We had bought and installed this beautiful product in our downstairs a few years ago. It's now time to do the upstairs and the product was the same excellent value for the price. Arrived quicker than we needed, but gives it time to acclimate to our home. We will be using the same installer and he was happy we are ordering the same product from the same company. He was VERY impressed by the quality of the product last time. I'm excited to see the completed project as I love this wood on our main floor.
Eliminate any problem spots to make the subfloor level. Sand minor humps down with a hand-held or orbital sander to make the subfloor level. To fill any dips or low spots, use a leveling compound (also known as floor patch). Mix up the compound according to package directions, fill in the dips, then pull your straight piece of lumber back and forth over the spot to flatten and level it with the rest of the subfloor. Denver Hardwood Floors
Hardwood floors can last a long time, but eventually they need to be replaced. Luckily, it's a pretty straightforward process! Use a circular saw to cut the old hardwood into pieces, then remove the old flooring. Prepare your subflooring so that it's clean and perfectly level. After that, choose your replacement flooring and follow the process for installing that particular type of hardwood!
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. 
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.
Most floors use a tongue-and-groove design for connecting adjacent strips. This design makes replacing a single strip or plank challenging, but not impossible. First, look for any nails in the damaged board and drive them as far through the board as possible by using a hammer and nail set. Carpenters use nail sets to drive nails flush with trim without damaging the trim with a hammer. After you’ve cleared the nails, it’s time to remove the damaged board and install a new one. Follow these steps: Hardwood Floors