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Housing - Renovation: Fixings into EWI post-installation

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91 to 102 of 102

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    • CommentAuthorringi
    • CommentTimeMar 26th 2016
     
    Party paint keep the UV light out, so the wood cells don't break down as much. So making it harder for the organisms to get started.
    • CommentAuthorbogal2
    • CommentTimeApr 18th 2016
     
    I'm still trying to work out how to attach the 2nd hand mahogany conservatory to the 200mm eps Ewi on the side of our house. Any ideas?
    •  
      CommentAuthorfostertom
    • CommentTimeApr 18th 2016
     
    Does it have to 'attach', if stably free standing?
    •  
      CommentAuthordjh
    • CommentTimeApr 19th 2016
     
    Posted By: fostertomDoes it have to 'attach', if stably free standing?

    Well it needs to be stable enough that it can be weather-sealed to the house without the sealing coming apart.
  5.  
    Why not just screw through the conservatory frame, through the EWI into the brick/block of the house
    •  
      CommentAuthorfostertom
    • CommentTimeApr 19th 2016
     
    But not tightened to apply any compression, hence no frictional locating. Entirely long long screws acting in cantilever - how fat would they have to be, to not bend, and if they don't bend, will they dislocate the brick they're fixed into?
    •  
      CommentAuthordjh
    • CommentTimeApr 19th 2016
     
    Posted By: fostertomBut not tightened to apply any compression, hence no frictional locating. Entirely long long screws acting in cantilever

    Two screws at angles create a triangle that provides location without bending forces.
    •  
      CommentAuthorfostertom
    • CommentTimeApr 19th 2016
     
    Don't think so, in absence of friction, even if the angle is extremely flat i.e. more than 90o between the axes of the 2 screws
    • CommentAuthorEd Davies
    • CommentTimeApr 19th 2016 edited
     
    Seems to me that Tom's right: the triangle would get rid of the cantilever bending problem but wouldn't help with stopping the screws moving if they're not tightened up.

    You can get fixings which have a screw thread on the pointy end then a machine thread you can run a nut down for the other half. That'd allow a nut to be run up against the conservatory frame preventing turning or movement of the fixing while not putting compression on the EWI. Whether you can get them long enough for this application is another question of course. Ideally you'd want an unthreaded shank for the part through the EWI.
    • CommentAuthorEd Davies
    • CommentTimeApr 20th 2016 edited
     
    Here's the sort of fastener I had in mind. This was in my junk box - came off a bit of furniture I discarded when I left my Wycombe house I think. Have seen similar larger ones holding the dome on on a small astronomical observatory but not long enough to go through 200 mm EWI.

    The nut's completely separate - I just put it on for illustration.

    What are they called?
      dsc01784-small.jpg
    • CommentAuthorGotanewlife
    • CommentTimeApr 20th 2016 edited
     
    These are used primarily for fixing pipes, small domestic water and gas ones and large drain pipes too. Always have an appropriately sized pipe fitting on the end! ie always bought as a set IME.

    On second thoughts I think I have bought Fischer ones separately.

    An example:

    http://www.ebay.co.uk/itm/Boiler-Vertical-Flue-Pipe-Support-Brackets-clips-split-ring-Voids-100mm-BZP-/281076920510
    • CommentAuthorEd Davies
    • CommentTimeApr 21st 2016
     
    By the way, the way you drive these is to put two nuts on clamped up against each other. If they're good quality nuts the faces should line up so you can get a socket over the pair but if not you can use an ordinary flat spanner to turn the back one for which ever direction you're going. Obvious once you've seen it but a bit of a puzzle if you're unfamiliar.

    I was puzzled until shown the trick by an aircraft engineer but felt a bit better about it later when the fairly practical person I was part dismantling the observatory with didn't work it out for themselves, either. Works well when using threaded rod as a bolt, as well. E.g, https://edavies.me.uk/2016/04/1f/dsc01724-small.jpg

91 to 102 of 102

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