Thu, 27 Aug 2026 11:13:17 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264397#Comment_264397 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264397#Comment_264397 Thu, 04 Jan 2018 12:45:15 +0000 jamesingram Anyone looked into design details for roof mounted PV in the Outer Hebrides
Wind speed from national chart are >28-29m/s

Roofing in the area generally involves fully sarked rafters with OSB and all tiles nailed

I was looking into fitting a GSE inroof system ,just wonder about its suitability , I'll contact manufacturer/supplier
but was just wonder if anyone had any site experience in that area.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264400#Comment_264400 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264400#Comment_264400 Thu, 04 Jan 2018 15:41:48 +0000 SteamyTea The loads are probably less i.e. no tiles, so less weight and the wind loadings similar.

If an MCS installed system, then it needs an SE to sign if off anyway (I think).]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264405#Comment_264405 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264405#Comment_264405 Thu, 04 Jan 2018 16:49:52 +0000 jamesingram Ive spoken to supplier and theyve suggest its ok with additonal fixings]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264406#Comment_264406 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264406#Comment_264406 Thu, 04 Jan 2018 16:50:51 +0000 jamesingram https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264407#Comment_264407 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264407#Comment_264407 Thu, 04 Jan 2018 17:37:37 +0000 Nick Parsons https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264410#Comment_264410 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264410#Comment_264410 Thu, 04 Jan 2018 19:34:20 +0000 jamesingram https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264411#Comment_264411 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264411#Comment_264411 Thu, 04 Jan 2018 19:53:02 +0000 SteamyTea When I question them about fitting PV, he rather dismissed the issue away.
I think local strengthening is probably needed. There is snow load to worry about.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264419#Comment_264419 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264419#Comment_264419 Thu, 04 Jan 2018 21:16:19 +0000 TimSmall
With the GSE panels, you can use extra brackets if necessary (e.g. 3 or more per side instead of two). You may also want to go for bigger fixings than theirs (I did, although the GSE ones are probably OK, I think the UKNA for screw fixings is conservative, and GSE's are based on pull-out tests), and/or something to increase the depth which the thread is embedded in the timber.

Being a lean-to extension, the worst-case snow loadings were pretty fearsome (a snow drift against the house, a couple of metres deep), and I switched my battens for decking to support the max snow load in some places.

The other half of my panels are more conventional frame mount ones on a flat roof, and some newly (at that time - I think I purchased a copy for about £25) published research on uplift factors for framed PV modules was very useful and produced a more practical design vs. applying the bare Eurocodes.

You can get software to produce a directional site wind analysis (doing so manually is pretty tedious) based on your map location, which I'd recommend.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264423#Comment_264423 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264423#Comment_264423 Fri, 05 Jan 2018 00:24:33 +0000 Peter_in_Hungary https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264479#Comment_264479 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264479#Comment_264479 Sun, 07 Jan 2018 14:38:59 +0000 jamesingram https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264512#Comment_264512 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264512#Comment_264512 Mon, 08 Jan 2018 18:10:23 +0000 valasay I'm very nervous about the wind load since its only a few years since the wind gauge broke after recording winds in excess of 136 mph! The important thing is local knowledge because there are houses only a mile and a half away that are completely sheltered and would have no difficulty with wind loading and can grow trees and shrubs...
The option I would consider would be ground mounting but do think too about the risk of them acting like sails without the sides and back being protected in some way.
The other little thought is about maintenance. Its not always easy to get willing tradesmen to do the trickier jobs and ground mounting might make maintenance easier too.
I have no knowledge of anything practical but these are my thoughts from experience of being exposed to the wind.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264514#Comment_264514 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264514#Comment_264514 Mon, 08 Jan 2018 20:50:20 +0000 djh Posted By: valasayThe option I would consider would be ground mounting but do think too about the risk of them acting like sails without the sides and back being protected in some way.
I wonder if there's any market for moulded backs to stick on the underside of panels, giving them an aerofoil shape so they develop downwards lift instead of trying to pull away?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264530#Comment_264530 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264530#Comment_264530 Tue, 09 Jan 2018 13:37:05 +0000 SteamyTea I know who fitted them.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264559#Comment_264559 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264559#Comment_264559 Tue, 09 Jan 2018 23:15:55 +0000 TimSmall https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264702#Comment_264702 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264702#Comment_264702 Sat, 13 Jan 2018 14:49:03 +0000 jamesingram Its a new build on north west coast (SIP structure) so needs some mircogeneration as part of planning , I'm not sure but presumed planning might want it 'on/in' the house to qualify perhaps not, and additionally planning would be required for a ground mounted system as well.
the roof finish is metal sheets, which the client says is common up there so really a PV panel will have no more up lift than a large sheet , that doesnt mean both wont be rippped of when the wind gets going.
A small Wind genny would certainly be a better suited generator for the location.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264703#Comment_264703 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264703#Comment_264703 Sat, 13 Jan 2018 14:59:41 +0000 jamesingram https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264870#Comment_264870 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15482&Focus=264870#Comment_264870 Sat, 20 Jan 2018 14:34:40 +0000 Rex http://www.nulokroofing.com/uk/). They look like slate and are firmly held down on both the lower and upper edge so thee is no chance of the tile lifting.

Furthermore, if you want to replace one tile it is a very simple operation. They also supply PV tiles that fit onto the roof with the same system. All flush with no edges to allow the wind to get under.

And no , I don't work for them but have them on my roof and am a very happy bunny!

Rex]]>