Do I Need A Drain Pipe Behind Retaining Wall?

Do I need a drain pipe behind retaining wall? Every retaining wall should include drainage stone behind the wall. Though it is a good idea to install a drainage pipe on all walls, there are certain situations where a perforated drain pipe is absolutely necessary. These walls need a drainage system regardless of the wall height.

How do you drain water from a retaining wall?

Can I drill drainage holes in retaining wall?

There are several ways to prevent water from building up behind a retaining wall. Weep holes should be drilled through the wall. This can be done by placing one pipe near mid-height of the wall, and another pipe near the footing of the wall.

How much drainage do I need for a retaining wall?

In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Compacted native soil can be used to backfill the rest of the space behind the wall.

What is a weep drain?

Weeps, or weep holes are used to drain water through a wall. Weep tubes line weep holes to ensure that draining water does not damage the surrounding wall with erosion over time. Made in standard sizes with durable plastic materials, weep holes can also be plugged or screened with ease to regulate drainage.


Related faq for Do I Need A Drain Pipe Behind Retaining Wall?


Can you build a retaining wall in the rain?

In general, I do not recommend building masonry walls during rain. However, masonry can be installed in the rain if the walls are covered under a temporary shelter and the materials are protected from rainwater. If walls are completed just before a rainstorm, protecting the top of the wall is important.


How do you install a perforated drain pipe behind a retaining wall?


How big are Weepholes?

The most common ones are 1/4 or 3/8 inch in diameter by 3 1/2 to 4 inches long. Manufacturers recommend installing them at an angle in the mortar of the head joints, spaced 16 inches apart. COTTON WICKS Cotton wicks are used to form another type of weep system.


How many weep holes do I need?

Vents are required at 450mm intervals and each opening should have at least 2 weep holes.


How does retaining wall drainage work?

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.


Where should weep holes be provided?

Therefore, weep holes are at the bottom of brick veneer, just above the top of the foundation, and directly above the termination point of any flashing installed behind the brick. Weep holes also should be located above doors, above and below windows, and above any other openings in the brick wall.


What is surcharge in retaining wall?

Surcharge: The vertical load imposed on retained soil that may impose a lateral force in addition to lateral earth pressure of retained soil. For example: Sloping retained soil; structure footings supported by the retained soil; adjacent vehicle loads supported by retained soil.


What is the hole in the shower called?

These items are called sink overflows and are a common feature on baths and sinks. They are present to prevent the sink from overflowing with water should the plughole be blocked (by a plug for example).


How do you drill a weep hole in a retaining wall?

Wear safety glasses, hearing protection and a dust mask. Hold the tool firmly at a 90-degree angle to the surface of the wall. Drill the hole slowly to prevent cracking and pull the drill bit out carefully once the hollow center of the block or back of the retaining wall is reached.


Should I seal weep holes?

Weep holes should not be sealed to keep pests out.

Though homeowners naturally want to block pests, weep holes should not be sealed with caulk or mortar. The holes are still necessary to drain water and to ventilate the air space.


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