Bitumen Sheet roofing

Bill - I can't answer the questions on the material, except that the big B & Q's round Edinburgh stock it - at least did so 6 months ago!

You'll need nails which are special in that they have a plastic cap on them. If the T & G is in good condition, I can't see any reason why you can't lay the sheet on top of the existing felt. You're only problem may be hitting a felt nail when you nail on the sheets.

It really is less requiring skill than laying felt. You'll get instructions off the Onduline website (I think ?!) which tell you how much overlap, etc.

Mine is a lean to shed about the same size and took me an afternoon with an assistant.

Rob

Use screws with a soft plastic cap, which forms a watertight seal against the onduline.

NT

I've done the tour of sheds. B & Q sell Coroline, which looks the same. They only have 4 sheets and no ridge pieces, but there is a 15% off offer.

Wickes offering is Onduline and they have plenty and also have ridge pieces, so I'll be trying to get them to price match.

Having read the brochures, there are only 2 things I'm not totally sure about. First is how to terminate the ridge at each end to form a seal up against the wooden sloping gable end fascia boards. And then there's the question of the damsons. Traditionally, I climb on the sloping roof to pick these. Am I right to assume this would be out of the question on this corrugated roofing on a solid roof?

I looked at both and bought Onduline. It seemed better quality and less flimsy. The nails are expensive and quite a lot are needed.

Fixing guide from here:

I dont really follow. As long as the ondu overlaps the gable end wall, all is well. You dont need a seal.

Cant say I've ever climbed on it. If you find its not upto it, you can always bung a board up there and stand on that.

NT

If, like mine, it's a full deck it'll depend on the strength of the deck (I can prop mine from inside) and the temperature: to warm and it'll be squashed; too cold might make it brittle, so if you pick damsons in Winter...

I use an offcut of 12mm WPB; on a gentle slope it'll stay in place held by a line of nails.