12/26/2023 0 Comments Rottenwood creek fishingExample: For 4' exterior cantilever the interior length should be 8'. However, in our neck of the woods when cantilevering, the structural framing members typically has the internal length of the framing member twice the length of the exterior cantilevered portion. Sistering the internal joists, then bolting (lag bolts or through body bound bolts/washers/nuts, carriage bolts/washers/nuts) & using construction adhesive would certainly provide for a secure means of attaching the cantilevered joists. Having that exterior preservation treatment would be very beneficial over the long term. So, you might want to consider the use of Paralam Plus PSL. LVL engineered lumber is very strong, yet unsuitable for typical pressure treatment due to the glue lines & materials. ![]() Obviously, securing back to floor, bottom plates, etc. I would add a board on both sides of the joist's mating ends, and bolt together with the use of construction adhesive. Coming in with the exterior joist by 6', then using 3' on either side of the the joist's butted ends. I was thinking about sistering the floor joists. KDAT lumber - should this be a consideration? Expensive, but.?ĥ. Since the floor joists actually holds up interior gable end walls, and interior walls, do I need to worry about using pressure treated wood and it shrinking and causing problems?Ģ - If I were to use interior wood, how would one treat the interior wood to prevent rotting on the exterior?ģ. If I use treated lumber, it will shrink as it dries. I have access to the full length of all boards, drive in garage ceiling is not finished.ġ. I think I have a good plan to replace, but I don't know what kinds of boards to use. It appears these joists/boards are NOT treated lumber, and were sealed and painted with something. I have numerous exterior floor joist portions that have rotted and need replaced. The deck floor joists extend from the interior, which also holds up the floor in two rooms and the gable end structure walls off the foundation/block. So, I have this cantilever deck that was built in 1979.
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