Timber product is available in the form of strips, boards, or panels that look like boards. It can be nailed but is usually installed as a floating floor. This means that the pieces glued to each other, but not attached to the sub-floor. This allows the floor to "lift" with seasonal weather changes or humidity changes.
Almost all engineered pre-finished wood flooring, and usually come with a V groove mentioned earlier. Some cannot be refinished because it was a too thin surface finished. Others can once or twice. If you are searching for custom timber then you can visit various online sources.
It depends on the top layer, which can be anything from 1/12 "to 1/4" depending on the manufacturer. In the end, it costs about as much floor solid wood floor, and the only advantage (in my opinion) is that you can "lift" on the concrete.
Over the past few years, many manufacturers have incorporated exotic woods flooring in line to meet their popularity. Some of these exotic looks were even available in laminate flooring. In solid boards, exotic woods can cost double the comparable domestic species, although it remains close to the forest engineered hardwood in the country.
The appeal of these species is often in rich colors and durability. Many are much harder than oak or maple. Several tropical forests have been recognized as environmentally friendly because of their rapid growth rate. Fastest themselves replenishes are bamboo and cork (not wood).
If you care about the environment, look for the FSC stamp on the product you're purchasing. The Forest Stewardship Council is an environmental group that keeps track of timber production and forest declared harvested in an environmentally friendly way.