will it sag

  • Advertise with us

« back to Wood & Lumber forum

Forum topic by jmp posted 02-01-2011 11:11 PM 1294 views 0 times favorited 6 replies Add to Favorites Watch
View jmp's profile


43 posts in 3298 days

02-01-2011 11:11 PM

I really like the idea of making the cherry low bookcase (Woodsmith 155) but cant source the 3/4inch cherry veneered ply anywhere in the UK. 19 mm veneered MDF is the nearest i can get. Will using MDF risk the shelves sagging though?


6 replies so far

View jmichaeldesign's profile


66 posts in 3389 days

#1 posted 02-01-2011 11:44 PM

I think you’ll be alright. Looking at a quick picture of the shelves in question it looks like the shelves are about 36” wide on bottom, but the dividers on the upper shelves will actually support them in the middle, so at 18” I think you’ll be fine.

What veneered ply can you source? Especially with a dark stain birch ply and cherry blend together easily, and if you want a lighter tone, you could just build the whole thing from birch and stain it a medium tone.

View Nomad62's profile


726 posts in 3564 days

#2 posted 02-02-2011 06:51 PM

Hard to say. Mdf has its purposes, but I wouldn’t use it for shelving. I would tend to use an alternative wood rather that mdf if the cherry is unavailable simply because shelving tends to hold stuff that will eventually warp the mdf. Just my 2 cents worth…

-- Power tools put us ahead of the monkeys

View Moron's profile


5046 posts in 4499 days

#3 posted 02-02-2011 06:55 PM

I dont know the width of the mdf, nor if its face framed or has a solid front edge (helps) but if its over 32” wide (even that, it’s “iffy”) it will sag

-- "Good artists borrow, great artists steal”…..Picasso

View RickLoDico's profile


55 posts in 3667 days

#4 posted 02-03-2011 03:00 AM

That bookcase calls for a face frame. You can double up the mdf and it will never sag.

-- He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.

View Gofor's profile


470 posts in 4393 days

#5 posted 02-03-2011 03:33 AM

If forced to go with fiber board, you would be better served with HDF (high density fiberboard) as opposed to MDF (medium density fiberboard). Engineered wood flooring may also be an option.


-- Go

View Marlow's profile


193 posts in 3277 days

#6 posted 02-03-2011 05:07 AM

You could get a rough idea of the deflection by running the sagulator for different materials:

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics