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Old 12-27-2017, 12:58 AM   #4
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 20,753
Yes, it matters. And if you’ve got tongue & grove planks, it’s an older home. And older homes were built with everything from under-built to over-built. It pays to know what you’re starting with so you can build appropriately.

If you can't directly see the joists, making an access hole from the top in an area that won’t be compromised by doing so is a good idea. A 3” holesaw can make quick work of it.

And like Kevin asked: Are the planks perpendicular or diagonal to the joists?

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