The short answer
Hip tiles loosen where their bedding has cracked, the gap beneath them lets in wind-driven rain, and the joint where hip meets main slope is where tiles slip first. Clay tiles themselves tend to outlast the fixings, so most hipped roofs need a repair to the angles rather than a new covering.
The Manor House beside Great Shefford's church shows what a hipped roof looks like: the south end slopes back to meet the long sides instead of stopping at a gable. It is an attractive shape, and a harder one to keep watertight, because three slopes are meeting along every hip.
Q1.1How are hip tiles held in place?
Each hip carries a row of curved tiles on top of the junction. Originally these sat in mortar. When the mortar cracks, tiles shift, and water runs under them into the roof. Today a hip tile is held by a metal hip iron at the foot, by clips or screws along its length, or by a dry-fix system that does without wet mortar, and BS 8612 is the standard such systems are tested against.
Q1.2Why does the angle where slopes meet leak?
Plain tiles around a hip are cut and laid so that water runs away to either side. Where a tile has cracked or slipped, rain collects in the angle and runs under the row below. A few replaced tiles and a refixed hip usually cure it, and the survey photographs show exactly which ones.
Q1.3Can new clay tiles match the old ones?
Clay ages from a bright orange to a deep, mottled red, and a new tile set among old ones stands out for years. We match for colour, size and camber, mix new tiles with reclaimed ones where the roof allows, and keep the blend even across the slope. For the larger picture, our pitched roofing page explains when a tiled or slated slope can be patched and when it needs lifting and starting again.
If a hipped roof is also a roof you would like to look the same afterwards, say so at the survey and we will plan the work around that. Mention any tiles you have kept in the garage or the shed, too: spare originals are the best match there is.