Wood movement question / Barrister bookcase


JohnDi

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Building the bookcase and just finished the side panels.

Even though I watched the videos numerous times, just realized Marc uses plywood for the tops because of wood movement concerns.

I don't have the ply but do have plenty of hardwood (Sapele) that I could use.

since the pieces are only about 5" wide, is it an absolute no no to use solid wood?

Would pocket screws with no glue solve the problem?

Walnut ply not in the budget at the moment☹️

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Are you referring to the tops of each section or the actual top of the whole bookcase.  The actual top was made of solid wood and attached with two row of three screws each, one row was slotted (elongated) for wood movement.

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I don't know what kind of can of worms you would be opening using the sapele in place of the ply.  Your top box has, by the plans one solid piece of ply and the other two have two 5 inch +/-  strips one in the front and one in the back and then the interlocking piece mounted to the top of the box below.  You need the interlock to be fairly snug or you boxes will slide back and forth on each other.  If you use solid wood you are going to have to allow for movement which means that part of the year your boxes will have to much room to slide and the other part of the year they will fit properly.  I don't know the situation in Philly but here I would have to leave a 1/16 inch gap in each interlock seam to allow for movement,thats an 1/8 inch total of slop.

If it were me, I think I would play it safe and just wait until I can put the money away for the ply.  Hopefully someone here can give you some ideas to use the material you have.

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14 hours ago, K Cooper said:

Chet, could he not use the Sapele for the front and back pieces and use 2 small 1x2's as the male center strips, thus less movement? And attach the 5" front and back pieces as Mike suggested? That 3/4" walnut ply IS expensive!

I would think it might.  My problem is I am too big of chicken :blink: to try something that goes against traditional wisdom structurally.  But that is just me, hopefully some one with more experience will chime in.

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