Gravel, Stone and Sand Delivery in Honolulu, HI

Cinder land at the mapped point

The USDA soil survey maps the center point of ZIP 96813 as Cinder land. Cinder is loose, porous volcanic rock, blown out in small, light, sharp-edged pieces. It is less a soil than a bed of rough stone, and water passes through it quickly.^[1]

Cinder ground can make a decent subgrade for a path or pad because it drains so freely, but it shifts when it is loose. Compacting it in place with a plate compactor before you add stone gives the new layer something firm to rest on. Where cinder mixes with weathered soil, the ground may be softer and need a fabric layer.^[1]

The ground at the mapped center point stands 730 feet above sea level. Many lots in the ZIP sit lower, on graded or filled ground near the shore, so check your own site with a shovel before you plan the base.^[2]

Cinder pieces are rough and sharp, which helps them lock together when packed. That same roughness makes bare cinder hard on knees and hands, so cover it with a softer stone or mulch where children play.^[1]

Old lava fields and cinder cones shape much of the ground on the island. Where your yard sits on that kind of material, expect stony, fast-draining soil that holds little water, and plan watering for new plants accordingly.^[1]

Rain at the Manoa gauge

Weather normals come from the NOAA station Manoa Lyon Arbo 785.2, HI, about 2 miles away. It records 151.0 inches of precipitation in an average year, far more than most gravel surfaces ever have to handle. Snowfall there is 0.0 inches, and the station sees no days a year with a low of 32 F or colder.^[3]

That much rain changes the order of the work. Frost heave is not a factor, so a base does not have to be built deep against freezing. Instead, every surface must shed or absorb water fast, and every slope must be armored against flowing water. Mud tracked from bare soil is the most common complaint, and stone cover is the fix.^[3]

Rain that heavy also keeps plants growing all year. Weeds push up through thin stone, so a fabric layer under decorative River Rock or Pea Gravel saves a lot of pulling.^[3]

Paths and parking that drain

For a parking pad or a short drive, build on a compacted layer of Road Base or Crushed Concrete and finish with #57 Crushed Stone or 3/4" Crushed Stone. Open stone lets rain drop through instead of running across the surface. Lay fabric under the base wherever the subgrade is soft or muddy.^[1],[3]

Garden paths do well with 3/8" Crushed Stone or Walkway Gravel, which drain at once and stay firm. Avoid fine-heavy surfaces such as Stone Dust Screenings on paths that see heavy rain, because the fines wash away. Edge every path so flowing water does not carry the stone into beds.^[3]

Where a pad meets the street, Asphalt Millings pack into a hard apron. In a downpour they hold together better than loose stone, which helps keep gravel off the sidewalk.^[3]

Condo and townhome lots often have only a narrow strip of ground beside a walk or a lanai. A shallow bed of 3/8" Crushed Stone or Pea Gravel over fabric turns that strip into a clean, low-care border that drains after every storm.^[4]

Shared driveways in multi-unit buildings take a lot of turning traffic. A compacted Road Base layer with a thin top of 3/4" Crushed Stone resists the scuffing that turning tires cause better than loose round stone.^[4]

Channels, swales and downspouts

Roof runoff in a heavy storm can be a small river. Set a splash pad of River Rock under each downspout and carry the water away in a shallow swale lined with 1-1/2" Crushed Gravel or River Rock. Wide, shallow channels slow the water better than narrow, deep ones.^[3]

Where water leaves the lot or drops down a bank, Riprap at the outlet keeps the flow from cutting into the ground. Underground, a French drain filled with Drain Rock and wrapped in fabric moves water from a soggy patch of lawn to a safe outlet. Clean, washed stone resists clogging longer in a wet climate.^[3]

Behind small retaining walls, backfill with Drain Rock or #57 Crushed Stone. Without that, the water held behind the wall after a long rain pushes it outward.^[3]

Check stone channels after the biggest storms of the year. Heavy flow can shift River Rock and leave bare soil exposed, and a few fresh pieces put back in place stop a small washout from growing into a gully.^[3]

Sand for pavers, pools and play

Many projects in ZIP 96813 are small: a paver landing by a door, a courtyard floor, a play area in a shared yard. Each one uses a different sand. Concrete Sand is coarse and drains well, which makes it the right bed under pavers in a wet climate. Mason Sand is finer and suits joint filling and mortar work.^[4]

Playground Sand is washed and screened, so it is clean and soft for a sandbox or under a swing. Fill Sand is the bulk choice for raising a low area or backfilling around pipe, where it drains far better than soil would. Cover any sand area that will see heavy rain with a firm edge so the sand stays in the box.^[3]

For a paver patio, compact a layer of Road Base, screed Concrete Sand over it and set the pavers with a gentle fall away from the building. Sweep Stone Dust Screenings into the joints. In rain this frequent, give the patio a clear fall before you add depth.^[3]

Homes, yards and mulch in ZIP 96813

The Census counts 14,019 housing units in ZIP 96813. Detached single-family houses are 19 percent of them, so most homes are apartments, condos and townhomes. The median home was built in 1986, and owners live in 54 percent of the occupied homes.^[4]

Small yards and courtyards suit stone more than lawn. A bed of River Rock or Pea Gravel needs no mowing and drains fast after a shower. Around plants, Brown Shredded Mulch, Black Shredded Mulch or Red Mulch keeps soil from splashing and holds moisture in drier weeks. Mulch breaks down quickly in warm, wet weather, so plan to refresh it more often than you would on the mainland.^[3],[4]

Hawaii's state road reference is Aggregate Base Course, Section 304, in the Standard Specifications for Road and Bridge Construction (2005) of the Hawaii Department of Transportation, Highways Division.^[5]

A strip of Black Shredded Mulch or Red Mulch along a walk gives color with little upkeep. Edge it so the next heavy shower does not float it onto the pavement.^[3]