A soft spot has developed in a 19mm t&g chipboard floor, probably because of heating pipes underneath. I've placed a 3.6mm piece of plywood I happened to have on top temporarily until I get hold of replacement t&g. It seems that nobody does 19mm anymore, I can get either 18 or 22 mm, which will obviously leave a hole or a lump. It's a small section that I need, any advice on which variant you would use?
Many thanks
Many thanks