DPM (Damp Proof Membrane) is available in various sizes, typically defined by thickness (gauge/MU) and roll dimensions. Here's a breakdown of common DPM sizes:
Generally, DPM comes in the following sizes:
- 125MU / 500 Gauge Clear: 4m x 25m per roll (100m²)
- 125MU / 500 Gauge Black: 4m x 50m per roll (200m²)
- 250MU / 1000 Gauge Clear: 4m x 25m per roll (100m²)
Understanding the Specifications:
- MU (Microns): Represents the thickness of the membrane in micrometers. 125MU is equivalent to 0.125mm, and 250MU is 0.25mm. Higher MU indicates greater thickness and durability.
- Gauge: Another unit for measuring thickness. 500 Gauge is roughly equivalent to 125MU, and 1000 Gauge is roughly equivalent to 250MU.
- Roll Dimensions: Specifies the width and length of the DPM roll (e.g., 4m x 25m).
- Area Coverage: Calculates the total area the roll covers (e.g., 100m² or 200m²).
Why Different Sizes Matter:
- Application: Different applications may require different thicknesses and roll sizes. For example, a larger area might benefit from a wider roll to reduce the number of seams.
- Durability: Thicker DPM (higher MU/Gauge) offers better resistance to punctures and tears, making it suitable for more demanding applications.
- Cost: Thicker and larger rolls typically cost more, so selecting the appropriate size and thickness for the specific project is crucial.
