Foundation Walls

It's time for another picture post! After the slab cured, it was covered up with a vapor barrier and the contractor started working on the walls. The contractor happened to have an almost brand new set of forms, so I'll have nice, smooth interior walls. 

Makeshift entry into the basement

Those are 9' high walls! The garage will sit directly above this area.

Setting up forms for the walls and a rebar lattice

After the forms were all set up, the concrete truck came in on September 29 and poured all the walls. Here's what it looks like after the forms came off:

The mechanical room

The main footprint of the house

Drainage pipes around the perimeter of the foundation

View from the driveway

It looks like an unfinished development in the Gaza Strip right now, but most of that will be buried underground. The next steps are to waterproof and insulate the exterior walls, back-fill the lot, and pour the final walls connecting the retaining wall to the house.

Foundation Slab

It was an exciting time at the site on Thursday! Starting at 8:30am, I got to see four large cement trucks navigate the narrow streets into my driveway to pour out the slab for the foundation.

The pour begins:

There's no turning back now! We can't even drill into the concrete after it has set because it would risk puncturing the embedded piping. Also of note in that picture is the 40ft coil of copper wire (lower right) leading to a Ufer ground setup in the foundation. That'll hook into the electrical box of the house. Here you can see the contractor directing concrete from the tube in the sky:

At the recommendation of the architect, we had "Seattle Sidewalk" pigment added to the mix to darken the slab. He said that concrete color matching is an inexact science, and he's had good results with that color in the past. It looks good in the photos!

Once the last concrete truck drove away, the troweling process began:

I was told they were out there until around 6pm. I can't wait to see what it looks like after it has cured! Next up are the retaining walls for the foundation.

Foam, Rebar, and PEX

After the gravel, the next step was to lay down a vapor barrier and cover the entire footprint of the foundation in a 2" thick layer of foam panels. 

Next step - take rebar...

...and tie it up in a grid.

Those red tubes you see there is PEX for the hydronic heating system. It's tied to the rebar.

All the pipes feed into the mechanical room of the house:

After this work gets approved by the city, it can be buried in 8" of concrete. This will hopefully happen later in the week!

Grading and Gravel

With the side sewer line installed and buried, it's time to focus on the foundation of the house. There's quite a bit that goes into creating it. The first step was to flatten and compact the ground. Next, the plumber installed the sewer pipes that lead to all the drains in the house.

After that, they brought in and compacted a 12" layer of gravel across the entire surface. This is to add stability and proper drainage to the ground.

While I was on site, I saw them prepare for the next step:

They're unloading 2" rigid foam panels. Those will be laid across the entire surface of the gravel in order to insulate the foundation from the ground. This will prevent heat from escaping the house through the foundation and will make the bottom floor seem more like a normal room, unlike a typical cold basement.

That truck also has a bunch of rebar. This will be installed above the foam layer to help strengthen the 8" thick concrete slab.

I have a sewer!

Not much has changed on the lot itself since the last post, but one big issue has been resolved. I started talking to the neighbor to the north of my lot about running a sewer line through their backyard. They were a little nervous about it, but they ended up allowing me to do it in exchange for a cash offering. What a relief! The sewer is still around 3x over budget, but it would have been closer to 6x otherwise.

With a signed easement in hand, my plumber went to work. This is the approximate path that the sewer line will take:

It's a bit of distance to cover, but it is all downhill and doesn't share any plumbing with the neighbor's house (other than the y-joint). First, he had to locate the side-sewer connection going out to the street.

From there, a trench was dug and a 6" line was installed along the edge of the neighbor's lot.

Here it is taking a corner:

..and another corner along the backside of the neighbor's property:

And finally, it needs to go uphill into my lot:

Next week should pick up again. We have picked out a new sub-contractor to finish the foundation work. My plumber will also be running the lines underneath the foundation and burying the pipe once it has been approved by an inspector. I can't wait for this phase of construction to finish.

Hole in the Ground

Progress is going slower than planned. There's a contract dispute between the foundation sub-contractor and my GC. Apparently, the sub-contractor had bid on the original set of plans, and not the one with the revised foundation. They were notified and given the revised plans 2 weeks prior to signing the contract, so the error wasn't on our side. I hope that this messy situation will be resolved soon.

In the meantime, in order to move the project forward, my contractor hired someone to haul out 45 truckloads of dirt to make room for the foundation. The geotech didn't allow for the existing soils to be used as back-fill, so that export was a major unexpected expense. I will probably need to go to the bank to re-negotiate the foundation-portion of my loan to account for all these new expenses.

Here's where we are so far. The south retaining wall is in, but there's no drainage or back-fill on it yet:

We also have a huge hole in the ground now. Here's what it looks like from the driveway:

A close-up:

Here it is in comparison to the duplex:

It's kind of hard to judge scale in the picture, but that is about 8 feet deep! One good thing happened - the owner of the empty lot adjacent to mine let me use his lot as temporary dirt storage. We promised to clear it out once the foundation was completed.

Driveway/Foundation Update

So what's happened since the retaining wall went in? Well first, by May 19th, they had taken out the existing driveway, graded it, and put down a layer of gravel:

A temporary slope was created to allow access for machenery:

Using the machinery, they cleaned out the lot and removed all vegetation:

By May 26, they started creating forms for the foundation. Here's the continuation from the retaining wall:

Looking into the lot from the driveway:

Forms being prepared for the other side of the foundation:

Here's the start of the retaining wall holding up the rear portion of the driveway:

Fast forward about two weeks to June 7th, and things start taking shape. Here, you can see the temp power pole and also how the retaining wall flows into the foundation:

That indentation is for the bridge to the entry of the house. Here's the same thing viewed from the other side:

Looking into the lot from the driveway:

The foundation wall connecting the two sides won't be put in until the basement is excavated. This way there is still room for digging equipment to get in and out. Here's what it looks like from the other side of the lot:

And finally, as a result of the failed sewer negotiations, I had to do something with the neighbor's crummy, and now under-cut retaining wall. The least expensive solution to prevent his wall from collapsing was to build a short concrete retaining wall and position it as close as possible to the edge of the shared driveway. Here, they're preparing the footings for the new, short wall:

I'll probably try to hide his wall with vegetation or something so that it doesn't look too out of place.