I would like to insulate and finish both the basement walls and the floor. I have heard that delta-fl is very good to lay on the floor first. Looking for feedback on this product. Also the floor is angled towards the floor drain. Does the floor have to be leveled first and if so how to do it. Thank you. Richard

Never heard of this stuff but it appears to be the same type of material as Detri sold at many Home Depot stores.
which is an underlayment uncoupling membrane. It is a very good material for floors that move from expansion such as wood. This will not provide any insualtion value however.

http://www.schluter.com/2080.aspx

Using this product for insulating is not going to pay to many dividends. Your primary loss of heat is the ceiling then the walls then the floor. The floor will still feel cold with this product as the R value is quite small. The cost of this material I suspect is a lot more then what you would recover in heat savings within a resonable amount of time.

Please understand, its not that I do not like the product. But from my experiance this is a homeonwer quick fix system that hides issues rather then corrects them.

I would be very carefull of using this type of product under the floor if your planning to use a laminate system. The warrenty on the floor may be void. Although the manufacture states it prevents moisture from coming up from the floor then in the same paragraph states it allows just enough moisture through to keep the room comfortable with moisture? Sounds funny to me. My personal experiance taking up floors that have had mold built up under the sub-floors leads me to stay away from all of these products. They are just to expensive and are a dog to remove once placed down. I do not like the fact that it does not allow the moisture that collects to breath out from the floor. It holds it until it condenses and then where is the water supposed to go? What happens if your basement floods and water gets under this product? How will you remove it?

If you haveing issues with damp floors fix that first. Do not cover it with magic products that simply hide the problem until it gets so bad something fails or someone gets sick. Being a plastic material it will take many years for issues to be visible, by then you will have an expensive fix on your hands.

Depending on how much a pitch is on the floor would depend on whether or not you want to change it or not. Some pitch is good if you experiance water issues. but if not you can level the floor. Its a lot of work however. If your planning to use a laminate, you need to check with the supplier on how much pitch is acceptable with their product. Some floors require only level floors to be applied on. Others will allow slight uneveness.

What type of floor are you planning to place down in the basement? I never suggest that people use carpet and padding. It holds to much moisture that seeps from the floor, thus raising the microbial level in the room. I always suggest that the floor be tiled then area rugs be placed where comfort is required. These can be taken out and professionally cleaned when they get dirty. Electrical heat units can be set into the floor under the tile where children play or where your sitting for long periods to keep your toes warm. They simply set into the cement on the floor before the tile goes down. They use very little electical current and work fine.