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15-Gauge Nail Strength/Weight-Bearing Potential?

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26K views 9 replies 7 participants last post by  shawnmasterson  
#1 · (Edited by Moderator)
I am wondering what the rough strength of a 15-gauge finishing nail is? How much weight can it bear? I am fixing one of our kitchen cabinets that has come apart. I am trying to make it stronger, and have added an additional crossmember on the back of the cabinet that will also act as a frech cleat. The MDF back pieces are 1/2"-thick, so I milled a piece of pine to 1/2"-thick as well and ripped it in half for the cleat and mating piece.

I'd like to drive a few 15-gauge finishing nails into the sides of the cabinet at the very back to refasten everything together. I am just wondering if the 15-gauge nails are going to be strong enough to accomplish this task? This cabinet is fairly large and typically holds about 40-pounds of items in it I'm guessing, plus the weight of the cabinet itself.

I thought about using screws (SPAX type), but I'm not sure that's going to be any better, especially going into something that's 1/2"-thick. I'd pre-drill those holes for the screws if I go that route.

What's the best option here? The nails and screws wouldn't really be visible because this cabinet is in a recess above the refrigerator, so the sides aren't really visible.

Thanks in advance for any information here. I just want to do it right the first time because this cabinet is not the easiest thing to take down and put back up since it's in a tight spot above the refrigerator.
 
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#3 · (Edited by Moderator)
Thanks Loren, that's why I thought about using these essentially to hold the cabinet together, plus a bit of load bearing. I'm not worried about them coming out I was going to likely use either the 1-1/2" or the 1-3/4" length.

These nails are going to be hold the cabinet together. I'm going to use some large screws to secure the french cleat into the studs of the wall, then use some large screws to secure the cabinet up against the wall, and into the studs as well through the top and bottom MDF cross pieces.

I'd rather go overboard on strength/weight capacities than cut it close.
 
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#5 ·
Yes, I guess I forgot to mention that I was also going to glue this all together. The problem with the cleat in the middle is that it'll only be glued to the thin back, so that's why I wanted to make sure that attaching it through the rear sides would be enough.
 
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#6 ·
Can you scab on a nailer on the inside of the cabinet in the back and have it attached to the cross piece. That would give some extra "meat" to nail into. Also, if you use some Liquid Nails construction adhesive, it should work great and provide extra strength for your joints.
 
#8 ·
You will be, if I interpret your plan correctly, driving nails through the sides and into the new 1/2" thick cross member.
- 1/2" is a fairly thin target for a nail.
- you will be driving into end grain which has very poor holding ability, plus it may blow out if you are not perfectly centered.

A stronger joint would be to add a nailer, as suggested above by MT_Stringer. And it would be even stronger if you use screws instead of nails. (does that make it a screwer instead of a nailer?)

Alternately, could you make the cross piece 3/4" thick and use Kreg pocket screws to attach to the sides from the inside?
 
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