There is not much you can do here I am afraid. I would suggest you convert it to integer when you do the Select, but that will not help since you store Feet AND inches in the same field.
For example, you could remove the ' and '', but that means 10'5'' would convert to 105, which makes no sense.
If the field ONLY kept inches or ONLY kept feet, then it would work. But as such, there is no way I can think of to get the values you need.
Sorry. This is just another reason we should be in the metric system.
Ultimately the best solution is to covert all the data to inches and store it is a numeric or integer.
Sorry, but it looks like you are out of luck on this one.
`Le