Retaining walls are very similar to planters but without the bases. They may be critical such as when the other side is a habitable room, or relatively non-critical such as a garden wall to stop the paint cracking off. Here the membrane is on the outside of the wall rather than on the inside but the same principles generally apply as for planters.
New Retaining Walls Construction
A core filled block work wall is normally open at the top when waterproofing is required. The first thing to do is to cement flush where the core fill has shrunk and waterproof on top with virtually any membrane to hand as this helps to reduce the porous block from becoming saturated every time it rains.
Liquid applied membranes will only work if the mortar is properly struck and flush. Vertical grade pure urethane such as Multithane HV or bitumen Urethanes such as Tremproof 60 have the best properties but water based SBR latex, latex bitumen and acrylic/cements are very popular. However torch applied SBS sheet membrane is safest and very long lasting and has the advantage with expansion joints, and also where the face of the block work wall is flush with the face of the footing as all that is required is an extra strip over the cold joint.
Membrane can be protected by: Cuspated protection board, XPS Polystryene board, Corflute board and Geotextile drainage sheet.
Where drainage sheet is used, terminate it at the top with a flashing profile to help hold in place and to keep water from travelling between the dimples and the membrane. Wrimco supplies 8mm and 10mm dimpled drainage sheets with integral filter, the 10mm has a higher flow rate and volume.
Repair leaking retaining walls
Assuming it is impractical to excavate the dirt and start all over again, or there was insufficient room to apply the membrane externally, then the wall has to be made watertight from the inside. If block work is used and the wall is saturated, then you just have to wait for it to become reasonably dry for the crystalline type coatings and special cements to bond and seal the surface; and similarly with the acrylic cements which will also handle a degree of movement or cracking in the substrate. Water based epoxies also find application here either on their own or as a primer for the acrylic cement.
Unfortunately none of the normal membranes such as SBS, APP, PVC sheet membranes or any of the liquid applied membranes or urethane sealants remain adhered to a wall that is permanently damp unless first primed with Epoxy.
Waterproof Water Storage Tanks:
Recycling water often require large concrete or reinforced block work structures. They are essentially planters with water instead of dirt and hence no need for protection boards, drainage cells, etc. Since they are often buried in the ground, the outside wall must be considered as a retaining wall.
New Water Storage Tanks
Wrimco SBS sheet membrane is by far the most cost effective and long lasting membrane system to use but the substrate must be dry. In some cases the builder needs to pour the slab against an excavated wall of dirt or rock, thus making it impossible to waterproof successfully as the base of the wall is permanently wet from ground water seepage.
Repair leaking water tanks
Pump out the water and check carefully all joints and seams by pressing and seeing if water comes out. If all OK, then cut some "peep holes" to check whether water has got under the membrane. You might have to torch another layer and then hold it down with say 60 mm of cement if water coming up through cracks in the slab is likely to be the problem.
Crystoflex is a Class 11 flexibility, two part waterproofing membrane comprising of a liquid component of selected polymers and a powder component of selected cements, fillers and aggregates. When mixed together to form a brushable or rollable slurry, it provides a strong, hydrostatic pressure resistant, flexible waterproofing membrane. Crystoflex was formulated for immersed or ponding situations such as the waterproofing of water tanks and water features but is just as suitable for non-immersed applications such as roofs or under-tile waterproofing. Crystoflex complies with: AS/NZS 4020:2002 Testing of Products For Use In Contact With Drinking Water - Australian Water Quality Centre Report Number 4007/92.1595. AS4858 Class 11. Meets the 'Green Star' environmental criteria. In ponds and water features where an aesthetic appearance is required, Crystoflex can be top coated with Primeseal MC which is compatible and enhances the performance of the entire waterproofing system. Crystoflex is suitable for many waterproofing applications, but is particularly useful for areas requiring hydrostatic pressure resistance and immersed applications including: Water retaining structures such as concrete tanks, ponds, pools, fountains and water features. Crystoflex is suitable for contact with drinking water. Wet areas - Class 11 membrane. Balconies and Terraces - Class 11 membrane. Retaining walls, planter boxes. Roofs (top coated with Azcoflex or Azcothane as recommended). Under tile waterproofing on balconies, terraces, podiums and decks. Suitable Surfaces: Crystoflex is suitable for use on the following correctly prepared and primed surfaces: Concrete, cement, cement render, polymer render, block work (preferably filled and vibrated to ensure the absence of voids), brick, FC and CFC sheeting, blue board, timber, masonry and metal after application of a suitable metal primer
Multithane HV is a tough, durable, elastomeric, single pack, liquid applied, moisture curing, cross-linking, polyurethane waterproofing membrane - usually grey in colour. Multithane HV forms a tough, flexible, seamless waterproofing membrane designed for both vertical and horizontal surfaces that bonds well to most suitably primed building substrates. Multithane HV is formulated as an anti-sag membrane, that although easy to apply by roller or brush, it can be applied on to vertical surfaces without slumping to achieve the require film thicknesses. Uses: Multithane HV is designed to waterproof most applications within the building and construction industry including: Tiled or covered areas. Shower recess & wet areas (floors and upturns). Decks, balconies, terraces & podiums. Retaining walls. Planters and landscaped areas. Structural slabs. Tanks, pits and water retaining structures. Roofs (covered by pebbles or top coated with Multithane ATC). Suitable Surfaces: Multithane HV is suitable for most building substrates including: Concrete, Cement and cement block work, FC Sheeting, Hebel, Render, Brick, Plaster Board, Masonry, Bitumen (if primed with Primeseal). Surfaces should be sound, stable, dry, clean and free of dirt, dust and contaminants and suitably primed w
Highly flexible - over 900% elongation. No seams or laps. Generally no priming required. Single layer application possible. Ready for immediate use (no mixing required). Accommodates crack movement from 0 to 1.6mm when fully cured at 1.3mm thickness. Withstands hydrostatic pressure of up to 4m head of water while bridging a crack of 1.5mm width. Over 15 years proven performance. Available in self-levelling (H) grade or rollable grade (R) for easy application. TREMproof 60 is a single component, bitumen modified, moisture curing polyurethane fluid applied waterproofing membrane. Usage/Purpose: Roofs, Tunnels. Terraces, Balconies, Plaza Decks, Planter Boxes, Retaining Walls, Fountains and Pools. Concrete surfaces shall be cured for a minimum of 28 days. Surface should have light steel trowel finish followed by a fine hair broom or equivalent finish. Substrate should be free from dust, oil, curing agent resi- dues and other contaminants. All shrinkage and non moving structural cracks under 1.5mm shall be filled with not less than 1.5mm (1500 wet microns) of TREMproof 60R extending 75mm to both sides of the crack. Cracks wider that 1.5mm should be routed to 6mm width and 13mm depth. Install a closed cell polyethylene backing rod and seal with TREMproof 60R extended to 75mm either side of the joint. Wherever a vertical penetration exists (eg parapet walls, columns, stacks etc.) install a 25mm fillet of TREMproof 60R at the point where the vertical and horizontal surfaces intersect. The TREMproof 60 membrane should then be applied over the fillet to a height of approximately 75mm to form an overflashing. Voids and honeycomb must be patched with a non-shrinking, quick setting grout. Allow the patched area a minimum of 7 days to cure.
Duram 195 is a single pack, liquid applied, moisture curing, self leveling, waterproofing membrane which cures to form a seamless, tough, durable, elastomeric (class 3 ) waterproofing membrane. Duram 195 incorporates UV stabilisers, UV absorbers and anti-oxidants to enable the product to provide greater UV protection and stability than conventional aromatic polyurethane membranes. Duram 195 bonds well to most suitably primed building substrates and is suitable for above and below ground applications. Duram 195 is black in colour but will not bleed or stain tiles or grout as the product is tar and bitumen free. Duram 195 meets the 'Green Star' environment criteria. Duram 195 is designed to waterproof most applications within the building and construction industry including: Exposed Areas: Roofs, decks, terraces, balconies, podiums and gutters. Tiled or Covered Areas: Shower recess & wet areas (floors and upturns), decks, balconies, terraces, podiums, retaining walls, planters & landscaped areas, structural slabs, tanks, pits, bunding areas and water features. Duram 195 is suitable for most building substrates including: Concrete, Cement, Cement Render, FC and CFC Sheeting, Render, Brick, Block work, Plaster Board, Masonry, Bitumen (when primed with Primeseal MC), Metal, Timber, Particle Board and Plywood ( when primed with Primeseal MC). Surfaces must be made good and should be sound, stable, dry, clean and free of dirt, dust and contaminants and suitably primed.
Crystoseal is a ready-for-use
(merely add water) concentrated, high strength, cement-based
waterproofing slurry incorporating active chemical constituents which,
when applied, become active in cementitious substrates and by
a crystallization process provides a waterproof seal within the
substrate. Crystoseal waterproofs sound concrete or cement surfaces
against water ingress, dampness, ground water and hydrostatic pressure.
Crystoseal is suitable for waterproofing both the positive and negative
sides of the substrate. It consists of a blend of cements, graded quartz
and active chemical constituents and gives a render-like appearance.
Crystoseal works by the conversion of free lime in the concrete to
insoluble calcium compounds. These seal against capillary ingress of
water. Compounds within Crystoseal penetrate in to the substrate where
they in turn 'crystallise' on contact with moisture and create a
waterproof barrier. Uses: Crystoseal is an economical, easily applied
method of providing a waterproof barrier to sound and stable concrete or
cement based products such a cement filled block work. It may be used
on both new and existing structures. Crystoseal finds particular use on
concrete structures where access is only available to negative side of
the structure such as the internal side of retaining walls. Suitable
Surfaces: Crystoseal finds applications in concrete or cementitious
substrates such as: Foundations, basements, tunnels, retaining walls,
water retaining structures, ponds, pools, silos and underground
Primeseal MC (Moisture Cure)
is a water based, epoxy waterproof membrane. It is a high performance, versatile, two-part, water based, hydrostatic pressure resistant, waterproofing barrier membrane coating suitable for most types of porous and semi-porous surfaces including green (newly laid) hardened concrete and damp surfaces. It cures to form a strong, waterproof, hydrostatic pressure resistant and water vapour pressure barrier and is formulated for application on to damp, newly laid concrete and most other construction surfaces. It is suitable for potable (drinking water) applications and can withstand up to 25 metre head of water pressure. It's versatility makes it also ideal as a primer for waterproofing membranes, paints, industrial coatings and as a bridging coating for normally incompatible coatings.
It's standard colour is light grey but is also available in off-white and black (minimum quantities apply). It has very low VOCs and meets the 'Green Star' environmental criteria. Uses: It is formulated for demanding waterproofing, sealing and priming applications including: Waterproofs and seals damp and green (newly laid) hardened concrete. Waterproofs negative (inside) surfaces. Waterproofs positive (outside) surfaces. Waterproofs above and below grade surfaces. Low water vapour pressure barrier. (Prevents or minimises bubbling of membranes due to vapour emissions from the substrate). Waterproofs basements, retaining walls, lift wells, cellars etc. Waterproofs tanks and water retaining structures, i.e. concrete or cementitious structures. Excellent primer for subsequent Wrimco membranes, paints and industrial coatings. Seals and primes timber floors prior to applying waterproofing membranes and other coatings. Seals concrete floors before laying timber floors