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Top one is partially threaded, made to pull things together, the other is fully threaded made to hold things together

​@@kacper.6537 nope... the top one has a wide head.

Hello Bigal25938, Notched beams can be applied in all sorts of scenarios. Notches may be found in floor beams, roof beams or girder beams for instance.

Killiungjaro, fasteners and connection technology have the same use, they hold the "bones" of the building, i.e. the structure together.

Hi Joe, it is correct that design codes limit notches for this reason. However, there are things like "accidental notches" or penetrations and opening in bending members that sometimes are required to accommodate services. In those cases, as an emergency repair or to allow openings in bending members the reinforcing possibility bis a great tool and problem solver

@@maxclosen7457 I agree.

Thank you Pocketfarmer1 for this comment. This is correct. Back in the days reinforcing technology such as long full thread self tapping wood screws did not exists. Through the understanding of historic mechanics and stress flow master builders rounded the corners to allow stress to change more gradually rather than with a sharp spike at the origin of the notch. This technology works still today, we have tested that a few years back. The issue there for engineered large scale structures is however that we are then again dealing with the uncertainty of wood and larger variations due to natural things like knots and slop of grain irregularities. This, in todays environment is a challenge to proof reliably from an engineering point of view and it also increases machine time if one looks and considers CNC machine cutting. The better choice today, with a reliable outcome is to apply reinforcing screws with long full threads because we can control the properties and performance of our reinforcing efforts.

@@maxclosen7457 given what you you have said , mightn’t a combination of the two techniques be stronger. Where a long curve well beyond the shelf plate ends , then reinforcing screw at some optimal point through the full thickness?

@@Pocketfarmer1 Thank you for the question around this topic. A combination of both technologies will not work, it will not make the connection two times stronger. One of the reasons why this can not work is the different stiffness of the reinforcing methods. The reinforcing screw option is much stiffer than the wood fiber perpendicular to grain and will therefore attract the load first. Only after the reinforcing screws fail the rounded corner option will kick in. Since the load, due to the reinforcing screws, will have accumulated to a level exceeding the wood fiber strength, you will be seeing an immediate failure of the notch even with the rounding.

Will curving the notch make the beam stronger than installing the full thread screws, and is there a formula for the size of the radius?

@@huejanus5505 From our experience in the testing smoothing the corner only has some small impact on the notch strength. It is much weaker than a full thread wood screw reinforcement and still subject to randomness caused by slop of grain and regular wood irregularities. For applications in structural settings we would recommend to go with a screw reinforcement. I myself am not aware of a formula. If you are interested in this you may reach out to the Timber Framers Guild in the USA, there are some good folks there with a lot of historical knowledge.

Hello Jesse, good question, thank you. The Answer is yes, you can install the reinforcing screw from the bottom up, it is the same procedure overall. Contact a local design professional to help you determining the embedding required below and above the notch.

on a pine board the darker grain lines are stronger/denser, it’s noticeable on a old deck or something you’ll feel the ridges from where the lighter parts have shrunk. I’m not sure what you mean about your question though

@@james3522 It would also make sense that knots are very hard and very dark.

Hello Jose, the broken joint is pulled back together using a washer head screw. The reinforcement is achieved through a full thread wood screw similar to a rebar in concrete.

@@maxclosen7457 thank you do you have a model number or name for the screw

Our team of engineers would be happy to help you out with your project, you can reach them out by emailing support@mtcsolutions.com

How about that B Rush? You have an entire team of engineers assembled together to recommend your screw!

The equivalent UDL was approximately 33kPA. One can visualize that as a approximately 3m of vertical water stacked up on the panel.

Hi, Thanks for your question! in some cases such as for bigger panels, 4 yokes anchors are used, therefore they could be used at an angle pointing towards the centroid of the panels. The yoke system is currently the only tested and approved lifting solution for Mass Timber in North America. The design values do carry a minimum safety ratio of 4 based on test results completed in the USA.