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Dadoed Shelving

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Forum topic by wookie posted 250 days ago 612 views 0 times favorited 10 replies Add to Favorites Watch
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wookie

154 posts in 1682 days


250 days ago

Topic tags/keywords: built in bookcase question joining

Hey Guys and Gals,

Need some opinions\suggestions for a built in bookcase project. i want to dado in the shelving using 3\4” plywood. My question is, the span of the shelves are 36’. There will be some weight put on these shelves, books. Will these shelves be strong considering the span? Going to rabbit in the back using either 1\4” or maybe 1/2” plywood then screwing the back into the shelves for extra strength. Think that will be enough?

Thanks,

Jack

-- Wookie=Wood Rookie


10 replies so far

View DeltaDaddy's profile

DeltaDaddy

52 posts in 252 days


#1 posted 250 days ago

that is a large span and the shelf will most definitely sag. running a dado in the back will help strengthen it. Is this going to be a frameless cab?

-- Take it apart to see how it works

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wookie

154 posts in 1682 days


#2 posted 250 days ago

It is going to be 3 separate units screwed together with a face frame.

-- Wookie=Wood Rookie

View Bogeyguy's profile

Bogeyguy

457 posts in 666 days


#3 posted 250 days ago

Just place a 1-1/2” X 3/4” solid edge on the front of the shelves for strength in the span.

-- Art, Pittsburgh.

View DeltaDaddy's profile

DeltaDaddy

52 posts in 252 days


#4 posted 250 days ago

^ what bogey guy said^ If they are adjustable shelves and if they are all fixed shelves the face frame will strengthen the shelf in the same manner

-- Take it apart to see how it works

View GOOD LUCK TO ALL's profile

GOOD LUCK TO ALL

418 posts in 326 days


#5 posted 250 days ago

I think if your screwing the back into the shelf it would be strong enough, but a trim pc on the front edge would definitely help. I would put about an 1 1/4 pc on the front.
I also try to limit the span to 32” so that I can get 3 cuts out of a sheet of material, (unless whatever your building can utilize the other pcs)

View Rick M.'s profile

Rick M.

3777 posts in 978 days


#6 posted 250 days ago

Wookie, have fun with this.

http://www.woodbin.com/calcs/sagulator.htm

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View AandCstyle's profile

AandCstyle

1249 posts in 855 days


#7 posted 249 days ago

+1 to Rick’s suggestion.

-- Art

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wookie

154 posts in 1682 days


#8 posted 248 days ago

Thanks a bunch guys. I did have fun with the sagulator! (I also have been known to watch someone paint a wall online too.) The solid piece on the fronts is the way we will probably go. Also still considering dadoing the backs too. You guys are great!

Cheers,

Jack

-- Wookie=Wood Rookie

View Tony1212's profile

Tony1212

29 posts in 333 days


#9 posted 248 days ago

If you take a look at my Kitchen Table and Built-in project, I did a very similar type of built-in. I actually built 4 cabinets, 3 side by side and one on top, and the far left cabinet is about 46 inches wide by 15 inches deep. I screwed them together with a face frame to hide the end grain of the Baltic birch plywood.

The shelves are made of 3/4” plywood with 3/4” x 1.5” hard maple fronts. The maple was was put on the ply so that the 1.5” was visible from the front – flush on top and a lip on the bottom of the shelf. I used pocket screws and glue to attach the maple to the plywood.

There is one fixed shelf in that cabinet. I only dadoed the sides then used glue and screws on the sides and back. All the other shelves are adjustable, so no other dadoes.

My wife has had a good time loading those suckers up. Maybe 50 to 60 pounds fairly evenly distributed. So far (about 4 months), no sag.

for consistency sake, I kept the look of the shelves the same for the other cabinets even though it was overkill for the 11 inch wide cabinet.

-- Tony, SW Chicago Suburbs

View wookie's profile

wookie

154 posts in 1682 days


#10 posted 247 days ago

Thanks Tony. Your project turned out great. I am also in IL, the Peoria area. Not far from Washington that was hit by the F-4 tornado.

-- Wookie=Wood Rookie

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