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cavity closer recommendations

  • 26-05-2010 5:53pm
    #1
    stylers
    Registered Users, Registered Users 2 Posts: 188 ✭✭


    Hi All,

    starting blocks shortly on my build and was looking into the cavity closers provided by xtratherm, kingspan etc. I have a 140 mm cavity and 100mm insulation so normal cavity closer blocks will still leave a gap at the opes. I have never seen these closers used before, though I am told they are in widespread use. There seem to be two ways of doing it, with flanged fit closers or checked fit. the flanged fit type closer extends both sides of the cavity past the blocks, whereas the checked fit closer butts up against the outer blockwork (i.e the outer blockwork has to extend into the ope slightly, and the window or door is fitted from the inside). the checked fit closer has been recommended to me by suppliers. Any pro's or cons to both methods ?. Also, there are wall ties available for them which clip into a groove on the back of the closer, and extend into the blockwork at an angle. Are these optional ? (some of the literature seems to suggest it). If they are necessary, does this mean you need to build with the closer in place ?. Any advice would be great, as need to decide shortly what way to go.

    thanks in advance..


Comments

  • #2
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    Cavity closers are widely used in the UK, they have used them successfully for decades.

    Closing the cavity with a factory made Cavity Closer that will prevent fire spread, incorporates insulation and a d.p.c makes alot of sense.


  • #3
    stylers
    Registered Users, Registered Users 2 Posts: 188 ✭✭stylers


    update.. I've had a look at an example and there's nothing to lose really.. i'm assuming it won't weaken the wall around opes by not using closer blocks as there are ties on every course around the opes anyway.. also you can fit the flanged type under the sills too to lessen the thermal bridge there. I take it they would also be a help with airtightness as there's no reliance on foam to fill gaps.. i.e. they could be sealed properly. Any other opinions on them ?


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