Green Building Forum - External fittings on EWI Thu, 28 May 2026 22:20:41 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205711#Comment_205711 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205711#Comment_205711 Fri, 18 Jul 2014 10:08:29 +0100 Shevek
Even better, what if we backed that plastic with 300 kPa EPS? Something like the attached sketch.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205714#Comment_205714 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205714#Comment_205714 Fri, 18 Jul 2014 10:18:28 +0100 fostertom
Certainly the strength of the squirty foam bond between EPS block edges, or (with non expanding foam or polyurethane bubble glue) between board and EPS (the EPS breaks before the glue) has suggested this fixings method. Why wd you need to switch to 300kPa behind it?]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205715#Comment_205715 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205715#Comment_205715 Fri, 18 Jul 2014 10:41:05 +0100 Shevek Posted By: fostertomWhy wd you need to switch to 300kPa behind it?
To help avoid the plate trying to compress the wall insulation at the bottom edge as it tries to turn off the wall from the downward pressure. (and we're going to have a lot leftover)


Any ideas of what product to use for the board? Need to think of something I can go pick up from a shop/merchant today.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205720#Comment_205720 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205720#Comment_205720 Fri, 18 Jul 2014 12:48:25 +0100 fostertom External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205721#Comment_205721 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205721#Comment_205721 Fri, 18 Jul 2014 13:38:15 +0100 Shevek Posted By: fostertomPolythene kitchen cutting board? Ours are 10mm thk.
Genius.

You don't think worry about the 300 kPa?

I guess the larger surface area we use for the board the better. 150 mm square for downpipe, garden taps and lights, then maybe a full small/medium kitchen board both top and bottom for fixing a gas meter.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205723#Comment_205723 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205723#Comment_205723 Fri, 18 Jul 2014 14:28:40 +0100 fostertom External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205728#Comment_205728 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205728#Comment_205728 Fri, 18 Jul 2014 15:04:22 +0100 Shevek External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205747#Comment_205747 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205747#Comment_205747 Fri, 18 Jul 2014 20:57:31 +0100 Shevek External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205750#Comment_205750 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205750#Comment_205750 Fri, 18 Jul 2014 22:04:56 +0100 Nick Parsons External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205756#Comment_205756 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205756#Comment_205756 Fri, 18 Jul 2014 23:26:57 +0100 Shevek http://www.wickes.co.uk/Wickes-PVCu-Soffit-Reveal-Liner-Board-175x2500mm/p/162626]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205759#Comment_205759 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205759#Comment_205759 Fri, 18 Jul 2014 23:52:40 +0100 fostertom External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205762#Comment_205762 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205762#Comment_205762 Sat, 19 Jul 2014 08:02:35 +0100 Nick Parsons
I think I would use a big lump of timber for partial depth, and mesh and render, and hope it didn't crack.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205770#Comment_205770 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205770#Comment_205770 Sat, 19 Jul 2014 10:29:31 +0100 fostertom
Yes Nick I was fascinated by ways to use those plastic components - 27yrs ago was it? - if I knew then what I know now!]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205772#Comment_205772 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205772#Comment_205772 Sat, 19 Jul 2014 10:42:07 +0100 Nick Parsons External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205792#Comment_205792 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205792#Comment_205792 Sat, 19 Jul 2014 20:10:43 +0100 djh Posted By: ShevekOkay, so what about some form of plastic board instead of ply?

Even better, what if we backed that plastic with 300 kPa EPS?
I think I'd trust the EPS300 by itself. Maybe use a spiral anchor or dig a hole and fill it with an epoxy+filler mix.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205794#Comment_205794 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205794#Comment_205794 Sat, 19 Jul 2014 23:36:26 +0100 fostertom
If it gives confidence, maybe the way is to drill say a 40mm hole into the EPS70, where fixings are needed, glue in a plug of EPS300 and put a spiral anchor into that.

Special tool, anyone? a long tubular hole saw (or hot-edge element) could both cut the hole and make the plug.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205818#Comment_205818 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205818#Comment_205818 Sun, 20 Jul 2014 17:46:28 +0100 skyewright Posted By: fostertomSpecial tool, anyone? a long tubular hole saw (or hot-edge element) could both cut the hole and make the plug.
I've not tried the idea in this circumstance, but would a piece of plastic pipe pushed & rotated into the EPS be "hole saw" enough in itself?

I used that sort of approach using a piece of 100mm pipe as a "cookie cutter" of sorts when I wanted some 100mm circles cutting out of a sheet of 50mm EPS,]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205831#Comment_205831 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205831#Comment_205831 Sun, 20 Jul 2014 22:48:23 +0100 Shevek
Tom, yes, 300 kPA is considerably denser. If I push my thumb into as hard as I can it only makes as indentation of about 2 mm.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205832#Comment_205832 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205832#Comment_205832 Sun, 20 Jul 2014 23:46:51 +0100 Saint Posted By: ShevekNo mucking about, we just stuck a full panel of 300 kPa EPS in.


I'd be interested to see the data sheet for 300kPa EPS?]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205833#Comment_205833 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205833#Comment_205833 Mon, 21 Jul 2014 00:06:43 +0100 Shevek External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205848#Comment_205848 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205848#Comment_205848 Mon, 21 Jul 2014 11:23:26 +0100 willie.macleod
http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=10977

I have a selection of plastic "holesaws" for different pipes going through ICF. They work fine.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205878#Comment_205878 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205878#Comment_205878 Mon, 21 Jul 2014 20:23:37 +0100 djh Posted By: SaintI'd be interested to see the data sheet for 300kPa EPS?
I've attached the data sheet for my foundations.

Posted By: ShevekHmm, had a look back through my paperwork and I think it might be 250 kPa rather than 300.

As I understand it, EP300 is very rare in England and EPS250 is more common. I got mine from Eire.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205882#Comment_205882 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205882#Comment_205882 Mon, 21 Jul 2014 21:57:29 +0100 willie.macleod External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205897#Comment_205897 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205897#Comment_205897 Tue, 22 Jul 2014 10:10:50 +0100 fostertom External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205904#Comment_205904 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205904#Comment_205904 Tue, 22 Jul 2014 11:36:52 +0100 Shevek External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205939#Comment_205939 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205939#Comment_205939 Tue, 22 Jul 2014 20:04:45 +0100 djh Posted By: ShevekWhat do the wood fibre EWI people do? Same problem?
Dunno, but I suppose the obvious thing to put in a woodfibre-covered wall to provide a strong area would be a bit of wood!

In boatbuilding, if there's a soft core (balsa or plastic) it's normal to make a bigger hole and fill it with some resin+filler to distribute the load and make a strong point. For really strong point the whole core is taken out and solid GRP (or CRP) is used.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205948#Comment_205948 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205948#Comment_205948 Tue, 22 Jul 2014 21:49:37 +0100 Nick Parsons External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205966#Comment_205966 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205966#Comment_205966 Wed, 23 Jul 2014 09:36:29 +0100 willie.macleod Posted By: fostertomXPS doesn't 'breathe' like EPS so is not favourite.

XPS does "breathe" though, it is not like you are putting a sheet of steel in! Higher density EPS by its nature gets less vapour permeable the more beads you expand into the block.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205969#Comment_205969 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205969#Comment_205969 Wed, 23 Jul 2014 12:14:42 +0100 fostertom
Annoyingly (because I dislike foamed insulations), polyurethane foam is also not too resistant, at 115-1000 (but that could mean foamed in situ, not boards - and NB foil faced boards are def something else), but AFAIK all the other foams are too resistant.]]> External fittings on EWI https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205970#Comment_205970 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8514&Focus=205970#Comment_205970 Wed, 23 Jul 2014 12:45:02 +0100 Shevek
Edit: For spirals I found these (I notice they do Soudafoam B3 for £2.90/can too):
http://www.amaroc.co.uk/products/insulation-spiral-anchor]]>