Roof Leak – Top 10 Most Common Reasons

Roof Leak – Top 10 Most Common Reasons

Roof Leak – Most Common 10 Reasons

Leaking Roof

Roof Leak – Ceiling Water Stains


Roof leaks can cause significant damage to a home if the underlying cause isn’t discovered and repaired promptly. Since water can travel outward from the point where a leak occurs, it may be difficult to pinpoint the exact cause. Check your roof for some of the most common causes of leaks to stop an existing leak or to prevent future problems.

Leaking Roof

Roof Damage – Aged Roof




Roofing materials deteriorate with age and become less effective at keeping water out. Temperature fluctuations and weather conditions may cause roofing materials to become brittle and crack over time. Exposure to direct sunlight can melt the bitumen that seals roof felt together.

Roof Leak - Old Worn Motar Flashing & Slipped Tiles

Roof Leak – Old Worn Motar Flashing & Slipped Tiles



Debris such as twigs, leaves or bird droppings can trap water against the roof and allow it to seep in by capillary action. It’s important to keep the roof clear to allow water to run off quickly. Pruning & trimming overhanging tree branches will make it easier to keep your roof free of debris.

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Roof Vent – Wrong Size


Roof Vents

It’s important for any ingress through the roof sealed properly to prevent leaks. Inspect the gaskets around vent pipes for cracks or gaps and check for missing nails. Plastic vents may crack after years of exposure to the weather.


Roof Leaking - Lead Flashing Defect

Leaking Roof – Caused by Lead Flashing Defect


Lead and metal roof flashing seal roof cavities where large amounts of water run down or where ingress may occur. Flashing is sited where the roof joins, typically where a chimney penetrates the roof and around the edges of skylights or back additions. Flashing may slide out of place if not secured correctly and mortar may dry and crack over time.

Roof Leak Slipped Ridge Tiles Missing Broken

Roof Leak Slipped Tiles Missing Broken



Ridge Tiles / Caps

The ridges cover the gap at the peak of a roof where the two slopes meet. Often contractors who use rope and harness systems without protecting the ridge cap can inadvertently create holes in the roofing material, allowing rain to enter.

Leaking Roof - Blocked Gutters

Roof Leak – Blocked Gutters

Gutter Damning

Gutter occurs when they are clogged with leaves or other debris that can slow the water flowing off the roof, giving it time to soak in the building fabric. Gutter covers can help keep gutters clear of debris to ensure that water flows freely and quickly off the roof, but beware these should be fitted only when recommended by a qualified roofer as they can cause more issues than they resolve at times.

Intrusions or Holes

Holes remaining after the removal of a TV antenna or some other rooftop installation can draw water into the house. Inspect the roof after any work is done on your property for intrusions and seal any that you discover.

Trapped Water Under Felt

Leaking Roof – Caused by Felt Roof Defect

Excess Moisture

Upper roof gutters that drain directly onto a lower roof can lead to the lower section becoming overwhelmed with rainwater, which can cause leaks. Extend the downpipe to the next gutter or down to the ground instead where possible

Water Damage Stains

Roof Leak – Water Damage



Roof Leak - Old Tiles Brittle Cracked Slipped

Roof Leak – Old Tiles Brittle Cracked Slipped

Missing Tiles

Strong winds can rip up tiles from the roof, and you may have an exposed area where you can’t see. Climb a ladder where safe to do so to inspect hidden areas and check for gaps or slipped tiles.

Roof Damage

Roof Leak – Broken Interlocking Tile


If the roof slope is too shallow, wind can lift tiles and drive rain underneath. Ensure that your roofing materials are appropriate for the roof pitch and have been installed properly.

Why not get your roof serviced today or call us and we’ll arrange a visit by one of our surveyors?

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