Waterproofing Services in Karachi: Roof, Water Tank, Bathroom & Heat Proofing

We clean the roof, open and fill the cracks, treat the corners where the slab meets the parapet, and then apply a waterproof membrane across the whole surface, turned up the parapet wall so water cannot get behind it. On roofs that still carry the old mud and brick-tile layer, we survey first to decide whether the tiles can be sealed over or must come off. Sealing over a layer that is already saturated traps the water underneath, so we will tell you if removal is the honest answer.

Heat proofing and waterproofing solve different problems, but on a Karachi roof they are best done together. Heat proofing uses a light-coloured, reflective top coat that sends much of the sun's energy back before it soaks into the slab, so the room below stays cooler and air conditioning works less hard. Applied over a waterproof membrane, it also shields that membrane from the ultraviolet light that ages it. Doing both in one visit means one surface preparation and one set of curing days instead of two.

A leaking underground sump loses water you have paid a tanker for, and a crack that lets water out can also let ground water and sewage seepage in. We empty and clean the tank, repair cracks and joints, and line the inside with a coating approved for drinking-water contact, so nothing in the lining leaches into the water you store. We often combine this with underground tank cleaning, since the tank has to be emptied for both. For larger sites we treat tanks under our commercial water tank programme.

In Karachi flats, a leak in one bathroom becomes the neighbour's ceiling problem below. The water usually escapes through failed grout, the joint where the floor meets the wall, or around the drain and pipe entries. Where we can, we treat leaks without breaking the tiles, by sealing joints and injecting the gaps. Where the waterproof layer under the tiles has failed completely, we explain why the floor has to be opened, and we waterproof the bare floor and the lower walls before it is tiled again.

Basements, underground parking and lift pits sit below the water table in parts of Karachi, so water pushes in from the soil side. We seal active leaks first, then apply a cement-based waterproofing that bonds into the concrete and works against water pressure from outside. It is the right system where the outside face of the wall can no longer be reached.

Paint that bubbles at the bottom of a wall, white salt marks, and plaster that crumbles at plinth level all point to rising damp or seepage from outside. We find the source first, whether that is a broken damp-proof course, a leaking pipe in the wall, or rain driving into the outer face, and treat that source rather than repainting over the symptom.

Large buildings are built with joints that let sections move. Those joints are a common leak point when the original sealant hardens and splits. We cut out the failed material and refill the joint with a flexible sealant that stretches as the building moves, and we seal structural cracks in slabs and walls the same way.

Factory and warehouse roofs leak at the overlaps between sheets, at every bolt, and along gutters. We seal the laps and fixings and coat the roof with a flexible system made for metal, which also reflects heat away from the floor below. For warehouses we already treat for pests, this can be scheduled around the same visit.

The cheapest time to waterproof is before a building is finished. At foundation and slab stage we apply waterproofing to surfaces that will be impossible to reach later. Builders and owners who already book our pre-construction termite proofing can schedule both at the same stage of the build.