Natural Stone and Concrete Admixtures: A Project Buyer's Guide

Building materials specification splits into two very different conversations: natural stone, which is chosen mostly on appearance and durability for visible surfaces, and concrete admixtures, which are chosen entirely on the technical problem they solve. Here's how to think through both.

Natural stone — matching the stone to the surface

Marble remains the default choice for interior facades, flooring, and feature walls where veining and color depth matter most — it comes in a wide range of looks, from the bold movement of a bookmatched slab to the uniform tone of something like Botticino Beige or Ivory Polished. Quartzite is harder and more resistant to scratching and etching than marble, which makes it worth considering for higher-traffic surfaces or countertops where marble's softness becomes a real maintenance concern over time.

For exterior facades specifically, durability against weathering matters more than it does indoors — confirm the stone's suitability for exterior exposure in your specific climate before finalizing a facade specification, since not every attractive interior stone performs the same way outdoors.

Concrete admixtures — each one solves one specific problem

Unlike stone, admixtures aren't a style choice — each type exists to solve a specific construction problem, and using the wrong one (or skipping one that's actually needed) shows up as a real defect later, not just a missed opportunity.

• Superplasticizers increase concrete's workability without adding water, which would otherwise weaken the mix — essential for complex formwork or dense reinforcement where the concrete needs to flow well.
• Microsilica admixtures increase density and reduce permeability, improving long-term durability and resistance to chemical attack — relevant for structures exposed to aggressive environments.
• Waterproofing coatings (facade or roof) are applied treatments rather than mixed into the concrete itself, and the right one depends on whether you're waterproofing a vertical facade or a roof deck — they're not interchangeable.
• Joint sealants and tile adhesives are finishing-stage products, but choosing the wrong grade for the expected movement or load at a joint is a common, avoidable source of later cracking.

The question that should come before the product list

Before specifying either stone or admixtures, get clear on the actual exposure conditions: interior or exterior, expected foot traffic or structural load, and the climate the finished project will sit in. Most material specification mistakes come from choosing based on appearance or price alone, without checking whether the material is actually rated for the conditions it'll face.

Browse NAD's stone and concrete admixture range, or share your project's exposure conditions and we'll help confirm the right specification.