Ward Construction provides services in the greater San Francisco Bay Area specifically, Alameda, Contra Costa, Marin and Solano Counties.  Our coverage includes Oakland, Berkeley, Richmond, Walnut Creek, Lafayette, Orinda, Moraga, Hayward, Marin and other East Bay and North Bay cities.

Here’s an example of the type of services provided:

We will construct a drainage system around your entire home. The system will be comprised of 3 separate legs all connecting along the front of your home. The first leg will start at the right rear corner and will extend along the rear of your home. We will construct a Keystone retaining wall beneath the left rear deck where there is currently unsupported bank and extend the drain behind it. The keystone wall will be approximately 13 feet long and 6 feet high. No engineering or permits are included with this wall.

The drainage system consists of two pipes in a rock filled trench.  One is perforated, to collect sub-surface water and the other is non-perforated, to collect water from the roof downspouts.  At the upper end or start of both lines, as well as at the major corners, a clean-out will be provided so that both lines can be tested or cleaned as necessary.

The minimum depth for the perforated pipe will be below the level of the basement slab and both the perforated and non-perforated pipe will fall at least 1/8 inch per foot for the total length of the system to the point of discharge.

The perforated pipe will be installed on top of a bed of gravel, two inches deep, with the perforations pointed down.  The trench will then be backfilled with drain rock.  The rock is Class I, Permeable Type A drain rock per the California State Specifications.  The drain rock is clean gravel that varies in size from 1/4 to 1/2 inch.  This size rock works best for our type of soil in that it allows the maximum amount of water to penetrate quickly and is small enough to keep out most of the surrounding soil.

The trench will be a minimum of 12 inches wide.  This permits a four inch blanket of rock on each side of the four inch perforated pipe.  If the trench that holds the drain is not wide enough, the drain rock will soon become impregnated with dirt from the sides of the trench and will not allow the water to reach the drain pipe.

We will seal the rear foundation with 2 coats of asphalt emulsion. We will remove and not replace approximately 24 square feet of concrete walk along the rear.
The system will discharge through a 4 inch solid pipe along the left side of your home to the front. We will connect the downspouts along the left side into this pipe.

The second leg of the system will also start at the right rear corner and will extend 52 feet long along the right side of your home.
The depth of the system will be below the adjacent slab floor. We will seal the foundation wall adjacent the living area.

We will install a 6 inch solid pipe along the front of your carport and home up to the edge of the ravine. The system will start at the right front corner of your carport with a  24 inch catch basin. Into this drain we will connect the right, rear, and left side drains, and 2 additional 12 inch catch basins located in the low areas at the front of your home. From the edge of the ravine the rigid pipe will connect to a 6 inch flex pipe which will run on the surface approximately 100 feet down the ravine.

Related Posts: