In article ,
Nightjar wrote:
On 12/08/2018 23:19, Cursitor Doom wrote:
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.

If they are saving costs by using composition slates, it is not very
likely they would pay the extra for copper nails.

Lots and lots round here using artificial slates. Many date from when the
council were dishing out grants towards such things - about the '80s. And
can't say I've noticed any slipping. But of course the council insisted on
it being done properly, before parting with the money.
One or two have discoloured badly. But most look as good as new. Likely
different makes.

--
*I don't believe in astrology. I am a Sagittarius and we're very skeptical.

Dave Plowman London SW
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