Can this warped door be fixed, or is it best to have it replaced?

[Potatan]

This door was fitted to my garage around 7 or 8 years ago, but lately it seems to be warping very much out of true. See the pics of the bottom rail angling away from the side stile (batten added for emphasis). The door has always been noticeably stiffer to open and close in the winter (it scuffs and catches on the lock/handle side), but usually perfectly functional in summer. I've always put this down to expansion in the damper weather.

This summer however the warping has appeared as shown, which seems different.

Not entirely sure of the cause, but possibly poor application of the stain that doesn't seem to have gone into the gaps between the panels, possibly allowing water ingress and expansion over time. You can see in the full door picture that there are noticeable gaps in the stain.

Is there anything that can be done? I was thinking maybe I could remove the door and kind of clamp it true again with some sort of glue and clamps (which and which?) but I'm not sure if this is something that should be done to a door.

 

[foxhole]

It appears to be fitted in an exposed position , very likely the cause, you may be able to remove and make good but needs a drip bar and ideally a canopy to offer some protection from the weather .

 

[Potatan]

It appears to be fitted in an exposed position , very likely the cause, you may be able to remove and make good but needs a drip bar and ideally a canopy to offer some protection from the weather .

It's a pedestrian door to an old (1940s) concrete panel garage. Thanks for the advice

 

[foxhole]

It's a pedestrian door to an old (1940s) concrete panel garage. Thanks for the advice

That’s fairly obvious.

 

[Potatan]

That’s fairly obvious.

Well you seemed uncertain about where it appeared to be fitted, so I added a couple of details to clarify.

Any comments on how I could clamp it back together? I'm not familiar with the tools. I have a couple of sash cramps but I guess they are nowhere near strong enough for pulling a door back into true.

 

[foxhole]

Well you seemed uncertain about where it appeared to be fitted, so I added a couple of details to clarify.

Any comments on how I could clamp it back together? I'm not familiar with the tools. I have a couple of sash cramps but I guess they are nowhere near strong enough for pulling a door back into true.

Don’t know what gave you that idea.
Lots of online videos for the less experienced .