Another passed inspection. More issues.

I think we squeaked on this one. The only thing really done was the UFER ground. It passed fair and square. The rest of the inspections were around the garage slab. While that was supposed to be done, it really wasn't. I was at the "construction ofiice", also known as DnT's house, dealing with the our new issue when the inspector came, so did not experience the interplay. Net net we would have passed anyway in a couple of more hours. I think we got by on the trajectory of our previous inspections and the two generations of reputation of our concrete sub. However, we passed. The pour/pump is tomorrow at 05.30 and it'll be a big'n.

On to today's issue. Avid readers will recall me bragging on the quality of the slab and footings. What we have learned, starting yesterday, but the full import settled in today, is that while the slab and footings are in fact grade A, their coordinate system is different from the one we are building the house in.

Seems the slab is out of level on the order of 4 inches from the North West corner to the SE corner.

There is a little story behind the chart. When we decided to fully understand the scope of our issue we started to shoot the corners. What that means is there is a surveyors level set-up on a transit. They also have fancy laser stuff that they use to set the rebar, but the level was available and set-up in a useful spot. They hold a tape measure vertically from the corner of the slab, technically the stem wall that contains the slab, and the guy running the level calls out how far it is from his level line down to the slab. If things are level, the measurement are the same.

As we begin the process, the guy shoots the level and starts to write the number on his glove. I figure this is going to go bad, so I get the pen (a Sharpie, you can do anything with a Sharpie) and write the numbers on the concrete in the associated corner. We're computing differences in our head. I think, aaahhha, I have a computer down in the construction office. So I build the spreadsheet. The concrete guys are kind of impressed on the one hand, but I lost a fair bit of street cred that I've been building up...

So what the sheet says is that there is a drop of 1.38 inches between the North West and North East corners. You can read the chart for the rest, but we got a big problem. Now, we did not expect the slab to be perfect. But. We did expect it to be in a rectalinear coordinate system. It seems to exist in some curved system that we will need some mathematicians to define. Meanwhile, we engineers need to sort something out...

We can lose an inch or so in the framing process and use some leveling compound to build-up the floor. 4 inches is a whole lot to cheat out! Teleconferences were held. CtC is on the road to Colorado (ya, I stay in this heat and he goes to Colorado, Granby freaking CO where it will be wonderful this time of year. I'll whine about that some other time). We knew we had real good concrete guys. Turns out where they do most of their work is complex stuff. Pouring footers and slabs in the barrio is child's play. So they're exactly the right guys to sort this out.

So, I've not seen a budget yet. But, the plan is to frame-up the existing stem wall and pour a level slab over the old one. Now this is pretty advanced since the new slab will actually be pretty thin as it nears the North West corner. If you put too much reinforcing, the slab will crack. Too little and the slab will crack. Apparently they use a combination of steel where the slab is thick (the South East corner) and fiberglass netting and fiberglass fibers mixed into the concrete.

Pretty cool.

From the get go, we really wanted to do a concrete floor but couldn't because of the mastic left on the concrete from the original flooring that was glued down. Now we have a fresh slab and will do concrete flooring. We'll stain and polish the new concrete and that will be the finished floor. Be colder than cold in Colorado (where CtC has fled), but perfect for here.

More as the issue resolves...

Back to the Colorado front. FtF too went to Colorado a week or so ago. For a visit before we started framing. Seems FtF has decided Colorado suits him and has abandoned the project. CtC has a Plan B framer who, of course, costs more...