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NHannon8;892003 wrote: Grouper, the softer wood is always the least dense and therefore the least stable material. <span style="color: Red">Not accurate</span>, <span style="color: Red">Mahogany being one of the first to come to mind Oak and Walnut are actually very porous so much so that a filler is needed for both when doing highend finishing </span>. The ability for the fastener to work is dependent on how much surface area is in contact with the fastener, whether it be a screw or nail, and the more dense the more contact.<span style="color: Red"> Spot on</span> The head of the fastener, screw or nail, will hold the less stable material more effectively than the pointed end. <span style="color: Red">Agreed that would hold true for any material</span> I have seen plywood pull off of a nail or screw that is driven the opposite way through the 2x4 in less than a week. <span style="color: Red">Incorrectly done I agree or in extreme moist or unstable conditions</span> After going back and correctly fastening it, it has gone years without moving. I know this probably doesn't explain your questions completely, but it is one of those things that is passed down from Master Carpenter to Apprentice for as long as finished carpentry has been around. I can't count the number of times my Master Carpenter drilled this into my head while I apprenticed for 5 years with him.
I haven't been privileged to apprentice with a Master carpenter as you have so I will have to go on my limited experience as wood butcher but I would bet my tool belt that the plywood is far more stable and harder than the SPF 2x4 that it is being screwed to. Unless of course it is standing in water. I did not see the need to worry about stability in this application as it should stay relatively dry. More cocerned with aesthetics than function but since the trim will cover no big deal.
To the op. For future reference look for a birch or cabinet grade plywood as the moisture content is more closely monitored during production which usually results in a flatter sheet. Always ask for domestic made plywood as well.
Edit:
JDavid;892005 wrote: Plus, it seems a hell of a lot easier to do
I'm sure it is, of course cinder blocks are as well.
