What's the deal with Cold Storage Door?

[Mattsan33]

Hello

I'm looking to buy a door for my storage room and am considering different options.

Some doors are specified to not allow indoor temperatures above 10 degrees, and I don't quite understand the reasoning behind this specification.

1: It could be from an energy perspective that having a poorly insulated door wastes energy. I don't really believe this is the case, but I'm not sure.

2: Something about the dew point causing the door to rot if it's warm on the inside but cold on the outside. The manufacturer should be able to solve this by adding a plastic film on the warm side of the door to keep the warm air inside, which shouldn't significantly increase the door's cost.

Does anyone know what the reasoning is?

 

[Jörgen Ö]

Well, it's more that if you want it warmer indoors, the door can't keep that warmth; you should have a better-insulated door. A kallförrådsdörr is exactly for cold storage!

 

[falkn]

Although they probably don't specify an upper limit? There are probably recommendations on the door U-value versus indoor temperature. Of course, you can install a cold storage door on a warm storage, but then you're just heating for no reason.

 

[[old rusty]]

I have believed that it is because the door warps.
If you are going to make a door/gate out of wood properly with different temperatures on the inside/outside, you have to keep splitting and turning the wood pieces so that the forces cancel each other out..

 

[Mattsan33]

But they don't specify any upper limit? It's recommendations for the door's U-value versus indoor temperature. You can of course put a cold storage door on a warm storage, but then you're heating the outdoors.

Check out for example:
https://www.bauhaus.se/kallforradsdorr-8x19-vanster#go-to-description

Unfinished cold storage door with vertical grooves. The delivery includes a 93mm wide frame in unfinished pine, as well as a threshold also in unfinished pine (the threshold is integrated into the frame). A cold storage door should be used for spaces that are not heated, or at least do not have more than 10 degrees indoors.

 

[falkn]

Check for example at:
[link]

Untreated kallförrådsdörr with vertical grooves. The delivery includes a 93mm wide frame in untreated pine, as well as a threshold also in untreated pine (the threshold is integrated into the frame). A kallförrådsdörr should be used for spaces that are not heated, or at least do not have temperatures higher than 10 degrees indoors.

What they mean is that the space will not be able to retain the heat.

 

[Mattsan33]

Good, Thanks for the input