Garage roof leaks when it rains

Question

Getting water inside the garage whenever it rains. Not sure if it’s coming through the roof covering or around the edges. What should I be looking for or do?

James · Answer

Best thing to do it get a professional in to do a survey. If you do want to check this yourself, if its a bad leak youll likely see where its coming from when it is raining.

Robert · Answer

would be happy to come and take a look, but of course we need to inspect on wet  day to know where the water is coming from

Wayne · Answer

Sound like the lead or lack of lead may be the issue may I ask what you roof is made of?

Henry · Answer

It all depends on if the garage is attached to the house or not really !

And what material the roof is made from !

If attached to the house it would be wise to consider the abutment flashings !

If fully detached we would start by checking any laps (where roof coverings overlap/meet)

Ben · Answer

1. Check the Roof Covering
Look for:
Loose, cracked, or missing tiles/shingles
Blistered or torn felt (on flat roofs)
Visible gaps or holes
Pooling water on a flat roof
If water isn’t draining properly, it can find the smallest weakness.

2. Inspect the Roof Edges (Perimeter)
This is one of the most common leak points, especially on garages.
Check for:
Gaps where the roof covering meets the wall
Loose or rotted fascia/trim
Cracks in mortar (if it meets brickwork)
Failed sealant along edges or upstands
Water will often run along the edge and sneak inside even if the main roof surface is fine.

3. Check Flashings
If your garage roof meets another wall or structure:
Look for lifted, cracked, or poorly sealed flashing
Check if the lead or metal flashing has come away
Flashing failures cause leaks right along the inside edges.

4. Look Inside the Garage
Check internally for clues:
Wet patches or staining on the ceiling or top of the walls
→ helps show where the water is tracking from
Damp on one side only
→ often an edge or flashing issue
Drips at random points
→ more likely the roof covering itself

5. Check the Guttering & Drainage
Overflowing water can be forced under the edge.
Look for:
Blocked or sagging gutters
Downpipes overflowing
Water running down the wall where it shouldn’t

6. If It's a Flat Roof
Pay extra attention to:
Cracks in the felt
Lifted edges
Split joints
Soft/“spongy” areas (sign of water trapped underneath)
Flat roofs often leak at the edges or where two layers join.

Harvey · Answer

You should be looking on all over laps of felt any cracks in the felt the ends aren’t normally the problem plus standing water on a flat roof isn’t good

Dylan · Answer

This is  a tricky one primarily  due to the fact that there are so many types of roofs , however look for the obvious clues such as holes or thin areas where it seems to be leaking. A product called Crymapol is a fibre glass paint that can be applied in damp conditions is a very good short term fix . Hope this helps

Ashley · Answer

What you need to do is have a look if you can fine the problem or get a company to come and have a look and get a quote.

Saqib · Answer

Let some offer inspect it and tell them to give you all possible solutions. 
You can think fix it according to your budget

Garage roof leaks when it rains

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