gravelld Posted July 31, 2018 Share Posted July 31, 2018 (edited) I replaced the roof on our shed four years ago. This year I inspected it and I noticed mould on the inside - I checked the top and there are lots of holes along with a lot of bird poo. Now I realise bird poo can be pretty nasty but I was hoping for more than four years. I have other sheds that appear fine. I used B&Q's bog standard felt. What should I do this time? Get a better felt or go for one of the plastic based coverings? Or simply paint over the holes - and maybe the whole roof - with one of the sealants (Everbuild "Black Jack")? Edited July 31, 2018 by gravelld Link to comment Share on other sites More sharing options...
Ian Posted July 31, 2018 Share Posted July 31, 2018 (edited) 16 minutes ago, gravelld said: What should I do this time? I'd over-felt it with a better grade of felt. (There's a big difference in quality & price between the cheapest grade of felt and a polyester reinforced top-sheet felt) Edited July 31, 2018 by Ian 1 Link to comment Share on other sites More sharing options...
ProDave Posted July 31, 2018 Share Posted July 31, 2018 I will never ever use felt for a shed roof again, Awful stuff with a hopelessly short life. I use the corrugated bitumen roofing sheets sold by B&Q and many others. One shed has had that for 10 years now and as good as new. 1 1 Link to comment Share on other sites More sharing options...
gravelld Posted July 31, 2018 Author Share Posted July 31, 2018 Reccos for a "better grade of felt"? Link to comment Share on other sites More sharing options...
Cpd Posted July 31, 2018 Share Posted July 31, 2018 As @ProDave says I would recommend corrugated Onduline, I did a summer house with it on the west coast over 20 years ago and it’s still going strong ! Cheep and easy to work and you can buy it of the shelf. Another vote for not using felt. Link to comment Share on other sites More sharing options...
joe90 Posted July 31, 2018 Share Posted July 31, 2018 As above I have used Onduline and it’s very good, however, a word of warning, if not supported properly it can get soft in the sun and sag. Link to comment Share on other sites More sharing options...
Ian Posted July 31, 2018 Share Posted July 31, 2018 (edited) 19 minutes ago, gravelld said: Reccos for a "better grade of felt"? https://www.diy.com/departments/roof-pro-black-super-shed-felt-l-10m-w-1000mm/1932699_BQ.prd https://www.wickes.co.uk/Iko-Black-Ultra-Durable-Super-Shed-Felt-8-x-1m/p/117668 https://www.travisperkins.co.uk/Iko-Trade-Top-Sheet-Green-1-x-10m/p/652113 Edited July 31, 2018 by Ian 1 Link to comment Share on other sites More sharing options...
gravelld Posted July 31, 2018 Author Share Posted July 31, 2018 Thanks everyone, shall look into the corrugated option too. Link to comment Share on other sites More sharing options...
Onoff Posted July 31, 2018 Share Posted July 31, 2018 I used the corrugated bitumen sheets from Wickes years ago and they were utter crap. Never, ever again. BiL used them on his woodwork shop too, same result. Not much of a slope tbh on either roof. They just sunk between the roof beams leaving like soggy washing up bowl sized depressions that then split. Can't remember the centres on my roof but I put extra angle irons in to have the distance the sheets were spanning. Think it ended up 18" maybe 2'. I always wondered if a ply deck first would have helped. Link to comment Share on other sites More sharing options...
joe90 Posted July 31, 2018 Share Posted July 31, 2018 42 minutes ago, Onoff said: . I always wondered if a ply deck first would have helped. As per my comment above, yes sagging can occur, it did not happen on a barn roof I did years ago but it was 45’ pitch, yes if flat fully supported would be good. If it’s a shed roof the timber will exist ?. Link to comment Share on other sites More sharing options...
Cpd Posted July 31, 2018 Share Posted July 31, 2018 Yes used it on 45 degree pitched roof fully supported by sarking boards. Link to comment Share on other sites More sharing options...
MAB Posted August 1, 2018 Share Posted August 1, 2018 The 15 Year Shed felt works well for me.......the standard felt which comes with most sheds tears easily and only lasts around 5 years. Link to comment Share on other sites More sharing options...
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