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Green Building Bible, Fourth Edition
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Products: How much per m2 for EWI

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    • CommentAuthorMike George
    • CommentTimeSep 9th 2014 edited
     
    James, If I'm understanding you right a sort of home maid base rail detail? But (importantly) without the thermal bridge caused by the omission of insulation below what would otherwise be a base rail

    I agree with the £100 ish /m2 for that level of detail regarding enablement and ancillary works
    • CommentAuthorMike George
    • CommentTimeSep 9th 2014 edited
     
    Tom, Where thickness affects cost is where there is insufficient eaves overhang/soffit width
    • CommentAuthorjamesingram
    • CommentTimeSep 9th 2014 edited
     
    yes , pin a plastic drip bead onto the bottom of the board and let the mesh render hold it all together.
    Probably wont pass suppliers quality assurance but then I'm very much a 'make it up as you go along' type of builder :bigsmile:
    • CommentAuthorjamesingram
    • CommentTimeSep 9th 2014 edited
     
    Posted By: Mike GeorgeTom, Where thickness affects cost is where there is insufficient eaves overhang/soffit width

    yes and soil pipe etc.
    Interesting to see on my neighbours house and others in the area (social housing done under ECO) they just stuck 2x45 deg joins and made a kick at the bottom of the soil stack which I was under the impression was a no-no
    • CommentAuthorMike George
    • CommentTimeSep 9th 2014 edited
     
    Posted By: jamesingram
    Posted By: Mike GeorgeTom, Where thickness affects cost is where there is insufficient eaves overhang/soffit width

    yes and soil pipe etc.
    Interesting to see on my neighbour house and others in the area (social housing done under ECO) they just stuck 2x45 joins and made a kick at the bottom of the soil stack which I was under the impression was a no-no

    Apparently this is acceptable as it seems to be common practice. Drainage work probably outside the scope of any system Warranty and even though contravenes building regulations it is allowed.... Or at least overlooked
    • CommentAuthorMike George
    • CommentTimeSep 9th 2014 edited
     
    Incidentally I don't think I've ever come across the breg specified slow bend in the kind of houses we are talking about (solid walls) And to introduce one can sometimes be impossible as there is simply not the room (or depth) when linking in to an existing system...
  7.  
    I see a messy problem greeting someone down the road :confused:
  8.  
    Yes in the deep brown runny stuff as it were....
  9.  
    Posted By: Mike GeorgeIncidentally I don't think I've ever come across the breg specified slow bend in the kind of houses we are talking about (solid walls) And to introduce one can sometimes be impossible as there is simply not the room when linking in to an existing system...

    as in existing installation ? most I've dug out in the past for various reasons have been clay long radius bend
  10.  
    Yes as existing - may be a geographical thing?
  11.  
    smaller poo's over your way ?? :bigsmile:
    • CommentAuthorSaint
    • CommentTimeSep 11th 2014
     
    Clippyclaus, trying to whisper you the details of the company with the EWI £20-30/m2 prices but because the posting has gone onto a next page I can't. Can anyone help?
  13.  
    Do you mean how to quote from previous page? If so just quote any post off this page; change the name of the poster to Clippyclaus and copy and substitute the comment from the previous page :)
    • CommentAuthorEd Davies
    • CommentTimeSep 12th 2014
     
    Note, it's “chippyclaus” (as in Claus the carpenter, I assume, rather than Claus the bus conductor). Maybe an “h”/“l” typo is what's causing the problem. Just copy and paste the name into “Whisper your comments to” box to post privately. If you're nervous about it, first post it as a dummy message then, when you're sure it's a proper whisper (light red background), go back and edit it to put in the confidential information.

    By the way, if you find it difficult to copy and paste the contents of a link (eg, the posters' names on this forum) then try holding the alt key down while selecting the text - it's something that's crept into browsers quite recently (last year or two) and can be very handy sometimes.
    • CommentAuthorSaint
    • CommentTimeSep 16th 2014 edited
     
    Posted By: Ed DaviesNote, it's “chippyclaus”


    Aaahah...no wonder I was struggling :confused: Thanks Ed :bigsmile: Sad to say I aalso remember when bus conductors were called Clippies
    •  
      CommentAuthorfostertom
    • CommentTimeJun 13th 2016
     
    Reviving an old one.

    What's latest on rendered EPS EWI £/m2 all-in, assuming a bungalow needing minimal scafolding, lots of space around, generous extg eave overhang, ignoring rwp etc relocation?

    While at it, split the cost into a) everything up to ready-for-basecoat, and b) the whole render finish.
  17.  
    Over here we are looking at about 6.40 pounds for materials for 100mm thick and about 8.90 pounds for 200mm. Includes glue, fixings, net, and render. Labour charges are 1 hour labour / m2 and this is typically divided in to 3 for part DIY. - 1/3 putting up EPS inc fixings, 1/3 netting and adhesive layer and 1/3 thin film render. For complete job the price includes any scaffolding needed.

    Material prices may be a bit different, but a lot is imported here so not much difference and I don't see the labour should be any different as I quote hours not price.
    •  
      CommentAuthorfostertom
    • CommentTimeJun 13th 2016 edited
     
    Thanks Peter v helpful
    Any more?
    • CommentAuthorowlman
    • CommentTimeJun 13th 2016
     
    Would there be any point/benefit in a partial EWI?
    My bungalow N wall about 17M long has few intrusions, only one window, with a generous soffit. The other three aspects are far too complex in terms of windows doors etc. to make it viable. Plus one of those three aspects is road facing, in a conservation village so brick it has to stay.
  20.  
    I will be EWI'ing a gable up to just above first floor level. I IWI'd the rest of the house for the client years ago. This remaining bit wold be the most difficult to IWI. Yes, there *will* be a benefit in (this) partial EWI.
    •  
      CommentAuthorfostertom
    • CommentTimeJun 13th 2016
     
    17m - that's long. Does that mean it's a long thin house? If so, makes it more rather than less worthwhile to do just that one wall - work out the ratios of improved:unimproved areas.
    As it's nearly windowless, all the better in terms of improvement per £ spent and decrease of £ on fuel forever more;
    however even if the latter is a good and worthwhile saving it'll still be small relative to the £ on fuel still being spent thro the other, windowed elevations.
    • CommentAuthorEd Davies
    • CommentTimeJun 13th 2016 edited
     
    Posted By: owlmanWould there be any point/benefit in a partial EWI?
    Simplistically, adding insulation to a bit of wall has as much or as little benefit in terms of energy saved whatever the level of insulation on other bits of the house.

    Reality is more complicated, of course. The insulation might allow higher indoor temperatures (likely good in themselves for comfort or health) but which would cause increased losses through the other walls but, if the heating is the same, then less loss overall. Also, the EWI'd wall would likely be warmer on the inside meaning that any condensation would likely be concentrated on the other walls which might be a problem.

    ETA: but what if it's a cavity wall? I'm thinking of thermal bypass round the corners.
    •  
      CommentAuthorfostertom
    • CommentTimeJun 13th 2016
     
    Posted By: Ed Daviescause increased losses through the other walls
    I don't think so in abs terms, unless mean internal temp is higher. But yes in the %age split of where the remaining loss goes out.
    Gd points about condensation and bypass via cavity walls.
    • CommentAuthorEd Davies
    • CommentTimeJun 13th 2016 edited
     
    Posted By: fostertomI don't think so in abs terms, unless mean internal temp is higher.
    Yes, that's what I meant. I've edited the post to make it a bit clearer.
    • CommentAuthorgravelld
    • CommentTimeJun 14th 2016
     
    I was wondering whether to post this in its own thread but it's on topic here so...

    Is there a resource for building details for incremental improvements in the fabric? It would cover both making the best of the improvement, plus also how to cater and allow for future upgrades.

    An example may be only insulating a subset of the CWs like here. Or maybe how to EWI but not replace joinery and how to both maximise performance and make it easier to replace joinery later. Or how to treat eaves, with a view to insulating the roof later, but also make the most of the insulation reducing bridging e.g. joining to cavity and or existing loft floor insulation
  26.  
    Up to date prices please? I have approximately 100m2 tops

    Looks like I'll just IWI but would be handy to know comparison costs....
  27.  
    A couple of months ago I was quoted around £40/m2 for all materials, trims etc, for an average of 175mm Platinum EPS.

    That does not seem to compare too well with Peter-in-Hungary's £8.90/m2!!!!
    •  
      CommentAuthorfostertom
    • CommentTimeJun 19th 2016 edited
     
    I just totted up materials incl trims, foam, mastic etc for 200mm Plat, rendered, to £33/m2, based on 2.5yr old quotes, £40/m2 for 300mm

    Labour I thought £15/m2 to fix, £30/m2 to render, assuming 4x higher hrs/m2 than Peter_in_Hungary above!
    That's 1.5hrs/m2 @£10 to fix (incl foaming all joints) and 2.5hrs/m2 @£12 to render (incl scrupulous bead fixing/mastic around windows).
    What I've seen of everyday EWI in e.g rural Estonia is incredibly rough and ready!

    VAT extra to all the above.
  29.  
    Peter suggests 1hr labour 'all in' per m2

    That sounds more realistic... If a house is say 80m2 that's two men for a 40hr full week. I think mine was done in about that time scale.

    So say £12 per m2 labour
    £40 per m2 materials

    So circa £50 per m2 more realistic?
    •  
      CommentAuthorfostertom
    • CommentTimeJun 19th 2016
     
    I'd say not long enough.

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