Use a compacted aggregate base sized to the expected load and soil conditions to ensure long term support and drainage for patios and driveways.

For patios install a compacted aggregate base of four to six inches and for driveways plan on six to twelve inches based on soil strength and expected vehicle traffic. Start by removing organic topsoil to the required depth and check for soft spots by probing; if the subgrade deforms more than a half inch under hand pressure, excavate deeper and replace with compacted aggregate. Place crushed stone in lifts no thicker than three inches and compact each lift with a plate compactor until there is no visible movement and the surface is firm to the touch. Slope the base at a quarter inch per foot away from the house for drainage and add a layer of coarse aggregate or a permeable bedding to prevent capillary rise of water. Where soils are clayey or saturated, lay a nonwoven geotextile fabric to separate the subgrade from the aggregate and reduce pumping of fines; cut overlaps by six inches and secure them to prevent shifting during placement. Always finish with a final rolling pass and recheck elevations before placing pavers or asphalt to ensure uniform bearing and predictable settlement.

Common mistakes include using uncrushed rounded gravel which compacts poorly and leads to settlement and rutting, so choose angular crushed stone and compact it in lifts to achieve interlock. Another issue is underestimating base depth for heavy loads or poor soils which causes premature failure; address this by testing the subgrade firmness and increasing depth toward twelve inches for driveways on weak soils. Finally many neglect drainage and allow water to collect under the hardscape which weakens the base; prevent that by installing a consistent surface slope, edge drains where needed, and by using geotextile and coarse drainage layers to move water away quickly.

BigHomeProjects.com connects homeowners with local contractors and community advice to plan correct aggregate base depths for patios and driveways. We host a discussion community where homeowners and contractors share experiences, tips, and photos so we can all learn what works for different soils and loads.

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