Chapter one
Mathematical tiles on the High Street
A tile made to pass for brick, hung on a timber-framed house, has to be matched by eye as well as by size.
The council's summary of the conservation area names clay tiled roofs, sandstone, Horsham Stone roofs, mathematical tiles, tile hanging and stucco as the materials that give Lindfield its character. Of those, the mathematical tile is the odd one out. It is a clay tile moulded so that, once hung on a timber-framed wall, it reads as brickwork. Behind it sits the High Street's stock of over forty medieval and post-medieval timber-framed houses. A roof on one of them has a heavier duty than its size suggests, because the frame is the structure, and water reaching it does damage that a ceiling stain only hints at.
At a glance
- The High Street has over forty timber-framed houses
- Mathematical tiles imitate brick when hung on a wall
- A 1995 Article 4(2) direction covers part of the village

1.1 Matching a tile that is made to pass for brick
Replacement is not simply a matter of size. A mathematical tile has a flat face, a colour range and a joint that all have to read the same as the wall around it, so we hold samples against the existing wall in daylight before anything is ordered. Hung tiles are nailed to battens over the frame, and the places they meet the roof, a window or a chimney are joints where lead has to be dressed under the tile and over the slope. On a listed house, consent turns on matching materials as well as looks. A tile that is a few millimetres off in thickness, or a shade too uniform, stands out in raking light, and replacements that are not a good match tend to age differently from the tiles around them.

1.2 The 1995 direction
An Article 4(2) direction was made in 1995 for part of the conservation area, with the aim of controlling unsympathetic alterations to dwelling houses. Whether the direction reaches a particular High Street house, and what it takes away there, is something to settle with the Mid Sussex planners, and before a covering or wall finish changes, not after. Stucco, the smooth render found on some fronts, adds one more junction to watch, because a crack where render meets a roof edge lets rain in behind it. Matching repairs to a roof are generally outside planning control, since they leave the outward appearance unchanged. Our roof planning permission guide explains where the edges lie, and our pitched roofing page covers the repair work itself.

Fig. 1 On the survey Hung tiles lifted and stained at a wall junction






