Re-covering the shed roof

[David P]

We have a large shed with plywood topped by mineral felt roof. A branch has rubbed through the felt on the 'blind' side of the shed. Branch has now been removed but a patch is needed to cover damage. The felt has been on for at least 12 years and is probably approaching the end of its life so I'm thinking of doing a full recover.

As the felt generally is quite good though I'm toying with the idea of simply over-covering it with corrugated bitumen room sheets.

Has anyone used anything similar please and were/are there any problems? I did wonder if there may be a risk of the fixings tearing through the sheets?

Thanks all.

[G8PSZ]

I did exactly that 5 years ago, saved the shed & the corrugations in the sheets provided much needed ventilation, more than happy. The fixings were galv nails through a plastic collar with cap, fitted no problem, obviously fitted to the peaks not the valleys with no deformation of the sheet. Chris

[Kipper at sea]

[Midge]

Before you cover it, probably worth checking that moisture hasn't got under the damaged felt where it could be rotting through the roof timbers (these are usually tongue and groove and can be replaced easily if that has happened).

I used Coroline on an old single pitch shed roof many years back and it was pretty good, quick to use, and outlived the rest of the shed. I used an orangy brown colour at the time and the only downside is that is a bit too light and can look a bit scruffy when the colour wears off in places. Stick to dark colours if you use a product of that type - black, dark green etc. The nails for it come with colour matched plastic screw cover things so they don't pull through. I'd suggest using foam fillers under edges though to keep out wasps etc.

It does tend to look better on a shallower pitched roof though, so when my small apex shed needed doing a year or so back, I opted to re- felt that which I then coated in Thompson's roof seal.

HTH Midge.

[David P]

Chris, Midge, - Thank you! I've been looking at the Wickes products but see that Screwfix do Coroline. I'll check the prices carefully!

Kipper - sorry but you message can't be read for some reason.

[PeterC]

Depending on durability required, Onduline is a bit thicker than Corruline. Wickes have Onduline - well, I got some from there 2 years ago but now the site brands it as Wickes' own, so it could be anything!

[David P]

I think it could be a caliper measure to see how Wickes compares! My understanding is that the difference between Onduline and Coruline is 'not a lot' (technical term used there)but Wickes may have skimped on thickness

- though it didn't look that much different.

[PeterC]

When I was looking at the various ingredients for my shed, I went to B&Q first (have card). B&Q's 'wood' was total crap but I was v. interested in the corrugated, bitumastic roofing sheets. The Corruline felt a bit flimsy - bit like the roofing felt in these places

- and I wondered about being able to get a sheet up on to the roof without tearing it.

Went to Wickes: the wood was much less bad (hardly any sorting needed) and the Onduline was noticeably less floppy. I haven't looked at it since then.

[David P]

Noted - thanks.