Leveling basement concrete

Question from Mel: 

I have a concrete floor that is low in the middle by 6 or 7 inches i want to level it and put down some type of a wood floor. There is not a lot of over head space. Cost is a factor.

Jake's answer: 

Mel, 

We have run into this same situation several times when finishing off a basement. 6 to 7" is a lot to level. I would start out by using a latex bonding agent on the existing concrete and then place a regular sack concrete mix and level the floor within 2" of level. Let this set up for 7 days before proceeding to the next step. To finish off the leveling, use a self-leveling mix over the new concrete. Check out quickcrete.com for some information about these types of products.