Poor drainage rots decks.  Here’s the fix:

We will construct a drainage system along the entire rear side of your home.

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 grade of the soil under the house adjacent the trench 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 then backfilled with drain rock.  The rock we recommend 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.

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.

We will connect the new system to the existing system near the left rear corner.

We will remove and replace the existing deck boards as necessary.

After the soil beneath your home dries, a floor level survey can be performed, and additional recommendations can be made.

If the deck boards that are removed to install the drainage are damaged, we will install new deck boards and you will be charged for the cost of the new deck boards.

We will raise the rear deck to a more level position and replace the rotted deck boards.  We will trim the deck boards to provide clearance around the oak tree and install new deck boards to fill in the space around the oak tree.

No work on the railing or bench is included.

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