Caring for Marble and Stone Floors in Hong Kong Homes
Natural stone flooring — particularly marble, granite, and travertine — has long been popular in Hong Kong residences, from luxury apartments in Mid-Levels to village houses in the New Territories. However, natural stone is far more demanding than ceramic tiles or vinyl. Without proper care, marble loses its lustre, develops etch marks from acidic spills, and accumulates ground-in dirt that makes it look permanently dull.
Understanding Your Stone
- Marble (雲石) — A calcium-based stone that is relatively soft and porous. Highly susceptible to acid etching from lemon juice, vinegar, cola, and common cleaning products. Popular varieties in Hong Kong include Italian Calacatta, Spanish Crema Marfil, and Chinese Guangxi White.
- Granite (花崗岩) — Much harder and more stain-resistant than marble. Less prone to acid etching. Common in kitchen countertops and outdoor areas.
- Travertine (洞石) — A limestone with characteristic small holes and warm, earthy tones. Popular for feature walls and bathroom floors. Requires filling of natural voids and regular sealing.
Daily Maintenance
- Dust mop daily — Use a dry microfibre mop to pick up grit and sand. These abrasive particles are the primary cause of surface scratches. In Hong Kong, where shoes are removed at the door, dust from open windows and nearby construction is the main culprit.
- Clean spills immediately — Acidic liquids like fruit juice, soy sauce, and Chinese tea can etch the surface within minutes. Blot with a paper towel — never wipe, which spreads the liquid.
- Use pH-neutral cleaners only — Never use vinegar, bleach, or ammonia-based products on natural stone. Use stone-specific cleaners (pH 7–10) from brands like LTP, Lithofin, or HG, available at Hong Kong specialty hardware stores.
- Avoid excess water — Wring the mop until just damp. Standing water penetrates pores and leaves watermarks, especially during Hong Kong's humid season.
Dealing with Common Stains
- Tea and soy sauce — Apply a poultice of baking soda and water, cover with cling film, and leave 24 hours. The poultice draws the stain out. Repeat if necessary.
- Rust stains — Common near balcony doors where metal fittings corrode. Use a rust remover formulated specifically for natural stone — never general products containing hydrochloric acid.
- Etch marks — These are chemical damage, not stains. Light marks can be buffed with marble polishing powder. Deeper etching requires professional re-polishing.
- Oil and grease — Apply a poultice of baking soda mixed with acetone. The acetone dissolves oil while the baking soda absorbs it from the pores.
Professional Polishing and Crystallisation
Even with meticulous care, marble floors gradually lose shine from foot traffic and micro-scratches. Professional restoration is typically needed every 3–5 years. The process involves:
- Grinding — Diamond-embedded pads remove the damaged surface layer, eliminating deep scratches and uneven lippage between tiles. Only needed for significantly damaged floors.
- Honing — Progressive grits from 200 to 3000 create a smooth, even surface.
- Polishing — Finer pads restore the stone's natural reflective sheen to a mirror-like finish.
- Crystallisation (晶面處理) — A crystallising compound is worked into the surface with a steel wool pad. Heat and friction cause a chemical reaction that hardens and glosses the stone. This is the most popular finishing treatment in Hong Kong.
For a typical 500 sq ft Hong Kong flat, professional polishing and crystallisation costs HK$8–15 per square foot, totalling HK$4,000–7,500. The work takes one full day.
Sealing Your Stone Floors
A quality impregnating sealer penetrates the stone's pores and creates an invisible barrier against stains and moisture without changing the appearance. In Hong Kong's humid climate, sealing prevents efflorescence — white mineral deposits on the surface. Apply every 1–2 years. Test by placing drops of water on the surface; if absorbed within 5 minutes, it is time to reseal.
Avoid topical sealers that sit on the surface — they become slippery when wet and tend to peel and yellow. Stick with penetrating sealers from reputable brands.