Screenings for Patios in Allison Park, PA

If you are building a patio, gravel and aggregate delivery in Allison Park, PA starts with what goes under the pavers, not what you see on top. Pennsylvania Rock Supply sells the bedding layer and the base that holds it, plus 2A modified for everything that has to compact hard.

On hilly ground cut by steep valleys, water moves fast, and a patio base that does not drain or compact will show it within a season. The right bedding material is what keeps the surface flat.

Ground and Conditions in Allison Park

Western Pennsylvania plateau hills mean silty, clay-rich soils over flat-lying shale and sandstone. Clay that stays wet softens, and repeated freeze-thaw cycles every winter heave it. A thin base over that ground breaks up at the edges and dips in the middle.

Frost depth here is commonly about 36 inches, set by each municipality, so patios and flatwork need a base built for movement, not just a skim of stone. The fix is a compacted base with a bedding layer that drains.

Heavy rain and snowmelt run down steep hillsides, and where roof and drive runoff is sent matters on hillside lots. Slope failures and ditch washouts after heavy rain are common around the Pittsburgh region. Base, driveway and paver work runs from spring, once the ground has thawed and dried, into late fall.

Materials for Allison Park Projects

Patio and flatwork bedding is the job that decides how the surface performs. Screenings, also called stone dust or #10 screenings, are fine crushed stone under a quarter inch that packs firm under pavers and flagstone. That firm, tight bed is what stops pavers from rocking.

Below the bedding, 2A modified is the standard Pennsylvania base stone, crushed stone with the fines left in so it compacts hard. Local buyers ask for it by that name for patio and shed bases, parking pads and driveways.

Drainage behind a wall or under a patio calls for clean stone. 2B stone is washed, with no fines, so water moves through it and it does not pack hard. #57 stone is the same size, and #67 stone is a slightly smaller clean option for tight spots. 1B stone is the small clean chip used for walkway topping and decorative finishes.

For the finish around the patio, river rock and large river rock work for borders, decorative beds and dry creek beds. Natural Pea Gravel, sold as pea stone, stays loose underfoot for walkways and play areas. Mason sand mixes brick and block mortar, washed sand beds slabs and pavers, and topsoil or garden soil handles the final grading.

Delivery to Allison Park and the Surrounding Area

Order online and pick your quantity by the ton or by the yard, whichever your numbers are in. The calculator sizes the load for you, so you are not guessing at the counter or shorting the job halfway through spreading.

A dump truck delivers bulk material straight to the site, and you choose the delivery date at checkout. Pennsylvania Rock Supply delivers across Allegheny County, including Pittsburgh, Bethel Park, Monroeville, West Mifflin and McKeesport. Have the drop spot cleared so the driver can place the pile where you need it.

Get Your Patio Material Ordered

Figure your square footage and depth, run it through the calculator, and order the screenings, 2A modified and clean stone your patio needs. Pennsylvania Rock Supply delivers bulk aggregate across Allison Park and Allegheny County, so you can get the base and bedding on site and start building.