How do you check wet area membranes in Qardho?

Wet area membranes competency risks in Qardho start with a gap between what a bidder claims and what can be shown. A firm can promise waterproofing experience without producing product data sheets, substrate photographs or a flood test result. Without that evidence, the client carries the leak risk. The check is straightforward: ask for records, not assurances, and confirm the details on site.

What evidence should a wet area membrane bid include?

A competent bid names the membrane system and attaches current product data sheets showing it suits a wet area. Ask for the manufacturer's installation instructions, not a supplier's verbal summary. Request photographs of the substrate before the membrane went down: clean, sound screed or blockwork, with corners and pipe penetrations detailed.

Ask who applies the liquid membrane or lays the sheet, and whether that person has done it before on a comparable job. A written method statement should list primer, number of coats or laps, curing time between coats and protection of the finished layer.

As general practice, confirm these figures against the project's specification or engineer. Where no specification exists, ask the person pricing the work to state the system, the coverage and the test method in writing on the tender. A bid that cannot name a product or a test is not evidence of competency.

Where does the gap turn into a leak?

A leak begins where the record is missing. If nobody checked the substrate, the membrane may sit on dust, loose screed or a damp surface, and adhesion fails. If nobody detailed the corners, the shower tray junction or the pipe penetrations, water finds those points first.

Falls matter too. A floor that does not drain towards the outlet holds water against the membrane, and a flood test will show it. Ask the tiler or the site supervisor which way the floor falls and how it was set.

On site, the visible signs of a weak job appear below and beside the wet area: damp patches on a ceiling, blistering paint, a musty smell in a wardrobe, or grout that keeps darkening. Ask the building's users what happens after the Gu and Deyr rains, when humidity rises and any hidden gap shows itself.

How do you check a contractor's wet area membrane claims in Qardho?

You check by walking a finished wet area the bidder built and asking for its flood test result. A flood test is simple: pond the floor, leave it, and check the level and the room below. Ask whether the contractor holds a record of that test, signed and dated.

If the bidder cannot name a recent bathroom or kitchen, that is your answer. Where a name is given, ask the owner whether the room leaked and how quickly it was fixed. Do not rely on a photograph of tiled finishes; the membrane is under the tiles.

The Qardho materials market and supervision norms are things to check, not assume. Suppliers can tell you which membrane products they stock and whether they can supply the same batch for the whole job. Ask the municipal engineer's office what it holds on file for the plot or the area before you accept a claim about local practice.

What to do next

Before you sign, request three items from each bidder: the product data sheet, the method statement and one flood test record with a contactable owner. Then walk one finished wet area the firm built. If the bidder has no record, price the risk into your decision or choose another firm, and check what your contract allows regarding retention and defects.