Buildings Department Registered Contractor (MWC 23/2025)
Led by qualified persons registered with the Buildings Department. We go beyond simple sealant repair to provide deep structural reinforcement of window frames.
Avoid unnecessary full window replacement – enjoy the most cost-effective, long-lasting waterproof solution.
The window sill is an important structural platform beneath the window. Due to prolonged exposure to wind and rain, concrete cracks, or sealant failure at joints, rainwater easily accumulates and penetrates indoors, leading to wall mould, concrete spalling, and property damage. EJW provides professional window sill waterproof restoration services. Through detailed site inspection, we tackle the root structural issues, including crack repair, waterproof mortar application, and the use of Sika high-performance waterproofing materials. We are committed to completely resolving structural problems, delivering long-lasting dry and comfortable protection for our clients.
Incorrect hinge positioning or aging causing hinges to sag and shift, preventing the window from closing tightly and creating gaps that allow water ingress. This is the most common cause.
Black waterproof sealant on aluminium window frames and sashes loses sealing when aged, damaged or detached, causing rainwater leakage. Sun, rain and temperature exposure accelerates deterioration, weakening overall waterproofing. Routine maintenance is essential.
Deformation of the aluminum window frame itself, or cracks in the adjacent wall structure, allowing water to penetrate through gaps or structural breaches.
EJW : Professional Aluminium Window Waterproofing Solutions
With years of extensive experience in aluminium window repair and waterproofing, EJW provides systematic and effective solutions tailored to different leak causes, helping you completely resolve persistent home seepage problems.
Common causes of aluminium window leaks include improper installation or aging and sagging of window hinges, as well as hardening and detachment of sealant edges. EJW’s team conducts precise on-site inspections, assesses hinge conditions, and replaces them with high-quality stainless steel components. We also thoroughly remove old sealant and install new high-durability weatherproof sealant strips, restoring excellent sealing performance and quickly resolving daily leakage issues.
For structural problems such as window frame deformation or seepage from wall cracks, EJW offers in-depth repair services. After comprehensive structural assessment, our professional team will carry out replacement or correction if high-level work is required. Key works include re-sealing the connection between the window frame and concrete, and applying high-performance Sika structural sealant to ensure long-lasting waterproofing performance and provide you with reliable, durable protection.
EJW has established a systematic inspection process to accurately identify the root causes of leaks.
Inspect window hinges for aging or sagging, check waterproof sealant edges for gaps, and test window sealing performance to pinpoint leakage locations.
Conduct a comprehensive examination of the aluminium window frame to ensure it is level, ruling out deformation, distortion, or structural fatigue.
Focus on the connection between the aluminium window and concrete wall, checking for cracks, seepage signs, or structural loosening.
Integrate on-site inspection data with professional analysis to formulate the most suitable repair solution and provide detailed quotation discussion with the client.
For aluminium window seepage problems, EJW provides comprehensive and professional repair services. We prioritise scientific repair solutions, including hinge adjustment, replacement of weatherproof sealant strips, repair of structural joints, and application of high-performance Sika structural sealant to ensure long-lasting and reliable waterproofing performance, restoring a dry and comfortable home environment.
We only recommend full window replacement in cases of severe frame deformation or structural damage. EJW always considers the most cost-effective and durable solutions for our clients and avoids unnecessary replacements.
For more details on aluminium window replacement services, please visit EJW Aluminium Window Replacement Page.
Sika RainTite is a high-performance, UV-resistant liquid waterproof membrane designed for long-term outdoor protection. Featuring excellent elasticity, it effectively bridges hairline cracks to create a seamless, durable barrier against water ingress.
When applied with reinforcement fabric, it significantly enhances structural integrity at joints. Sika RainTite is the ideal, professional-grade solution for lasting building maintenance and moisture control.
Not necessarily. Leakage causes are often complex. Apart from aged sealant, issues such as inaccurate hinge installation, sagging hinges, or damaged operating handles can all affect sealing performance. EJW conducts a thorough inspection to identify the real root cause rather than blindly replacing the sealant.
Due to the hidden nature of many leakage problems, it is difficult to make an accurate assessment from photos alone. To ensure pricing transparency and solution accuracy, we insist on on-site inspection before providing the final quotation. This avoids any unexpected additional costs caused by misjudgement.
In most cases, full window replacement is not required. Through professional hinge adjustment, sealant strip repair, and re-sealing of structural joints, the majority of seepage issues can be effectively resolved. We only recommend full replacement when the window frame has severe deformation or structural damage.
In strong wind and high-salt environments, materials age faster. For such units, we use higher-grade weatherproof materials and special construction techniques to ensure the waterproof barrier remains solid under extreme weather conditions.
We use high-performance Sika materials combined with professional workmanship. Most repair works provide long-lasting waterproof performance. We will tailor a suitable long-term warranty according to the actual site conditions.
Core Advantages – Why Property Owners Recommend EJW
Aluminium window waterproofing is critical to home safety and structural longevity. EJW refuses any form of cutting corners and is committed to delivering reliable aluminium window repair services through professional craftsmanship and honest pricing. The following six key advantages represent our professional commitment to every client:
Strict compliance with building regulations and guidelines to eliminate any risk of unauthorised alterations.
HK$20 million comprehensive insurance and proper submission to building management, ensuring worry-free construction.
Skilled and seasoned technicians ensure structural stability and precision installation.
Use of 304 stainless steel and Sika professional waterproof technology, resistant to harsh weather.
All-inclusive quotations covering dismantling and cleaning with no hidden charges.
We are confident in our workmanship and provide a five-year warranty for lasting protection.
Eligible owners (such as seniors or those in need) can receive up to $80,000 in renovation subsidies from the Urban Renewal Authority for aluminium window waterproofing or repair works. EJW provides one-stop document assistance to help you apply easily and complete the project with peace of mind.
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