3/8 Clean for Patios in Centralia, WA

If you are planning a patio, a paver walkway or a shop slab, you need gravel and aggregate delivery in Centralia, WA, and the first thing to sort out is what goes under the flatwork. Washington Rock Supply sells bulk material by the ton, delivered across Lewis County.

The Washington default surfacing course is 5/8 minus, and it packs hard because the crusher fines stay in the mix. Around the Chehalis valley, where fine terrace soils hold water, that matters.

Ground and Conditions in Centralia

Across the Lower Columbia, Chehalis valley and the Willapa Hills, the ground runs to river terrace silt and gravel, with volcanic ash and reworked deposits on the slopes draining Mount St. Helens.

Valley flooding and slow-draining silt are the local drivers, and fine soils hold water instead of shedding it.

When a base is too thin, water sits in it and the pavers above start to move. Soft spots open at the edges and joints widen.

A free-draining course under the bedding is what keeps the surface flat.

Grading in the river valleys gets planned around the winter flood season as much as around the rain. The wet season rule runs October to April, with two days the limit on exposed unworked soil.

Winters here are mild and wet, with only shallow frost. Ground that softens in this part of the state softens because it is full of water, not because it has frozen and thawed.

County and city building departments set footing depths, and the state residential code sets the floor.

Materials for Centralia Projects

Bedding under pavers and flatwork is where the choice matters most. A setting bed has to compact, not drain, so a minus product is the right call.

Stone Screenings, which yards here call crusher dust or 3/8 minus, is the fine end of that range.

The structural course below goes in first. 1 1/4 Minus, also called CSBC, carries load and stays workable on soft wet ground because it has a larger top size and fewer fines.

Above it sits the surfacing course. 5/8 Minus, or CSTC, is crushed rock with the fines left in, so it packs hard and sheds water rather than soaking it up.

Where you want a washed, fines-free stone instead of a minus, go the other way. 3/8" Crushed Stone is 3/8 clean, used for paver joints and permeable setting beds.

3/4" Crushed Stone is 3/4 clean for trench backfill, pipe surround and under-slab drainage.

Two more earn their place on the same jobs. Walkway Gravel, or 1/4 minus, packs tight underfoot on paths and side yards.

Drain Rock, also called 7/8 clean, is washed with no fines, so it keeps its voids where water perches on till.

Delivery to Centralia and the Surrounding Area

You order online and choose a quantity by the ton or by the yard. Each product page has a calculator to help you size the load, and you pick a delivery date at checkout.

A dump truck then tips the material on site.

Washington Rock Supply delivers bulk material in Centralia and to the rest of Lewis County, including Chehalis, Winlock, Morton, Mossyrock and Vader. The truck leaves the load in one pile where it lands.

Order Bedding and Base Material for Your Centralia Project

Wrong bedding and a weak base are what turn a flat patio into a wavy one a season later. Work out your quantity with the calculator, order online by the ton or the yard, and pick your delivery date at checkout.

Washington Rock Supply will tip the load at your Centralia site.