The short answer
Leaks on Victorian and later brick houses usually start at the joins, not in the middle of the slope: flashings at the stack, loose ridge tiles, a blocked valley or a failed porch roof. Finding which one it is takes a proper look, and the cure is often smaller than people expect.
When a stain appears on a ceiling, the instinct is to blame the tiles. Often the covering is fine, and the water is getting in where two parts of the building meet. The Victorian manor of 1865, with its tall brick stacks and patterned walls, shows the sort of detail that tends to need attention.
Q3.1What goes wrong around a chimney stack?
Flashing is lead dressed over the joint between stack and slope. Over time it lifts, cracks or loses its pointing, and rain runs behind it. The mortar joints of the stack weather too. Repointing, fresh lead and sometimes new flaunching, the sloping mortar that holds the pots at the top of the stack, cure most of these leaks without touching the roof covering.
Q3.2Do ridge tiles need replacing when they loosen?
Not necessarily. The 2014 revision of BS 5534 stopped treating mortar alone as enough to hold ridge and hip tiles, so mechanical fixings go in as well. If the tiles are sound but the bedding has failed, we can lift, re-bed and fix them again, or fit a dry-fix system that has passed the BS 8612 tests. Our ridge, verge and dry-fix page sets out the choice. The verge, where the covering finishes at a gable end, is the part that takes the wind first.
Q3.3Why do porch and garage roofs fail first?
They are often flat or low-pitched, and a flat roof has a shorter working life than a pitched one. The covering splits, water ponds on it, and the fault shows up in the room beneath. A small roof like this is frequently better recovered than patched, and the survey report spells it out.
The pitched roofing page covers the main roof in more detail.