Shotcrete Shoring & Temporary Walls
Temporary shotcrete walls for basement and parkade excavations
Sprayed in lifts as the excavation goes down
Built to the shoring engineer’s drawings
Drawings, or just depth, wall length and a few photos of the lot.
Why shotcrete shoring on a tight infill lot
- One-sided: no forms or bracing on the neighbour's side of the lot line.
- Shot in lifts as the excavation goes down, so the cut face is open no longer than the sequence needs.
- Built to the engineer's temporary-support design where the depth calls for it (over 3 m under Alberta OHS Part 32).
Over 1.5 m deep next to a lot line? Send us your drawings.
Send my site for a quoteDrawings, or just depth, wall length and a few photos of the lot.
How we work on site
On loose or sandy soil we agree a staged dig-and-shoot sequence with your excavator before day one. Mesh is placed and the face is shot to the thickness range stated in your scope.
ACI-certified shotcreter (wet-mix) on our crew.
Excavation shoring: what the rules say
- Alberta OHS Code, Part 32. If a worker will be in an excavation more than 1.5 metres deep and closer to the wall than the excavation is deep, the employer must protect them by cutting back the walls, installing temporary protective structures, or both (s. 450(1)).
- Engineered over 3 metres. In an excavation more than 3 metres deep, temporary protective structures must be designed, constructed and installed to a professional engineer's specifications. The same applies to support for any foundation the excavation may affect (s. 456(1)(b) and 456(3); see Alberta OHS bulletin EXCV002).
- Locates first. Before the ground is disturbed or existing concrete is removed, the employer must contact the owners of buried facilities, ask them to mark the locations, and wait until the facilities are marked (s. 447(1.1)).
- City approvals. In Calgary, you need a Shoring/Backsloping Application through CROWM (Calgary Rights-of-Way Management) for any disturbance to City streets, lanes or utility rights-of-way. Work in a road right-of-way also needs a Road indemnification agreement and then an excavation permit. In Edmonton, most work on City road rights-of-way needs an OSCAM permit, and temporary use of City land, including ground disturbance, needs a Right of Entry Agreement.
- Who decides. Your engineer of record designs the shoring, and the authority having jurisdiction approves it. Enviro Shield builds the shotcrete shoring to the approved drawings and specifications. Safety program: COR in progress.
Sources: Alberta OHS Code · OHS Code Part 32 · Alberta OHS bulletin EXCV002 · Calgary Shoring/Backsloping Application · Calgary indemnification agreements · Calgary excavation permit · Edmonton OSCAM permits · Edmonton Right of Entry Agreement