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Overview of Roofing Systems for Flat and Low-Slope Roofs
There are several types of roofing systems designed for flat and low-slope roofs, each offering unique benefits. Single-ply roofing, including TPO, EPDM, and PVC, is lightweight, durable, and energy-efficient. Modified Bitumen Roofingprovides excellent waterproofing and flexibility, using either SBS or APP membranes. Inverted Roof Membrane Assembly (IRMA) protects the waterproofing layer by placing insulation on top, improving durability and energy efficiency. Built-Up Roofing (BUR) is a traditional multi-layered system that combines bitumen and reinforcing fabrics for superior waterproofing and longevity. Each system varies in installation, cost, and maintenance, making it essential to choose the right one for specific building needs.
Single-Ply Roofing
A lightweight and flexible roofing system that uses a single membrane for waterproofing. Common types include:
TPO (Thermoplastic Polyolefin) – Energy-efficient, UV-resistant, and heat-welded for strong seams.
EPDM (Ethylene Propylene Diene Monomer) – A rubber membrane known for flexibility and durability.
PVC (Polyvinyl Chloride) – Chemical and fire-resistant, ideal for industrial and restaurant applications.
Modified Bitumen Roofing
A multi-layered asphalt-based system designed for flat roofs, offering excellent durability and flexibility.
SBS (Styrene-Butadiene-Styrene) – Elastic and flexible, can be installed with hot asphalt or adhesives.
APP (Atactic Polypropylene) – More rigid and heat-resistant, often installed with a torch-down method.
Inverted Roof Membrane Assembly (IRMA)
A system where the waterproofing membrane is installed beneath the insulation, protecting it from weather, UV exposure, and mechanical damage. Often used in green roofs, solar installations, and high-traffic commercial applications.
Built-Up Roofing (BUR)
A traditional roofing system made of multiple layers of bitumen and reinforcing fabrics, topped with gravel or a protective coating. Known for superior waterproofing, durability, and fire resistance, BUR is widely used in commercial buildings and high-traffic areas.