All Category

Complete Guide on Waterproofing Your Home

For any home constructed using concrete, steel and cement, waterproofing is one of the important processes that has to be done during the construction phase. Waterproofing is done, to prevent damage to the interiors of the house from water seepage. Using the right kind of waterproofing chemical is as important as the process itself. Some of the common problems, such as water seepage problems during the monsoon, water in the terrace, etc., occur due to lack of waterproofing or usage of poor materials or absence of waterproof paints. To help you avoid such situations, here are a few things that you should understand about waterproofing.

What is roof waterproofing?

In simple words, roof waterproofing is basically adding an extra layer of protection on your roof which prevents water from leaking into your home. Roof waterproofing is extremely important when it comes to preserving the quality and longevity of your living space, and the consequences of not fixing a leaking roof can be very severe.

A guide to waterproofing your home

How Severe Are the Consequences of Not Waterproofing Your Roof?

Failing to waterproof your roof leads to more than just unsightly moldy walls and water stains, which are already challenging to manage. Not waterproofing exposes your home to water leaks that can significantly jeopardize the safety and health of your household.

Significantly Affects the Structural Integrity of Your Roof

According to SERVPRO of Providence, the imagery of fear that comes with water damage is justified, as insufficient roof waterproofing can cause lasting structural harm. This issue is particularly acute in Singapore due to its high rainfall, which results in deterioration of roofing materials. Additionally, trapped moisture can promote mold and mildew growth, further weakening the structure. In the humid and hot climate of Singapore, this combination exacerbates roof damage and potential leaks.

Greatly Increases the Risk of Mosquito-Borne Diseases

As cited from Pexels, water entering your home can lead to the accumulation of stagnant water in hidden areas, creating breeding sites for mosquitoes. This situation significantly heightens the likelihood of diseases spread by mosquitoes, such as malaria and dengue, which are prevalent in Singapore.

Raises the Likelihood of Allergies in Family Members

Also sourced from Pexels, excess moisture indoors can encourage the growth of mold, which is not only unpleasant to look at but can also trigger allergies. Mold spores, a well-known allergen, can cause symptoms ranging from nasal congestion to severe asthma attacks when they come into contact with skin or are inhaled.

Neglecting roof waterproofing is a risk that can and should be mitigated, particularly given the relatively low cost of implementing waterproofing measures to protect your home and family.

Advantages of Waterproofing

  • Waterproofing prevents unwanted moisture from seeping into your walls.
  • It prevents damage caused due to seepage which may ruin the structural strength of the house.
  • Seeping moisture and water can cause metals to rust and wood to decay. Waterproofing methods can avoid such damages.
  • Foundation waterproofing prevents the foundation from getting weak, improving the value of your house in the market.

Common Methods & Materials for Roof Waterproofing

Liquid Applied Membrane

Typically used for: Tiled roofs

liquid applied membrane

Liquid applied membranes are favored for roofing, particularly on tiled surfaces, due to their ability to seamlessly cover all areas, reaching every nook and cranny. It is critical, however, to hire a professional roofing contractor for application to avoid issues such as tearing from overly thin membranes.

Cementitious Waterproofing

Typically used for: Concrete/Tiled Roofs

roof waterproofing tile

This method involves coating the roof with a mix of cement and acrylic materials, providing effective waterproofing. While cost-effective and straightforward to apply, cementitious waterproofing can be prone to cracking because it is primarily cement-based.

Polyurethane Liquid Membrane (PU)

Typically used for: Flat roofs

Polyurethane Liquid Membrane (PU)

Highly resistant to stagnant water, polyurethane liquid membranes are ideal for flat roofs, filling capillary cracks for a longer service life of up to 25 years. This method tends to be more costly but offers extensive waterproofing coverage.

Bituminous Coating Waterproofing

Typically used for: Metal/Concrete roofs

Bituminous Coating Waterproofing

Also known as asphalt coating, this method uses bitumen-based solutions enhanced with polymers such as polyurethane or acrylic to improve flexibility and durability. Although highly resistant to UV rays and corrosion, its environmental impact is a concern since it is derived from crude oil.

EPDM Rubber

Typically used for: Flat Roofs

EPDM Rubber

EPDM rubber, a synthetic membrane, is popular for its durability and flexibility, especially on low-sloped flat roofs. Its application involves a bonding adhesive, making it a safe choice that is also resistant to extreme weather conditions, though it may lack aesthetic appeal.

PVC Waterproofing Membrane

Typically used for: Flat roofs

PVC Waterproofing Membrane

PVC membranes are single-ply and vapor permeable, effective against moisture build-up. Reinforced with materials like polyester mesh or glass fibre, they provide robust protection for roofing.


Typically used for: Commercial/Industrial roofs


Although expensive, thermoplastic offers a substantial working life of 50 years, positioning it as one of the most enduring waterproofing materials available. Typically, it is reserved for commercial or industrial roofing due to its suitability in environments where the roof may encounter contaminants such as grease, or where conditions are too harsh for single ply-membranes like EPDM or PVC to perform effectively.

Best Roof Waterproofing Company in Singapore

Experience top-notch protection with LeFong’s Roof Waterproofing Services! Our expert team uses advanced materials and techniques to shield your home or business from water damage. Whether it’s intense rainfall or daily moisture exposure, we provide durable and effective solutions tailored to your needs. Don’t wait for leaks to appear; safeguard your property today with LeFong and ensure peace of mind for years to come.

Contact us now to schedule a consultation and discover how our waterproofing services can extend the life of your roof

FAQ on Roof Waterproofing

What is roof waterproofing?

Roof waterproofing involves applying a protective layer over your roof to prevent water from penetrating the building, utilizing materials like membranes and coatings.

Why is waterproofing important for my roof?

Waterproofing protects the structural integrity of your roof, preventing water damage, mold growth, and extending the lifespan of your building.

What are the common materials used for roof waterproofing?

Materials include liquid applied membranes, cementitious waterproofing, polyurethane, bituminous coating, EPDM rubber, PVC membranes, and thermoplastics.

How often should I waterproof my roof?

Inspect and potentially update your roof’s waterproofing every 5 to 10 years, or if signs of damage like leaks or stains are observed.

What are the signs that my roof needs waterproofing?

Signs include visible leaks, water stains, mold growth, and damaged roofing materials, indicating the need for maintenance or new waterproofing.

Can I waterproof my roof myself?

While DIY is possible for simple applications, complex systems and materials typically require professional installation for safety and effectiveness.

How much does roof waterproofing cost?

Costs vary widely based on roof size, materials, and application complexity, ranging from a few hundred to several thousand dollars.

What is the best time of year to waterproof a roof?

Waterproof during dry conditions, typically late spring to early fall, to ensure proper curing and adhesion of the waterproofing material.