DIYbanter - View Single Post - Shelf pins for bookcase with long span/heavy load

blueman

writes:
On Mon, 11 Sep 2006 03:39:16 GMT, blueman wrote:
- Would adding a third parallel column of pins on each side support
*materially* improve the strength?
The 3rd row should be in the back centre. They stay out of the way
and are good looking with the sleeves.

I guess, if possible, I would prefer to avoid a back column of holes
since it will be visible (even though pretty perhaps with the
sleeves). The holes on the sides will be less visible due to a
combination of the angle and the fact that the face frame will overlap
the sides by about 1/2" or so.

I'm thinking that I will build without a middle back column of pins
and only add later if sag seems to be a developing problem.