Waterproofing Suspended Concrete Slab

Sealing Below the Suspended Slab

Sometimes the slabs crack and water penetrates into the area below. In many cases, the chances of completing a repair from the waterside (top) are almost impossible. The cost of repairs are prohibitively exorbitant. This often, means necessary repairs to stop leak/s are often delayed or avoided completely.
The only option is to seal your slab from where the leak is showing. This type of repair is usually a lot cheaper, cost reduction of maybe as much as ten times.

Waterproofing Suspended concrete slab with drizoro

Waterproofing Suspended concrete slab from below. The bottom (not the water side) requires a number of Drizoro Products


Waterproofing Suspended concrete slab from Below the Method used is

1. Remove all loose materials from the suspended concrete slab. (surfaces to be treated). Ensuring a clean and sound surface for the application.

2. Any damage to the slab surface should be repaired using MAXREST where there is no running water. MAXPLUG. is used where water is running.

3. Use MAXREST to replace any missing mortar.

4. Fill expansion/construction joints with MAXJOINT ELASTIC. Coat repaired joint with MAXSEAL FLEX and MAXMESH  (150 mm joint cover).

5. Bridge Hairline fractures up to 3.5mm wide can be coated with MAXSEAL FLEX without filling.

6. Apply MAXSEAL FLEX To a damp clean surface ensuring even coverage. Allowing the masonry substrate to follow the moisture into the porous surface, overlap 50mm onto MAXSEAL FLEX at the joint.

7. Leave to cure for a period of 3 days minimum before the laying of the tile bed.


Sealing a suspended Concrete Slab with Drizoro Maxseal Super

drizoro-maxseal-super-online-waterproofing-slabs-wall-dusting-mechnical-trowel-finish, Waterproofing Suspended concrete slab

Part 1: Waterproofing the Suspended Concrete Slab- This way is to spread the Drizoro Maxseal Super below the slab itself before the pour.

Part 2: the application is carried out on the fresh concrete after levelling. The concrete slab has cured enough to be walked on. But still fresh enough to dampen the surface when troweled.
Spread the Maxseal Super in powder form as supplied. The ratio is 1,5 to 2,5 kg/m2. Endeavour to achieve complete and uniform coverage. Immediately after spraying the surface with water to prevent the superficial drying of the slab and to make the power troweling smoother.
Troweling provides a monolithic waterproof layer. Dampening the surface during this process to improve penetration. This prevents an excessively quick drying, which would prevent proper hydration of Drizoro Maxseal® SUPER.
Treat and seal around all areas such as columns, penetrating pipes, corners, concrete joints, and expansion joints prior to general application.

See below

Reference: Drizoro Maxseal SUPER


Protrusions & fixing to Suspended Concrete Slab


Seal around any protrusions using MAXJOINT ELASTIC

then coat with MAXSEAL FLEX and MAXMESH  150 mm joint cover.

Fix fittings & bolts to the suspended slab using MAXGRIP










Note – Specification information is based on information from the manufacturer and from our own experience. Use the information contained here in conjunction with the appropriate technical data bulletins, and material safety data sheets. These are available from our office or website. © DRIZORO S.A. All rights reserved.

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