Will this work or will it sag? I tend to think it will sag. A friend told me to cut all the bad joists back three feet to the good wood, then add a three foot section of new joist from the pocket up to the old joist, by sandwiching both the new and old joist on each side with long metal plates using 12 to 16 bolts. I would sister new joists onto the old ones but there is no room in the pocket to support a second joist. Thankfully there was no plate in this design, so the rot was confined to the floor joists, but the floor joists have rotted so much in these brick pockets that the joists have crumbled and the floor has fallen 2'' in some places. Now the problem is that this house had water damage in the past and about 30 of the floor joists are rotted at the outside foundation wall. Each of these pockets is just big enough for one joist to fit into. The joists run 15' from the main support beam to a brick pocket in the foundation wall.
The center beam of the house spans these pillars. There are pillars running every 10' or so that break the crawlspace up into two seperat 15X60 areas. first of all the footprint of the house is about 30X60. The house I just bought has some serious floor joist issues.
