On Sun, 12 Aug 2018 18:03:24 +0100, alan_m wrote:

One of the shops at the end of my street was roofed with some kind of
composite slate look-a-like material. Although the same size as a slate
they were around 50 to 75% of the weight. The roof looked good when
first done but 15 years later it looked if the roof had been installed
50+ years ago. While the "slates" were still in good condition the nails
used had presumably rusted away and many slates were slipping/dislodged.

The life expectancy of a roof is dependent on the roofing material and
the standard of workmanship installing it.

Well, if you're employing some damn fool that's using plain old steel
nails for this purpose, you can't really blame the material the 'slates'
are made of.



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