The spacing between boards is only under certain circumstances for solid wood only which I will not explain. The expansion and contraction depends on humidity more than temps. So if you have AC for summer, it's a dehumidifier and for winter you should have a humidifier. But first of all you should have a hygrometer to see what the humidity is. You have to control the humidity also to maintain the warranty and that will minimize the expansion.napoleonbot wrote: ↑Mar 1st, 2017 9:11 amthanks for your answer
Some guy recommend 1mm per board for expansion gap, right or wrong that's a lot for a big room; if you allow 1/2" gap, then you have to believe that the outside ring of board do need to move 1/2" which is more than enough to pull nail off. right?
Is that possible to put a shim btw every board that allow them to expand and mostly settle in the middle.
Another question is, the expansion is actually due to humidity rather than temperature - well these two change together outside, but inside essentially it is humidity not temperature.
So can you timing your expansion gap, such like: if you install in winter, that you know air is dry you should leave sufficient gap, while if you do it in august without AC, you should leave very little gap, coz you know it will only contract.
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