I have a single storey extension to which I am adding a second storey.
To place the joists for the new first floor, I have to remove a few tiles along the ridge of the current roof which means removing rows of some tiles either side of the ridge.
I need to temporarily protect (over the summer) the existing extension from water getting in through the untiled area when it rains.
I thought of covering the new joists with some sheets of 8x4 chipboard ( which I can get at about £4.00 a sheet as they are seconds - used but in perfect condition , just dirty) and then waterproofing them.
My question is, what material can I apply to stop the chipboard to waterproof it - preferably sprayable, but brushable would do - so it would last during the summer.
(The other benefit of paneling out the joists would be the availability of a 'temporary working area' at first floor level).
Anyone got any suggestions?
To place the joists for the new first floor, I have to remove a few tiles along the ridge of the current roof which means removing rows of some tiles either side of the ridge.
I need to temporarily protect (over the summer) the existing extension from water getting in through the untiled area when it rains.
I thought of covering the new joists with some sheets of 8x4 chipboard ( which I can get at about £4.00 a sheet as they are seconds - used but in perfect condition , just dirty) and then waterproofing them.
My question is, what material can I apply to stop the chipboard to waterproof it - preferably sprayable, but brushable would do - so it would last during the summer.
(The other benefit of paneling out the joists would be the availability of a 'temporary working area' at first floor level).
Anyone got any suggestions?