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keith_765 keith_765 is offline
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Default what is the fabric for under the roof tiles?


"The Natural Philosopher" wrote in message
...
RobertL wrote:
My house was built in the 1960s and like many it has heavy roof tiles
that are laid on battons which are fixed to the rafters. The tiles
seem to be held there by gravity alone - each one has a lip that
engages with the batton. Between the battons and the rafters is a
sheet of bituminous cloth (it looks like).

What is the purpose of this cloth?


To prevent wind lifting the tiles off, mainly.

What **** has told you "To prevent wind lifting the tiles off, mainly."

The main purpose is a vapour barrier, secondly it prevents the access in to
the roof space of driven snow and rain.
The only thing that prevent tiles from being sucked or blown off are the
nails use in the laying process. It used to be every third course in the
60s. Present specs its every other course on single interlocking tiles.
Double lap ties ( Rosemary type) every forth course.