I'm considering insulating an old-fashioned panel door by adding insulation on the inside of it.

I have a couple of such doors I want to do this with. One goes down to the basement and one in the garage.

What do you think about that? I got the idea when I realized that our exterior door of a new and luxurious brand was extra thick with an additional "extension" that went inside the actual depth of the part of the door that fits in the frame, so to speak.
 
It will surely look nice!

If it holds.
Are the doors exposed to rain? In that case, the old joints with cold glue might give way.
But under a porch, veranda, or something similar, why not?
Then why not just give it a try? Mount a 50 mm sala on the door, insert Styrofoam, and then a plywood board.

It can't be worse than it warping or falling apart :)

But I have never seen it IRL
 
I've done it on my old double doors. They were exterior doors before as well but just solid wood. Framed with 45x45mm mdd gullfiber and covered with thin plywood.

Keep in mind to keep the weight down.
 
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AnnikaF and 1 other
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Did so in the boiler room, framed it, placed in foam plastic, then covered with plywood. Has worked well for a couple of years so far.
 
Sounds nice, as usual one is not the first with a good idea :)

Moisture is what worries me the most. Not even our door from allmogesnickerier meets the mark on that point, even though it's under a roof. But when it rains, it always gets wet anyway due to wind conditions and that the roof is over a window above the door. We'll see if it can be better on the garage, the basement door is more sheltered.
 
JKrister said:
I did this on my old double doors. They were exterior doors before as well but just solid wood. I reinforced with 45x45mm mdd rock wool and covered with thin plywood.

Keep in mind to keep the weight down.
Do you have a picture of how it turned out?
 
Well, a bit lacking in pictures.
Color should protect sufficiently.
 
JKrister said:
Well, a bit lacking in pictures. Color should protect well enough
Oh, that's a shame. Because I'm not quite sure how to do it. I'm completely in line with Thomasx since the quality of my old doors is really good. But they insulate like a newspaper... :)
 
Jugend said:
Oh, too bad. Because I'm not really sure how to go about it. I completely agree with Thomasx since the quality of my old doors is really good. But they insulate like a newspaper... :)
Build a frame and put it on the inside of the door (assuming it opens outward). Add insulation and cover it with a board. Paint.

One thing to keep in mind is to have enough clearance against the frame so that the door can open and close :)
 
I built my own front door. Framework in fine pine, foam plastic, plywood on both sides to then cover the outside with horizontally laid, black-stained wide oak planks which I fully glued to the plywood. The phenomenon that occurred was that when I glued the oak, it caused the door to warp like a U and didn’t fit tightly against the frame. I got angry, took an axe to the door, and then off to the dump with the junk! 😂
 
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