For nailing 1/2" or 5/8" plywood subfloor onto a concrete slab (on grade), what
length of concrete nails would one recommend for use with a power load nailer?
I'm thinking 1" may be a little short; maybe 1-1/4" would be right (which would
allow close to 3/4" nail into the concrete).
There won't be many upward forces on the floor so a minimum nail is best in this
Really? I got my estimate from observing the nails that were shot into the
carpet nailing strips around the edge of the room. These little strips had
nails no more than 3/4" long and were only sunk into the concrete between 3/8"
and 1/2". While this may not be strong enough to hold down plywood, I noticed
they were indeed quite solidly in the concrete and took some solid blows with a
hammer to remove them.
Becuase of this I was figuring a 1/2" penetration into the concrete was
sufficient to cause a solid grip so the extra 1/4" depth would be enough to hold
the plywood, since there's not much force being exerted on it.
Could there be something different about how these strip nails were set?
Of course, I don't know how well 1-1/4" nails would hold over time so I will
consider using longer.
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