Natural Stone in Interiors
Natural stone in interiors means cladding walls, floors, staircases, bathrooms, window sills and worktops with slabs of marble, granite, travertine, onyx, limestone and other stones. Stone is chosen for a texture no imitation can reproduce, for its durability and because, with proper care, it keeps its appearance for years.
The main selection criterion is not colour but the service conditions of a specific area: floor abrasion, humidity, contact with acids (wine, lemon, household chemicals), load on the steps. The stone type, slab thickness and surface finish are chosen to match these conditions. Marble and onyx are decorative, granite is resistant, travertine and limestone give a warm matt texture.
The topic is relevant to architects and designers of public interiors (lobbies, halls, hotels), developers of premium residential complexes and owners of private houses. A general overview of stones and applications is in the section Natural stone for facades and interiors.
Applications
Indoors, stone plays the same roles as on a facade, but the requirements shift: frost resistance hardly matters, while abrasion resistance, stain resistance and behaviour in humid conditions come to the fore. Typical areas of use:
• Floors in halls, corridors, living rooms and entrance areas: granite, dense marble, quartzite, travertine with filled pores.
• Walls and feature panels: marble, onyx (including backlit onyx), travertine, limestone, sandstone.
• Staircases: treads, risers, landings, skirtings.
• Bathrooms and spa areas: walls, floors, vanity tops, shower trays.
• Small elements: window sills, fireplaces, bar counters, thresholds.
In public buildings stone is chosen for heavy foot traffic: marble that would last decades in an apartment can wear noticeably in a hotel lobby within a few years. That is why granite or hard varieties of marble are usually chosen for high-traffic areas, and soft stones are kept for walls.
Walls and floors
Walls have the fewest restrictions: the load is minimal, so soft stones also work: limestone, shell limestone, sandstone, travertine, onyx. Wall cladding slabs are usually 10–20 mm thick; they are bonded with stone adhesive to a prepared substrate, and large, heavy slabs are additionally secured with mechanical anchors. Light marble and onyx are laid on white adhesive: grey cement-based mortar can show through translucent stone as stains.
Three parameters matter for floors: abrasion resistance, flexural strength and slip resistance. Guidance by stone type:
| Stone | Floors | Walls | Comment |
|---|---|---|---|
| Granite, basalt | Yes, including high-traffic areas | Yes | Most resistant to abrasion and stains |
| Marble | Yes, depending on traffic | Yes | Sensitive to acids; polished floors become matt over time |
| Travertine | Yes, with filled pores | Yes | Warm matt texture, needs impregnation |
| Onyx | Limited | Yes, including backlit | Brittle, expensive, mostly a feature material |
| Limestone, sandstone, shell limestone | Limited, in residential rooms | Yes | Porous, soft, need protection |
Exact abrasion and strength values depend on the quarry; they are taken from the batch certificate or test report. For wet and entrance areas the surface is honed, flamed or brushed rather than polished, which reduces slipperiness.
Staircases
A staircase is the most heavily loaded part of a stone interior: treads wear in the centre, edges take impacts, and a slippery surface becomes a safety issue. That is why treads are usually made of granite or dense marble 30 mm thick or more, while risers are thinner, 20 mm, as they carry no load.
Practical solutions for stone staircases:
• anti-slip grooves or inserts near the tread nosing, or a matt finish over the whole surface;
• rounded or chamfered edges chip less than sharp ones;
• slabs from one batch and one block, so that the pattern does not jump between adjacent steps;
• layout of landings and steps on a drawing before cutting, especially for marble with pronounced veining;
• installation on a rigid base without voids: a void under a tread eventually leads to a crack.
Outdoor entrance steps also require frost resistance and low water absorption, so flamed granite is justified there.
Bathrooms
A bathroom is an environment with constant moisture, temperature changes and household chemicals. Stone works here, but the choice of stone and protection is more critical than in dry rooms.
• Granite: practically no restrictions: floors, walls, vanity tops, shower trays.
• Marble: popular for walls and vanity tops, but acidic cleaners and limescale leave matt marks. Impregnation and neutral cleaning products are needed.
• Travertine: suitable if the pores are filled and the stone is water-repellent treated; open pores collect dirt and soap scum.
• Onyx: striking as a feature wall, but in a wet area it requires particularly careful maintenance.
In shower areas stone is laid only over waterproofing, with joints in flexible water-resistant grout and the floor sloped towards the drain. Matt, brushed or textured surfaces are chosen for shower floors. Light marbles on cement adhesives sometimes yellow or stain from moisture in the substrate, so special adhesives for natural stone are used.
Care
Caring for interior stone comes down to three rules: protect the pores, do not etch the surface and remove abrasive dirt promptly.
1. Impregnation after installation. Porous stones (travertine, limestone, sandstone, marble) are treated with a water- and oil-repellent impregnator. It is reapplied as it wears off: more often on high-traffic floors, less often on walls.
2. Neutral products. Acidic products (descalers, bathroom cleaners, vinegar) dissolve carbonate stones: marble, travertine, limestone, onyx. Only pH-neutral cleaners for natural stone should be used on them.
3. Protection from sand. Sand on shoe soles acts as an abrasive. Entrance mats extend the life of a polish more than any chemical.
4. Prompt stain removal. Wine, coffee and oil should be wiped up immediately, before they soak in.
5. Restoration. Worn polish is restored by grinding and polishing on site; with natural stone this can be done many times, unlike coatings and ceramics.
The specific product and treatment frequency depend on the stone and the area; more on products in a separate article on stone protection.
Examples from TECHNOFORMA projects
TECHNOFORMA's core business is facades: GFRC (glass fibre reinforced concrete), natural stone and porcelain stoneware on rainscreen systems. The company does not publish completed interior projects on its website, so there is no interior case study to show here. For interiors the company supplies the same range of stones as for facades: marble, granite, onyx, travertine, limestone, dolomite, sandstone, shell limestone, basalt, from its warehouse in the Moscow region (stock from India, Turkey, China and Iran) or to order from other quarries. The equipment processes both soft and hard stones, and the design team prepares layouts and 3D visualisations before purchase.
Stone work on a facade can be seen at the Dinastiya club house in Kislovodsk: in addition to GFRC, 700 m² of granite was installed there. Other projects are in the TECHNOFORMA projects section. To learn how to preserve the look of stone indoors, read Natural stone protection: water repellents and impregnators.
FAQ
Which stone is best for a hallway floor?
For entrance areas exposed to sand and moisture, granite or dense marble with a matt, honed or flamed finish is best. Polished soft stone at the entrance quickly loses its shine.
Is travertine suitable for wall cladding?
Yes, travertine is one of the most common stones for interior walls. The pores are filled with mastic or resin, and after installation the surface is impregnated, especially in wet rooms.
Can flexible travertine veneer be used for interior walls?
Flexible stone is a thin layer of stone particles or a stone slice on a fabric or polymer backing. It suits curved surfaces and lightweight partitions, but differs from a solid slab in texture and wear resistance. TECHNOFORMA works with natural stone slabs.
How does interior stone wall cladding differ from facade cladding?
Indoors there is no need for frost resistance and almost no wind load, so thin slabs, soft stones and adhesive fixing are acceptable. On a facade, natural stone is selected for frost resistance and water absorption and installed on a ventilated rainscreen substructure with mechanical fixings.
Does interior stone need impregnation?
Porous stones (travertine, limestone, marble, sandstone) do, especially on floors, in kitchens and bathrooms. Dense granite is impregnated less often, mainly to protect against oil stains.