Foam/Glue Problem

[jacon12]

QUOTE: Originally posted by selector

Not to my way of thinking, Jarrell. I though you would merely want to get it back flush, surface-to-surface with the adjacent piece. If it is lifted by, say, 3/8", then you want to reduce it by that amount…only. I see no need to reef it all the way donw to the slanted butt-end of the plywood below it. In fact, the better solution, overall, might be to do as you were just saying…cut a plug, glue it to the plywood to fill the gap, and then reglue the big sheet to the plug; no need for screws. Either way, it should work. I would personally use your method. Fast, less complicated, less like modern surgery on a broken femur.

Ok, I got’cha… we were thinking the same. I just want it back flush with its counterpart and no lower. I guess I just gotta wait til the glue dries before finding out if it works. I sure hope it does but if not, I’ll try the screw method.
Jarrell

[Medina1128]

Whenever I join two adjacent sections of foam, I always stagger cut the foam, so that the top of one section overlaps the section next to it. That way, you can also glue each section to the one next to it. And it’s stronger than just trying to butt the ends against each other.

[oleirish]

Jarrell ; I have a question? When you put your bench work togethor ,how did you secure the plywood to the frame work??When I anchor the plywood to the bench work I use SHEETROCK screws,I counter sink them and then fill them in.I have never had the plywood come lose.

JIM

[selector]

Jim, his plywood is okay, except that one end has a champhered, or bevelled edge, and he unwittingly missed that when he glued. So, his foam sheet, at that edge, has lifted at one corner because it was unsecured. The plywood, itself, is firmly held to the benchwork.

[Bikerdad]

Unless this is a yard, why mess with the benchwork? Take a surform rasp to the joint and rough it up. Incorporate it into the scenery, use cuts and fills to get your track across the joint, etc.

[selector]

Good point. I guess Jarrell has to decide what he can live with. Maybe he want’s to get this put right so that it becomes part of his learning.

[jacon12]

You’re all correct. Lesson learned: never butt join the foam over the butt joint of the plywood! Never… [B)]
Crandell is right in that the foam didn’t adhere to the beveled portion of the plywood. If I had done the above, there wouldn’t be a problem. The plywood is held down by sheetrock screws that are countersunk. There’s even Liquid Nails in some places. I’ve had the 30lbs of books on it for about 24 hours now and will leave them until at least tomorrow. If that fails to hold it I’m going to put a couple or three screws/washers in it just enough to bring it down some (or to secure any further separation) and get out the rasp and maybe make a stream bed there![^]
Jarrell

[orsonroy]

Actually, a waterway or ditch isn’t the worst way to handle a badly-behaving foam joint. I’ve had to resort to that trick a couple of times…

[oleirish]

QUOTE: Originally posted by selector

Jim, his plywood is okay, except that one end has a champhered, or bevelled edge, and he unwittingly missed that when he glued. So, his foam sheet, at that edge, has lifted at one corner because it was unsecured. The plywood, itself, is firmly held to the benchwork.

Thanks I guess I looked at it wrong,sorry!!
Jim