Workshop #3: What to do about un-even concrete floor? Dust collection and electricity

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Blog entry by Matt posted 03-19-2016 01:36 AM 1260 reads 0 times favorited 4 comments Add to Favorites Watch
« Part 2: Paint on the walls Part 3 of Workshop series Part 4: LET THERE BE LIGHT! »

Hi all,

Today was kind of a big day. At least, I spent a lot of money… I used a 20% off coupon on a 2hp dc unit from HF and added an accessory kit to get me going. I also grabbed a couple of clamps while I was there just for good measure. That’s how the day started. It ended with spending about $200 at HD picking up electrical supplies (on top of the $150 I already spent on electrical and lighting – don’t tell my wife).

I’m going to add 3 new circuits for the shop, each 20A:
1) dedicated to the DC unit
2) left side of shop (2 outlets, 1 dedicated to the tablesaw)
3) right side of shop (5 outlets for general use)

It is probably a little overkill, but I figure it gives me room to grow.

Tonight I will go down and spray the last coat of paint which will put me in good shape to do the electrical install this weekend. With luck I’ll be working wood in the shop next weekend.

There is one thing that could slow that down…. this garage is built over an old patio that settled and the floor is not really too level. It may have been pitched to shed rain when a patio. I’m not sure if I should do anything about that. I would have to put down some kind of sub floor, which I’m not keen to do. I will definitely need some kind of moisture barrier there if I do that dure to cracks in the floor.

I’m thinking maybe I’ll just leave it for now and see. If needed I can retrofit later I suppose. I’m mostly concerned about lining up and leveling work surfaces (assembly table that will work as a tablesaw extention).


-- I do this for fun.

4 comments so far

View Combo Prof's profile

Combo Prof

3992 posts in 1884 days

#1 posted 03-19-2016 04:41 AM

I would put down a vapor barrier then lay sleepers putting foam board between the sleepers. The sleepers are not nailed or screwed into the floor. They just float. On top of the sleepers lay 3/4 inch underlayment screwed into the sleepers. First adjust the sleeper heights so that in the end the floor will be level. For sleepers I used pressure treated 2 by 4s. I your case I think you could just add shims to level the floor or you could first poor self-leveling concrete resurfacer to level the floor. see this.

The wooden insulated floor will keep your feet warmer in winter and protect tools from breaking when they fall to the floor.

-- Don K, (Holland, Michigan)

View TheFridge's profile


10859 posts in 2093 days

#2 posted 03-19-2016 04:50 AM

Dedicated means a circuit strictly for that equipment. You’re on the right track though. definitely the saw and DC by themselves and another ckt for general purpose would be fine because it’s rare to run 2 portable electric hand tools together.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Grumpymike's profile


2439 posts in 2922 days

#3 posted 03-20-2016 09:36 PM

+1 with Don K.
Because I have a garage door on my shop, City Code says that the front 1/2 of my shop had to have a slope to it that facilitates water runoff … As unhappy as I was with that rule at the time, it has proven to be of little bother.
I have adjustable feet on everything, and even on a mobile base I adjust the machine to be level.
Some woodworkers like the wood floor because it’s easier to stand on but I use the fatigue matts and get the same results … (imho).

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

View Matt's profile


190 posts in 2025 days

#4 posted 03-20-2016 10:46 PM

thanks for the feedback guys! I like the idea of the wood floor… I may need to do that… Might be next year though.

-- I do this for fun.

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