Is it OK if the housing of a Halo H7ICAT comes in contact with a wood joist? I know it's made to come in contact with insulation, but not sure about wood or other combustibles. Also, I'm planning to install 6 cans all about 4-5 feet apart. When I run the romex between cans in a daisy chain fashion, do I need to staple the romex somewhere between cans?
close to wood not a problem. It is always a good idea to staple wire if you have access, but not a necessity. If between floors, it is often impossible. Wires should be kept 1 1/4" away from surfaces where nails/screws may penetrate.