Are '80's Marley tiles prone to porosity?

grumbler

FFHillbilly said:

 anyone would find that out once they realise most of them break when trying to remove them carefully!

My roof is 30 y.o. I repaired the guttering and fascia recently and removed completely 2 bottom rows of tiles to add a strip of new felt and a felt support tray. Not a single tile broke. This is despite removing them from the bottom  of the roof is less natural than removing from the top.
ETA, not sure about Marley, but they are concrete.

stuart45

Single lap concrete tiles are the easiest ones to remove. Especially the older roofs, as the nailing regs weren't so strict back then, and a lot just say on the battens.

plumb1_2

stuart45 said:

Single lap concrete tiles are the easiest ones to remove. Especially the older roofs, as the nailing regs weren't so strict back then, and a lot just say on the battens.

Ya you’ll be lucky if 1 in 6 rows are nailed.

plumb1_2

fwor said:

Agreed - some will break and will have to be replaced, but ditching them all is a lot of tiles to throw away.

I confess I haven't counted and it's dark out there now, but I guess there must be 500 tiles on there. So that's at least a couple of grand's worth of tiles to chuck out, plus the cost of enough skips to take them away. It seems a bit wasteful if they are maybe only half way through their probable lifespan?

You have a lifespan of 0-95 but you might kick it at 45?

For a couple of grand it’s not worth using old tiles, your already paying for scaffold,skip new felt.
Reusing slate tiles a different matter.

FFHillbilly

fwor said:

Agreed - some will break and will have to be replaced, but ditching them all is a lot of tiles to throw away.

I confess I haven't counted and it's dark out there now, but I guess there must be 500 tiles on there. So that's at least a couple of grand's worth of tiles to chuck out, plus the cost of enough skips to take them away. It seems a bit wasteful if they are maybe only half way through their probable lifespan?

last time I got a roof done(2019) they were £1.10 and I think I needed 570 tiles. so £627. do you think it's worth taking the risk for that much? if you put new ones on, you'd ensure that you won't have to do anything with the roof for another 40 years in my opinion, but if you put 40 year old tiles back on then in 20 years you are going to have to get scaffold up and get roofers back to replace the then 60 year old crumbly ties
where are you getting that they are half their way through their lifespan? more like 4/5

fwor

It's a difficult balance, isn't it? Concrete is pretty durable - especially in any form that doesn't have steel reinforcement (which roof tiles don't). And concrete is something that is costly to make in energy terms, so I'd prefer not to throw a couple of tonnes of it away if I can help it.

I have a suspicion that a typical concrete roof tile has a realistic lifespan of well over 100 years but... it only takes a few of them to fail early to completely screw things up!

I confess I didn't realise that they were that cheap (my assumption was that they were more like £4 each). Now it's light I've had a chance to do a quick add up and discovered that I had underestimated the number needed by a long way and the actual is closer to 1200 - but even so it's not a big amount when you consider the cost of scaffolding and the labour needed to do the work!

ALAN_ASTLEY

My roof as only been on 27 years Marley Bold Roll have become porous, they are no longer made, been in touch with Marley they don't want to know even after i sent them an NFRC roof report stating the tiles were porous As anyone ever seen a fifty year written guarantee from Marley, i worked for Marley for thirty years and only saw two