Hotel Flat Roof Waterproofing at Hilton Petaling Jaya
Project Overview
Hotels require waterproofing systems that perform reliably under constant use, exposure, and operational demands.
At Hilton Hotel, Petaling Jaya, ARCHTECH was engaged to carry out flat roof waterproofing works covering 12,130 square feet, where leakage risks were elevated due to extensive roof detailing and service installations.
Any waterproofing failure in a hospitality environment can result in interior damage, operational disruption, and guest dissatisfaction, making system selection and workmanship critical.
Project Type: Hotel/Hospitality
Area Covered: 12,130 sq ft
Waterproofing System: Dual-System Waterproofing
Systems Used: 4-Layer Liquid Membrane System (Detailing Areas), 2-Layer Torch-On Membrane System (Open Flat Roof Areas)
Site Conditions & Waterproofing Challenges
During inspection, the flat roof was found to consist of two distinct conditions, each requiring a different waterproofing approach.
Areas with Extensive Roof Detailing
These areas included:
- Water tanks
- Satellite dishes and antennas
- Manholes and service penetrations
Such detailing creates multiple joints and transitions where:
- Water tends to collect
- Movement occurs between fixtures and the slab
- Leakage risk is significantly higher if not properly sealed
Open Flat Roof Areas
Other sections of the roof consisted of:
- Large, uninterrupted flat surfaces
- Minimal penetrations
- Clear drainage paths
These areas allowed for the use of robust sheet-based waterproofing systems.
Waterproofing Strategy & System Selection
To address the varying roof conditions effectively, ARCHTECH implemented a dual-system waterproofing strategy, ensuring each area received the most suitable and reliable solution.
Liquid Membrane Waterproofing System (Applied at detailing-heavy areas)
For areas with complex detailing and multiple penetrations, ARCHTECH applied a 4-layer liquid membrane waterproofing system, selected for its seamless application and flexibility.
Liquid Membrane System Build-Up
- Layer 1: Primer
Applied to seal the concrete surface and improve adhesion. - Layer 2: Fibre Mesh Reinforcement
Embedded to strengthen the system, distribute stress, and reduce cracking at joints and transitions. - Layer 3: Liquid Membrane
Applied to form a seamless waterproofing layer around penetrations and irregular surfaces. - Layer 4: Liquid Membrane
A second coating applied to achieve sufficient thickness and long-term durability.
This system was selected for its ability to seal complex detailing effectively, accommodate movement, and reduce leakage risks at high-stress areas.
Torch-On Membrane Waterproofing System (Applied at open flat roof areas)
For larger roof areas with minimal detailing, ARCHTECH selected a torch-on membrane system for its durability and proven long-term performance.
Torch-On Membrane System Build-Up
- Layer 1: Primer
Applied to prepare the substrate and ensure strong membrane bonding. - Layer 2: Torch-On Membrane
Heat-applied waterproofing membrane installed with controlled torching to achieve sealed overlaps and uniform coverage.
This system provides consistent thickness, high resistance to weathering and UV exposure, and reliable protection over expansive flat roof areas.
Application Methodology
All waterproofing works were executed by ARCHTECH’s trained and qualified in-house specialists, following a controlled and systematic process.
Step 1: Surface Preparation & Rectification
Roof surfaces were thoroughly cleaned.
Cracks, uneven areas, and weak points were identified and rectified to improve bonding and reduce water ponding.
Step 2: System-Specific Application
- Liquid membrane was applied at detailing-heavy areas, with careful treatment around tanks, penetrations, manholes, and joints
- Torch-on membrane was installed at open roof areas using controlled heat to ensure proper adhesion and sealed overlaps
Special attention was given to transition zones between systems to ensure continuity and waterproofing integrity.
Workmanship & Quality Control
For hospitality projects, waterproofing performance depends heavily on both correct system selection and consistent workmanship.
For this project:
- Waterproofing systems were selected based on roof condition and detailing complexity
- Installation was carried out by professionally trained and qualified in-house specialists
- Materials used were SIRIM-certified and Green-certified
- Works followed industry-accepted installation standards
- Continuous supervision ensured consistent workmanship across all roof zones
Based on the certified systems and controlled application process, this waterproofing work is backed by a 10-year warranty, providing long-term assurance for the hotel operator.
Results & Performance Outcome
Upon completion:
- Detailing-heavy areas were fully sealed using the liquid membrane system
- Open flat roof areas were protected with durable torch-on membrane
- Leakage risks at penetrations, joints, and transitions were significantly reduced
The completed works now deliver long-term waterproofing protection, supporting uninterrupted hotel operations and protecting interior spaces.
Why This Project Matters
This project demonstrates ARCHTECH’s capability to design and execute zone-specific waterproofing solutions for large-scale hospitality buildings.
Key takeaways:
- Flat roofs with complex detailing require seamless, flexible systems
- Open roof areas benefit from durable sheet-based membranes
- Proper system pairing and workmanship ensure long-term performance
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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