A damp seal, typically referring to damp-proof paint or membranes, works primarily by creating a barrier that either prevents moisture from penetrating a wall or actively manages existing moisture.
Here's a breakdown of the different ways damp seals function:
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Waterproofing Barrier:
- Mechanism: Some damp-proof paints contain waterproofing agents like polymers and resins. These agents create a non-porous surface on the wall, preventing water from seeping in. Think of it like a raincoat for your wall.
- Application: They are typically applied in multiple coats to ensure complete coverage and a robust barrier.
- Effectiveness: Effective against penetrating dampness (e.g., from rain).
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Moisture Absorption and Management:
- Mechanism: Other types of damp-proof solutions contain materials that absorb moisture. These materials draw moisture away from the wall's surface and into the paint or membrane itself. The moisture then evaporates into the air. This helps to keep the surface of the wall dry.
- Application: Applied as a coating on affected walls.
- Effectiveness: This type is often used to address condensation problems or rising damp.
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Creating a Breathable Membrane:
- Mechanism: Some damp-proofing systems use breathable membranes. These membranes allow moisture vapor to escape from the wall while preventing liquid water from entering. This is crucial for older buildings where trapping moisture can lead to more significant problems.
- Application: Can be applied to internal and external walls.
- Effectiveness: Important for managing moisture in situations where complete waterproofing isn't desirable or possible.
In summary, a damp seal works by either creating a physical barrier against moisture intrusion, actively managing existing moisture through absorption and evaporation, or allowing the wall to "breathe" while still preventing liquid water penetration.
