The Timber Joist Connector Bolt Set is an essential component for connecting new sections of joist to existing ones that have been compromised by fungal decay. Manufactured to the highest quality standards, this set provides a durable and secure connection, ensuring the structural integrity of timber frameworks.

If you are running the sistered joist the same length as the old joist, then your job is easy – keep it the exact dimension as the old joist. If you are cutting a partial joist, use the ⅔ rule if possible. That means if your joist is 12’, then a sistered joist of 8’ minimum is adequate. This will be the most time-consuming part of the process. All wiring, plumbing, HVAC, and other impediments will have to be removed. This usually means removing wires from the breaker box, detaching pipe from valves, and removing ductwork. Most I-beams will have a 1” difference between the web and the outer edge of the flange. You’ll have to fill that in ½” plywood or OSB in two layers. When doing so, stagger the pieces, so gaps do not overlap. Once you’ve filled in the web, use ¾” plywood as the sister joist, being sure to continue to stagger your plywood over the top of one another.

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The M12 nut is included to securely fasten the bolt to the joist. Its reliable quality ensures a tight connection, preventing any unwanted movement or weakening of the joint. It is recommended that sistered or double exterior joists be covered with a waterproof membrane or tape. The material will prevent moisture and debris from becoming trapped between the planks and causing rot.

Double member trimmers and trimming joists should be fixed in line with a minimum of two nails or two bolts at 1/3 span positions. Furthermore, as a minimum, the fixing centres (S) for double member trimmers and trimming joists should be at centres of no more than twice the joist spacing (up to a maximum of 1200mm). However, required fixing centres vary according to the total length and load on the joists.Enhanced Structural Strength: The Timber Joist Connector Bolt Set reinforces weakened joists, significantly improving their load-bearing capacity and overall structural strength.