Do I Need A Drain Pipe Behind Retaining Wall. We just had the wall built by friends, who insist that we do not need a drain behind the wall, he left a 11/2 ft margin from the wall to the hillside so the water will drain that way.he says, but. 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 rodent screens can be used to allow the water to flow through the outlet pipes and keep the pathway clear of debris.
Learning how to build a retaining wall can be fun with these helpful tips.
Build a strong, stylish retaining wall without mortar. This video shows you how to properly install a drainpipe behind your wall for. And third, is to ask if weep holes will be needed to allow water to drain through the wall. The water behind the wall seeps out through the block joints, so i had no need for a drain pipe behind the wall.