Engineered hardwood has made it possible to enjoy real wood flooring in places where traditional solid hardwood may not be the most practical choice — including homes built on concrete slabs and, in some cases, floors installed over radiant heat.

But there is one important difference homeowners often do not think about when purchasing engineered hardwood:

Not every engineered wood floor can be sanded and refinished.

It all comes down to the wear layer

Engineered hardwood is made in layers. The surface you see is real wood, but beneath it are additional layers designed to give the floor greater stability.

That top layer of real wood is called the wear layer.

Some engineered floors have a substantial enough wear layer to allow professional sanding and refinishing. Others have such a thin layer of real wood that sanding simply is not an option.

That can make some lower-cost engineered floors, in practical terms, almost like a throw-away wood floor. Once the original surface is badly worn or damaged, there may not be enough actual wood available to safely sand it.

A better-quality engineered floor, on the other hand, may have enough wear layer to give that floor another life.

How do you know if your engineered floor can be sanded?

There is no safe answer based simply on the fact that the floor is engineered hardwood.

A professional needs to evaluate several things:

• The thickness of the remaining wear layer

• Whether the floor has been sanded previously

• The condition and flatness of the floor

• Damage, deep scratches or water staining

• The construction and installation of the flooring

• How much material would need to be removed to achieve the desired result

If the manufacturer and original flooring specifications are available, they can also be very helpful.

Most importantly, this is not a floor where someone should simply start sanding and hope for the best.

Once an engineered floor is sanded through its usable wood layer, there is no fixing that mistake.

Who should sand an engineered hardwood floor?

This is one place where experience matters.

Sanding solid hardwood and sanding engineered hardwood are not necessarily the same proposition. With engineered flooring, the contractor may be working with a limited amount of usable wood.

The goal is not to remove as much material as possible.

The goal is to remove only what is necessary.

That means knowing the flooring, understanding the sanding equipment, recognizing how aggressively each machine cuts, and having enough experience to know when to stop.

A real-world example: engineered hardwood over radiant heat and a concrete slab

We recently refinished an engineered hardwood floor installed over a concrete slab with radiant heat beneath it.

The floor had scratches, blemishes, worn areas and a noticeable water mark. The homeowners wanted to know whether the floor could be restored rather than replaced.

Fortunately, the engineered flooring had enough usable wear layer remaining to allow refinishing.

Because preserving that layer was so important, our approach was deliberately conservative. Rather than aggressively removing wood, the objective was to take off the existing finish and damage while preserving as much of the engineered surface as possible.

The radiant heating system underneath the floor also meant the project required additional attention to the condition and stability of the wood throughout the refinishing process.

The result was a renewed hardwood floor without sacrificing more of the wear layer than necessary. 

Before you replace an engineered hardwood floor, ask

If your engineered hardwood has become scratched, worn, stained or tired-looking, replacement may not automatically be necessary.

The first question should be:

Does the floor have enough wear layer left to safely refinish it?

If the answer is yes, an experienced wood-floor professional may be able to give that engineered hardwood floor an entirely new life.

And if you are purchasing engineered flooring today, it is worth asking one more question before choosing solely by color and price:

How thick is the wear layer — and can this floor be refinished someday?

That answer could determine whether you are buying a floor for today or a floor that can still be renewed years from now.

See the project

Want to see an engineered hardwood floor that was successfully refinished over radiant heat on a concrete slab?  Check out this case study (it was an amazing success for our clients, done while they were on a cruise) …Engineered Wood Refinishing With Micron-Level Precision.