Squaring concrete pad AFTER the pour?

[jjscott]

I have a problem with the dimension of a concrete pad that my contractor poured. It’s for a 12’ x 18’ barn that’s going to be installed on top of it. The concrete pad is going to be the floor so the walls will be fastened to the concrete pad.

The barn company said the dimensions need to be 143” x 215” because the wood siding will extend below the concrete pad about an inch. So, the pad is supposed to be 1 inch shorter on each side than the overall barn dimensions in order to accommodate the siding. The wall sections and trusses have already been pre-built at their facility so it’s not like that can adjust their build on the fly. It is what is from their perspective.

The problem is when they poured the pad it looks like the forms bowed causing a large section of the pad to be about an inch wider than it should be. I would say there is about an 8-9 foot section of the 18 foot length that’s impacted.

Is there a way for the contractor to do something to bring it back to the proper dimensions without destroying the pad? I’d really hate to see them try and saw cut a precise line to achieve the desire result as they failed to cut a straight line for the control joints. Not sure if they could use a grinder or something of that nature to fix it. I have to meet with the contractor tomorrow so I just want to be prepared for his suggestions.

 

[The Cobbler]

ouch.

 

[Musicinabottle]

Two words....... Concrete saw.

 

[Farmall450]

Two words....... Concrete saw.

^^^^

 

[bad_idea]

Yeah. My concrete guy used a concrete saw to cut the control lines. Came out arrow straight. Should be a 20 minute job for someone that knows how to use the saw. I do believe you can rent one from Home Depot. If you don't trust him to do it, then ask for a reduction in the price due to the bad work and use that money to rent the saw and cut it yourself.

 

[PCustoms]

I'm my opinion you aren't going to want siding that close to the ground anyway.

Lay a course of block, or pour a small stem wall. You'll be better off to have 12" concrete then siding right at the dirt.

 

[bad_idea]

Very good point. I have seen sheds with the siding right at the grass level. Siding starts rotting in short order.

 

[jimindm]

One inch wider? You are building a shed, not a NASA platform.

I would think the bottom plate would still fit. I am not even sure You would see a half inch of runout along an 18 foot wall. I would bet there is more than that on most grage slabs.

 

[PWC Repair]

It happened on my buddies shop, they just snapped a line and cut it straight. My 30x48 on the other hand was less than 1/4” off anywhere.......my foundation guy was extremely precise.

 

[Hpozzuoli]

its absolutely doable. If 4”of thickness and under use a skill saw with a diamond blade. If it’s thicker than 4” then use the gas saw. Just keep everything wet and let the saw do the work. Cutting a 1”sliver off a slab is straightforward. Use a straight edge as your guide. I cut this hole with a gas saw inside a laundromat.

 

[1slow62]

Snap line and rent a K12 saw. Use water to keep the dust down.

 

[Firebrick43]

Jjscott. Your problem is really with the slab, as others have said a chalk line and concrete saw will fix the problem

The main problem is your contractor. If they didn't brace the forms correct nor cut the control joints straight WHY would you let them back on the property. Their either hacks or will be pissed being forced to correct it, either way you don't want them back.

Yea it ***** but either rent a saw and do it yourself or find another contractor to correct it.

 

[jjscott]

Thanks for the replies. It all worked out. The barn company said they see this quite a bit and sometimes much worse. They said the 1 inch variance will not be a problem for them. They came out on Tuesday and built the barn. Looks great and now I can unload a ton of stuff in my garage.

Thanks again