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Found 1 result

  1. ToughButterCup
    Our rafters are 225 mm by 47mm. The insulation specified is 200 mm of Kingspan K7 between the rafters (underlayed by 82.5 mm of K18 ) Hence the 25 mm issue. And the 82.5 mm issue I suspect. Architects are like that aren't they? I have 225mm of rafter to fill: should I leave an air gap? (I bet the answer is No) should I fill the gap : 100, 100, 25 and then underlay it all with 60 mm K18 (not 82.5 mm as above) Or do something more intelligent? Which is where you come in.
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