Why do tile roofs fail at the fastening first?
Tile is heavy and durable, but it is held by nails and fixings that corrode and loosen. When the fixing fails, the tile slips or cracks, and water reaches the structure beneath.
Brief 30 says the fastening system normally fails before the tiles do, through corroded nails and copper nails not adequately driven, which pull out of the structural members. A tile on a failed fixing moves underfoot or in the wind, can crack against its neighbor and lets water in at its head.
A tile roof can look sound from the ground while the attic shows trouble. The technician checks the fixings from below, where the nail points can be seen, and the repair starts there rather than on the surface.
Which flashing should be used on a tile roof?
The Park Service's guidance for historic clay tile calls for copper or lead-coated copper, or terne-coated stainless steel, with corrosion-resistant metal ideally at least 26 gauge, running at least 12 inches under the tile. The same principle holds wherever a flashing meets a wall.
Flashing keeps water out where the tile stops. A flashing that is too short or too light lets water run behind it, and metals that do not suit each other can corrode where they meet. The Park Service's principle is matched or isolated metals, with non-ferrous fixings.
On a tile roof with several planes, every junction is a flashing detail. Chimneys, dormers and walls get the same check as the main valley, so the repair does not leave a short run of old flashing beside new work.
Can a tile roof be repaired without replacing it?
Usually, when the tile is sound and the fixings and flashings can be renewed. Repair is the usual outcome where a roof has a few broken tiles or a failed valley. Replacement is for a roof where the tile or the structure beneath has failed across wide areas.
A roof with sound tile and corroded fixings is renewed fixing by fixing. A roof where the tile has cracked across many slopes, or where the structure under it has been weakened by long water exposure, needs a wider scope, and the attic check decides which applies.
Nothing here assumes a particular tile's age. The repair is aimed at the detail that usually fails first, which is the fastening and the flashing.
Does a tile repair need a permit?
It depends on the scope and the building department for the address. In Stamford, the city says ordinary repairs do not need a permit, while larger roofing work runs through its own track. Other towns set their own rules, so the department for the address is the one to ask.
Stamford's Building Department has a roofing track, and its guidance says ordinary repairs to structures do not need a permit. The FAQ is dated, so the homeowner should confirm the current position before work starts. A roof permit issued without a building permit needs a final inspection called in before a certificate of approval can issue.
On a historic house, the building department may not be the only authority with an interest in the roof. The authority to ask about a historic property is the one for the address, and this site does not say whether any property is in a historic district.
What moves the cost of a tile repair?
Cost follows how many tiles and fixings are involved, how easily the roof can be reached and what the flashing and the structure beneath the tile need. The price is explained and approved before work starts, and this site prints no figure.
Pitch and height change the work. A steep tile roof on a large house needs more care in walking, more staging and more time to lift and reset each tile. Multiple planes and valleys add joints to flash, and each chimney or dormer adds more.
Under the tile is where the surprises are. Corroded fixings, short flashing and damaged structural members only show once the tiles are lifted, and nothing is added to the scope without the homeowner's approval.