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Buildings Department Registered Minor Works Contractor (MWC 23/2025)
All projects must have on-site supervision.
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Waterproofing Services | EJS

EJS Professional Window Sill and Balcony Waterproofing Services in Hong Kong - Solving rain-season leakage problems

EJS: Professional Window Sill and Balcony Waterproofing Services to Solve Rain-Season Leakage Problems

Are you worried about water seepage from window sills and balconies during the rainy season, causing indoor leaks, wall mold, or even affecting home safety and structural stability? In Hong Kong’s rainy and humid environment, waterproofing works are key to protecting your home.

Easy Job Solution Engineering Limited (EJS) has many years of local waterproofing experience in Hong Kong. Using the highest quality waterproof materials and professional construction techniques, we provide one-stop window sill and balcony waterproofing solutions. Whether for new or old buildings, we can build a strong and reliable waterproof barrier to keep your home dry and safe during the rainy season.

Choosing EJS means choosing the most reliable waterproof protection!
Our professional team uses exquisite craftsmanship and premium materials to build the strongest defense for your home.

Window Sill Waterproofing — Professional Five-Step Construction Process

Step 1: Preparation Works

Thoroughly clean the area around the window sill, remove all obstacles, and use waterproof cloth or tape to protect windows and surrounding areas to prevent damage or contamination during construction, providing a clean and tidy working environment for subsequent works.

EJS Window Sill Waterproofing Preparation Works - Thorough cleaning and protection of surrounding areas

Step 2: Removal of Damaged Concrete

Use professional tools to carefully break and remove loose or damaged concrete on the window sill until a solid base is exposed, thoroughly clearing all debris and dust to provide a stable foundation for the subsequent waterproof layer.

EJS Removal of Damaged Concrete on Window Sill - Breaking and clearing loose concrete

Step 3: Repair of Cracks and Gaps

Use high-quality polyurethane sealant to evenly fill all cracks and gaps, ensuring complete filling to block water penetration paths and solve leakage hazards from the source.

EJS Repair of Window Sill Cracks and Gaps - Filling cracks with polyurethane sealant

Step 4: Application of Waterproof Layer and Re-laying of Concrete

First apply primer to enhance adhesion, then evenly apply liquid waterproof membrane or waterproof slurry to fully cover all possible seepage areas. Afterwards, prepare and lay new concrete, smooth it with a trowel to ensure it is level with the surrounding original concrete, and finally perform adequate curing.

EJS Application of Waterproof Layer and Re-laying of Concrete on Window Sill - Primer, waterproof membrane and new concrete

Step 5: Final Treatment and Re-painting

Carefully inspect the repaired area to ensure nothing is missed; remove protective materials, thoroughly clean the site, and finally re-paint to make the window sill appearance beautiful and consistent, completing the waterproofing works.

EJS Window Sill Waterproofing Final Treatment and Re-painting - Final cleaning and painting after waterproofing

Balcony Waterproofing — Professional Three-Step Construction Process

Step 1: Application of Primer

Evenly apply primer to the reinforced concrete surface, not only cleaning the base but also greatly enhancing the adhesion between the waterproof material and the base. It is an indispensable intermediary layer for the entire waterproofing system.

EJS Balcony Waterproofing Primer Application - Even primer coating on balcony concrete surface

Step 2: Repair of Wall Corners and Cracks

The corners where walls meet concrete are the weakest points prone to gaps. We use high-quality joint filling materials to pre-strengthen and fill them in advance to eliminate future seepage risks.

EJS Balcony Wall Corner and Crack Repair - Strengthening weak points with joint filler

Step 3: Application of Oil-Based Polyurethane

Use a professional scraper to evenly apply high-performance oil-based polyurethane to the floor surface. During construction, strictly control thickness and avoid air bubbles to ensure a complete and seamless waterproof protective layer is formed.

EJS Balcony Oil-Based Polyurethane Application - High-performance polyurethane waterproof coating on balcony

Through our professional and precise construction steps, the waterproof performance of window sills and balconies is greatly improved, effectively preventing rainwater penetration and ensuring long-term structural stability and durability of the home.
Easy Job Solution Engineering Limited (EJS) keeps you worry-free during the rainy season.

Our professional team is ready to provide detailed quotations and on-site assessments to help keep your home free from water leakage problems.