Flatten plywood board?

[Skogsbullen]

How to make a warped plywood sheet flat? I was planning to put up a thick plywood sheet (18 mm thick, about 80*150 cm) on the wall in the garage, but it turned out that the intended sheet is "banana-shaped."

I have tried placing it in the garage with support at the ends and putting weights in the middle. It temporarily bends in the opposite direction, but as soon as you remove the weights, it returns to its original shape. It has been like this for two weeks now, but the warp hasn't disappeared.

 

[Enk Projektet]

You'll probably need to try fastening it with more screws into the wall studs and see if that works...

 

[Nyfniken]

You might want to screw it onto the wall in, for example, the garage. After a couple of years, it will hopefully be completely flat. Then you can take it down and screw it up where it was intended.

/Mr. Saturday Night

 

[Skogsbullen]

You might want to mount it on the wall in the garage, for example. After a couple of years, it will hopefully be completely flat. Then you can take it down and mount it where it was intended.

/Herr Lördagkväll

A couple of years??? I want to have it on the wall within the next few weeks.

Could humid air and the right load maybe change the shape? Putting it outside under a roof with weights on?

 

[cust3000]

The previous speaker naturally means that you should screw it in where it's supposed to be...

Just put in a few extra screws, it will probably straighten itself out...

 

[prototypen]

Place it as before with heat and ventilation only on the top side, and maybe it will pull in, but it might be doubtful.

Protte

 

[Skogsbullen]

Thank you for the answers. If I don't manage to bend it correctly, I guess I'll have to try to force it into place on the wall. But it won't be easy since it is quite thick and therefore quite stiff. If it had been a 12 mm board, it would have been easier.

 

[Enk Projektet]

Thank you for the answers. If I don't manage to bend it correctly, I'll have to try forcing it into place on the wall. But it won't be easy since it's quite thick and thus really stiff. If it were a 12 mm board it would have been easier.

What are you going to use it for?

 

[pelpet]

Start by screwing it in at the top, and then screw it in while pressing it against the wall. That should straighten it out. In the worst case, the rest of the garage will become banana-shaped

 

[Nyfniken]

In the worst case, the rest of the garage will become banana-shaped

In that case, you need to buy a board bent in the opposite direction and screw it onto the opposing wall. The problem is finding convex boards. They always run out first. Concave boards, for some reason, are not nearly as popular.

 

[Nyfniken]

It's hard not to start wondering. How warped is the record really?

 

[Skogsbullen]

What are you going to use it for?

I will be screwing up hooks and mounts for various tools and equipment. The walls in the garage are just studs and drywall, so something sturdier is needed to screw into.

 

[Skogsbullen]

It's hard not to start wondering. How bent is the disc really?

Like a standard banana. Chiquita.

 

[Skogsbullen]

A final report from this:

I placed the board with about 50 kg of weight on its "back" for a couple of weeks in the garage. It actually had no effect at all on the shape. In the end, I gave up and screwed it up as it was. With sturdy screws in all four corners, it was pressed flat against the wall. And yes, the wall is still straight...