Marley concrete roof tiles

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.
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Michael Chare

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Michael Chare wrote:

    Not unless they are damaged. These roof tiles are generally very easy to replace. I've done so quite a few times.
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On 31/10/2017 19:35, Capitol wrote:

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.
Bill
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On 31/10/2017 19:46, Bill Wright wrote:

+1
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.
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Regards,
Martin Brown
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On 31/10/2017 19:35, Capitol wrote:

+1
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 a problem.
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 see them.
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Andrew wrote:

    The ridge tiles also have a different profile.
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