Waterproofing - Case 2
Tanking B-Inaccessible areas In some cases, areas behind retaining walls are inaccessible what makes it impossible to apply the waterproofing system on the retaining wall, rather apply it on the vertical surface of the excavation, after it has been shotcreted.
Bituminous membrane on anchored shotcrete Recommended products
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Jointseal.PU + Gun Biflex.PL
Waterproof.prime WB
or Jointseal.PU - MC
Aluminium flashing
Proboard
When the space between excavation and structural wall is too narrow and the waterproofing is applied on the excavation side before casting the structural wall, this is called internal tanking.
Surface preparation Recommended products
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Conrep.331 TX
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Conrep.440 PR
Waterproof.150 BLC
Excavation walls on which waterproofing membrane is to be applied should be stable, solid and plane surface. Stability is insured either vertically before excavation, by anchoring piles/secant piles/diaphragm wall or horizontally during the excavation phases by casting temporary beams anchored inside the soil with inclined postensioning cables. Solid and plane surface is obtained by shotcreting the whole vertical surface or by building straight blockworks.
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The following preparation should be observed: • Voids or Honeycombs should be filled using non shrink mortar Conrep.331 TX • Protruding anchors should be cut and filled with epoxy mortar Conrep.440 PR • Source of water leakage should be stopped by plugging instant setting mortar Waterproof.150 BLC