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Can I Use Roofing Cement to Fix a Leak Temporarily?

Last updated October 31, 2026

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The short answer

How Roofing Cement Works

Roofing cement is a thick, tar-like compound that seals gaps and cracks in roofing materials. You can spread it over a small hole or split to block water from entering your home. For it to stick well, the surface must be clean and dry. If the roof is wet or damp, the cement will not bond properly, and the leak may continue.

This patch is a stopgap measure, not a long-term solution. Sun, rain, and temperature changes cause the cement to crack and peel over time. In a humid subtropical climate with hot summers and hurricane season, the patch may fail sooner than you expect. Plan to have a proper repair done soon.

Steps to Apply a Temporary Patch

First, locate the leak from inside your home, then trace it to the roof. On a dry day, clean the area around the leak with a wire brush to remove loose debris. Apply a thick layer of roofing cement over the hole, extending it a few inches beyond the damaged spot. Press a piece of roof repair fabric or a patch of flashing into the cement, then cover it with another layer.

Smooth the edges so water can flow over the patch without pooling. Check your work from inside after a rain to see if any water still comes through. If the leak persists, the damage may be larger than it appears. Keep monitoring until a professional can assess the roof.

  • Work only on a dry, sunny day for proper adhesion
  • Spread the cement at least two inches past the damaged area
  • Use a putty knife or trowel for a smooth, even layer
  • Reapply if the first coat cracks or separates
  • Check the patch after heavy rain or wind
  • Keep a tarp and nails handy for larger emergencies

When Roofing Cement Is Not Enough

Roofing cement works for small holes, cracked flashing, or loose shingle edges. It will not fix a large hole, a sagging roof, or widespread shingle damage. If water is pouring in or the ceiling is bulging, a patch will not hold. You need a more substantial temporary solution, such as a tarp, until a roofer can make the repair.

Also, if the leak has been active for a while, water may have soaked into the roof decking, insulation, or drywall. That hidden moisture can lead to mold and rot. Even after you patch the roof, you still need to dry out the affected areas inside your home to prevent further damage.

Why You Need a Proper Repair Soon

A temporary patch can buy you time, but it will not last. Roofing cement degrades with exposure to sun and weather, especially in a hot, humid climate. The longer you wait, the more water can seep in and damage the structure of your home. A professional roofer can assess the full extent of the leak and replace damaged shingles, flashing, or underlayment.

After the roof is fixed, you may still have water damage inside your home. If drywall, insulation, or wood framing got wet, those materials need to be dried or replaced. Local water damage pros can inspect and clean up any affected areas to prevent mold and structural issues.

Water Damage Inside Your Home

Even a small roof leak can cause significant water damage over time. Water can travel along rafters and walls, soaking materials far from the visible stain. If you notice a musty smell, discolored drywall, or peeling paint, moisture is likely present. Acting quickly to dry the area reduces the risk of mold growth.

If the leak has been going on for a while, you may need professional help to dry out walls and ceilings. Water damage inspection can identify hidden moisture and guide the cleanup process. For extensive water damage, consider reaching out to local water damage pros for a thorough assessment and drying plan. Policies vary, and your insurer decides what is covered.

Policies vary, and your insurer decides what is covered.

  • Move furniture and valuables away from the leak area
  • Place a bucket or tarp to catch dripping water
  • Dry wet carpet, rugs, and upholstery quickly
  • Remove wet drywall if it is sagging or crumbly
  • Use fans and dehumidifiers to speed up drying
  • Watch for mold growth in the following weeks

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Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

How long does roofing cement last as a temporary fix?

Roofing cement can last a few weeks to a few months, depending on weather and the size of the leak. In hot, humid climates, it may crack sooner. Check the patch regularly and plan for a permanent repair as soon as possible to avoid further damage.

Can I apply roofing cement in the rain?

No, roofing cement needs a dry surface to stick properly. Applying it in the rain or on a wet roof will not seal the leak effectively. Wait for a dry day or use a tarp as a temporary cover until you can apply the cement correctly.

What if the leak continues after I apply roofing cement?

If the leak continues, the damage may be larger than the patch covers, or water may be entering from another spot. Reapply the cement on a dry day, but if the problem persists, you need a professional roof inspection. Also, check inside your home for water damage that may need cleanup.

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