Keeping away heat from reaching the home’s interior is a tough task, especially in a metropolis like Karachi. Tropical climate and monsoons can create disastrous effects for premises, whether commercial or residential. Moreover, trapped heat can develop inside homes and reduce comfortability, interfere with temperature tracking, and increase expense.
Because of frequent power breakdowns and high utility bills, running ACs and room coolers is not a feasible option. To tackle the issue, roof heatproofing is the best option, especially if your dwelling is just below the roof structure.
Different companies are providing heat proofing services across Karachi, Pakistan. As most homeowners and corporate entities are unaware of the process, we will provide a detailed explanation on keeping your place cool and relaxing. After all, “a good home must be made, not bought”, according to Joyce Maynard, the renowned American novelist.
Following are some heat resistant techniques that can be applied on roofs:
Heat Resistant Sheets
Apart from providing thermal insulation, heat-resistant sheets are corrosion resistant, flexible, and durable. They can be classified into three types:
- Tiled heat insulation sheet
- Corrugated heat resistant sheet
- Troughed heat proof sheet
Mostly, tiled insulation sheets are constructed from galvanized steel, aluminum or clay with a specific gauge. These sheets are quicker to install than traditional tiles, saving time and money and reducing labor costs. They come in different colors with anti-condensation backing.
These sheets offer several advantages:
- Low maintenance
Corrugated heat resistant sheets are made from premium-quality materials. Being lightweight, corrosion and heat-resistant, customizable, and safe to use, these sheets can deliver optimal results. These sheets are perfect for side-cladding buildings, which include barns, stables, garages, and more. Furthermore, the covering can handle extreme weather conditions.
Troughed heat-proof sheets are used to cover single-family houses, halls, garages, and other facilities. It is made from galvanized steel and treated with chemicals to augment corrosion-resistance and paint adhesion. Furthermore, epoxy and polyester resins are applied by reverse coating technique and warmed in digitally-controlled ovens.
Modified Bitumen Membrane
Modified bitumen membrane consists of sheets of plasticized or rubberized asphalt bonded with rolled reinforcing fabric or fiberglass. It is applied on the surface with cool adhesive or hot asphalt. Because of low solar reflectance, commercial bitumen sheets are capable of absorbing the Sun’s rays. However, a white coating can raise the reflectance to acceptable standards. Preferable for low-slope or flat roofs.
There are two types of modified bitumen membranes:
- APP Membranes
- SBS Membranes
Also known as plastic asphalt, APP (atactic polypropylene) membranes are prepared from asphalt mixed with polymers; the polymers change form (become elastic) under high temperatures. It is resistant to UV radiation.
SBS membranes (styrene-butadiene-styrene) comprises of asphalt with polymerized rubber for better elasticity and flexibility. These membranes are optimal for rooftops enduring extreme temperature changes and high winds.
Modified bitumen coatings are multi-layered. The five layers include:
- Modified Base Sheets
- Modified Bitumen Membranes
Cool Roof Coatings
Rooftops with reflective coatings help overcome the ‘urban heat island’ effect by absorbing less heat and UV radiation. It can reduce indoor temperatures by almost 30%.
According to NRDC (National Resources Defense Council), roofs with reflective coatings can reduce energy costs and carbon pollution. This method is cost-effective and beneficial for different types of roofs, including flat, hip, and mansard. Special pigments or colorants are used to reflect invisible light. Light-colored coatings reflect around 30-60% of light.
White Coating or White Paint?
Paint-based roofing products or elastomeric coatings differ in many respects. The former is inflexible after application. In other words, it cannot manage high temperatures of the Sun. Elastomeric paints are more adaptable and functional; their solar reflectivity index and thermal emittance is close to 1.
Below are some key differences between the two:
|Low useful life
|High useful life
|Can be applied by novices and experts
With rising global warming and fluctuating climate, it is necessary to protect your home from the harmful rays of the Sun. According to research, cool roof paints or emulsions can reduce cooling demands of tall buildings or homes significantly. The best roof coatings are long-lasting and effective: For people living on top floors, covering rooftops is a must.
If you are searching for an expert roof coating service, contact Lakhwa Chemical Services