Build a humidity proof shed.

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   I want to build a new shed 10x14, stick built, wood platform floor, t1-11 siding.

Storage of large machine parts, tools and steel.
Will not be working in there, limited access.

I don't need it to be heated, ok to freeze.
I want it to be humidity controlled. No rust allowed.
No windows needed. Wide entry door.
Will run electric to it.

Looking for ways to make it an "air-tight" box.
And cheap to maintain.

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BrianC Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 16 Jun 2011 Location: New York Points: 1619	Post Options Post Reply Quote BrianC Report Post Thanks(0) Quote Reply Topic: Build a humidity proof shed. Posted: 18 Dec 2021 at 8:24am
	I want to build a new shed 10x14, stick built, wood platform floor, t1-11 siding. Storage of large machine parts, tools and steel. Will not be working in there, limited access. I don't need it to be heated, ok to freeze. I want it to be humidity controlled. No rust allowed. No windows needed. Wide entry door. Will run electric to it. Looking for ways to make it an "air-tight" box. And cheap to maintain.

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jaybmiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 22487	Post Options Post Reply Quote jaybmiller Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 9:14am
	going to be a 'tough' build to be 'rust free' ! probably 2x6 walls, 2x12 ceiling joists, ROXUL insulation,vapor barrier SEALED. floor same thing, HAS to be insulated and vapoured... Door, again 2x6, insulated,good 'foam' seal gaskets. The problem is moisture..open door on a hot, humid day....it gets in, open door in winter, snow from boots gets in. Having a small fan circulate the air will help, probably need a small heater/baseboard on a humidstat. they make special impregnated paper that won't allow rust to form (Zerust ??) )
	3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water

BrianC Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 16 Jun 2011 Location: New York Points: 1619	Post Options Post Reply Quote BrianC Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 12:03pm
	I posted in the wrong forum. I don't know how to move it.

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 81338	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 4:30pm
	Your shed is not very big... Dont need big rafters.. Dont know if your in Upper NY or Lower, but if your not worried about freezing, then probably just humidity in the spring summer.. At least thats the way it is around here.. Wood does not "sweat" like steel walls/ roof... I think 2 x 4 walls with 2 x 6 joists or 2 x 4 made rafters should be fine.. Plywood roof would be better than steel for moisture. Insulate it with sheet foam or fiberglass . Put plastic on the ground before building the wood floor ........ I would use a small dehumidifier and set at 60% for the summer.... I have an in-ground work shop and thats what i use to control the humidity for 3-4 months out of the year...... Dont have humidity problems in the winter. Edited by steve(ill) - 18 Dec 2021 at 4:31pm
	Like them all, but love the "B"s.

DonBC Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Courtenay, BC, Points: 913	Post Options Post Reply Quote DonBC Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 6:07pm
	I would install vapour barrier on the floor system as well as moisture could be absorbed from the soil. A few decades ago I was involved in a project to preserve artifacts in small community museums that were closed during the winter months. The biggest issue was not temperature but fluctuating humidity that caused damaging moisture changes in organic materials when the room humidity changed. The solution that we came up with was humidistat controlled heating rather than thermostat control. A humidity sensing recorder showed that this system maintained an absolutely steady humidity with very little energy cost.
	Jack of all trades, master of none

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 81338	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 6:31pm
	Don, i saw where you talked about WINTER humidity, and i only have a SUMMER problem.. I looked up Illinois and similar to BC, the humidity is 65 in the summer and 70 in the winter !!! ........ I guess my problem is my shop is built into a hill side and the TEMP in the room is 75 degrees in august when its 95 degrees outside... That gave me about 90% humidity in the shop ! .... I used the dehumidifier to keep it down to 60% ... Good info from you.. I never looked at it that way.. I dont have a "winter" problem when it is 20 degrees OUTSIDE and 55 degrees in the shop !
	Like them all, but love the "B"s.

JohnColo Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Apr 2020 Location: Niwot, CO Points: 1258	Post Options Post Reply Quote JohnColo Report Post Thanks(0) Quote Reply Posted: 18 Dec 2021 at 9:00pm
	If it were me, I would look for a small reefer unit off an old milk truck. They can be bought used for around a grand or so. They are pretty much sealed and insulated so a dehumidifier wouldn't have to work very hard. It also wouldn't take much of an electric heater to keep it above freezing.

KRAKMT Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 21 May 2010 Location: MT Points: 99	Post Options Post Reply Quote KRAKMT Report Post Thanks(0) Quote Reply Posted: 20 Dec 2021 at 10:32am
	I picked up a shipping container, that I am in process of insulating. A dehumidifier might be good.

tadams(OH) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 17 Sep 2009 Location: Jeromesville, O Points: 10139	Post Options Post Reply Quote tadams(OH) Report Post Thanks(0) Quote Reply Posted: 20 Dec 2021 at 2:45pm
	That's what I was thinking a shipping container and spray foam insulation.

jaybmiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 22487	Post Options Post Reply Quote jaybmiller Report Post Thanks(0) Quote Reply Posted: 21 Dec 2021 at 6:15am
	yeah, there's literally MILLIONS of them on the west coast, you'd think they would be giving them away.... ..course up here, I need a building permit,engineers sig and a couple more hoops before I can legally have even a 20' one on my property.. I figured to insulate, cover in and out walls with 1" foam(r6) ,then spray all the rib 'cavities',in and out. That way only lose 2" on the inside,then 'pretty siding' outside.
	3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water

BrianC Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 16 Jun 2011 Location: New York Points: 1619	Post Options Post Reply Quote BrianC Report Post Thanks(0) Quote Reply Posted: 21 Dec 2021 at 6:31am
	Neighbor has various truck bodies. Not so much eye appeal. Everything in them is rusty. Books and manuals are moldy. I would expect this because there is no heating or dehumidifier system. Where I am, if the shed is 144 sq feet or less, no permit, no increase in real estate taxes.

Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41609	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 21 Dec 2021 at 8:54pm
	Only way to be humidity proof would be air tight , inert gas filled , or a vacuum container . Humidity is part of the air as one can see easily as water collects in a compressor or when released ice forms at air outlet from both compressed air escaping and air around the release point . Now you could seal the space as best as you can and use a desiccant drying packs , chloride packs , or put a dehumidifier unit in closed space . Like many people do a small light bulb in a gun safe , or storing welding rods in old refrigerator with a 40 watt bulb as heat source . or storing papers in old refrigerator with bulb inside on continually , as air holds water you need to heat or cool it so outside air can not condense below the dew point within the enclosure .
	Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful."