If water is coming into the house, stopping it is the priority. Every hour of water intrusion damages drywall, insulation, flooring, and possibly wiring. A tarp stops the bleeding.
More rain is coming. Even a small tear in the roof covering becomes a big problem in a downpour. If the radar shows more weather on the way and repairs are days out, a tarp buys you a dry interior.
The decking is exposed. Missing shingles over a large area, a fallen tree punched through, or hail stripped the granules down to bare spots — exposed underlayment or bare wood rots fast when it stays wet. Covering it up prevents the damage from spreading.
Your claim is in progress. Insurers expect homeowners to take reasonable steps to prevent further damage after a loss. Tarping the roof is the standard example. If you skip it and the interior gets soaked over the next week, the adjuster may question part of the claim. Keep your receipt.
When it doesn't help much
Not every situation calls for a tarp. If the damage is minor — a few lifted shingles with no leak and no rain in the forecast — you can usually just schedule the repair and skip the drama. Tarping a sound roof "just in case" adds risk (walking on a roof in wind, fasteners pulling at shingles) without much payoff.
Also, a tarp is a poor answer for a leak that's been going on for months. Long-running leaks soak insulation and decking, and by the time you notice the ceiling stain, the interior damage is done. That situation needs repairs, not a tarp over the top.
How to get it done without making things worse
If you're doing this yourself, the biggest risk isn't the tarp — it's the ladder and the roof. Wet, debris-covered, or storm damaged roofs are dangerous. If the roof is steep, slick, or you're not steady on your feet, call someone. No tarp is worth an emergency room visit.
That said, here's how a proper tarp job goes:
Size up the area first. You need a tarp big enough to extend past the damage in every direction — at least 3 to 4 feet beyond the torn area on all sides, including over the ridge if the damage runs up to it. Most residential tarps are 12×16 or 16×20 feet, and bigger is better. The cheap blue ones from the hardware store tear in wind; the heavier woven tarps (often brown or silver) hold up far longer.
Anchor the top edge above the damage. The key to a tarp that stays put is where it's attached. The top edge should be tucked or fastened above the damaged section — ideally slipped under the shingles or ridge on the up-slope side — so water running down the roof goes over the tarp instead of under it. If you just lay a tarp over the hole and weight the edges, wind gets under it and rain runs beneath it.
Fasten, don't just weight. Sandbags and bricks slide off in high wind. The standard method uses 2×4 battens: roll the tarp edge around a board and screw or nail the board to the roof through the tarp. This holds against wind without tearing the tarp. If the roof is already scheduled for repair, the screw holes are a non-issue — they're going into decking that's getting re-roofed anyway.
Seal the seams. Where the tarp meets intact shingles, water can wick underneath. Some pros run a bead of sealant along the contact line. Don't go crazy with adhesives on shingles that aren't being replaced, though — ripping a glued tarp off good shingles pulls granules and creates new problems.
Check it after wind. Even a well-set tarp loosens. If another gust front rolls through, walk the property and look up. A flapping corner can be re-secured in minutes; a tarp that's halfway across the yard did you no good.
What a professional does differently
Emergency roofing crews tarp roofs daily, and they're faster and safer at it. They work in pairs, they know where the decking is solid enough to walk on (not always obvious after storm damage), and they carry reinforced tarps, proper battens, and the right fasteners. Some also document the damage with photos before covering it — which your adjuster will want to see.
Many roofers offer emergency tarping as a standalone service, and some run 24-hour storm lines after big events. The cost varies by market and roof size, but it's a fraction of the cost of replacing soaked drywall and insulation throughout an attic. And as noted, it protects your claim.
Tarping and your insurance claim
From the insurer's side, tarping is what they call mitigation — a reasonable step to keep a covered loss from getting worse. Save the receipt from the tarping company (or the hardware store, if you did it yourself) and take dated photos of the damage before and after the tarp goes on. Include those photos and the receipt with your claim paperwork.
One more thing: don't sign anything on the spot with whoever shows up with a tarp. After big storms, door-to-door crews offer free tarps as a foot in the door, and some bury contract language in the paperwork you sign. A tarp should never come with strings attached.
A tarp is a short-term fix for a simple problem: keep the water out until the real repair happens. If your roof took storm damage, the storm-damage guide covers what to check once it's safe to look, and the roof repair page walks through what a lasting fix actually involves.