How much are top plate and truss strength affected by notches according to the picture?

[Barnrikehuset]

Have only put up the posts so far, waiting for spring so I can paint the glulam beams before I lift them up. The idea is that the rafters go between the glulam beams (carrying beams) so that they are level at the top (the rafters are much slimmer than the glulam beams).

The plan is to first mount the overhanging parts of the rafter, about 30-50 cm (screw from the inside), and then the rafter itself, which rests on a batten screwed against the carrying beam.

 

[JKrister]

Sounds like a great idea.

 

[Mikael_L]

Such a screw, what is the advantage of it not having an unthreaded part at the base? Does it act as a reinforcement in structures where it's believed the tensile strength in a particular direction must be increased? For example, in this case where there is a risk of "splitting."

It probably isn't suitable for joining two parts (unless pre-drilled) and is only meant for solid individual pieces?

There is essentially no clamping length to speak of, but maybe that's not as important in wood...

I assume the head is mainly for driving it in and doesn't have any function as a load bearer.

Anyway, it's a cool screw that seems to be available in sizes up to 300mm.

As I read femitolvs’ post, I think this screw is meant to be driven across the timber to avoid splitting (though I would have used the term spjälkning, which I think is more common when it comes to timber).

Kind of like some reinforcement in the wood.