Just Fill And Go
APP (Atactic Polypropylene) is a plastic additive blended with bitumen to enhance its performance. The resulting membrane is reinforced with polyester or fiberglass and then rolled into sheets. These sheets are torch-applied on the roof surface to form a seamless, watertight layer.
This method is widely used for:
Flat concrete roofs
Industrial sheds
Basements
Water tanks
Balconies
Given the heavy rainfall and frequent weather shifts in Katihar, waterproofing must be both heat-resistant and highly durable. Here's why APP membrane stands out:
| Feature | Benefit |
|---|---|
| UV-resistant | Protects against sun damage |
| Flexibility | Adapts to thermal expansion and contraction |
| Long lifespan | 10–15 years of protection |
| Easy installation | Can be torch-applied without major disruption |
| Economical for large areas | Ideal for commercial and residential projects |
There are different grades of APP membranes depending on thickness and reinforcement material. Common types include:
| Type | Description |
|---|---|
| 2mm plain | For general-purpose, non-critical areas |
| 3mm sand finish | Medium protection for roof and slab |
| 4mm PE film finish | High protection with polyethylene layer |
| 4mm granule finish | UV-resistant and weatherproof surface |
To ensure long-lasting results, the application must follow a professional sequence:
Surface Preparation
Clean the terrace surface, remove dust, algae, and existing coatings.
Crack Filling & Priming
Fill visible cracks using sealants. Apply bitumen-based primer to improve adhesion.
Laying the APP Membrane
The APP sheet is rolled out and heated with a gas torch to bond it to the surface. Overlaps are sealed carefully.
Sealing Joints and Corners
Extra layers are added to joints, drainage outlets, and corners for added protection.
Protective Screed (Optional)
For high footfall areas, a screed is laid over the membrane to protect it from wear and tear.
| Area | Why It Needs Waterproofing |
|---|---|
| Terraces | Direct exposure to sun and rain |
| Flat Roofs | Standing water leads to seepage |
| Bathrooms | Prevents leakage through joints and pipes |
| Water Tanks | Ensures clean water and prevents contamination |
| Basements | Protects from groundwater seepage |
Weather Resistance: Performs well in both hot summers and rainy seasons.
Low Maintenance: Minimal upkeep required for 10+ years.
Seamless Finish: Eliminates weak points in application.
Thermal Protection: Reduces heat penetration in top-floor rooms.
Cost-Effective: Offers better ROI compared to traditional cement coatings.
The cost of APP membrane installation depends on the area, thickness, labor, and brand.
| Thickness | Approx. Cost (₹/Sq. Ft.) | Use Case |
|---|---|---|
| 2mm | ₹50 – ₹70 | Small terraces, low exposure |
| 3mm | ₹60 – ₹85 | Medium-sized roofs |
| 4mm | ₹80 – ₹110 | High-exposure areas, UV protection |
Note: Prices may vary depending on site condition and contractor rates in Katihar.
Choose ISI-marked or trusted brands for long-lasting waterproofing:
Dr. Fixit
Sika
Asian Paints SmartCare
STP ShaliUrbane
Tiki Tar
A: With proper installation, APP membrane waterproofing can last 10–15 years or more.
A: Ideally, the surface should be cleaned of any old coatings for better adhesion. It’s best to consult a contractor for evaluation.
A: While mostly used for flat roofs, APP membranes can be applied on slightly sloped surfaces with proper anchoring.
A: For a 500 sq. ft. area, it typically takes 1–2 days depending on site conditions.
A: Yes, especially in areas with regular foot traffic to prevent damage to the membrane layer.
