1 1/4 Minus and Bulk Aggregates for Mukilteo, WA

Washington Rock Supply provides gravel and aggregate delivery in Mukilteo, WA. The default surfacing material here is 5/8 minus, also called crushed surfacing top course, a crushed rock with the fines left in so it packs hard and sheds water.

Under it goes 1 1/4 minus, the crushed surfacing base course that carries load on soft ground. Both are ordered online by the ton or by the yard and tipped on your site.

Materials for Mukilteo Projects

Perched water is the driver on most Mukilteo drainage work. Rain soaks the loose upper soil, hits the dense glacial till below, and stops.

Water that cannot drain away has to be taken sideways to daylight, which is where washed stone does its job.

Washed stone has no fines, so it keeps its voids open and lets water move through instead of holding it. That property is what makes it the right choice for footing drains, French drains and curtain drains.

• Drain Rock, also called 7/8 clean or washed rock, for footing drains, French drains and infiltration trenches.
• 3/4" Crushed Stone, also called 3/4 clean, for trench backfill, pipe surround and under-slab drainage.
• #4 Crushed Stone, also called drywell rock, for drywells and heavy drainage.
• 3/8" Crushed Stone, also called 3/8 clean, for small drain runs and permeable paver joints.

Downspout runs are the other half of that work. A short run of clean stone at the outlet spreads the flow so it does not cut a channel into the soil.

Larger rounded stone works at the same outlets where the flow is stronger.

For the surfaces themselves, 5/8 minus is the standard top course on drives and parking pads. Below it, 1 1/4 minus carries the load and stays workable when the ground is soft and wet.

Both are minus products, so they compact and hold rather than drain.

Delivery to Mukilteo and the Surrounding Area

Washington Rock Supply delivers bulk material across Mukilteo and the rest of Snohomish County, including Everett, Marysville, Edmonds, Lynnwood and Lake Stevens. You order online, choose a quantity by the ton or by the yard, and pick a delivery date at checkout.

A dump truck tips the load in one pile on your site. Each product page has a calculator if you want to size the load before you order.

Ground and Conditions in Mukilteo

The wet season runs October through April across the Puget Sound lowland. During that window, exposed soil has to be stabilized within two days under the state stormwater manual for western Washington, against seven days in summer.

That timing shapes how a project here is scheduled. Base, paving and paver work is best planned for the dry months, and winter work needs the grade kept covered between stages.

The ground itself is glacial. A dense till cap sits over advance outwash sand, and the lower part of that till is hard enough that crews call it hardpan.

Water perches on the till instead of draining through it.

Winter rain perching where outwash sand meets clay below it is what puts bluffs in this part of the state on the landslide maps. The same perched water undercuts cut slopes and fill on a smaller scale.

Frost is not the problem here. Winters are mild and wet, so it is saturation rather than frost that softens a base, and a drive that was firm in August can rut in February.

Order Bulk Aggregate for Mukilteo

Washington Rock Supply delivers 5/8 minus, washed drain rock, sand and soil across Mukilteo and Snohomish County. Choose your material, set the quantity by the ton or by the yard, and pick a delivery date at checkout.

Order online when your site is ready.