Temporary heated storage

KristoSig · 2020-11-01T12:55:46+00:00

Hello! I have a short-term project underway. I need to temporarily store freshly dried furniture wood for a maximum of a few months. I know, wrong season for this, but in this case, the choice is between throwing the wood away or doing something NOW. I've considered various approaches here. Everything from wrapping with shrink wrap and storing outdoors to renting an insulated container. What I've somewhat settled on is building temporary storage with a heater that maintains about 18°C. The idea is that the wood will be able to maintain the right moisture level and even out (it comes out of the dryer with uneven moisture content). The wood will be 3.5 m long, so I'm thinking of having the storage about 3.7-3.8 m long. Approximately 1.2 m wide and 2 m high (internal dimensions). I will have some sheets of polystyrene (XPS) left over from the drying chamber. I thought I could glue them together to create a floor and, if I have enough sheets, a ceiling as well. This way, there is insulation from the ground and a barrier against heat loss upwards. The question is how to handle the space between the floor and ceiling. My initial thought is that it's not worth insulating the walls. We're talking about a space of maybe 10 cubic meters that needs to be kept at most 18 degrees above the outdoor temperature (Skåne, rarely goes below 0°C). Option 1: Just stack the wood and wrap with a tarpaulin on top of a polystyrene "pad" and then place another polystyrene pad on top, securing with straps. Heater inside the tarpaulin. Simplest. Probably cheapest. You would need a little frame around the heater to avoid fire risk, but nothing more than that. Ugly but functional? Option 2: Have posts of some sort in the corners. They can rest on a polystyrene pad and hold up another such pad. You could wrap a tarp around it, and thus have something approaching a small shed, a bit neater than just a pile of boards. You can have one short side openable, making it easier to have an overview of what's inside, find a board of a certain size, etc. Option 3: Framed construction. Polystyrene pad and ceiling. Framed walls, C-C 600-600 or 1200-1200 mm. One short side can be a "door" (door = a 1200x2500 mm OSB board with hinges on one side). A big advantage of this approach is that I have support for some "shelves," i.e., beams that go across from long side to long side. Then I could sort the wood on the shelves. Could go different ways with this: a) Tarpaulin outside of framed walls? Or maybe sheet metal? b) 10 mm OSB on the inside of the walls to get some insulation from air inside the walls? c) Do I need ventilation? Some air holes somewhere? Or two? d) Sheet metal on top of the roof to protect the polystyrene sheets? Right now, I'm leaning towards choosing between options 1 and 2. Option 3 feels a bit like a waste of work and materials. One must keep in mind that this should stand for about six months and then go to the dump, plain and simple. Ideas? Opinions? Other options? How would you do it? Do you agree that a 2000 W heater with a thermostat should be able to keep the storage reasonably stable at 18 degrees? How do you think it will be with moisture? We have 90+ percent humidity in Skåne. How much condensation do you think there will be on the walls if they are just a tarpaulin? Will it be a problem, or will the heat loss there be significant enough that there won't be much condensation?

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Oldboy

#16

Member · Skåne

· 7 285 posts

3 Nov 2020 at 9:34 PM

Oldboy

Member

Skåne
7,285 posts

3 Nov 2020 at 9:34 PM

If the wood is more humid than the air, it will add moisture to the space, and there is a risk of condensation on cold surfaces.
The same principle that recommends a plastic/vapor barrier on the warm side of the house's insulation.

If the wood (or soil) does not add any moisture, there is no significant risk of condensation.

If the wood adds moisture, it can help to ventilate it away.

Temporary heated storage

Oldboy

Oldboy

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