Order 2A Modified and Crushed Stone in Armstrong County, PA
Heavy rain and snowmelt run down steep hillsides here, and water soaking into clay layers on slopes is the main trigger for ground movement. That makes drainage the first decision on any Armstrong County job. Pennsylvania Rock Supply delivers gravel, stone and aggregate in Armstrong County, PA, and 2A modified is the base most local buyers start with.
Armstrong County sits in Southwestern Pennsylvania, on ground cut by steep valleys and underlain by shale, siltstone, sandstone, claystone and coal beds. Many communities sit over old underground coal mines, so where roof and drive runoff goes matters on hillside lots.
Materials Delivered in Armstrong County
Order by size. Coarse stone drains and armors. Fine stone beds and packs. The list below runs from the biggest clean rock down to the finest material.
2A modified, the Pennsylvania base stone
2A modified is crushed stone with the fines left in, so it compacts hard. Local buyers also call it modified stone. It is the standard base for driveways, parking pads, shed and patio bases.
2A modified is the trade name for a 2A-type base with extra fines added.
Some buyers ask for Crusher Run for the same compacting base job. Most Pennsylvania yards point them to 2A modified instead. For a surfacing layer over a compacted base, use Driveway Gravel.
Fine bedding comes next. Mason Sand handles brick and block mortar and paver joints. Washed Sand goes under slabs and pavers. For lawns and bed prep, order Top Soil.
Ground Conditions Across Armstrong County
Work runs from spring, once the ground has thawed and dried, into late fall. Time a delivery to that window. Long wet spells and rain on snow are when hillside ground is most likely to move.
Clay-rich soils that stay wet soften and heave through repeated freeze-thaw cycles. A thin or poorly drained base breaks up. Frost depth is commonly about 36 inches, set by each municipality, and it is a footing depth rather than a base rule.
Slides and slumping on steep slopes with clay-rich soils are the local erosion driver, along with stream bank scour and ditch washouts after heavy rain. Armor banks with rip rap and send roof and drive runoff somewhere designed for it.
On slopes, use clean stone such as 2B behind walls and in French drains so water keeps moving. On flatter pads, 2A modified compacts into a firm base that sheds surface water.
Delivery Across Armstrong County
Order online and size the load by the ton or yard. The calculator takes your measurements and returns a quantity. Pick a delivery date at checkout, and a dump truck brings the material to your site.
Coverage runs across the county, including Kittanning, Ford City, Leechburg, Freeport, Apollo, Rural Valley, Parker, Dayton, Worthington, Ford Cliff, Templeton, Adrian, Cowansville and Seminole.
Spread a load where the truck can reach. If your driveway is soft or steep, have the driver drop on firm ground and move material from there.
Choosing the Right Material
Armstrong County sits in the Western Pennsylvania plateau hills, where clay-rich soils and steep valleys set the base and drainage choices. Neighbouring counties show how that shifts.
Jefferson County to the north is in North Central Pennsylvania and covers both the Western Pennsylvania plateau hills and the North-central high plateau and Allegheny Mountains. Ground is similar where the zones overlap and higher where they do not, so expect the same 2A modified base with more attention to drainage on the plateau ground.
Clarion County to the northeast covers the same two zones. Ground is similar to Armstrong, so the difference is the project: drives and pads take the same base, and steeper ground takes more clean stone.
Westmoreland County to the south is in Southwestern Pennsylvania and also spans both zones. Ground is similar here too. Where lots sit flatter, base depth matters less than getting water away from the pad.
Order 2A Modified, Clean Stone and Fill in Armstrong County
Pennsylvania Rock Supply delivers 2A modified, clean stone, sand, soil and fill across Armstrong County, from Kittanning and Ford City to Leechburg, Freeport, Apollo and the smaller communities in between. Order online, size the load with the calculator, and choose your delivery date at checkout.