How do you put drainage behind a retaining wall?
For proper drainage, the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel. This is so that when water gets into the space, it does not become bogged down in soil but instead can flow down the wall to the drains or weep holes.
Should a retaining wall have drainage?
Every retaining wall should include drainage stone behind the wall. If there are poor draining soils such as clay behind the wall, there needs to be drainage incorporated the wall system. Clay when wet is very weak, so it is essential to provide a way for water to escape from behind the wall.
What is a drainage board?
Drainage boards allow water that has reached the walls of a structure to flow harmlessly away. Without drainage boards, water can saturate a building’s walls or pool around its foundation. The board is formed from an impermeable polymeric sheet, which is heated to form a dimpled drainage core.
What is drainage board made of?
Made from high-density extruded polyethylene, the product has a series of dimples molded into the plastic that create an air gap between the membrane and the foundation.
How does a drainage board work?
Drainage boards have a fabric on the dimple side which drains the water from the soil. By draining away the water, the hydrostatic loads on the membrane and foundation are lessened considerably.
How do you use a drain board?
Drainboard sinks keep your countertop clean and dry because they contain the water and channel it straight into the sink and down the drain. The drainboards can even be used for collecting food scraps. As long as the adjoining basin has a garbage disposal you can push the scraps straight into the basin.
Do you need a drainage system for a retaining wall?
These walls do not have natural joints for water to drain through like segmental blocks and wood walls do. These walls need a drainage system regardless of the wall height. If there are poor draining soils such as clay behind the wall, there needs to be drainage incorporated the wall system.
What kind of drain board does poly wall use?
Poly Wall® Arroyo™ Drain Board is a sheet molded drain that establishes predetermined pathways for below-grade water management. The fabric allows water to pass into the drain core while restricting the movement of soil particles which might clog the core.
How does water get out of a retaining wall?
Pipe Drains Pipe drains, also known as toe drains, are perforated pipes that collect water along the length of the wall and drain it to the outside. Some of these drains are vented through the front of the retaining wall, while others may run the length of the wall and drain out to the sides.
Where to place drain board behind Dimple wall?
A self-adhering water barrier is required for behind the dimple drain board to protect the wall from water intrusion. For optimal results, an SWD series strip drain should installed at the base of the wall to channel captured water away from the foundation wall.