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How to waterproof a Retaining wall :  

 

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 LPPE (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.  

 

Protection desirable and PB4 insulates (R-value 0.3 and IIC sound rating 53) and acts as expansion/contraction joint.

 

Use Wrimco Drainage Cell with Filter Fabric if required to relieve hydrostatic pressure on wall in lieu of "PB4".  

 

Use "Wrimco SBS Granual" 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 "Screedbond" 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 Z-section (20x10x20mm) 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

 

 

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