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How to Waterproof a Retaining wall with liquid membrane:    

 

Priming and Preparation


Good preparation is essential. Surfaces must be sound, stable, dry, clean and free of dust, loose, flaking, friable material, and substances that may diminish adhesion.

On porous surfaces, the recommended primer is Primeseal MC, although in some applications where the moisture content of the surface is very low, Multiseal may be used.


If there is any risk of entrapped moisture in the surface, which can cause the membrane to bubble, then Primeseal MC must be used. Primeseal MC may be applied to slightly damp surfaces but freedom from surface water and continual dampness is essential as the product will not dry if the surface remains damp. 
Apply Primeseal MC at the minimum rate of 4 sq.m. per litre so that the area has a uniform and complete coverage. Allow to fully cure before applying the Multithane HV liquid membrane.
Apply Multiseal at the rate of 4 sq. m. per litre, allow to cure and apply 
Multithane HV  within 48 hours. Ideally, surface should be primed on one day and the membrane applied the following day.
Note: Excessively porous areas may require an additional coat.
In ideal circumstances, 
Multithane HV  can be used without primer, provided the recommended minimum dry film thickness is achieved.


Corners, Joins, Cracks, Gaps, Penetrations and Angles
To wall/floor corners, wall/wall corners and around penetrations apply a suitable polyurethane joint sealant/mastic to form a fillet. Joins, cracks, gaps and flange surrounds must be filled and sealed with a suitable polyurethane joint sealant/mastic.
Plastic and metal angles should be firmly embedded in a bed of polyurethane joint sealant/mastic that is gap free.

Waste outlets (pipes, flanges) should be rebated into the surface to allow water to readily drain. 
Expansion joins should be filled and sealed with a suitable polyurethane joint sealant/mastic and allowed to cure. A bond breaker tape should be laid over the join and then waterproofed using 
Multithane HV  with reinforcing fabric embedded in the membrane. 


Application


Apply  Multithane HV  by brush, roller, broom and squeegee in a minimum of two coats, usually a day apart so that the minimum dry film thickness in 1.2mm. Where no primer is used, an additional coat of  Multithane HV  is recommended. The minimum wet coat thickness per coat is 0.5mm.  If  Multithane HV  is used with a reinforcing fabric (say joins or upturns), the application consists of applying a base coat of Multithane HV , laying the fabric into the wet coat, applying a saturation coat of  Multithane HV , working it well into the fabric so that the fabric is entirely saturated and covered, without wrinkles or bubbles, and allowed to cure. Apply one or two further coats of  Multithane HV  over the area.


How to waterproof a Retaining wall with sheet membrane:

 
20 x 10 x 20 Aluminium Z Section   
 
Wrimco SBS membrane 3.0mm   
torch applied fully bonded   
 
Wrimco Protection Board    
 
Duct tape to hold in place   
Wrimco Filter Fabric over   
Ag. Drain and gravel   
200mu LDPE (or Wrimco SBS membrane   
if below water table or ag. drain)   
NB Use Wrimco Tack Sheet to seal SBS membrane to LDPE if required
SBS (Styrene-Butadiene Styrene) makes bitumen elastomeric so that it can  withstand cyclic movement and cracks in the substrate up to 1mm. West Indian  bitumen gives virtually unlimited life and exceptional adhesion.   

 

Fully bonded to ensure no possibility of water tracking behind the membrane, and for greater resistance to damage.  

 

Use Protection Board for membrane protection.

 

Use Wrimco Drainage Cell with Filter Fabric if required to relieve hydrostatic  pressure.   

 

Use "Wrimco SBS Mineral" where membrane is exposed to sunlight.   

 

Fully bonded, torching as the roll is unwound upwards as shown.   

 

Non-Woven Polyester (NWP) reinforcement gives over 40% elongation and  excellent puncture and tear resistance.

Tanking Specification:   

 

  1. Waterproof tanking using Wrimco SBS Membrane, fully bonded by torch applying to a smooth, dry substrate. Hot tool chamfer all edges to eliminate interconnecting capillaries.   
  2. Before applying, remove all lumps of cement. Fill any indentations and holes filled with Styrene-Butadiene-Rubber (SBR) emulsion/mortar mix. Use no sand for fine holes but up to three parts sand for big holes. Point up blockwork if required. Lightly prime concrete and FC with Wrimco SBS Primer. Detail angles and projections with Wrimco SBS Membrane to provide 2 layers at all critical points, ensuring no air pockets, and cover.   
  3. All vertical ends to be run under flashing or aluminium "pressure seal" sealed to the wall; terminated in a reglet or fastened mechanically with a pressure seal, caulking exposed edges with Wrimco one-part acrylic or bitumen sealant: otherwise nail and cover; or turn over lip. Maximum drop without support 2.0m. Side lap 50/75mm. End lap 75/100mm and burn in granules (degranulate) if wrimco SBS Granules used.
  4. Protection Board butted and taped, to be applied shortly after water testing where practical; backfill as soon as possible with gravel or coarse sand (tanking); fit Drainage Cell and lay Filter Fabric, taking care not to block the drain (planters).

link:  http://wrimcowaterproofing.com.au/index.php?p=2_229

 

Waterproofing FAQ

Membrane Protection Board

Waterproofing Coating

Waterproof Drainage Sheet

Waterproofing Primer

Repair and Maintenance