So today I started working on our basement.. The wife and I are hoping to have it completed before the baby comes in Jan. of 2012.. (Very Ambitious..) I figured I would start this thread for you guys to comment on my progress, and any suggestions will be welcome, and taken into consideration.. I'll start out with here is what I did today:
Took out part of the wall to open up the stairway..
Put up 2" XPS and I am building the wall out of 2x6 top plate and 2x4 PT bottom plate with Poly Sill Seal under it, with regular 2x4 studs.
What my plans are for fireblocking:
With the top plate being a 2x6...
I have it almost against the cement foundation..
I left this small gap between the 2x6 and the XPS, in which I will spray Great Stuff Fireblocking Foam..
Is that an acceptable method? Thoughts? Comments? I also thought I would mention, we plan on putting in a drop ceiling.. so would I have to actually have fireblocking lower, where the drop ceiling starts?
I know I have to fireblock every 10 feet side to side, so I figure at the end of that 10 foot chunk of wall, I will cut a 1" slice out of the XPS and put in a sheet of drywall thick enough to go to the cement, and foam it with the great stuff fireblock spray.. Again, acceptable?
This is my first time doing anything like this, but I am fairly capable at it (I think) The basement will be completely rewired, so try not to pay attention to the wires

I will try to keep this thread current, as I am always looking for insight from people more professional at it than myself. Thanks!