Marmoleum Cinch Loc Seal Square - Oyster Mountain 12" x 12"

Marmoleum Cinch Loc Seal Oyster Mountain — 12" x 12" Click Linoleum Floor Square

Oyster Mountain is a Marmoleum Cinch Loc Seal linoleum floor square that measures 12" x 12" and locks together without adhesive. Its name suggests shell and stone while Forbo's data shows a deep warm grey, and the 9.8 mm build pairs a Marmoleum wear surface with an HDF core and cork underside.

Best for: bedrooms, laundry rooms and guest suites that call for a quiet, deep neutral.

The Look

The name combines oyster shell and mountain rock, pointing to a muted neutral, and Forbo's figures (NCS code S 6502-Y, light reflectance value 17%) put it firmly in deep-grey territory with a slight warmth. Forbo does not publish a written colour description for this square, and linoleum shades can shift slightly between batches, so look at a physical sample in daylight and lamplight before committing.

Why Choose Oyster Mountain

• Made from renewable ingredients: linseed oil, pine rosin and wood flour make up most of the surface.
• No glue on site: the click joint means no adhesive odor or open time to manage.
• Comfortable underfoot: cork on the back adds warmth and quiet, a plus in sleeping areas.
• Low-effort upkeep: regular dust mopping and an occasional damp mop are usually all it needs.

Installation

Store the unopened cartons in the room for at least 48 hours first. Forbo wants the space held at 75°F, give or take 10 degrees, with relative humidity near 50% for a week before, during and after the job. Over concrete or heated floors, put down a vapor barrier such as QuietWalk Versa or an equivalent.

Frequently Asked Questions

What colour is Oyster Mountain? A deep, muted grey, darker than the shell-and-stone name implies. Forbo gives no written colour description, so a free sample is the best way to judge it.

How long should Oyster Mountain acclimate? Forbo calls for at least 48 hours of acclimation, with the room at about 75°F (plus or minus 10°F) and 50% relative humidity (plus or minus 10%).

Is Oyster Mountain a good choice for a laundry room? It can be, as long as there is no flooding risk. Forbo says not to install where water problems exist, such as rooms with floor drains or sump pumps.

What is the Forbo color number for Oyster Mountain squares? The square is Forbo color 333421. Numbers starting with 33 are squares; panels use 93 numbers.

Product Specs

• Brand: Marmoleum (manufactured by Forbo)
• Collection: Marmoleum Cinch Loc Seal
• Color: Oyster Mountain (Forbo square color no. 333421)
• Forbo color data: NCS S 6502-Y, LRV 17%
• Format: Square, 12" x 12" nominal (300 mm x 300 mm / 11.81" x 11.81")
• Total thickness: 9.8 mm (0.39")
• Surface: Marmoleum linoleum with Topshield pro factory finish
• Base material: HDF core (described by Forbo as waterproof)
• Backing: cork
• Locking system: Välinge 5G glueless click
• Installation: Floating; above, on or below grade
• Vapor barrier: required over all concrete subfloors and any subfloor with underfloor heating
• Radiant heat: hydronic (water-heated) systems only; substrate surface max 85°F (29°C)
• Not recommended for stairs
• Carton: 7 squares, 6.78 sq ft, 14 lbs
• Warranty (Forbo US limited warranty): 25 years residential wear, 5 years light commercial wear; lifetime limited structure and lifetime limited waterproof coverage
• Documents (PDF): Installing Marmoleum Cinch Loc Seal (v1.25), Forbo Limited Warranty, Marmoleum Cinch Loc Seal, Cleaning and maintenance, Marmoleum: What is Ambering?

Design Pairing Guide

• Bedding: crisp white linens and oatmeal throws lift a deep grey floor.
• Furniture: pale oak or rattan pieces keep a bedroom airy.
• Paint: dove grey or a misty blue wall adds gentle contrast.
• Rugs: a low-pile wool rug layers texture without hiding the square pattern.

See more neutral options in the full Cinch Loc Seal square collection.