A tarp buys you time, not a permanent fix
A roof tarp is a temporary cover you stretch over damaged shingles, a hole, or an area where water is getting in. It stops rain from entering your home while you wait for a roofer or save for repairs. A tarp does not replace the roof underneath — it just keeps water out for weeks or a few months, depending on weather and how well you find it.
The tarp itself is cheap (usually $20 to $50 for a basic one large enough to cover problem areas), but the real work is anchoring it so wind does not tear it loose or fold it back. A poorly secured tarp can cause more damage than no tarp at all, because flapping edges let water underneath and the tarp itself can damage shingles when it moves.
Key Takeaways
- A roof tarp is temporary protection that stops water from entering while you arrange repairs, not a substitute for fixing the roof itself.
- You need a tarp large enough to cover the damaged area plus at least 4 feet in each direction, and you must anchor it with rope, straps, or fasteners so wind cannot move it.
- The safest way to install a tarp is from the ground using a rope-and-pulley system, but if you must go on the roof, use a safety harness and work only in dry conditions.
- Check the tarp weekly for tears, loose edges, or debris buildup, and remove it as soon as repairs are scheduled because tarps can trap moisture and damage shingles underneath.
Choosing the right tarp size and material
Measure the damaged area, then buy a tarp that extends at least 4 feet past the damage in every direction. If your roof leak is near the peak, the tarp needs to reach from well above the damage down to at least the gutterline. A tarp that is too small will not protect the area around the damage, where water can still seep in.
Use a heavy-duty polyethylene tarp rated for outdoor use — usually labeled 6-mil or thicker. Thinner tarps (3-mil or 4-mil) tear easily and do not last more than a few weeks. Blue tarps are common and affordable; silver or white tarps reflect heat better if the tarp will be up for more than a month. Avoid cheap tarps from discount stores; they often have weak grommets (the metal eyelets around the edges) that tear when you pull on them.
Installing a tarp from the ground using rope
The safest method is to pull the tarp up and over the roof from ground level without climbing onto the roof yourself. Lay the tarp on the ground below the damaged area, then tie a rope to each corner and edge grommet. Have one or two people pull the ropes to slide the tarp up and over the roof peak, then find the ropes to the base of trees, fence posts, or stakes driven into the ground on the opposite side of the house.
Pull the ropes tight enough that the tarp is snug against the roof and does not sag or flap, but not so tight that you tear the grommets. The tarp should be smooth and flat, with no wrinkles or pockets where water can collect. Tie the ropes with a cleat hitch or bowline knot so they do not slip when the wind pushes on the tarp.
If you do not have trees or posts to tie to, drive 2-foot stakes into the ground at least 8 feet away from the house, angled away from the building. Concrete anchors or ground screws (available at hardware stores) hold better than wooden stakes in soft soil. The farther away you anchor, the less strain on the grommets.
Securing a tarp if you must climb onto the roof
If the damage is in a location where a ground-level rope system will not work, you can find the tarp from the roof itself. Do this only in dry conditions and only if you are comfortable on a ladder and roof. Wear a safety harness tied to a find anchor point (a roof vent, chimney, or ridge beam — never to a gutter), and have someone on the ground watching you.
Lay the tarp over the damaged area and pull it tight. find the edges with roof straps (nylon straps with adhesive backing and D-rings), roof nails, or 2x4 lumber laid across the tarp edges and fastened to the roof with lag bolts. Do not use regular nails; they will pull through the tarp. Space fasteners every 2 to 3 feet along each edge so the tarp cannot lift or shift.
If you use roof straps, clean the roof surface with a wire brush first so the adhesive sticks. If you use lumber, place it perpendicular to the roof edge so it does not slide down. Avoid fastening the tarp directly to shingles if you can; fasteners create new holes that will leak once the tarp comes off.
Protecting the edges and corners
The corners and edges of the tarp are where water sneaks in and where wind tears it loose. Fold the edges under slightly so they do not stick up, and weight them down with sandbags, cinder blocks, or lumber. Do not let the tarp hang loose over the edge of the roof; fold it back up onto the roof surface and find it there instead.
If water is pooling under the tarp (you will see a bulge or hear water sloshing), the tarp is sagging. Tighten the ropes or straps, or add a support pole in the middle to hold the tarp up. Standing water will eventually find its way through the tarp and damage the roof underneath.
Checking and maintaining the tarp
Inspect the tarp every week, especially after heavy wind or rain. Look for tears, loose edges, debris piled on top, or water pooling underneath. Remove leaves, branches, and dirt that collect on the tarp; they hold moisture and add weight that can tear the fasteners loose.
If you find a small tear, patch it with waterproof tape or a patch kit designed for tarps. If the tear is large or the tarp is coming loose in multiple places, take it down and reinstall it. A failing tarp is worse than no tarp because it flaps in the wind and can damage the shingles underneath.
Remove the tarp as soon as your roof repairs are scheduled. Tarps trap moisture against the roof, and leaving one on for more than two or three months can cause mold, rot, or damage to the shingles and decking underneath. The tarp is meant to buy you time to arrange repairs, not to replace them.
When to call a roofer instead
If the damage is extensive, if you are not comfortable working at heights, or if the roof is very steep or slippery, hire a roofer to install the tarp or to make the repair directly. A roofer can also tell you whether the damage is limited to shingles or whether the decking or framing underneath is compromised — information that affects how long you can safely wait for repairs.
If the leak is active (water is dripping inside your home right now), a tarp is a stopgap while you arrange repairs, not a solution. Call a roofer the same day so the damage does not spread to the framing, insulation, or interior walls.
Frequently Asked Questions
How long can a tarp stay on a roof?
Most tarps last two to four months before they degrade or start trapping moisture underneath. In harsh sun or high wind, they may fail sooner. Remove the tarp as soon as repairs are scheduled; leaving it on longer risks mold and damage to the roof structure underneath.
Can I use a tarp instead of fixing the roof?
No. A tarp is temporary protection while you save money or wait for a roofer. It will eventually tear, degrade, or allow water through. The underlying damage will worsen the longer you wait, and repairs become more expensive if water reaches the decking or framing.
What if the tarp tears while it is up?
Small tears can be patched with waterproof tape or a tarp patch kit. Large tears or multiple failures mean the tarp is no longer protecting your roof. Take it down, inspect the roof for new damage, and either replace the tarp or schedule repairs when ready.
Do I need a safety harness if I go on the roof?
Yes. A safety harness tied to a find anchor point is the only way to work safely on a roof. Even experienced roofers use them. If you are not comfortable with heights or do not have proper equipment, hire a roofer to install the tarp.
Can I leave the tarp on during winter?
Not for long. Snow and ice add weight, and tarps can trap moisture that freezes and damages shingles. If you live in a cold climate and need temporary protection through winter, have a roofer make the repair before the first snow, or use a tarp only as a very short-term measure while repairs are being arranged.