What's the difference between cultured stone and GenStone?

GenStone is a polyurethane foam product with a stone-textured surface. Cultured stone —...#

GenStone is a polyurethane foam product with a stone-textured surface. Cultured stone — what we make at RSV — is real cast concrete with mineral pigments mixed throughout. Both look like stone from 10 feet away. The differences show up in weight, durability, fire resistance, and price.

Quick comparison on the dimensions that actually matter:

What it's made of.
GenStone: high-density polyurethane foam with a printed/molded stone-textured face. Lightweight, panelized.
Cultured stone (RSV): cast concrete with iron-oxide mineral pigments, formed in molds taken from real quarried stone.

Weight.
GenStone: ~1.5 lbs per square foot.
Cultured stone: 8–12 lbs per square foot.
Both are light enough to install over wood framing without structural footings, but GenStone is dramatically lighter.

Fire resistance.
GenStone: not fire-rated. Cannot be used near fireplaces, fire pits, or heat sources.
Cultured stone: non-combustible, ASTM E84 Class A. Approved for fireplace surrounds and any heat-adjacent application.

Durability.
GenStone: 25-year warranty against fading and warping. Foam can be punctured by hard impacts.
Cultured stone: lifetime structural warranty. Iron-oxide pigments cannot fade. Concrete cannot be punctured by normal impact.

Install speed.
GenStone: fast — panels click together with hidden fasteners. 4×6 ft accent wall: ~3 hours.
Cultured stone: slower — requires mortar setting. Same wall: ~8–12 hours including prep.

Price.
GenStone: $9–$14 per square foot for the panels alone.
Cultured stone (RSV factory-direct): $5.39–$7.89 per square foot for flats. Lower material cost, higher install labor.

When GenStone makes sense: rental properties, basements with no fire exposure, accent walls where you want fast install and don't care about long-term durability.

When cultured stone makes sense: anything near fire (fireplaces, kitchens with stoves nearby), exterior walls (cultured stone handles freeze-thaw better), anything you want to last 50+ years, anything where buyers will scrutinize material quality (resale value).