Method
- How to repair Joist Ends with Joist End Repair Plates
- Support
the joists to the ground using props or jacks
- Cut off
the damaged length (up to a maximum of 17" - 432mm - to include
the piece in the wall)
- Fix one
of the pair of shouldered, galvanised plates with a few nails into the
parent timber, through the nail holes provided, with the plate resting
on the bearing support wall
- Choose holes
for the coach screws that avoid splits and knots, and then pilot drill
the holes with a 6mm wood drill. Avoid placing the coach screws in straight
line, because this might split the wood along the grain. Insert the
coach screws and tighten lightly.
- Choose holes
for the bolts that avoid splits and knots and then drill through the
wood with a 10mm diameter wood bit.
- Push the two bolts through
the plate and the wood - don't forget to fit the washers
- Take the second plate and
push it onto the protruding bolts. Fit the washers and tighten the bolts
firmly.
- Check that the plates are
both seated tightly under and against the joist. If not, remove the
plates and start again.
- Choose holes
for the coach screws that avoid splits and knots, and then pilot drill
the holes with a 6mm wood drill. Avoid placing the coach screws in straight
line, or dead opposite ones on the other plate, because this might split
the wood along the grain. Insert the coach screws and tighten lightly.
- Tighten
all the coach screws and nuts firmly.
- Treat the
exposed cut end of the parent joist using our Boron Gel, to prevent
future decay.
- Cut a piece
of matching timber as an infill piece, treat with Boron Gel and drop
in to the space to fill in the gap to the wall (optional - not supplied
- often not required in short repairs
 
Joist end repair plates - can
also be used for reinforcement of weakened joists.
BRE Joist
Spacing Table
BRE Notching
and Drillinf Holes in Joists
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