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Green Building Bible, Fourth Edition
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Housing - Renovation: U-Values Insta-stik MP vs mechanical vs dot dab

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  1.  
    • CommentAuthorphilnixon
    • CommentTimeMar 3rd 2015
     
    Most calculators / certificates for internal insulation only offer u-value results for mechanical or dot and dab fixing methods.

    With it being PU foam base, I would assume that the Insta-Stik MP type adhesives would perform better than those 2 methods, but does any one know if it does make much difference to the overall u-values?

    Cheers,
    Phil
  2.  
    Lots of variables, thickness of adhesive used and its conductivity, also depth of any air gaps and circulation.

    Assuming a very tight fit then the foam based adhesive bound to be better - though probably not by enough to worry about
    • CommentAuthorDarylP
    • CommentTimeMar 3rd 2015
     
    as above, better, but not worth bothering about....:bigsmile:
    • CommentAuthortony
    • CommentTimeMar 3rd 2015
     
    I would worry a lot more about air infiltration, draughts, thermal bypass and wind getting in etc than the adhesive type.

    Are the sheets your only insulation?
    • CommentAuthorphilnixon
    • CommentTimeMar 3rd 2015
     
    Tony,

    Yes, the PIR/PUR sheets (topped with plaster board) will be the only insulation.

    I am refurbishing my Victorian end of terrace. It had severe damp and dry rot issues, so all plaster was stripped of the exterior wall. Hence I need to upgrade to 0.3 U-Value for building regs.

    When using the various manufacturer's online calculators, choosing dot & dab vs mechanical fixings can mean the difference between 50mm and 60mm sheets. Not much difference space-saving wise, but 50mm sheets are far more common and easier to find on special offer compared to 60mm ones, so I'd prefer to use these.

    Outside of the wall was re-pointed to help with water ingress / air tightness. The idea was to parge the inside of the wall then foam fix insulation and plasterboard. Maybe add few mechanical fixings for peace of mind.
    • CommentAuthortony
    • CommentTimeMar 3rd 2015
     
    Good idea, air tightness is far less of a problem with solid walls, hope that you were good and reprinted with lime:)

    What will you do to insulate between the ceiling and floor?
    • CommentAuthorphilnixon
    • CommentTimeMar 3rd 2015
     
    Yes, we were on our very best behaviour and used the traditional methods.

    Everything has been stripped out, so bar the sections where steelwork or wall plates have been added to the structure, I'll be able to have the insulation continuously down that wall.
    • CommentAuthortony
    • CommentTimeMar 3rd 2015
     
    Nice, and it is great to meet someone who does it right, no problems on the horizon now.

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