Adding Joist to Existing & Intact Floor
Hello, I want to tile the floor of this 6.5'x9.5' bathroom. This was an add on in the 30's or 40's. The problem is that the 2x8 joists are 21" OC and not adequate to to support stone tile installation. I have added pictures of the crawl space to illustrate the current conditions. This add on has joist running perpendicular to the rest of the house.
picture #1. general area of concern:
My plan is to add 2x8 joist in between the existing joist for a total of 4 additional joist.
Picture #2. Close up of the far end resting probably 8" on the ledger (or what ever it's called).
Picture #3. This is the end that meets the existing house and is kind of poorly secured in my opionion.
1) So can I add hangers to all the ends that have just toe nailed attachments to the joist at the main house as in picture #3?
2) How would it be best to add additional joist in between the existing joist?
3) How do these additional joist get fastened to the sub-floor?
BTW the bath room floor is as follows:
diagonal 3/4" x 4"
3/4" fir tongue and grove
layer of old linoleum
Any information would be very helpful. Thanks for your help.