You cannot restore every wood floor by simply refinishing it. If your wood floor has become warped or if several of the planks have become damaged, you will typically need to replace the entire floor, as finishing will only brighten an already-damaged surface. On really old floors, you may see the tongue where the boards come together, or your boards may lack adequate thickness. Floors like this are definite candidates for replacement, as refinishing is purely cosmetic.

Put on gloves, knee pads, and protective eye glasses. You'll be working diligently on your hands and knees for hours to complete this project, especially if you're doing a large space. Invest in a good pair of knee pads to protect your knees. Sturdy work gloves will protect your hands from splinters, and goggles will prevent sawdust and other debris from getting into your eyes.[1] Denver Hardwood Floor
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Although hardwood floors are amazingly beautiful and durable, they are not indestructible. The best floor maintenance plan for hardwood floors include regular vacuuming or sweeping with a soft bristle broom, especially in high traffic areas. Removing dirt or grit from your floors will reduce scratches. Vacuums with rotary brush heads can also scratch your floors.
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. Hardwood Floor
Instead of boiling the hardwood logs, in this process they are kept at a low humidity level and dried slowly to draw moisture from the inside of the wood cells. The logs are then sawn in the same manner as for solid hardwood planks. This style of engineered hardwood has the same look as solid hardwood, and does not have any of the potential problems of "face checking" that rotary-peel and slice-peel products have, because the product is not exposed to added moisture.
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. Denver Hardwood Floor Install
Although hardwood floors are amazingly beautiful and durable, they are not indestructible. The best floor maintenance plan for hardwood floors include regular vacuuming or sweeping with a soft bristle broom, especially in high traffic areas. Removing dirt or grit from your floors will reduce scratches. Vacuums with rotary brush heads can also scratch your floors. Denver Hardwood Flooring
Check the flatness of the subfloor. Use a straight piece of lumber that is between 8 and 10 feet in length to find any areas of the subfloor that aren't level. Simply lay down the plank and look for dips beneath it or raised humps. Mark any problem spots you find. Move the plank across the floor 1 way, then turn it diagonally and go across the surface again.[6]

The age of your floor also plays a role. If your floor has been in place for decades, it may resist refinishing for a number of reasons. For instance, if it has already been refinished several times or if too much of the surface wood has become exposed, refinishing your floor may have little effect. For very old floors, replacement can often be preferable to refinishing. Denver Hardwood Flooring
Wood flooring is any product manufactured from timber that is designed for use as flooring, either structural or aesthetic. Wood is a common choice as a flooring material and can come in various styles, colors, cuts, and species. Bamboo flooring is often considered a form of wood flooring, although it is made from a grass (bamboo) rather than a timber.[1] Denver Hardwood Flooring

If you get a second opinion and they can’t be refinished, then your best option will be replace them…or wait until you can replace them. Given when the house was built I’m doubting the floors are even, so putting a floating on top will be a really bad option as they will wobble. And, installing wood on top of thin wood is a really bad solution. If your foundation is weak, your floor will be weak and it will creak and separate. Denver Hardwood Floor Install

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.[7] Hardwood Floor

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