Plywood

Having looked for it in the past I do not believe there is any such thing readily available here in the UK.

In the Colonies it typically comes in 8' x 4' sheets and is relatively inexpensive.

Just the job for an "instant shed". It's good stuff.

Siding is (or was) used for building masses of cheap s***ty houses over there in a way it isn't over here. Now often PVC instead - lovely.

"Marine ply" made with Doug Fir - hmmm. Not going to get a Lloyds Certificate for that one.

Why not get some WBP ply (what they really mean) and run a router with a beading bit in it up it a few times?

I did think of buying some Birch Marine Ply and doing that .....

To make grooves visible would assume something like 3mm wide, using a standard 45 degree grooving router bit that would result in a groove

.... Marine Ply is expensive so would need to have a good idea of longevity before doing this. Anybody any idea ?

This link will give a list of suppliers of sheet material

It may be worth chatting to Robbins. In their catalgue they have something which may be similar (bottom right of page 1)

An alternative option would be to mill in longitudinal grooves into Marine Ply sheet to simulate t&g ..... anybody done this ? ... is this practical without compromising the waterproof properties of the sheet. It would be stained finish.

AIUI the waterproof comes from the glue/adhesive that bonds the sheets together.

Dave

I've done similar with a router, v groove bit & a straightedge, but only on smaller lengths e.g.2'. It looks pretty good as long as you keep the groove dead straight.

You will need to do a bit of sanding afterwards & depending on the ply you might reveal a different colour 'ply' at the base of the groove.

was this paint finish or stain ? ........ just wondering doing this would make board fail early .... I would in effect be creating 'end grain' with these grooves ... and water on end grain often delaminates the ply. I only need to rout wide & deep enough to crate the effect of planks .. almost just a shadow line.

Finish was oil. The application was indoor only.

I guess you could rout down to a ply parrallel to the top ply. Decent exterioe woodstain should be OK I guess.