Mystery Hill House Construction

Things have progressed quite a bit since the last post. Richard and John from B&C construction along with Michel did most of the work. First, they continued laying down row after row of ICF blocks. Once this got to 4 rows of blocks (about 5 feet high), they started installing the special ICF bracing. The bracing is pretty cool as it not only supports the walls, but also creates a scaffold that you can walk on to install the higher courses.

 

We initially had rented 50 sets of braces. This turned out to be well short of what we required. Richard had to call various contacts and in the end we obtained another 60 sets (for a total of 110 braces). Richard, John and Michel continued installing the bracing and the blocks; this turned out to be more time-consumming than expected due to the complexity of the house.

Initially, we set as a target to pour the walls on June 22, but as the week progressed it was clear we would not be ready – so we re-booked the concrete and pump for the Monday (June 25). Even with the extra days, Rene, Richard, John and I had to work non-stop on Saturday, Sunday and Monday morning to be ready for the pour. This is how things looked on Monday morning:

For the day of the pour, we had a total of 6 people – Richard and John (B&C), Michel, John Marquardt, Rene and myself. The concrete pump showed up around noon – we got going and poured until 7:30 that night.

This was a very large pour but all went quite smoothly – no blowouts or major problems – but it was a long day. In the end, everyone was happy with the result:

Now we have to move on to the next stages: remove the bracing, clean the site, install the waterproofing and install the floor. After that, we will be ready for the second ICF story and the timberframe.

Out of interest, we have been keeping statistics on the materials we have used. This is how the basement stacks up:

• 500 feet of wall 
• 750 ICF blocks
• 38 corners and angles
• 110 braces
• 7000 feet of rebar
• 64 metres of ICF concrete
• 3 weeks to build and pour

This is of course on top of what was used for the footings – 27 metres of concrete and 1000 feet of rebar.

Marco and John came back this week to survey and mark the house corners on the footings. After that, the ICF folks started laying down the blocks, starting with the more complex parts of the layout. Here’s a couple of pictures showing what this looks like:

 Rene came to visit for the weekend; we worked to take apart the formork for the footings. This was a pretty difficult job, having to pry and dig out the stakes. It took a whole day to completely dismantle the forms (this took Michel 3 weeks to build). Here’s all that’s left of the forms:

Rene and I also installed most of the drain, covered it with gravel, and started leveling the crushed stone in the basement floor.

After lots of last minute preparation, we were all set to pour the footings Saturday morning. The concrete pump was scheduled for 7:30 AM with the first concrete truck set for 8AM. The pump arrived as scheduled and got set up.

 We had lots of help lined up: Michel, John, Derrick, Brian and Linda. The day was cloudy and humid, perfect conditions!

Things went very smoothly, we were basically done pouring the concrete by 11AM.

 

The end result – the completed footings!

Michel spent the last couple of weeks completing the formwork and levelling everything. The was grueling work (there is almost 500 feet of footings with many steps and angles); he worked relentlessly to get this completed for Saturday morning’s pour.

For the forms, we used the FastFoot product (a plastic membrane that holds the concrete). It has several advantages – first, the formwork is built with 2×4 suspended above ground (instead of full 2×8), making it easier to level and place the forms. Second, the plastic membrane stays in place after the pour, providing a continuous moisture barier below the footings and the floor slab. Although not required, we also installed rebar in the footings for added strength and crack control. Here’s an example of what  the formwork with the Fastfoot product looks like (you can see the future screened-in porch in the back):

Here’s another picture that shows the plastic membrane used for forming steps:

We had the building department inspection and the engineering (geotechnical) inspections Friday afternoon. Both passed and were are have the green light to pour the footings.

Michel, John and I worked late Friday night and started again Saturday at 5AM to finish the Fastfoot and rebar installation before the concrete and pump shows up at 7:30 Saturday.