How roof flashing keeps water out
Tiles and slates cover the main slopes, but junctions with walls, chimneys and adjoining roofs need their own weatherproof details. Flashings help manage water at those changes in surface. A sound covering can still leak if its junctions are defective, which is why a roof assessment should consider the details as well as the visible field of tiles.
Lead flashing and thermal movement
Roofing materials respond differently to temperature and moisture. A suitable flashing detail needs to account for movement, support and fixing rather than relying only on a watertight appearance on installation day. The appropriate method varies with the position and the material used. Its dimensions and connections should follow the specified system.
Diagnosing roof flashing leaks
Cracked or displaced lead can be a visible clue, but the cause may involve poor support or an unsuitable original detail. A surface patch may have a role in a particular temporary repair, yet it should not be presented as a universal long-term solution. Ask what the repair is intended to achieve and whether replacement is needed.
Coordinating flashing and roof repairs
If a chimney needs pointing or nearby tiles require replacement, those tasks may need coordination with the flashings. The quotation should explain which work is included and what remains outside the scope. This is especially useful when several contractors or building representatives are involved.
Requesting a roof flashing assessment
For leadwork on the Isle of Wight, tell us whether the problem is beside a chimney, along a wall or in a valley. Include your postcode and when the leak occurs. Useful information helps plan an assessment, but safe roof access and inspection are needed before a definitive specification can be agreed.