woodsmith
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If you have cut out the old chipboard you don't need to leave a gap between the new and old chipboard. Where you would need to leave a gap is if the floor butts up against an outside wall, then 5-10mm is enough.
Where the old and new boards butt up you will need to add some support underneath the joint, unless it happens to correspond with an existing joist.
There are different thicknesses of chipboard flooring, make sure you get the same as you have taken up. Screw the new boards down rather than nail them, it will prevent any damage to the ceiling of the room below. The long joints along the edge of the boards do not need to be supported the short joints do. They should be over a joist, otherwise fit some support underneath. Glue the joints, it helps to stop creaking and stiffens the floor.
I think that is it. Hope it helps.
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