Wood vs. Engineered Wood? No contest in this case. If the home was built in 1905, put real hardwood in. This preserves the integrity of the home's building materials. Plus, as you can see from the age of these floors, higher grades (i.e. thicker) hardwood can be sanded several times; you usually don't get even one chance to sand engineered wood. The hardwood layer at the top of this multilayered product is simply too thin. Level Floors and Subfloors There are ways to level a subfloor, ranging from replacing parts of the subfloor with thicker or thinner sheets of plywood (or planks, see below), to pour-on leveling compounds that harden to make the entire floor level. What you use to level uneven areas depends on what the subflooring is. If it is plywood or concrete, the compound works. But more likely with this home, on floors at or above grade, there will be wood planks laid at a diagonal across the floor joists. So in your home, the layers were probably joists first, then subfloor planks of wood, then hardwood with tongue & groove joints. You cannot effectively use a pour-on leveling compound on a plank subfloor, as there are cracks between the planks. However, you can lay a new hardwood floor directly on a wood plank subfloor as long as those planks are sound and relatively level. Replace individual planks that have been damaged by water or insects, are otherwise compromised, or even missing (it happens!), with either new planks of lumber, or with plywood of the same thickness as the planks. Any lumber you install, for either the subfloor or finished flooring, should be brought in to your home several days prior to installation, so the materials acclimatize to your typical interior temperature and humidity. Unlike for ceramic or porcelain tile, the subfloor does not have to be perfectly level. And unlike vinyl sheeting, planks or tiles, the hardwood won't "telegraph" minor differences in height, and minor surface irregularities, so the subfloor doesn't have to be absolutely perfect; it should be sound, strong, uniform and essentially level. Your flooring contractor can give you specifics on what upgrades your subfloor may need once the original hardwood is removed. Joists If the floor is significantly not level in parts, or if certain areas feel spongy when you walk on them, I recommend you have your flooring contractor, a home inspector, or structural engineer inspect the subflooring and especially the floor joists. You don't want to invest in a new floor, only to have it become damaged because some joists weren't attended to. Transitions Transitions (a.k.a. thresholds or molding) between existing rooms and the new floor ought to be made of the same wood and same finish (stain, polyurethane, etc.) as the new flooring you are putting down. As wood ages, the finish becomes darker, so trying to make the transitions match the finishes of existing floors is very difficult and not recommended (what will match those floors right now won't match later after your transitions age up a bit). Eventually, the transitions wouldn't match either the new or the old floors! Transitions come in four types: reducer (when the two floors being joined are of different heights), seam binder (when the floors are the same height, and the boards from each are very close to one another), T-mold (when the two floors are the same height, but there is a crack between the two rooms' flooring) and stair nose or stair edger (when the flooring needs to curve around the front of a stair's "tread"--the flat part of a stair upon which you tread!). The transitions for your particular project can be ordered when you order the hardwood, so make sure to include measurements for those doorways/entrances. The contractor can tell you if he/she anticipates there will be a height difference or gap between the floorings, which would require those particular transitions. Dry Air Concerns Consult a local lumber supplier or flooring contractor familiar with your local climate conditions to discuss finishes or other tips for keeping your wood floors healthy in the dry winters. Sounds wonderful! Have fun!

My concern is the layers of vinyl underneath the hardwood. Hardwood doesn't like sitting on vinyl and vinyl doesn't like sitting on hardwood. The two do NOT like each other. If you think this is a good idea (which it is considered on the technical side of things a horrible approach to this) then you might have to add another layer of subfloor. A nice, fat, thick 1/2" plywood to cover those two layers of vinyl. Now you can go ahead and lay the hardwood. Technically, my suggestion is hideous. It is atrocious. It is so "unprofessional" that I could weep. But if you insist on leaving the vinyl in place, then you need to think of a way to separate the vinyl from the hardwood sitting on top....and one very sure way is with plywood. Again, my suggestion is a travesty. Then again so is laying hardwood over two layers of vinyl. In the flooring world, we 'allow' ONE layer of resistant flooring (like vinyl) to sit underneath another floor. For example: the first layer of vinyl was considered "OK" to lay another layer of vinyl over top. All good. No one in the technical department batted an eye. If a THIRD vinyl floor was proposed (or a laminate, or linoleum, or cork, or hardwood, or tile, or even carpet) it would be a "NOOOOOOOO! STOOOOOP! DON'T DO IT!" type of answer. So I will officially say: No. Stop. Don't do it. There. It has been said. That being said, if you as the homeowner choose to forgo the installation instructions and the "Best Practices" as set out by the National Wood Flooring Association (as homeowners your word is "law" when it comes to things like this), you are welcome to go ahead and lay hardwood over two layers of vinyl. If you do it, I suggest a new layer of plywood to help things along - because you need FLAT. And most "old hardwoods with two layers of vinyl sitting on them" are anything but flat. Good luck. You would be better off remediating the asbestos/vinyl and getting down to bare hardwood. Now a new floor (with the help of a layer of plywood) can go down. Or you remove the original hardwood with the vinyl (this is easier to do than scrape off the vinyl...and easier = cheaper) and start with a new layer of subfloor and go after it like it should be done. But as homeowner your word is "law". If you tell a professional to "just do it", they will say "yes ma'am/sir" and do it. But they will not warranty their work. You will be left holding the bag - and all the pit vipers that lay inside. It's your call.

Those "gaps" are mild. They are normal. They are expected. They tell the story that they are original. They are meant to be there. The new floors will eventually do that too...which means they will match (eventually). It might take a decade...but it will happen. And don't forget that once everything is sanded down, you will be VERY surprised at how those "gaps" seem to go away (visually). Why, you ask? Because some of that is dirt. Once the floor has been sanded down (1-2mm of wood is taken off with the sanding), the dark material between the planks gets shaved off as well. And voila...they look cleaner (because they are). Relax about the absolutely normal spacing between planks. Unless you have museum quality climate control, this LITTLE bit of shrinkage is normal and to be expected with every floor (especially if it is 30 years old).

I would find a way to send a sample of your existing floor to have it identified. This costs $100 and takes about a week to get the results. There are national labs that test wood species. That's where you start. Once you have the test results you compare it to the species listed on your receipt/contract. You will also speak with the shop manager about the way the 'guys' (this is the type of patch we would see from a 'guy/gal' who can swing a hammer...not a pro flooring installer) handled the patch. You ask WHY they did not lace in the wood. And why the grade of wood that was slotted in was not 'flagged' by the crew as WRONG. And you also ask why the full sand/refinish was allowed to go ahead with these issues outstanding. If it doesn't look right to you then why would a 'pro' (ahem...I don't think you had one on your job) think this was OK? While you wait, you bring in an NWFA Certified Flooring Installer (www.nwfa.org) to see what they recommend for moving forward/real cost to do this part of the job. Who hired the flooring company to demolish a fireplace/chimney?