A roof leak must be treated as an emergency: even a minor leak can cause significant damage. This guide helps you identify the source of the leak and choose the right repair.
Signs of a Roof Leak
Inside the House
- Damp patches on ceilings or walls
- Water droplets falling from the ceiling
- Mould in the loft space
- Musty smell
Outside
- Broken or missing tiles or slates
- Deteriorated flashings
- Loose ridge tiles
- Blocked gutters
Common Leak Points
| Area | Frequency | Typical Cause |
|---|---|---|
| Ridge and hip tiles | 25% | Degraded mortar joints |
| Gutters and flashings | 20% | Corrosion, sealant failure |
| Penetrations (chimney, roof windows) | 20% | Defective flashing |
| Tiles/slates | 15% | Breakage, displacement |
| Valleys and verges | 15% | Poor waterproofing |
Emergency Solutions (Temporary)
Waterproof tarpaulin:
- Cost: €20-50 + €50-150 if fitted by a professional
- Duration: A few days to a few weeks
Sealant mastic:
- Cost: €8-15 per cartridge
- For small cracks or degraded joints
Permanent Repairs and Costs
Replacing Tiles or Slates
- Clay tiles: €30-60/m²
- Concrete tiles: €25-45/m²
- Natural slates: €70-120/m²
- Total for localised repair (2-5 m²): €250-600
Flashing Repairs
- Flashing repair: €150-400
- Gutter replacement: €20-45 per metre
- Chimney repointing: €200-500
Ridge Repair
- Cost: €40-80 per linear metre
Full Roof Replacement
| Roofing Type | Price per m² |
|---|---|
| Concrete tiles | €80-120 |
| Clay tiles | €100-160 |
| Natural slates | €130-220 |
| Zinc | €120-180 |
Prevention
Annual Inspection
- Condition of tiles
- Ridge and hip tiles
- Gutters (leaves, overflow)
- Moss growth
Professional inspection cost: €80-150
Gutter Cleaning
- Frequency: Twice a year
- Professional cost: €100-250
Preventive Moss Removal
- Every 3-5 years
- Cost: €10-25/m²
Insurance and Coverage
Covered:
- Water damage resulting from a leak
- Storm damage to the roof
Not covered:
- Lack of maintenance
- Wear and tear
Find a Roofer on tack.lu
More than 70 qualified roofers are listed on tack.lu in Luxembourg.
FAQ
How long does a roof last?
Clay tiles: 40-60 years. Natural slates: 80-100 years. Regular maintenance extends these lifespans.
Can you repair a roof in winter?
Yes, but avoid frosty periods and choose dry days.
Can a minor leak wait?
No. Even a small leak will worsen and cause hidden damage.
