Three membrane families dominate Nigerian waterproofing - bituminous sheets, liquid-applied polyurethanes and polyureas, and cementitious slurries. Each one is right for a specific job, and badly wrong for the others.
Bituminous
Bituminous sheets are the workhorse of Nigerian flat-roof waterproofing. They are tolerant of imperfect substrates, they install fast, and the labour is well understood. Their weakness is detailing - every penetration is a potential failure point.
Liquid
Liquid-applied polyurethane is the right answer for complex geometry - pool perimeters, plant rooms, anywhere with many small details. It is more expensive per square metre, and it punishes a wet or contaminated substrate.
Cementitious
Cementitious slurries are for positive-side application on potable water tanks, swimming pool shells, and basements where you have access during construction. They are rigid, so they crack with substrate movement.
The honest rule
Match the system to the job. Most Nigerian failures we see come from forcing one family to do another family's job.
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