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Small Workshop In Chatham County, NC

Mudbone

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Apr 18, 2012
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92
UPDATED 8/8/2012 Added Slab Pour

This is story of how a project can grow and grow on you. Any of you guys out there about to start a build, don’t let your wife read this.

I started this small workshop/storage building/garden shed because I had too much stuff in my attached garage. I couldn’t even get my lawn tractor in there much less either of my cars. The attached garage is not finished on the inside either. I am working on that as well. That build is shown in this THREAD. I eventually want to have a workshop around 1500sqft for auto work. But that is not in the budget right now. When I do get that larger shop built, I don’t want to be storing my lawn and garden equipment in there anyway.

Thus, I needed a small storage building. I started looking at the various pre-build wooden sheds that are available. To get one in the size I wanted, around 16x10, with the features I was looking for, including electrical and a garage style door, was going to run at least $5000. And it may have been closer to $6000 by the time it was in place and all paid for.
So I started looking at building it myself. I decided to take it to 16x12 because that was full sheets of plywood for the floor and it also could still be transported on a trailer if I decided to sell it or move it later. I also decided to build the floor so that it would be capable of supporting a car, so the building could be repurposed. After calculating the cost of the treated lumber to build the floor to these specs, and asking myself if I would ever really move this “shed”, I decided to make it a permanent structure on a concrete slab. You can see where this is headed….

Since it wouldn’t be moved there was no reason to limit the size to 12x16. I figured if I made it a bit bigger, I would have room to setup a work bench for small jobs. Also, I am a beekeeper so this building could double as a honey house when I need to extract honey. I finally settled on 14x20 with a 9 foot garage door on a 14 foot side. My original plan was to pour a monolithic slab. I plan to use Hardie Plank for the siding which requires a minimum of 6 inches between the bottom of the last board and grade level. Thus, the top of this slab would need to be approximately 7 inches above grade. I was going to put a stucco coat on the exposed edge of the slab.

I had a local grading guy come out with his mini excavator to dig for the slab. When we shot the site with his transit, we discovered that the difference in grade from the high corner to low corner was 22 inches. :eyecrazy: ****, ****, ****! That meant I was going to have 29 inches of solid concrete out of the ground on that one corner. Not only would it look like the back end of a mangy dog, it was going to be somewhere between 20-25 yards of concrete. For reference a 4 inch slab 14x20 is about 3.5 yards. So after about 45 minutes of discussion, (while I was paying for excavator time), it morphed into a traditional block and brick foundation on a footer with a pad poured on top.

I didn't manage to get any inital pics. In this first pic we have already started the foundation wall. It's a 4 inch block with brick veneer. The brick is run two courses above the last block and the pad will be poured level to the top of the bricks. You can see that the slope of the site required a step down in the footer.

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Here is the finished foundation. I used 8 inch block where the door and ramp will be in the front. Those blocks are filled in with mortar, (both courses), and the rebar sticking up will go in the edge of the concrete pad.

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These next two pics show the detail where I ran piping for water and conduit for electrical in the front corners. They are run up the front of the block and the brick is cut to fit around them so that they will be located inside the finished walls. You can also see the ladder wire I used between the last two courses of brick. This will tie them into the pad when it is poured.

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I have some additional pics if anyone wants to see another angle or a close up of a different section.
 
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Mudbone

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Anyone else having problems seeing the pics? They are loaded into an album here on GJ.
 
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Mudbone

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Well I finally figured out why I was the only one who could see the pics and got that straightened out. So we can continue.


Now that the foundation is finished, here are the next steps to get ready to pour the pad. The center of the space was back filled with left over brick and block pieces and some large chunks of concrete I had laying around. But it was mostly filled with washed gravel. The size is called 57s here in NC. It took several cubic yards. We screeded it level with the top of the block. The concrete will be poured on top of the gravel and block and be level with the top of the brick.

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So that I wouldn't have any condensation on the pad, I put in a vapor barrier. It is 6 mil black plastic.

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As you can see in the previous two pics there is another footer trench in front of the building. This is for the ramp. When the original plan for the foundation was a monolithic slab, I planned to add the ramp later. It would be poured in front and not be tied to the mono slab. When the plans got changed on the fly, I did not take into consideration how this might affect the ramp. In addition, at the digging stage it was difficult to visualize how high the foundation would be and thus how long the ramp needed to be so that it wouldn't be too steep. Once the foundation was up, I could see I was going to have a huge sidewall on the ramp on right side. See the pic above to get an idea. I really didn't want to be looking at all that concrete so I decide to brick the sides of the ramp as well. After some discussion with the mason and few concrete guys, it was decided to put the ramp on a footer. The concern was that a ramp this size would tend to sink or shift around if only the back edge of it was sitting on the building footer. In addition it would be easier to lay the brick for the sides with a footer. Since we had to pour the slab anyway, we decided to pour the ramp footer at the same time. After some measuring, I decided to make the ramp four feet long.

If I had it to do over I would have dug the ramp footer trench at the same time as the building footer trench and laid the brick for the ramp sides as part of the foundation. Then the brick would be locked in to the corner where the ramp meets the foundation.

Here is a pic of the rough trench for the ramp footer. Because it got dug later we used a backhoe on a tractor that had a narrower bucket than the one used on the excavator for the building footer. This saved me a some concrete. Notice that I had to put a step in the ramp footer just like I did for the building footer.

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Here is a pic of the footer cleaned out and ready for the pour. One upside to how this worked out is that I could "round up" the amount of concrete I needed and the rest could just go in the bottom of the ramp. You can see that I have installed a drain pipe that will run under the ramp. (It hasn't been leveled yet in this pic.) The ground in my yard does not drain as well as I would like. Facing the building, the gound slopes up to the left. Thus water will be running into the left side of the building. I plan to install a french drain to collect this water. The french drain will plug into the pipe on the left side and the pipe will plug into the lower french drain on the right side. This will allow the water to run under the ramp instead of piling up on the side of it.

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Mudbone

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Here are some of the finished slab pour. The slab is around 5 inches thick because we had two courses of brick above the last course of block. I had them put in two expansion joints, no filler, just troweled in. They divide the slab in each direcion. If I had it to do over again I might have had them run two parallel joints in the 14 foot direction, dividing the slab into thirds and not put one in long ways. This way there wouldn't be a joint that projects out under the garage door. I plan to fill the joints so hopefully this won't be an issue. The wood that you see on the top of the brick and a bit of the slab is a jig to hold the wall anchors in place.

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This is the ramp footer. You can see the step in it. That bit of concrete against the block wall is overrun. I figured I might as well dump it in there and take up some of the volume of the ramp.

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This shows the wall anchor/strap system that I am using. It's made by Simpson Strong Tie. This is an alternative to using J bolts. The 2x4s are there as a jig to hold the straps in the correct place. They are right in the edge of the slab. This allows me to have a 2x4 wall that goes to the floor and sits mostly on the brick. If I had used J bolts they would sit further in the slab and I would need to use a 2x6 mudsill. Then I would have to have a 2x6 wall or the J bolts would be outside of the wall covering. When the wall goes up, the wood blocks will not be there and the "ears" of the straps will be bent over the top of the mudsill/floorplate and screwed on the face and the top. The brick and the mudsill are both 3 1/5 inches wide. The mudsill is off set to the inside by about 1/2 inch so that the sheathing will be flush with the outside of the brick.

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Here is a rear shot of the slab and foundation. In the lower left you can see the step that had to be put in this side of the footer to match the one on the front and in the ramp footer.

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Mudbone

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Apr 18, 2012
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92
Thanks for the kind comments guys

This is not your first rodeo. Great work!

The funny thing is, this IS my first rodeo. The house is my first house and I bought it second hand so I wasn't around for the construction. Now, having said that, I am a real estate broker. I have many associates and aquaintances that are builders, home inspectors, other building tradesmen, and even one or two code inspectors. Unlike a lot of brokers who spend their time on what color is the bathroom or does it have stainless appliances, I tend to focus on will it fall down, and when will the HVAC and roof need replacing. And when selling new construction, I do vist the site from time to time to see how things are being done. So I have seen many ways to do it wrong and a few ways to do it right.
 

ArchAmy

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Jul 22, 2014
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Update request!!!

Mudbone, I'm curious too how this project turned out now that it's approaching 2 years. We are currently putting in a small storage building (10'x10') but next summer hope to build a detached garage. We'll have to follow some city codes for foundation (and get a permit if we do a slab), but other than that, I think it's pretty flexible here as to the size & style of building. We also have a drop that could be a similar situation you faced. That's why I'm curious to see the final product.
 
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