Sat, 30 May 2026 23:19:09 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206799#Comment_206799 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206799#Comment_206799 Sat, 09 Aug 2014 10:46:09 +0100 Triassic https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206801#Comment_206801 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206801#Comment_206801 Sat, 09 Aug 2014 11:01:31 +0100 owlman https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206803#Comment_206803 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206803#Comment_206803 Sat, 09 Aug 2014 11:19:21 +0100 Chris P Bacon
Have you considered to make the roof mono-pitch so that you can maximize the area available for your solar panels?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206805#Comment_206805 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206805#Comment_206805 Sat, 09 Aug 2014 11:29:42 +0100 tony
I would hail with 30mm alloy clouts straight into the osb, no need for membrane. is this a temporary shed?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206807#Comment_206807 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206807#Comment_206807 Sat, 09 Aug 2014 14:08:30 +0100 Gotanewlife Posted By: tonyis this a temporary shed? No such thing! A bit of membrane will help protect the OSB a lot ie 80/20 rule but battoning is the 100% way forward - or cover with burned on bitumen - cheaper, quicker and more effective if you wouldn't be putting battons on, also if extended beyond OSB will drip well if no gutter, which is a bit more difficult with slates.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206811#Comment_206811 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206811#Comment_206811 Sat, 09 Aug 2014 18:59:17 +0100 Triassic ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206815#Comment_206815 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206815#Comment_206815 Sat, 09 Aug 2014 20:34:54 +0100 Ed Davies Posted By: Chris P BaconThat's the normal roof construction here, also in Scotland I think, although normally using a tongue and groove sarking board rather than OSB.Pretty sure sarking board isn't usually T&G in Scotland.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206816#Comment_206816 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206816#Comment_206816 Sat, 09 Aug 2014 20:47:44 +0100 Chris P Bacon https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206819#Comment_206819 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206819#Comment_206819 Sat, 09 Aug 2014 21:28:06 +0100 Ed Davies
Triassic, worth considering use of individual boards - I kicked up a fuss about the cost vs OSB for mine until a local builder told me that, yes, OSB used to be cheaper but now OSB is probably more expensive. Also boards are a lot more labour intensive but easier to deal with if you're working on your own.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206826#Comment_206826 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12418&Focus=206826#Comment_206826 Sun, 10 Aug 2014 07:56:28 +0100 Chris P Bacon Posted By: Ed DaviesBut is T&G guaranteed to vapour open enough to be helpful? That's the main point of using narrow boards in the first place, isn't it?A quick search suggests that when used with a modern breathable membrane it is diffusion open.

Traditionally it would have been used with a bitumen underlay and some fairly common roofing materials here such as mineral felt or standing seam metal roofing are installed directly without battens.

I know that my roof is extremely well ventilated with a air passage under the sarking formed with battens and hardboard foamed at the edges to prevent wind wash. There are vents at the eaves and at the ridge there are vents through the sarking.

I never thought about it. I assumed that the boards are narrow due to the poor quality sapwood that it is made from.

I also assumed that it is t&g to give the roof more strength for the snow loads but I never checked so may be completely wrong.]]>