Why is my roof leaking?
Check when the leak occurs and whether the wet patch is below a slope, junction or valley.
Read guide →DampUK practical guides
Roof leaks
Rainwater is supposed to shed from the covering into gutters. Trouble develops where laps, flashings and junctions are interrupted or water is held back.
Not sure of the cause? Use the leak finder →
Questions answered in this section
Can one slipped slate cause a roof leak?
A single displaced slate can expose the underlay or leave a direct path for wind-driven rain.
Read guide →Can cracked roof tiles let water in?
Look for cracks, broken nibs, poor laps and whether adjacent tiles still shed water.
Read guide →Why is water coming in around my chimney?
Lead flashings, back gutters, pointing and chimney masonry each need separate inspection.
Read guide →Can defective lead flashing cause a leak?
Check whether the flashing is correctly chased, lapped and dressed without relying on sealant alone.
Read guide →Why is my roof valley leaking?
Valleys collect runoff; obstructions, deteriorated linings and inadequate laps can concentrate water.
Read guide →Can ridge tiles cause a roof leak?
Consider defective mortar, dry-ridge fittings, wind exposure and water travelling along the ridge.
Read guide →Why does my roof leak only in heavy rain?
High rainfall can reveal poor outlets, shallow laps and overflowing roof details that cope in light rain.
Read guide →Why does my roof leak only when windy?
Wind can drive rain under laps and against flashings that normally shed vertical rainfall.
Read guide →Can a roof leak happen without missing tiles?
Hidden cracks, defective junctions and condensation can all produce wet marks without obvious gaps.
Read guide →Why is my roof window leaking?
Differentiate failed glazing seals, flashing kit defects and condensation on cold reveals.
Read guide →Can roof underfelt stop a leak?
Underlay is a secondary layer, not a substitute for sound coverings and correct drainage.
Read guide →Why is my roof leaking around a dormer?
Check dormer cheeks, apron flashings, flat roof edges and window interfaces.
Read guide →Can moss cause a roof leak?
Moss may obstruct drainage paths but is not itself proof of a failed roof covering.
Read guide →Why are water stains appearing near the chimney?
Old soot salts and condensation can resemble rain penetration; look for timing and location.
Read guide →Why is water entering at the roof verge?
Inspect verge tiles, mortar bedding, dry verge components and exposed underlay edges.
Read guide →Can missing pointing cause roof leaks?
The location of the pointing matters: some mortar joints are weathering details, others are not primary waterproofing.
Read guide →Why is my loft wet after rain?
Locate whether moisture is dripping from covering defects or collecting as condensation below the roof.
Read guide →Why is a ceiling stain far from the roof leak?
Water can track down rafters, felt, cables and ceiling joists before becoming visible.
Read guide →What causes leaks near roof hips?
Hip tiles, end caps, adjoining slips and laps deserve careful examination.
Read guide →Can a badly fitted aerial cause a leak?
Roof penetrations and fixings can damage the covering or create unexpected water routes.
Read guide →Can solar panel installation create roof leaks?
Inspect disturbed tiles, roof hooks, cable penetrations and flashing details, not the panels alone.
Read guide →Should you replace a whole roof for one leak?
Ask for evidence that the general covering is failing rather than only one accessible detail.
Read guide →What does a roof leak repair quote need to include?
Specify fault location, safe access, materials, junction detail and making good, rather than a vague treatment.
Read guide →Can frost damage roof tiles?
Freeze-thaw damage can break vulnerable tiles, particularly where moisture is retained.
Read guide →Why is a roof leaking after repairs?
The original cause may have been missed or the repair may have altered the water path.
Read guide →Why are ceiling stains worse after snow?
Snow and slow thawing can expose details differently from ordinary rainfall.
Read guide →Can blocked roof valleys cause ceiling leaks?
Debris can hold water back and redirect it beneath otherwise sound laps.
Read guide →How can you tell if a slate roof needs repair?
Look at fixings, slipped slates, overall condition and evidence of repeated failures.
Read guide →Are roof leak sprays and sealants reliable?
Temporary coatings rarely replace diagnosing defective slates, flashing or water-management details.
Read guide →