With summers come heat, humidity, and expenditures; these factors are handled by cool roofs (film or sheet application on concrete, metal, or tiles). The covers help to reduce the internal temperature of closed structures, preserve assets, and ensure hygiene. According to research, solar reflectance from a cool roof can minimize demands by 11-27%. So, why the wait? Opt for Cool Roof Services today!
There are several types of roofing materials used to reduce the interior temperatures in a closed structure. Modified bitumen, metal roofs, green roofs, asphalt shingles are some examples.
Let’s discuss!
Modified Bitumen Systems
This system utilizes sheet membranes made from asphalt (modified with plastic or rubber compounds) and reinforced with glass or polyester. The surface ply is mass-produced with embedded mineral granules. Previously, these granules offered reflective values between 0.25-0.27. However, as the need for energy savings increased, manufacturers developed brighter granules with higher reflective values (0.70-0.80).
The color of the granules is not uniform; Slight variations from lot to lot occurs, which, in turn, leads to an irregular appearance. However, it can be managed by the applicator as to how he avoids the uncontrollable bleed out by the adhesive. White coating is an effective measure to ensure a high-quality finish.
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Single-Ply Membrane Systems
Single-ply membrane systems comprises synthetic sheets designed from various compounds (with or without additives). It is applied as a single layer, fastened by adhesives or ballast. These membranes are available in white, offering the perfect reflectance that one can think of.
Single ply membranes are available in different sizes, typically 1.1mm to 2mm. While some membranes are homogeneous, others are strengthened with polyester or glass-fiber. These covers are sealed at joints to form a continuous chain. And, when joined with insulation and support, form long-lasting roof systems.
Membrane Types
CPE – Chlorinated Polyethylene
CPE is bitumen-compatible. Moreover, it is softened with chlorine and welded by heat.
EPDM – Ethylene Propylene Diene Terpolymer
EPDM is a carbon-reinforced flexible material applied with a special primer. The joining process is carried out with tape bonding. However, adhesives can also be used.
FPO – Flexible Polyolefin
FPO is managed by polyethylene or polypropylene. Lap preparation is a vital requirement before the welding process. FPO based membranes are suitable for direct connection with bitumen. Lastly, these membranes are recyclable.
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PVC – Polyvinyl Chloride
PVC is a flexible form of plastic that can be solvent or heat welded. This membrane is preferable for flat or low-slope roofs.
TPE – Thermoplastic Polyolefin Elastomer
This compound belongs to a group of polyolefins with some properties of elastomers. TPE is resistant to UV and ozone. Moreover, it does not absorb moisture.
Built-up Roof Systems
Built-up roofing systems are based on multiple reinforcements with bitumen interply adhesives. BUR systems are applied with a mixture of bitumen and gravel. Although it has a strong past performance, the rise of reflective cool paints was preferred by customers, and with the passage of time, replaced the BUR system completely.
Types of BUR Systems
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Hot-Asphalt Build-Up
In this process, the base sheet is covered with asphalt together with an added layer of felt (ply-sheet).
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Cold Build-Up
Cold build-up roofing systems utilize asphalt-coated fiberglass sheets with solvent-based asphalt adhesives. The first sheet is attached to the insulation with embedded plies. The membrane is, thereon, covered with an aggregate surface. Cold build-up roofing can be applied on new surfaces as well as repaired ones.
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Ballasted Asphalt Build-Up
This covering is managed with hot asphalt and cold build-up. Each layer forms an additional barrier; the system is enclosed with a mineral-based or asphalt-gravel sheet.
Other Systems
Apart from the above-mentioned roofing types, there are other systems as well.
- Metal Roofs
- Asphalt Shingles
- Pigmented Coating
- Green Roofs
- Foam Roofs
So, are you ready for a cool roof application? Contact Waterproofing Experts, the best company roof waterproofing and heat proofing in Karachi, Pakistan. Our cool roof services are recognized by clients throughout Pakistan, especially in Lahore, Quetta, Faisalabad, Sibi, Swat, Sukkur, and other cities.
