Trenching, backfill, pipe bedding, compaction, and post-installation cleanup. The complete skid steer attachment picture for irrigation installation across Canadian soil conditions.
Irrigation installation is one of the most attachment-intensive landscaping tasks a skid steer handles. You're trenching through established turf, laying pipe at precise depths, backfilling without crushing the pipe, compacting without settling the lawn surface, and cleaning up afterward without leaving evidence of the disruption. Each phase requires a different attachment — or at least a different approach — and getting any of them wrong creates callbacks and rework.
Canadian conditions add layers. Irrigation is primarily a warm-season installation (May through October), but the soil conditions during that window vary enormously — Prairie clay that bakes hard by July, BC rocky soils that destroy trencher chains, Ontario loam that's excellent until it isn't, and Maritime soils that are often wet enough to make machine traffic a rutting problem. The right attachment for your soil type isn't always the same as what your neighbour's irrigation contractor uses.
The minimum burial depth for irrigation laterals (the pipes running from manifolds to sprinkler heads) is typically 150–200mm in most Canadian municipal standards — just enough to protect against surface damage. But the mainline (the pressurized supply from the backflow preventer to the zone manifolds) often needs to be deeper, and if the main is on the building's domestic water supply connection, it needs to clear the frost line entirely.
Residential irrigation systems in most Canadian provinces are designed with a winterization blow-out in mind — the entire system is drained with compressed air in fall, so burial depth below the frost line isn't strictly required for the irrigation piping itself. But crossing paved areas or going under driveways often requires deeper placement for protection against surface loads, and local inspectors have their own interpretations.
| Application | Typical Burial Depth | Notes |
|---|---|---|
| Lateral pipes (residential lawn zones) | 150–250mm | Enough to protect from surface traffic; shallower is faster but risks damage from aeration equipment |
| Mainline supply | 300–600mm | Deeper for frost protection, especially in Prairie provinces; verify with local standard |
| Under driveways / hardscape | 450–600mm minimum | Protect against vehicle load and frost heave; sleeve the pipe through conduit under driveways |
| Commercial / sports field systems | Typically 300–500mm | Commercial systems often designed by irrigation engineers with site-specific specs |
The chain trencher is the primary tool for irrigation lateral trenching. It cuts a narrow, clean trench — typically 100–150mm wide — that minimizes soil displacement and surface disturbance. For a residential property with an established lawn, the difference between a chain trencher and a bucket trench is enormous: the trencher leaves a narrow slit that can be backfilled and closed almost invisibly; a bucket trench leaves a 300–400mm wide gash that takes a full growing season to fully heal.
Trench width matters especially when cutting through established turf in front yards or formal gardens. Irrigation contractors on high-end residential properties often use a 4-inch (100mm) chain specifically because the narrower disturbance is easier to restore. The trench width is set by the chain and bar combination — check the trencher's available chain widths and select accordingly.
Depth capability is the other variable. A compact skid steer chain trencher in the 900–1,200mm depth range covers all residential irrigation work and most commercial lateral trenching. Beyond 1,200mm you're typically into commercial mainline work where a dedicated trencher machine or an excavator is more appropriate than a skid steer attachment.
Rocky soils — present extensively in BC's Interior Plateau, parts of the Canadian Shield in Ontario and Quebec, and scattered through Atlantic Canada — destroy chain trencher teeth rapidly. In rocky soil, a chain that would last a season of soft-soil irrigation work can wear out in a single project. Rocky conditions are where a narrow bucket or a compact excavator often wins over a chain trencher in total cost.
Compacted clay soils in summer (Alberta Montmorillonite clay, the heavy clays of southern Ontario) also challenge standard trencher chains. Carbide-tipped chain teeth cut harder materials better than standard teeth and are worth the premium on these soil types. See the trencher attachment guide for chain configuration details.
Irrigation pipe backfill has different requirements than standard trench backfill. The pipe needs to be surrounded with fine material — preferably native soil free of large stones — that supports the pipe uniformly without point loads. Large gravel or clods of clay backfilled directly onto irrigation poly pipe will eventually compress and crack the pipe at the point loads.
A standard bucket works for backfilling long, straight trenches. The technique matters: place material in the trench gradually rather than dumping the entire spoil pile back at once. A bucket can be used to push spoil back into the trench carefully, or to pick up stockpiled spoil and lower it in gently. You want fill rate that lets the operator verify the pipe is staying positioned correctly rather than flooding the trench and hoping for the best.
Where the native spoil contains large clods or stones — very common in Prairie clay and BC rocky soils — running the spoil through a soil conditioner or power rake before backfilling produces finer material that beds the pipe better and settles more uniformly. This adds time to the project but reduces callbacks from pipe damage or settlement in the trench line that shows up as a depression on the lawn surface the following spring.
The trench surface compaction step is frequently skipped, especially on residential work where the homeowner's grass is already disrupted and the operator wants to minimize additional surface disturbance. But uncompacted trench backfill settles over the first few rain events and frost cycles, leaving a visible depression that runs the length of the trench. In Alberta and Saskatchewan, freeze-thaw heaving through the first winter after installation can be significant in uncompacted backfill.
A skid steer plate compactor compacts the backfilled trench without requiring a separate pass by a walk-behind plate compactor. The attachment travels along the trench line, compacting in lifts. For established lawn areas, a rubber-padded plate or a plate with rounded edges is preferred over a bare steel base plate to avoid surface marking.
Compact in 150–200mm lifts rather than trying to compact the full trench depth in one pass. Two or three passes over 150mm lifts produces better compaction than one pass over a 400mm fill depth.
Irrigation work in established residential properties involves constant cleanup: spoil deposited beside the trench, wheel marks from the skid steer tracking through turf, disturbed mulch beds, and the general mess that comes with mechanical digging in someone's yard.
After backfill and compaction, excess soil needs to be either spread over the trench area or loaded and removed. A power rake attachment on the skid steer can spread and level excess backfill material efficiently — much faster than hand raking across a 100+ metre trench run. It also breaks up surface clods left by bucket or trencher operations and creates a seedable surface for overseeding the disturbed area.
A 48-inch compact bucket handles spot cleanup — picking up debris piles, removing excess spoil from mulch beds, repositioning edging or border materials displaced during the trenching. The smaller profile is essential in tight garden areas where a 72-inch bucket would cause more damage than it prevents.
Landscaping contractors in Canada increasingly own or rent a skid steer specifically because it makes irrigation installation faster and more profitable than hand-digging or specialized irrigation equipment alone. The skid steer with a trencher handles the primary trench work at a rate that justifies the machine cost compared to the alternatives.
The investment in attachments for irrigation work typically includes: a chain trencher (the core attachment), a soil conditioner for post-trench work, and a plate compactor for backfill. On a busy landscaping season in southern Ontario, BC Lower Mainland, or Alberta's urban corridor, those three attachments see continuous use from May through October.
Chain trenchers, soil conditioners, and plate compactors for irrigation and landscaping work.