On 4 Apr 2021 at 17:10:03 BST, "John Rumm"
wrote:

On 04/04/2021 15:57, T i m wrote:
On Sun, 4 Apr 2021 05:51:00 -0700 (PDT), "
wrote:

Would appreciate any thoughts you have on the matter

I'm not sure you will. ;-)

For the shelves, straight Contiboard for light loads or
tongue-n-groove floorboards that can be glued together for wider
shelves and with the tongues cut off the front shelf (and glued in the
rear groove IYCBA) are very very strong (no sag) and when sanded and
not painted, need little in the way of maintenance, no matter how
rough you treat them.

Also worth checking softwood window boards - readily available from most
builders merchants etc:

http://wiki.diyfaq.org.uk/index.php/...ardShelves.jpg

Having said that, for most applications I find 3/4" ply with a softwood
lipping is usually pretty good at not sagging so long as the shelf is
10" deep or so.



I've used 100x20cm timberboard in alcoves, support only at the edges, from
Wickes for bookshelves. Been up several years and no signs of sagging.


--
Cheers, Rob