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Sika Sikagard-300
Vendor:Sika 西卡 -
Sika Sikalastic 702
Vendor:Sika 西卡 -
Sika Sikaproof Membrane 1000
Vendor:Sika 西卡 -
Sika Ronacrete Monoprufe RTU 801
Vendor:Sika Ronacrete 西卡永聯結 -
Sika Ronacrete PU 55
Vendor:Sika Ronacrete 西卡永聯結
Roof elastic waterproofing membranes are liquid-applied coatings made from polyurethane (PU) or acrylic polymers that cure into seamless elastic films. Elongation can exceed 1000%, accommodating thermal expansion and contraction without cracking. Cold-applied for safe, simple installation — suitable for rooftops, terraces, balconies and exterior walls.
How to Choose a Roof Waterproofing Membrane?
Select based on application area and exposure conditions:
- Exposed rooftop (no protective layer) → Choose UV-resistant formulas, e.g. Sika Sikalastic 680, Hyperdesmo Classic, Mapei Aquaflex Roof
- Under tiles or screed → Non-exposed types, e.g. Hyperdesmo S-WR (low VOC, non-hazardous), Daivaproof 340
- Exterior walls or vertical surfaces → Non-sag formulas, e.g. Sika Ronacrete Monoprufe RTU 801, Fosroc Nitoproof 800
- Large area spray application → Airless spray compatible, e.g. Hyperdesmo 300, Polybit Polythane P
- Primer / adhesion promoter → Use with dedicated primers, e.g. Alchimica Universal Primer 2K-4060, Fosroc Nitoproof 600PF (primer)
Brands Available
Wah Hing supplies Sika, Alchimica (Hyperdesmo series), Fosroc (Nitoproof series), Mapei, Daivaproof, Polybit, and PFC roof waterproofing membranes and primers. Most products typically in stock; WhatsApp us for availability and delivery.
FAQ
What is the difference between elastic membrane and cement-based waterproofing?
Elastic membranes can stretch with the substrate, with elongation typically exceeding 300% or even 1000%, preventing cracks from thermal movement. Traditional cement-based waterproofing is rigid and prone to cracking under the large temperature differentials found on rooftops.
Can I apply roof waterproofing membrane myself?
Liquid membranes are cold-applied by roller or brush, making them relatively straightforward. However, surface preparation (cleaning, crack repair, priming) significantly affects performance. Refer to product technical data sheets or consult relevant professionals.
How often does roof waterproofing need to be redone?
Membrane lifespan depends on product type, application quality and environmental conditions. Quality PU membranes can last 10–15 years. Annual inspection is recommended; repair promptly if you notice ageing, blistering or localised damage.
Where to buy roof waterproofing materials?
Wah Hing Construction Waterproofing Materials is located on Canton Road, Mong Kok. Browse our website or WhatsApp us for product details, pricing and delivery arrangements.
