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Housing - Renovation: Insulation clip

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1 to 27 of 27

  1.  
    • CommentAuthornikhoward
    • CommentTimeOct 4th 2012
     
    Hi, has anyone used these as an alternative to battens?

    http://www.toolstation.com/shop/Construction+Materials/Insulation/Celotex+Plastic+Rafter+Clip/d210/sd2738/p44294

    I need to maintain a 50mm breathing gap above the celotex between rafters and the original bituminous felt.
    • CommentAuthordjh
    • CommentTimeOct 4th 2012
     
    Sorry to be dumb, but how do you use them?
  3.  
    djh, Think you push the clip into the side of insulation board at specified centers and drop or push insulation between rafters, joists, framing and then put a fixing through the tab into the aforementioned structure to secure. Just made all that up so don't quote me on that.
  4.  
    Sorry to be dumb, but how do you use them?


    It wasn't at all clear to me either, but I think Cav8.. is right. Is there a risk of an air gap the thickness of the clip?
    • CommentAuthorEd Davies
    • CommentTimeOct 4th 2012
     
    Datasheet available from here if you want to sign up for it (I don't particularly):

    http://www.celotex.co.uk/Products/Celotex-Products/Accessories
    • CommentAuthorjamesingram
    • CommentTimeOct 4th 2012 edited
     
    A few well placed nails will give you your 50mm airgap stoppers ,
    Cutting the PUR slightly smaller , wedging with thin offcuts and foaming in, is my preferred method
  7.  
    Ed, For some reason was able to access an accessories page which described a Celotex saw suitable for boards up to 200mm thickness, which may be of interest.
    • CommentAuthorEd Davies
    • CommentTimeOct 4th 2012
     
    Yes, rubbish page design on their part. "Download accessories datasheet" link at top left tells you about the saw. "See the downloads for accessories" link at bottom left pops up a few more choices.
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012
     
    Posted By: djhSorry to be dumb, but how do you use them?


    not at all dumb Jeremy (I, before have preceded comments on here with the same) but pretty much as Cav8andrew said
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012
     
    Posted By: Nick ParsonsSorry to be dumb, but how do you use them?


    It wasn't at all clear to me either, but I think Cav8.. is right. Is there a risk of an air gap the thickness of the clip?


    I wondered that but was thinking foaming in the gap?
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012
     
    Posted By: Ed DaviesDatasheet available from here if you want to sign up for it (I don't particularly):

    http://www.celotex.co.uk/Products/Celotex-Products/Accessories" rel="nofollow" >http://www.celotex.co.uk/Products/Celotex-Products/Accessories


    it can be worth signing up as you can use the U value calc. which can be usefull (but they have just put an app out (iOS only I think*) that is almost identical that will do that for free with no log in.


    *so now I can annoy Android as well as Linux uses (at least there are quite a lot of those) as well!!!! See:
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012
     
    Posted By: jamesingramA few well placed nails will give you your 50mm airgap stoppers ,
    Cutting the PUR slightly smaller , wedging with thin offcuts and foaming in, is my preferred method


    does that mean you do without battens - one less thing to buy/fit?
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012
     
    Posted By: Cav8andrewEd, For some reason was able to access an accessories page which described a Celotex saw suitable for boards up to 200mm thickness, which may be of interest.


    it looks good, but Bacho do one for similar money in 20/22 (not 14) inches (why 14 - I have one, a 14 panel saw in a tool box which is useful, but a 20/22 would be better for PIR)
    • CommentAuthornikhoward
    • CommentTimeOct 5th 2012 edited
     
    Posted By: Ed DaviesYes, rubbish page design on their part. "Download accessories datasheet" link at top left tells you about the saw. "See the downloads for accessories" link at bottom left pops up a few more choices.


    agree for a big company like that their site is terrible
  15.  
    Posted By: nikhoward
    Posted By: jamesingramA few well placed nails will give you your 50mm airgap stoppers ,
    Cutting the PUR slightly smaller , wedging with thin offcuts and foaming in, is my preferred method


    does that mean you do without battens - one less thing to buy/fit?


    yes , if you were gonig to put the batton up the side of the rafter to create a stop , just use a couple of nails
    • CommentAuthoran02ew
    • CommentTimeOct 6th 2012
     
    Well done to the OP, another great discovery from the GBF. i spent most of the last 10 year converting lofts, installing cellotex between rafters became a monthly endurance i just wish i had discovered these little clips before, they could prove a faster easier and less messy way of installing a lot of insulation between the rafter, having said all that i do hope not to return to that line of work after putting a lot of effort into our new direction as a building company specializing in energy efficient building.
  17.  
    Worth noting that the majority of attic refurb jobs I have done required a 50mm air gap, with 75 rafters, so 25 Pu only between, and the rest below. I wonder if the 'first spike' on the clip is sufficiently closer to the bar to fit firmly into 25 thick Pu, or not.
    • CommentAuthorjamesingram
    • CommentTimeOct 7th 2012 edited
     
    an03ew , are you trying to be funny:bigsmile:
  19.  
    Nick, I wonder if they would be a little unstable with 25mm boards, if used as per the manufactures spec., friction fit with no fixings, but would probably be OK if you were then to drive a fixing through the tab into the front face of the frame.
    • CommentAuthoran02ew
    • CommentTimeOct 7th 2012
     
    Posted By: Nick Parsonsso 25 Pu only between, and the rest below


    In that situation i used to add a 50x50 fixed to the underside of the rafter to thicken up the rafter then back to 75pu between and the dreaded multifoil under.



    Posted By: jamesingraman03ew , are you trying to be funny


    Which part? I’m deadly serious I’m not looking forward to returning to dusty itchy loft spaces, also trying to create additional rooms above a crowded family living below, on a super tight budget, where the client slaps a bit of paint around at the end of the job just to save a few pounds.:angry: these low energy architect led extensions are far more interesting
  21.  
    james said: ''an03ew , are you trying to be funny''

    Darn it, inflation gets everywhere!
  22.  
    Argh! just the 2 of him then .
    Funny , as in these are a great invention ? , when a couple of nails and a wedge would do fine:smile:
    • CommentAuthornikhoward
    • CommentTimeNov 20th 2012
     
    Posted By: jamesingramArgh! just the 2 of him then .
    Funny , as in these are a great invention ? , when a couple of nails and a wedge would do finehttp:///newforum/extensions/Vanillacons/smilies/standard/smile.gif" alt=":smile:" title=":smile:" >


    Nails and wedge may be fine, but these are much quicker!
    • CommentAuthornikhoward
    • CommentTimeNov 20th 2012
     
    Posted By: jamesingramArgh! just the 2 of him then .
    Funny , as in these are a great invention ? , when a couple of nails and a wedge would do finehttp:///newforum/extensions/Vanillacons/smilies/standard/smile.gif" alt=":smile:" title=":smile:" >


    And I have broke about 3 by hitting them
    • CommentAuthornikhoward
    • CommentTimeNov 20th 2012
     
    I can confirm that these are working very well (esp. when you run out at 4pm, you order from Toolstation and have new ones at 12 next day). They are not that expensive (cheaper than tiling batten (£0.30/m?) would cost as an alternative), very quick and easy to use.

    Also discovered that when a piece of PIR has a bit too much friction so is stiff that, instead of a hammer and block of wood to persuade use a lead dresser - I had one to hand as the day before was using of lead window trays and was still upstairs. Works a treat!!

    Would use again.
    • CommentAuthornikhoward
    • CommentTimeNov 20th 2012
     
    Posted By: Cav8andrewNick, I wonder if they would be a little unstable with 25mm boards, if used as per the manufactures spec., friction fit with no fixings, but would probably be OK if you were then to drive a fixing through the tab into the front face of the frame.


    I am using 50mm sheets along 4x2 rafters (for 50mm air gap), so they work for this, as they would for thicker PIR and thicker rafters. 25mm prob is a bit thin, as are 75mm rafters in a loft conversion mind.
  27.  
    Just to clarify, the 'attic refurbs' I do are not conversions, but thermal upgrades of room-in-the-roof built at the same time as the (1900-ish) house, generally. 75mm rafters arguably skinny, but it's what they have got! And again to clarify, my ref to 25mm is only what I can get between the rafters. Another 100mm is hung underneath to give a 'scrape-through' U value of 0.18W/m2K

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