DIY under cover Drainage systems

The floorboards of a deck have some space between them, which allow some water to escape the surface and provides some space for seasonal expansion. Without any type of plate fishing, however, inevitably, some water remains on the surface of the deck after precipitation. Without any system for direct runoff water, moisture can flow to the foundation of the house. In conjunction with the slanted roof panels, the application of a drainage system undercover protects your deck and base. An undercover drainage system directs water away from under the deck and away from the foundation of the house.

A drainage system around the perimeter of a house protects the base from leaks, mold and other major water damage. Underground drains capture and distribute groundwater away from the foundation walls for a safe exit. Whereby a drainage system around a house is an important project that involves significant work to dig deep trenches. The size of your home in addition to your skills and speed will determine how long it takes to complete.


  1. Place the course of the Under Deck Oasis system with a long rope that runs around the house about 3 feet from the foundation, and extends to a ditch or dry place, away from the house. Place a plastic tarp on the side of the rope.
  2. Dig a wide 10-inch ditch with a shovel and hoe opening trenches. Dump the earth and grass on the tarp and continue digging until the bottom of the ditch is one foot beyond the foundation of the house. Start at the end of the ditch furthest from the socket, and dig down the bottom 1 inch deeper with every 8 feet in length to make a smooth and consistent descent.
  3. Place the water filtration cloth on the bottom of the trench and pour a 6-inch layer of gravel on top. The tissue will keep the mud clogging the gravel allowing moisture to travel through.
  4. Set a length of 4 inches of PVC perforated drainage pipes in the trench. Connect each joint with the tea, elbow or star-accessories, depending on whether the joints are curved or straight.
  5. Fill the extension above the tubes with gravel to reach approximately 6 inches from the surface. Place a layer of water filtration cloth on it.
  6. Use some of the removed soil to dig the trench to fill in the remaining extension, and re-plant the grass on top. Transfer the rest of the ground with a wheelbarrow to raise the lower areas of the yard.

 Provide enough clearance to create a 3-inch deep channel between the beams, then place the membrane to the next beam with staples in the same way as in Step 1. Use this method through the part lower deck, one after the next joist. If the vinyl siding does not provide sufficient length to create depressions through the bottom of the deck, use more than one siding, overlapping them on the beam in which they are located.