Many times, clients see black plastic sheets being spread during construction at the DPC (Damp Proof Course) level and wonder why money is being “wasted” on nylon. That sheet is not ordinary nylon, it is called a DPM, which means Damp Proof Membrane, and it plays a critical role in protecting your building.
What is a DPM?
A DPM is a thick polythene sheet placed on the foundation or at the DPC level before casting the oversite concrete. Its function is to stop ground moisture from penetrating the floor and walls of your building.
Why is it Necessary?
1. Moisture Control
Soil naturally contains water. Without a DPM, this moisture rises into your walls and floors. Over time, you will see damp patches, peeling paint, mold, and unhealthy living conditions.
2. Durability of Structure
Moisture weakens plaster and finishes, leading to frequent repairs. A proper DPM saves you maintenance costs and extends the life of your house.
3. Healthy Indoor Environment
When dampness enters a house, it attracts mold and fungi, which cause bad smells and can affect your health. The DPM creates a barrier that keeps your interior dry and comfortable.
4. Energy Efficiency
Dry walls and floors are easier to keep cool. Without dampness, your building responds better to ventilation, reducing the strain on fans or air conditioning.
In Nigeria’s hot and humid climate, dampness spreads faster than you think. Many old houses without DPM show this problem clearly, with water lines visible at the lower part of the walls.
The truth is simple, a building without DPM is like wearing shoes in the rain without socks, water will always find its way in.
So when next you see that black sheet on site, know it is not waste, it is insurance for your building’s comfort, durability, and value.
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