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.
Concrete drainage swale behind retaining walls.
Clay when wet is very weak so it essential to provide a way for water to escape from behind the wall.
These walls need a drainage system regardless of the wall height.
An earth retaining structure which offers true plantability uninhibited root and water penetration while finished off with a fluted face.
If there are poor draining soils such as clay behind the wall there needs to be drainage incorporated the wall system.
When people think of retaining walls they tend to think about all the solid materials that go into making the job from how strong and thick the steel beams are to the strength and beautiful design of the concrete sleepers the drainage is an afterthought and is like really drainage is it even necessary or is it just one of those overdone.
The toe drain and the wall rock is designed to remove incidental water from behind the wall and is not meant as primary drainage path for above or below grade water management.
This loose rock is probably more than other companies would use but we would rather allow more water to flow behind the wall and out than not have enough.
We go about 6 8 deep behind the wall with loose rock usually crushed granite and up to the second row from the top.
One of the biggest causes of retaining wall failure is poor inadequate and clogged drainage systems.
Behind my house i have erosion 4 feet from the foundation in one area about 16 feet long.
Backfill simply refers to the soil directly behind the wall.
Use fabric behind the wall.
Is drainage behind a retaining wall important.
In all cases wall rock is located within the cores of the block and a minimum of 12 in.
All poured concrete or cinder block retaining walls.
The interlocking method of construction makes this block ideal for any retaining application.
300 mm behind the block.
Usually constructed from pavers concrete blocks or other solid stackable materials retaining walls create a barrier against which soil rests turning a sloped yard.
Top of the hill i raised the soil near the foundation by 12 inches sloped away from the house at about 10 degrees with a small trench top of hill.
Fabric keeps rock and soil separate.
For proper drainage the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel.
The sock prevents clay and other fine particles from entering the pipe work which ultimately leads to pipe blockage.
Historically builders have applied hot tar reinforced by mesh behind concrete or masonry walls to seal the cement.
These walls do not have natural joints for water to drain through like segmental blocks and wood walls do.
In addition to ease the drainage of the ground water they placed gravel also referred to as drain rock across the up hill side of the wall.