There are some characteristics that are common to each category: solid wood is more frequently site-finished, is always in a plank format, is generally thicker than engineered wood, and is usually installed by nailing. Engineered wood is more frequently pre-finished, has bevelled edges, is very rarely site-finished, and is installed with glue or as a floating installation. 
Another common hardwood floor malady is the development of gaps between planks. The most common causes of gaps between the boards is Mother Nature. Wood shrinks as it dries out, and it expands when it gets wet and humid. That regular expansion and contraction over time is the most common cause of gaps, and is the main reason why most gaps are seasonal in nature. Perhaps your best plan of action is to exercise patience.
Floating installation: A floating installation is where the flooring is laid down in a glueless manner on top of a layer of underlay. The individual planks are locked together, and are not glued or nailed down to the subfloor. By doing this the floor is floating above the underlay, and can be laid on top of existing tile or marble, without the risk of damaging the subflooring. Denver Hardwood Flooring
Installing a hardwood floor yourself can save you money – if you know what you’re doing. Improper preparation and installation can lead to warping and buckling, which will ruin flooring that would otherwise remain beautiful for years to come. The most important thing you can do to ensure the structural integrity of your floor is to properly prepare for the installation process. Here are various articles to help you!
It can be sanded down and refinished five, six, even seven times. And, if maintained properly, you won’t have to do it for 20 years. Refinishing a floor may be messy and troublesome, but most homeowners learn to live with it. After all, it costs five times as much to replace hardwood floors than it does to refinish them. For some people that is reason enough. Denver Hardwood Floor Install
Generally, hardwood floors need to be buffed every 3–5 years. The process usually takes about one day. Buffing refers to the process of using a stand up floor buffer. The floor is abraded with 180 grit screen on the buffer. This allows for the new coat of finish to mechanically adhere to the floor. This process works with great results as long as the floor hasn't had any waxes or synthetic cleaners. Denver Hardwood Floors
Engineered wood flooring has other benefits beyond dimensional stability and universal use. Patented installation systems allow for faster installation and easy replacement of boards. Engineered wood also allows for a floating installation where the planks are not adhered to the subfloor or to each other, further increasing ease of repair and reducing installation time. Engineered flooring is also suitable for underfloor and radiant heating systems. Denver Hardwood Flooring
Lowe’s has what you need to bring value-adding beauty to your home with hardwood flooring. There are plenty of species to choose from, including acacia wood flooring, walnut flooring, maple flooring, hickory hardwood flooring and cherry wood flooring. Depending on your budget and room’s traffic level, you’ll be sure to find a style to suit your needs. Denver Hardwood Flooring
Besides major problems, you may also experience scratching or loose planks with your hardwood flooring. Scratches can be repaired with touch up kits, or something as simple as a like colored crayon. If you’ve got serious scratching, however, you may need to hire a contractor to refinish the flooring altogether. And if you’ve got loose planks, your only solution is to tie them down. Ideally they should be nailed to the subfloor to prevent any more movement, though excessively loose boards can be a sign of improper installation in the first place. Bringing in a professional hardwood installer to re-install your flooring properly is probably the only sure way to permanently solve the problem.
The natural process of things will tend to close gaps as the weather and humidity changes. As a rule, if the gap is less than the thickness of a dime, your flooring is normal and there’s nothing to worry about. If your gaps are more persistent, you might need to call in a professional to tighten up your hardwood floor so that they cease to be a problem.
Refinish, refinish, refinish! In almost every case it is preferable to refinish rather than replace hardwood floors. Part of the appeal of hardwood is that it lasts so long. A quality hardwood floor can be sanded down and refinished at least six times, and up to ten times before you need to replace it. You can change the color, closely match and replace warped, stained, or termite ingested planks, silence squeaky boards, and fill gaps or patch knots. With all of these easy solutions, why would anyone choose to replace hardwood floors? Well, here are the cases when a complete rehaul becomes a better option.
Tongue-and-groove: One side and one end of the plank have a groove, the other side and end have a tongue (protruding wood along an edge's center). The tongue and groove fit snugly together, thus joining or aligning the planks, and are not visible once joined. Tongue-and-groove flooring can be installed by glue-down (both engineered and solid), floating (mostly engineered only), or nail-down (not recommended for most engineered). Denver Hardwood Flooring