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Mitre joint gaps spread open on decking project

Posted: Wed Jun 10, 2020 12:55 am
by Chrisryzen
Hi there, we’ve just installed new decking and oiled it. But for some reason the inside of the mitred joints have spread open. About 2-3mm gap tapered to nothing. Would I be able to use wood filler in the gap then oil it again. Or would it look obvious that there was a gap there. Many thanks