Waterproofing Suspended Concrete Slab

Sealing Below the Suspended Slab

Sometimes the slabs crack and water penetrates into the area below. Many cases the chances of completing a repair from the water side (top) is almost impossible. The cost of repairs 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 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. Loose materials are removed 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. Any missing mortar can be replaced with MAXREST

4. Any dummy, expansion or construction joints are to be filled with MAXJOINT ELASTIC and coated with MAXSEAL FLEX and MAXMESH  150 mm joint cover.

5. 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 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

First part of Waterproofing Suspended concrete slab this way is to spread the Drizoro Maxseal Super below the slab itself before the pour.

Second part of the application is carried out on the fresh concrete after leveling. The concrete slab now has enough strength to be walked over. But still fresh enough to dampen the surface when troweled.
Spread the Maxseal Super in powder form as supplied. The ratio of is 1,5 to 2,5 kg/m2. Endeavour to achieve a complete and uniform coverage. Immediately after spray 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

Further Reference can be found to this process on the Drizoro Maxseal SUPER page


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 suspended slab using MAXGRIP










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

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