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Expansion gaps for plywood

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Barney78

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I am replacing the floorbaords in my bathroom with 18mm plywood to give a nice level surface to tile on.

My Question is: Do I need to leave expansion gaps between the boards and if so how much?
 
Barney78 said:
Do I need to leave expansion gaps between the boards and if so how much?
Click to expand...
No need, but I would go one better by adding a noggins for the joint of the plywood if not on centre of joists.
 

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