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Backyard shed

po1973

Member
Joined
Mar 13, 2008
Messages
8
The purpose of this structure is to serve as a studio/office structure for my wife. Here are the specifics: 12x16 footprint, 2x6 walls w/R19 insulation. Poured concrete foundation on top of 12” of crushed limestone rock. Slab floor approx. 4 inches thick with 2” of blue high density foam board underneath. Also placed 5 mil vapor barrier under foam to minimize moisture movement. Placed 1” foamboard around inside of foundation as slab contains ½” PEX tube w/oxygen barrier. PEX is made of 2 loops, each being approximately 100 feet in length. Heat is provided by an electric tankless boiler, a 27,000 Btu unit run on 40 amps @ 240 volts. Power supplied to she was via 6-3 UF from house, trenched 100 feet to shed location. Enough power for boiler, outlets, ceiling fan, etc. See pictures below. Siding is Hardiboard placed on OSB sheets covered with tarpaper. Roof is 7/12 cathedral with (only) R19. There are 3 double hung windows, 2 awning windows and 2 skiylights in addition to a 36” man door. All windows were obtained from local HomeDepot for the closeout price of $52.50 each! Door was double that but not bad for fiberglass unit. Not sure what the total $$ input is thus far, been working on this for the better part of 7 months part time. Will fire up the heat this week for first time. The system has been filled with RV antifreezed and ‘topped off’ to 30psi which will be lowered to 15 psi. Vapor barrier and sheetrock this week as well.

Oh, by the way, my 'shed' is a 2 car detached garage warmed by a woodstove.
 

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Dragster Racer

Well-known member
Joined
Feb 9, 2008
Messages
1,891
Location
Morrison, IL
Man. That's a pretty complicated mechanical system for a building of that size. I would have been tempted to do two baseboards and call it a day! Very nice.
 
OP
P

po1973

Member
Joined
Mar 13, 2008
Messages
8
Baseboard 'electric' or 'hydronic' were both options as I've got hydronic in the house; however, due to the distance from the house (100') and the need to protect from freezing (Minnesota), I chose to go with the slab-electric. I acquired all parts from online and local stores; I had to run juice out there anyway, so I thought why not step it up to 60a vs. 30.

Since the boiler will be running space heat in the winter, I'm debating tying into the system for a custom built hot tub in the coming year (spring-fall use). Would need to pump the liquid through a heat xchanger but I think it's doable. Time will tell.

As for the size of the structure and heating, it's definitely overkill but then I think about an "addition" for other endeavers such as wine or beer making or outboards or lawnmowers or tractors, woodworking, kids' fort etc.

Hydronics is a hobby...
 
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