Kolkata is getting hotter every year making the room temperature unbearable for residents, specially on the top floors. Many homeowners struggle with excessive heat inside their houses, leading to high electricity bills due to air conditioners, says heatproof painting Kolkata expert. But what if you could reduce indoor temperatures by 5-10°C naturally — without taking help of air conditioner?
The solution is overdeck insulation with XPS (Extruded Polystyrene), a method of waterproofing cum heat insulation that’s getting popular in the recent days.
What’s Overdeck Insulation with XPS?
While most of the insulations are installed on the inner surface of the structure, overdeck insulation is applied above the roof slab instead. As said by a sun-shade installation expert in Kolkata, Engr. Koushik Sarker, XPS (Extruded Polystyrene) is a rigid foam board with excellent thermal resistance and water resistance. This method prevents heat from entering the roof while also ensuring complete waterproofing.
How is XPS Different from Other Insulation Methods?
Most of the popular roof insulation methods in India use PUF panels, Glass Wool, EPS (Expanded Polystyrene), or Heat-Reflecting Paint. Let’s check what’s the difference between these popular methods:
| Material | Approx. Cost per sq. ft. | Lifespan | Thermal Resistance (R-Value) | Water Resistance | Heat Reduction | Maintenance Cost |
| XPS (Extruded Polystyrene) | ₹70-100 | 25+ years | High | Excellent | 5-10°C | Low |
| EPS (Expanded Polystyrene) | ₹40-60 | 10-15 years | Medium | Poor | 3-5°C | Medium |
| Glass Wool | ₹50-80 | 10-12 years | Medium | Needs protection | 3-5°C | Medium |
| PUF Panels | ₹80-120 | 15-20 years | High | Absorbs moisture over time | 5-8°C | High |
| Heat-Reflecting Paint | ₹40-60 | 3-5 years | Low | No waterproofing | 2-4°C | Needs re-application every 3-5 years |
Key Benefits:
- XPS offers most effective and long-term insulation with both heat protection and waterproofing, says roof waterproofing Kolkata expert.
- On the other hand, heat-reflecting paints, manufactured by Asian Paint and other brands is the cheapest option but offers limited heat reduction and requires reapplication within 7 to 10 years.
- PUF panels & Glass Wool require additional moisture protection, increasing maintenance costs and is not suitable for rooms that leak water or have dampness, explained an expert of home repair service near me Kolkata.
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How Much Does XPS Reduce Heat?
Many people have doubts regarding the effectiveness of XPS insulation. Mr.Koushik said that in a recent work that they completed at Kolkata, they found an exciting result where the indoor temperatures dropped by 5-10°C. Do you know what this means?
- Less dependence on ACs and coolers: Up to 30% savings on electricity bills.
- Comfortable indoor environment: No more suffocating summer heat.
- Zero leakage issues: Ensures a waterproof roof even during heavy monsoons.
Ideal for Kolkata’s Climate
Kolkata is an overcrowded city with high humidity and of course extreme heat. So, as per an Asian Paints roof waterproofing Kolkata expert in such situation XPS insulation can be one of the perfect solutions because:
✔ Keeps rooms cooler in summer.
✔ Prevents roof cracks caused by temperature fluctuations.
✔ Protects against water seepage, ensuring longer roof life.
Should You Go for XPS Overdeck Insulation for Heat?
If you live in Kolkata and face intense summer heat and roof leakage problems, investing in XPS overdeck insulation is a smart and long-term solution. Though the initial cost is higher, the energy savings, comfort, and roof protection make it worth every rupee.
