A Complete Guide for
DPC failure in buildings is a serious issue across Pakistan, causing damp walls, structural decay, and health risks due to mold and salt buildup. This guide provides a long-lasting waterproofing solution that works in all climates.
DPC, or Damp Proof Course, is a protective horizontal layer built into walls at the plinth level to prevent moisture from the ground rising into the structure. In Pakistani homes, especially older constructions, DPC is often neglected or poorly applied. The result?
Water seeps up through capillary action
Walls get damp and salty
Paint begins to peel
Mould and fungus may appear
Structural damage increases over time
In short, a failed DPC is more than just an eyesore. it’s a threat to your home’s integrity.
Here is a proven, professional-grade solution using high-quality products that will restore your DPC and protect your home from future moisture issues.
Using chalk or a laser level, carefully mark the visible damp areas on the wall. Be sure to check both interior and exterior sides if accessible. Use a moisture meter for more accurate detection. Mark the area at least 12 inches above the visible damage to ensure you cover all hidden moisture zones.
Use a hammer and chisel or rotary tool to remove the plaster from the marked area. Strip all the way down to the raw brick surface. This step is crucial because old plaster may contain salt deposits that can interfere with waterproofing adhesion. Be gentle around corners and edges to prevent structural damage.
Drill 10–12 mm diameter holes into the mortar joints at a 30° downward angle. Maintain 10–12 cm spacing between each hole, just above the plinth level. Use a chemical injection pump or cartridge gun to inject AQUAFIN-F slowly until the wall saturates. This creates a horizontal barrier against rising moisture and permanently stops water from wicking upward.
Tip: Wipe off excess product and avoid over-pressurizing the wall to prevent cracks.
After injection, allow 24 hours of drying. Then apply Escoflaut, a salt-resistant primer, directly on the exposed bricks using a brush. Apply two coats—first vertically, then horizontally—for complete coverage. This treatment neutralizes salt and creates a surface compatible with waterproof coatings.
Tip: Allow 4–6 hours of drying between coats depending on humidity.
Use a steel trowel to apply AQUAFIN-1K, a cementitious waterproofing material, over the entire exposed area. Maintain a uniform thickness of 1–2 mm. Work in small sections for better control and coverage. AQUAFIN-1K bridges cracks and blocks moisture ingress from all directions.
After application, keep the surface damp by sprinkling water lightly twice daily for 48 hours. This helps the material achieve full strength and adhesion. Avoid using fans or direct sunlight as rapid drying can weaken the coating.
Once cured, apply a new layer of plaster using ADIPLAST-M or AQUAFIN Seal WRP 50. These are waterproof and flexible repair mortars that bond strongly to the previous layers. Mix according to the manufacturer’s instructions and apply in 2 coats with a mason’s trowel.
Tip: Always moisten the surface before replastering to avoid flash drying.
Use AQUAFIN M30, a high-strength, non-shrink sealant, to close all injection holes. This maintains the integrity of the horizontal barrier and prevents water from re-entering. Use a putty knife or caulking gun for a smooth finish.
Lightly sprinkle water over the entire plastered surface twice a day for 2 days to promote curing. Avoid pressure spraying. This step ensures the plaster bonds well and prevents future cracking.
Allow the wall to fully dry and stabilize for at least 15 days. Then repaint with a breathable, water-resistant exterior or interior paint. Avoid oil-based or plastic paints as they trap moisture.
This isn’t just a patchwork fix. It’s a full restoration system designed to tackle DPC failure at its root.
Ignoring DPC failure today can cost you thousands tomorrow. Whether you’re a homeowner, builder, or contractor, using the right materials and following the right steps is essential for a moisture-free building.learn more.
Stay tuned for our downloadable checklist, and if you need help, reach out to Grace Chemical SMC Pvt. Ltd. for a professional inspection and quotation.
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