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Garage Day 17-23: Slab and Retaining Wall

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Whoa! I’m way behind on my garage posts, so I’ll make this a quick one. The next stage was to pour the slab and (east) retaining wall. Gold star for those who have been counting and knew this was the THIRD concrete pour. :)

Progress Timelapse (Day 17 to 23)

YouTube seems to have disabled direct linking HD-quality videos, so if you want to see the timelapse at 1080p, follow these steps:

  1. View directly in YouTube
  2. Click cog button near bottom-right of video window
  3. Select “1080p HD” from the “Quality” list
  4. Click “Large Player” or “Full Screen” button near the bottom-right of the video window

East Retaining Wall

The interior walls were poured using basic plywood forms with a snap-tie fastening system. However, because the retaining walls would be alley-facing, smooth-face forms with a cone-tie fastening system were used instead for a higher-quality finish.

Walls have been reinforced with a 1′ x 1′ grid of 15mm rebar.

Forms for East Retaining Wall
Rebar for East Retaining Wall
Forms for East Retaining Wall
Forms using Cone-Tie Fastening System

Slab Preparation

After the gravel layer was spread and tamped, 3″ foam board was used for insulation and 10 mil poly for vapor barrier. For reinforcement, a 1′ x 1′ grid of 15mm rebar was used with 6″ mesh for good measure.

While it’s common to see expansion joints cut (or stamped) down the middle of a slab this large to minimize cracking, instead there is a fiber-based expansion joint around the perimeter of the slab. You can see them attaching it to the wall on day 19 of the timelapse.

Slab Preparation
Slab Preparation
Insulation Foam and Rebar
Insulation Foam and Rebar

More Footings!

Extra perimeter footings were required for the bathroom, as well as one for the mezzanine support post, since it’s a point-load. I’m sure glad concrete is cheap.

Wait. No it’s not! :(

Support Post Footing Form
Support Post Footing Form
Bathroom Wall Footings
Bathroom Wall Footings

Slab Pour

The slab was poured using a line pump, levelled with a 2×4 and finished with the power trowel.

Power Trowel
Power Trowel Finish
Hand Trowel Touch-ups
Hand Trowel Touch-ups

Additional Photos

Flush-mount Drainage Cleanout
Flush-mount Drainage Cleanout
Rebar for West Retaining Wall
Rebar for West Retaining Wall
Custom Fence Post Blades
Custom Fence Post Blade
Custom Fence Post Blades
Blades inserted into wet concrete
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