Commercial Flat Roof Waterproofing at Sime Darby Gallery, Serenia City, Sepang
Project Overview
Sales galleries represent a developer’s brand image and customer experience.
At Sime Darby Gallery, Serenia City, ARCHTECH was engaged to carry out flat roof waterproofing works covering 7,298 square feet, where water ingress could affect interior finishes, display areas, and daily operations.
Unlike purely functional buildings, sales galleries require waterproofing solutions that are durable, visually clean, and reliable, as even minor roof leaks can disrupt client visits and presentation spaces.
Project Type: Sales Gallery/Commercial Show Facility
Area Covered: 7,298 sq ft
Waterproofing System: Primer + Torch-On Membrane
Site Conditions & Waterproofing Challenges
During the site assessment, several conditions were identified that required careful system selection and execution:
- Flat roof configuration exposed to prolonged rain and direct sunlight
- Early-stage surface cracking, increasing the risk of future water penetration
- Localised uneven areas, contributing to water ponding after rainfall
- Finished interior spaces below, increasing sensitivity to leakage
As the building was actively used, any waterproofing failure could lead to visible ceiling stains, maintenance disruptions, and reputational impact.
Waterproofing Strategy & System Selection
After evaluating the roof condition and usage requirements, ARCHTECH recommended a primer and torch-on membrane waterproofing system, selected for its suitability on flat roof structures requiring long-term performance and surface consistency.
Why This System Was Appropriate
- Strong adhesion when combined with proper surface priming
- Continuous membrane coverage, reducing leakage points
- High resistance to UV exposure and thermal movement
- Proven reliability for commercial and developer-owned properties
This system provides a balance between durability, performance, and maintenance reliability
Application Methodology
All works were executed by ARCHTECH’s trained in-house waterproofing specialists, following a structured and controlled process.
Step 1: Surface Preparation & Priming
The roof surface was cleaned and prepared to remove contaminants and weak layers. Primer was applied to enhance bonding and ensure uniform adhesion of the membrane.
Step 2: Torch-On Membrane Installation
Torch-on membranes were installed using controlled heat to ensure:
- Proper bonding to the substrate
- Fully sealed overlaps
- Consistent membrane thickness across the roof
Detailing works were carefully carried out at joints, edges, and drainage points to reduce the risk of future leakage.
Workmanship & Quality Control
For commercial and developer-owned buildings, waterproofing performance depends not only on the system used, but also on how surface defects are properly treated before installation.
For this project:
- Surface cracks were identified, prepared, and treated prior to membrane application to prevent water ingress through weak points
- Uneven areas were corrected and levelled to minimise water ponding and ensure uniform membrane bonding
- Waterproofing works were carried out by trained and qualified in-house specialists
- Application followed industry-accepted installation standards
- Materials used were SIRIM-certified and Green-certified
- Continuous supervision ensured consistent workmanship across the entire roof area
As a result of proper surface rectification, certified system selection, and controlled application, this waterproofing work is backed by a 10-year warranty, providing long-term assurance for the property owner.
Results & Performance Outcome
Upon completion:
- The 7,298 sq ft flat roof area was fully sealed
- Surface consistency was improved to reduce water ponding risks
- The waterproofing system now delivers long-term protection backed by a 10-year warranty
The completed works help safeguard:
- Interior finishes and display areas
- Day-to-day gallery operations
- The developer’s brand presentation
Why This Project Matters
This project demonstrates ARCHTECH’s ability to deliver reliable waterproofing solutions for brand-sensitive commercial properties, where performance, workmanship, and appearance all matter.
Key takeaways:
- Flat roofs require proper system selection, not surface repairs
- Early-stage intervention prevents long-term damage
- Consistent workmanship is critical for commercial reliability
About ARCHTECH Waterproofing Specialist
With over 10 years of expertise, ARCHTECH delivers precise, long-lasting waterproofing solutions for residential, commercial, industrial, and institutional buildings.
By combining accurate site assessment, certified professional-grade materials, and trained in-house specialists, ARCHTECH ensures durable waterproofing performance designed to stand the test of time.
Looking for Flat Roof Waterproofing Solutions?
If your property requires dependable flat roof waterproofing — whether for commercial, institutional, or developer-owned buildings — contact ARCHTECH for a professional assessment and a solution designed for long-term reliability.
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