hi,
About to install 2nd hand tassi oak 130x19mm floorboards over yellow tongue.

1. Not sure whether I can/should secret nail. Read elsewhere that 130mm MUST be top nailed. Is this the case or are there exceptions.

2. If I have to top nail, should the nails go through to the joists? 19mm floorboard and 20 mm Y/T. So the nail would have to be over 40mm.

Thanks
Greg


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