Rotten Floor Joist And Wall Plate

17 Nov 2008
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United Kingdom
I am building a kitchen extension and have just raised 2 PFC's into postion and demolished what would now be an internal wall. The wall plate sits on approximately 1" of mortar on top of one of the PFC's. Everything is propped (Strongboys for the wall and acros for the floor joists). The walls are fine but I have noticed that the bath has dropped by about 3-4mm and on inspection, the wall plate and at least one joist in that area are partially rotten (the joists were supported about 1.5m from the wall). My intention is to cut out the rotten section of wall plate(about 3 feet), cut out the rotten section of joist (not sure how long until I open the ceiling) and "sister" the joist. To secure the new section of wall plate, I intend to use nails in the wood embedded in mortar. The new section of joist would sit directly on the new wall plate. Can someone please confirm the following:
1.My method of repair is correct
2.If the rotten joist is 12" long, how long should the sister timber be.
3.What size and spacing of bolts should I use for the sistering or should I use a metal "sleave"
4.Can the wall plate be fixed using the method I described
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