The recent storm destroyed about half a dozen Marley Redland Stonewold
concrete tiles on a bungalow. The broken tiles need to be replaced. Is
it likely that the remaining tiles which are about 40 years old, will
break if someone moves about on the roof? The roof has a shallow slope
so in dry weather you could walk up it quite easily.
Another problem is that the bottom plastic verge was blown away. Buying
a single matching one is nearly impossible. As it happens the verges
above it don't match the ones on other side. Not that you would notice.
Even though you can walk on it, spread the load with a pair of battens
or a crawler or whatever (that is secured so it/they can't slip.) If you
have a long piece of foam rubber put that under the battens. Otherwise
use a duvet. If you do walk on these tiles put the flat of your foot on
the joints (overlaps) between adjacent tiles, not in the middle of a
tile. If the tiles are nailed cut the nail heads off with a multitool.
My experience with pantiles is that the shallower the angle and the more
they have been walked on the shorter the remaining life of the tile. The
ones which failed first by spalling apart under freeze thaw frost action
were on the shallowest north facing part of the roof along the line that
TV engineers and chimney pot fixers walked up to the chimney apex.
Just walk on the overlaps and where the trusses or rafters are if you
weigh 20 stone though.
None of them should be nailed, they just hook over the battens and
interlock but beware that you won't get a colour match unless you
find some secondhand ones.
also, they are now made the same colour and sprayed to get the actuak
colour whereas 40 years ago the colour was part of the concrete mix.
Also, the design of the nibs has changed slightly which shouldn't be
if in doubt move some existing tiles from the rear to the front to
match existing and put the new ones round the back where you won't
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