Check out Carlisle Wide Plank Floors. The package I just received has a brochure included with step by step instructions for installation of their solid wood plank flooring over concrete slab and radiant heat floors. Selection is great, and their customer service is very helpful. There are other alternatives as well such as Richard Marshall Olde Boards, but they aren't inexpensive. Good luck! Here is a link that might be useful: Carlisle Wide Plank Floors

Engineered is recommended, over soild wood, for that application. If the engineered wood flooring warps, it is defective. Solid I can see doing weird stuff, but not an engineered, with balanced layers.

Which type of radiant are you looking at? With a new build I would hope you are looking at hydronic...but I don't want to assume. Make sure the slab is insulated BELOW the heating system because it gets expensive to heat the earth underneath the house. As for the flooring, you need to tell us which option you are after: whole home heating or 'foot warmer'? The 'foot warmer' is when you have ANOTHER whole home heating system (forced air, etc) and the floor system is simply there to take the chill of the feet/legs. This is the easiest one to work around as it doesn't have to do much work. That's when you can use things like carpet or wood or even laminate (sometimes even a high end vinyl). But the whole home heating system is another beast. It has PLENTY of work to do. That means AS MUCH HEAT as possible MUST PASS through your floors. That means you want as much conductivity as possible = concrete, tile or stone. You want a floor that heats quickly and throws off heat REALLY EASILY. Wood is a semi-conductor. It is a partial insulator as well as a partial conductor. It isn't very good at throwing off heat because it has insulating properties. A laminate floor (wood pulp with a paper photograph sitting on top) would be a better choice because it is thinner than most engineered hardwoods (7mm - 12mm is normal for a laminate). But they too are made of wood-based products (wood pulp = fibre board) and will have some of the same properties as wood floors. So...the question becomes what type of heating system do you have? Foot warmer or whole home heat? Do you have a whole home HUMIDIFIER? Or whole home air conditioning? Because a wood floor will need both...the humidifier in the winter (yes...floor heat dries out wood sitting on top of it VERY quickly) and AC for summer humidity (helps dry out the inside of the house to keep the wood at a consistent moisture level). Better check your home's full HVAC set up before going forward with wood. You need climate control, not just temperature control, to keep wood happy.

Thanks...I try. Too many people *think* a concrete floor is a money SAVING project. It is not. A SLAB floor is money saving. It is ugly, unfinished and can be very rough on the feet. A properly finished concrete floor is beautiful but very expensive. Most people think slab concrete is the FINISHED floor and therefore cheap. What they do NOT appreciate is how UGLY it is and how much it stains and etches and degrades over time (chalky dust on the surface all the time). They are very disappointed in a SLAB floor. When they are told the cost to fix a concrete slab floor they look at the refinisher like they have 2 heads and say, "Well if it's going to cost me $10/sf why don't I get hardwood and be done with it?"