Building a piece on my workshop

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Forum topic by Wood_smith posted 08-01-2010 02:52 AM 982 views 0 times favorited 4 replies Add to Favorites Watch
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252 posts in 2447 days

08-01-2010 02:52 AM

You folks have become a great source of inspiration, both in woodworking and helping me (as well as putting up with me) market my pouches.
I want to keep doing the woodworking as well, and have decided to build a piece on to my workshop, which was a single car detached garage when I bought it. It is 14’ x 24’ and I want to add a piece on 12’ x 16’ deep.

I guess my question would be more directed to woodworkers in colder climates like mine (eastern Canada). I think the easiest way to build the base would be similar to a deck ( a 2” x 6” frame), it is raised up a bit and the floor would be approximately two feet above ground level.

To keep the heat in, I was thinking of adding plywood to the bottom of the floor joists (essentially boxing them in) and then having the open area spray foam insulated before adding the flooring sheets.

Has anyone ever done something like this, or if not, do you think it would be the best way to do the base? Pouring a cement floor and then adding a two foot high wall would be much more expensive, and more difficult than the method I’m thinking of.

Your ideas would be appreciated.

-- Lloyd Kerry; creator of the Kerry-All Pouch,

4 replies so far

View TopamaxSurvivor's profile


17577 posts in 3098 days

#1 posted 08-01-2010 05:10 AM

I would insulate it first.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View jusfine's profile


2405 posts in 2348 days

#2 posted 08-01-2010 05:30 AM

Well, in WESTERN Canada…it get’s pretty cold too! :)

Lloyd, I don’t know the full plan, but if it were me, I would utilize the additional space. Pour concrete, frame the walls (who needs more concrete), and create a storage space below your joists.
Maybe you access it from outside, and use it for lumber storage?
You will insulate the outside walls, even below the joists, and it’s perhaps less square footage than if you did the entire floor.

If you want to do it as a deck, you have the right idea.

Definately sheath the bottom of the joists first, then you can lay your insulation in neatly (instead of it falling in your face while you are underneath), and make sure you have an airspace under your plywood. Batt insulation would be much less expensive, at least it is here.

All the Best!

-- Randy "You are judged as much by the questions you ask as the answers you give..."

View dannymac's profile


144 posts in 2438 days

#3 posted 08-01-2010 03:03 PM

new england here.
i do this kind of stuff for a living. ok if ya don’t want to pour a slab you’ll have to atleast pour could use 12in. sauna tubes no more than 6ft. apart and i’d add a row down the center of your addition as well. unfortunatly your gonna have to dig a bit cause you need to get below the frost line, it’s 4ft. deep if your gonna build low to the ground home depot sells 2in foam panels lay those down and set your frame on top of them. you can for go the plywood on the botton of your frame and spray foam the insulation directly to the foam panels. now if your gonna build it up off the ground i would still lay the foam panels on the ground but you’ll have to build a knee wall around the base and insulate that as well, cold air flowing freely under you will rob you of heat quick. to be honest i would not use the spray foam on the floor or the ply underneath just get the thickest bat insulation you can it will be cheaper and work just as well. i don’t think this format will let me go into full detail so message me with any question you may have

-- dannymac

View TheDane's profile


4938 posts in 3085 days

#4 posted 08-01-2010 05:11 PM

Check buildinhg codes in your area to make sure you are in compliance. Where I live, you can’t use anything less than 2×8 for floor joists, and as dannymac said you need footings no more than 6’ apart. Pouring a slab might be the best solution, then if you want a wood floor (more comfortable in a shop), you could put it on top of the slab.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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