Paver patios, retaining walls and outdoor living spaces

What proper base preparation looks like

For a residential patio on stable soil we excavate to a minimum of six inches below finished grade, install a woven geotextile separation fabric, then place and compact Class II aggregate base in two-to-three inch lifts with a plate compactor, not all at once, because a single thick lift only compacts at the top.

On expansive clay, which covers a lot of inland Vista, base depth goes to eight or ten inches and the fabric is not optional. For driveways and anywhere a vehicle turns, we go to ten to twelve inches. Then one inch of bedding sand screeded flat, pavers laid, edge restraint mechanically fastened, and polymeric sand swept and set.

This is why two paver bids can differ by forty percent for the same square footage and the same stone. Ask any contractor for their base depth and their compaction method in writing. If they will not put it on the proposal, that tells you something.

Materials that survive North County sun

Our UV load is high and our winters are mild, which changes the calculus compared to most of the country.

• Concrete pavers: the workhorse. Individually replaceable, no cracking, colour goes through the unit on better lines so chips are not obvious. Best value for large areas.
• Natural stone: flagstone, travertine and bluestone. Beautiful, cooler underfoot in travertine's case, more expensive to install because every piece is fitted.
• Poured concrete: fine for driveways and utility areas. It will crack; the question is whether the control joints put the crack where you chose. We do not recommend stamped concrete for large patios here because colour hardener fades unevenly in full sun.
• Segmental retaining wall block: for anything structural. Cores filled, geogrid where the engineering calls for it, and a drainage chimney behind the wall with an outlet.

Retaining walls and hillside lots

A large share of Vista, Bonsall and Fallbrook properties sit on a cut or fill slope. That makes retaining a structural question. A wall is holding a wedge of saturated soil that gets dramatically heavier in a wet February, and the walls that fail are almost always the ones with no drainage behind them.

Every structural wall we build gets clean drain rock against the back face, filter fabric to keep fines out of it, and a perforated pipe daylighted to somewhere that is not your neighbour's yard. Over three feet, or with any surcharge above (a driveway, a pool, a slope), it gets engineered drawings and a permit. That adds three to five weeks for plan check and inspection, and it is not a step to skip. An unpermitted wall becomes your problem at resale.

Outdoor kitchens, fire features and shade

The three things that actually get a backyard used here are shade, a heat source for the evening and somewhere to put a drink down. In our climate that is a better investment than almost anything else you can build.

Outdoor kitchens are framed in steel stud rather than wood, backed with cement board and finished in stone, stucco or tile. Gas, water and a dedicated GFCI circuit get roughed in before the veneer goes on. For fire features, gas is the practical choice. The San Diego air district restricts wood burning on some winter days, and a gas fire pit gets used far more often because it turns on.

For shade, a solid-roof patio cover changes a west-facing yard more than any other single element. It also requires a building permit and a footing inspection, which we handle.

Drainage is part of hardscape, not a separate trade

Any time you add impervious surface you change where the water goes. A 600 square foot patio sheds roughly 375 gallons in a one-inch rain event, and that water has to have somewhere to go that is not the foundation.

We set patios at a minimum two percent fall away from the structure, tie in channel drains where a slope runs toward the house, and connect downspouts into a solid pipe system that daylights at the property line or into a dry well. It gets designed with the patio, not diagnosed after the first storm.