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Chipboard, or OSB? The former at 18mm is usually only rated up to 450mm centres?
Edit: actually some T&G chipboards do go up to 600mm centres, seems to depend on the manufacturer.
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I'd be looking at costing 18mm osb at 600 Vs p5 boards at 450.
Taking up the 'loftboards' that previous owner had laid in lounge was a pig.
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counter-batten
Is this so you can fill the depth of the joists and then have a gap above? Which means you can vary the spacing.
Or just batten on top of the existing joists (not 'counter')
JonoMarshall
Kurai
hoefla
@hvsds
After getting quotes of around a grand to add a ladder and board 10sqm of the loft, I’m going to take the plunge and DIY it.
Plan is to counter-batten the current joists to give enough room for the insulation - but was wondering, for 18mm t+g chipboard, are 600mm centres fine for the battens they’ll sit on? Or is 400mm preferable?