I have a patio that is under a sun room addition. It already has a concrete slab under it. I want to frame it in - do I need to do anything specific before setting up the 2x4's? Do I need concrete blocks on the concrete floor first before I put down the wood frame? or Can I just start the frame on the existing floor?

Also, Do i need to drill the 2x4's into the concrete? Since its an existing structure, Can I just attach the wood to the existing wood supports instead?

Any help would be appreciated!!

~Amber