How to stop leaks through a tiled deck without removing the tiles and mortar bed and re-waterproofing structural elements with liquid membrane or sheet membrane.
Water normally penetrates through the grout and especially via cracks at the perimeters. If there are any cracks present, then sealers will not be effective. Hence the first action is to grind out the cracks and seal with polyurethane joint sealants.
Since any sealer will encapsulate any dirt, mould or stains, these should be removed with a Gerni, possibly after soaking with bleach, to provide a clean surface.
We offer five possible solutions:
Clear solvent based acrylic sealer(hydrophilic):
Brush grout and then roll entire area.
Repeat when dry.
Leaves a gloss finish that highlights the dark colours in the tiles and hence must be used over the entire area for uniformity of appearance. If tiles are glazed, only apply to the grout.
S900 matt finish, clear solvent based siloxane (hydrophobic):
Leaves a matt finish with little effect on colour also can be re-applied. Mostly used on brickwork or porous tiles. If tiles are glazed, only apply to the grout.
WOS clear water based fluro chemical sealer (hydrophobic).
Penetrates more than the above and hence provides protection even after surface wear due to traffic. Glazed tiles should be tested for adhesion.
Re-waterproof with polyurethane modified acrylic liquid membrane.
Re-waterproof with torch applied sheet membrane,
suitable when the pleasing appearance of tiles is not a priority. Attention to perimeter detailing is required but is not normally a problem.