The waterproof membrane for retaining walls needs to be chosen correctly. By placing a waterproofing membrane behind the retaining wall at the time of construction, will help to keep ground water away from the wall. They come as paints, are quick to apply to a wall and have excellent flexibility to allow for soil movement within the wall without cracking and letting water through. It is put in to protect the waterproofing membrane painted on the backfill side of the wall from the gravel, rocks and rubble back fill piercing the coating. One type of sleeper wall is a short, load bearing wall used to support a structure so as to keep the beams or joists that form the base for its floor off the ground. Just wondering if there is a need for builder plastic behind the wall? Drainage ag-pipe, non woven geotextile fabric, waterproof plastic membrane and gravel shall be installed to the rear of the retaining wall. Correct. Rising damp, and some penetrating damp, can be caused by faults to, or the absence of a damp-proof course (DPC) or damp-proof membrane (DPM). STEP 7: Preparing for backfilling. The sleepers will need to be pinned through the height to keep them stable (lots of different ways to do that). 1 Dig a 6- to 8-inch wide trench immediately behind the retaining wall with a shovel. From codes and regulations to retaining wall material options, there is a solution for every slope on your property Example, if your wall is 800mm high, then no compaction within Thermo. I built a 1 metre retaining wall from softwood sleepers, the ground was cut back behind the wall with a weed membrane type fabric against the soil/chalk, and then the gap filled with gravel. That or lie them on a damp proof / course membrane, or back the whole pile of sleepers with a membrane before you back fill. Attach a plastic membrane (see photo above - optional with raised bed) Fill with soil. A very common problem is the failure to provide adequate protection for a newly installed and perfectly good membrane. Or French drain it with gravel behind it, then put soil in after. Retaining Wall Membrane Protection . Discussion in 'In the Garden' started by Douglas2, 17 Jul 2009. The pipe should be covered with around 200mm of gravel in order to provide sufficient drainage. Waterproof Membrane for Retaining Walls. 1m high wall with 200 x 75 x 1800mm timber sleepers. Once the sleepers have been slotted, a plastic membrane will need to be placed behind the retaining wall along with a pipe placed along the bottom of the plastic membrane. Thanks Douglas2, 17 Jul 2009 #1. Choose a good Liquid Rubber Membrane. Joined: 17 Jul 2009 Messages: 23 Thanks Received: 0 ... Do I need to consider some sort of dampproof membrane behind the wall? Usage rating of over 40 years put the XFasten Fiberglass Waterproofing Anti-Fracture Membrane Fabric Tape on our list of the best waterproofing membrane for shower. Cover drain and backfill with 20mm scoria up the height of the wall. Starting from the top of one of the walls, align the edge of the membrane against the ceiling and the edge of the adjoining wall. A damp-proof course is a barrier, usually formed by a membrane built into the walls of a property, typically 150 mm above ground level, to prevent damp rising through the walls. Example, if your wall is 800mm high, then no compaction within 600mm of back edge of wall. The sleepers themselves should be built up with staggered joints. The design of a properly-built retaining wall resists the force of the soil behind it and prevents caving, buckling, or leaning. Clean stone behind the sleepers, then membrane and then soil. They are also considerably cheaper than standard block retaining walls. 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