I need to extend an existing glulam beam in my 1&1/2 story house and am wondering if anyone can suggest a suitable method/fastener. Attached is a sketch showing the current layout and the expected outcome. The beam is a 90x300 glulam with one end in the exterior wall and the other supported by studs in the central wall. A new opening is to be created in the central wall, requiring the beam to be extended. However, the existing opening will be reduced to 1500 mm, and there will be more supports for the beam. The new opening won't be wider than the current one, so I'm ok with the structural integrity. My concern is that the joint between the new and existing beam is 22 cm from the beam's center to the support. I could solve this by doubling a beam alongside the existing one between the two supports where the joint is. But I would prefer a more streamlined solution if anyone has one.
A gerber connection might work depending on the size of the load. The fact that the joint is located outside the column does not necessarily need to be a problem.
If you want to put some effort into a neat joint, you can take a circular saw and set it to a 20 mm depth and make tight cuts on both sides of both ends of the beams about 50 cm in from the ends.
Then, take a chisel and remove what the saw didn't reach until you have smooth surfaces, check with a steel ruler.
Once you've lifted one beam into place against the other and secured it so it lies end to end (possibly with a little over-tension), you can start gluing and nailing planed 20 mm pine boards, one meter long, on both sides of the joint.
Use PU glue and moisten the surfaces before gluing. 60mm galvanized wire nails are sufficient; nail in a pattern of 3x3 cm, which will require just over 1000 nails.
Alternatively, you can rely solely on the glue and use sturdy clamps.
Once the glue has expanded and dried, you may need to tidy it up a bit with the chisel, possibly also with a belt sander. Fill where needed (preferably with something that withstands outdoor conditions like elastic plastic padding).
Apply two coats of paint on this, and the joint will be invisible.
Edit: I assumed that the beams will be visible and painted (?)
I am going to extend an existing glued laminated timber beam in my 1&1/2 story house and am wondering if anyone can suggest a suitable method/fitting. I am attaching a picture of a sketch showing how it looks now and how it will be. The beam is glulam 90x300 with one end in the outer wall and the other on studs in the heart wall. Now there will be a new opening in the heart wall and the beam needs to be extended. But the existing opening will shrink to 1500 mm and there will also be more supports for the beam and the new opening will not be wider than the existing one, so I am okay with the load-bearing capacity. My concern is that the joint between the new and existing beam will be 22 cm from center-to-center beam to the support. I can solve this by doubling with another beam alongside the existing beam between the two supports where the joint is. But I would prefer a more efficient solution if anyone has one.
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