"Zooologist" wrote in message
om...
Someone else has suggested re-tiling with a lower profile tile (as
well as replacing the felt underneath). Is this what low profile
tiles are designed for (ie specifically for roofs with a low angle)?


Simple answer, no. Standard natural slate tiles are normally used for most
roofing designs if the area model demands it. Preformed concrete or
clayware tiles do come in profile formats, and also premoulded hybrid tile
systems that are made of ground up natural slate and concrete or clay
mixtures, so these do have different format patterns for differing roof
pitches or border styles.

I don't think anyone has asked what type of tiles you have on the roof, so a
low profile tile might help if you do have a preformed pattern tile system.
For standard natural slate though, it doesn't really matter. All natural
slate has the same sort of properties no matter what the roof angle.
Natural slate will only differ in the headlap required for different roof
angles. The headlap is the amount that the tiles overlap on each, and
slower slopes are normally set with tiles that are around half way over the
lower row. The headlap also helps in wind load strengths, and this is
usually worked out on the area of the country you're in and the rain fall
averages that are experience there.

The area you live in may also determine what material is actually used on
your roof covering and its design, so it might have been part of the shed
build permission to have a certain sort of tile on its roof. Aesthetically
pleasing for the area they call it, I think.