Roof leak

How to find and fix roof leaks

No one wants a leaky roof in their home. As such, you should know how to find and fix roof leaks as early as possible.

If left unchecked, roof leaks can cause mould and rot throughout your house. They can also be an invitation for pests such as termites or rats to enter your home.

Thus, our blog examines the causes and signs of roof leaking, as well as how you can fix them.

How to find roof leaks

1)      Know the causes of roof leakage

By knowing what causes a roof to leak, you can be proactive in stopping them.

Roof leaks are generally caused by some form of defect or damage around your roof.

Storms and high winds can damage or dislodge the shingles on your roof, for example.

Furthermore, as your roof ages, the material it is made of will deteriorate. For example, flashing can rust or slip out of place.

Gutters are a major source of leaks if they become clogged. A clogged gutter causes water to pool up and eventually damage your roof.

Openings in the roof such as chimneys and skylights can be susceptible to leaks if they are damaged, old or improperly installed.

Water refracts light, so you should be able to see it easily enough if it is there.

clogged gutters

2)      Check the attic or roof void

Exactly how to find and fix roof leaks depends on where the leak is.

One of the easiest places to spot leaks is in the attic or roof void.

Take a ladder and torch (ensuring you have a spotter for the ladder) and conduct a visual inspection.

If you see stains, dark spots or dripping water you’ll know there’s a leak somewhere.

If insulation is wet as a result of a leak, you can easily follow the damaged area back to the entry point of the water.

3)      Inspect the roof

If you do not have an attic or accessible roof void, your first step should be to look at the roof directly.

Alternately, you should follow up your inspection of the roof void or attic with an inspection of the roof itself.

Look at the roof from uphill or take a ladder and go up onto the roof to examine it.

Ensure you go up during the day when there’s plenty of light and you can easily see any issues.

4)      Examine the underside of the roof

Make sure to look in harder to spot places such as the soffit. These can leak as well, causing moisture damage around your home.

You might also have vents near the ridges or gable ends of the roof.

Inspect these as well, as the seals around these vents deteriorate over time, allowing rainwater to spread.

5)      Pour water on the roof in dry weather

If you are looking to expose leaks in your roof, you don’t need to wait for the rain.

Instead, get a bucket of water or hose and wet the roof section at a time. Make sure it has not been raining recently and the area is dry.

While you do this, have a friend below check the roof from underneath. They can then check for signs of leakage.

Obviously, the roles can be reversed, and you can do the examining while your friend wets the roof.

How to fix a roof leak

After you find the leak in your roof, you should consider fixing it before it causes too much damage.

Just how to fix it will vary based on what area is leaking.

Fixing damaged or loose shingles

If your leak comes as a result of a damaged or loose shingle, you have two options.

You can nail the shingle back in place and use adhesive to install the loose shingle back firmly in place.

Alternately, remove the nails holding in a damaged shingle in place. Loosen the adhesive and use a scraper, pry bar or claw of a hammer to lift and pull it away.

Following this, place the new shingle back using nails and adhesive.

roof shingle damage

Using Polyethylene sheet to cover leak

You may also wish to put a polyethylene sheet under the new shingle before installing it to prevent further dripping.

Polyethylene is a type of plastic that is resistant to moisture.

To install a Polyethylene sheet over a vulnerable part of your roof, you should first remove the damaged shingle as normal.

After this, put a polyethylene sheet over where the leak is and then install the new shingle.

Small cracks

For smaller cracks, you can use roof sealant applied with a caulking gun.

Do not rely too much on roof sealant as it is not as effective for major issues like a damaged shingle.

Roof Rolling Damage

Roll roofing is a less expensive alternative to roof shingles.

It involves taking a mineral surfaced mat and cutting it into strips. These strips make up the various portions of a roof, which are placed in a horizontal position.

This product is lightweight and less durable than shingles.

Roll roofing material

Leaks in roll roofing

Roll roofing experiences leaking in different ways than shingles.

Blisters and bubbles can form as a result of water and air collecting in spots.

Alternately, the material itself can split open completely.

Fixing leaks in roll roofing

To get rid of blisters and bubbles, carefully cut it away, making sure to only remove the top layer of the roofing.

Soak up the water using a dry rag, sponge or mop.

Make sure the wet spot dries and then go about fixing the new hole.

Apply roofing cement under the edges of the new hole. Do the same if you’re repairing a tear or spit in the material.

Cut a patch of roll roofing that is 30cm wider than the mended section. Place it over the roof cement, pat it down gently and then secure it with galvanised roofing nails.

To complete this, add a layer of roofing cement over the top, covering the nail heads.

If your roll roofing is asphalt, spread asphalt gravel over the cement to further protect the material.

Using these steps, you can find and fix roof leaks on a number of different roof types.


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5 replies
  1. Jack Wilson
    Jack Wilson says:

    Hi, there! No one wants to live under a leaky roof, if you suspect any leak and left unchecked it can cause damage throughout your home. This blog will help me further to find leaks in my roof. Neatly explained!

  2. Colleen Crawford
    Colleen Crawford says:

    Thank you so much for all the information! Roofing is one of the most important parts of a house. And it’s very helpful to know all the information on how to find a leak! Bookmarking it for future reference!

  3. Curtis Butler
    Curtis Butler says:

    I didn’t know that you could examine your attic in order to assess your roof’s condition. I remember my brother mentioning that he needs to find someone that fill fix his cracked roofing. He should consider finding a professional that can help him with the repair process.


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