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insulating a conservatory roof with expanding foam?

Discussion in 'Roofing and Guttering' started by GregIY, 7 Sep 2011.

  1. GregIY

    GregIY

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    I was wondering if anyone had tried using expanding foam in the cavity gap on a pollycarbonate conservatory roof? would only need to do the lower cavity.

    May need to pick a specific foam to use, it may not look too pretty - but i've got blinds to cover this up, may loose a lot of light possibly but a small price to pay for good insulation?

    Can anyone think why this wouldn't work or anyone have a spare bit of polycarbonate roof they can do a test on? it would be great to see pictures. I'm thinking you could make some small regular holes on the under surface and then use an expanding foam to fill the cavity?
     
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  3. Blagard

    Blagard

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    If you really must stick something in, then you would be better trying Vermiculite Granules or maybe Polystyrene Beads. Ideally poured in from the top. If you don't like it you can get them out again. Expanding foam is a one way ticket to e messy end.
     
  4. joe-90

    joe-90

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    Better off insulating properly and plasterboarding over it.
     
  5. noseall

    noseall

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    Are you anticipating the foam travelling any distance down the sheet?

    Because it won't. It is likely to clog up and start backing out rather quickly.
     
  6. Mw Roofline

    Mw Roofline

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    Youll get the stuff everywhere and it won't go down the flutes properly even if you use an applicator gun. Plus when it gets hot in the summer and cold in the winter it will all turn to powder.

    Sorry but i'd stick to the day job :D
     
  7. ^woody^

    ^woody^

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    [​IMG]
     
  8. tilly10

    tilly10

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    I'm going to buy polystyrene sheets... As thick as i can get, maybe 2 inch,glue them in place and cover with blinds
     
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  10. OwainDIYer

    OwainDIYer

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    If you permanently obscure the translucent roof then you lose the Building Regs exemption for a conservatory and have to comply with Building Regs for a building.

    as well as making it look like a complete pig's ear of a job.
     
  11. Mw Roofline

    Mw Roofline

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    Yeah it will look really great :rolleyes:
     
  12. freddiemercurystwin

    freddiemercurystwin

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    Err, not quite that simple anymore

    http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADL1B_2010.pdf

    If the conservatory complies with 3.15 (and 3.16) it will be exempt from the regs no matter how much or little of its roof or walls are glazed. Building such a conservatory is not notifiable.

    If it does not comply with 3.15 it must comply with 4.8, there is no limit on how much or little of its roof or walls are glazed. Whilst it must comply with the regulations stipulated within 4.8 building such a conservatory is not notifiable.

    If it does not comply with the above it is not exempt from Building Regulations Approval and to become a lawful development Building Regulations Approval from the LA or an Approved Inspector is required.

    Full thread here http://www.diynot.com/forums/viewtopic.php?t=278544&start=0
     
  13. Mw Roofline

    Mw Roofline

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  14. tilly10

    tilly10

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    Well it's done now, and looks good. From upstairs windows all we see is white, the sheets are a tight fit so no glue was needed. from inside I see my fitted blinds. ;)
     
  15. TRUSTME

    TRUSTME

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    CONSERVATORYS: SPRAYED ON ROOFING FOAM?

    I think your idea of sprayed roofing foam would work providing you can trowel it smooth and lay it 13 mm thick [1/2 inch] underneath the conservatory roof panels.

    Some of the foam roof jobs I've seen appeared to be insulated with cinder-toffee. Years ago a Council asked us would we be interested in a trial roof-cleaning of 10+ roofs. and to remove the foam from them, we tried doing one as a trial job and packed it in after an hour. We were trying to chip it off with wood chisels and knives. Afterwards the Council Officer admitted they'd tried removing it themselves and like us had also packed it in - so had decided to find a firm to remove it for them. In the end they covered it with Sisalkraft building paper stapled to the under-tile roof joists. Be warned houses insulated with foam in the roof are almost un-sellable because most Building Society Surveyors will not pass it or approve it. They ask for it to be removed.
     
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