Is calculation required for run-out to stairs?

[JR_83]

Hello!

We are building a garage with a loft, and the original design we submitted for the order did not include a staircase. We are now starting to finish the interior of the garage and plan to install an L-shaped staircase in the furthest corner of the garage. We will need to open up a roof beam (not a roof truss) to make room for the staircase. The beam is 45x220. Attached is a picture where the red line indicates where we plan to make the opening. Is this something that requires structural calculations? I think it shouldn't be a significant alteration to the building's structure, but maybe it's always necessary to calculate? I also attach the drawing for the roof truss if it provides any additional information.

 

[Tompafix]

Hello!

We are building a garage with a loft and in the plans that were the basis for the order, we hadn't included a staircase. We are now beginning to finish the interior of the garage and the idea is to install an L-shaped staircase in the far corner of the garage. We will need to cut a ceiling joist (not a truss) to make room for the staircase. The joist is 45x220. I am attaching a picture where the red line shows where we plan to cut. Is this something that requires structural calculations? I am thinking it shouldn't be a major alteration to the building's structure but maybe you always need to calculate such things? I am also attaching the truss drawing if it provides more information.

It is not a major alteration. The intermediary joist is intended to support load on the floor. The lower part of the truss could be reduced because of this.
The load must be distributed to the adjacent trusses, and this is normally done by doubling the adjacent joists.
I think you can get a more detailed answer if you email the truss manufacturer and ask.

 

[JR_83]

It is not a major intervention. The intermediary beam is meant to carry the load on the floor. The lower arm of the truss could be reduced because of this.
The load must be distributed to the trusses beside it and normally this is done by doubling the adjacent studs.
I think you could get a more detailed answer if you email the truss factory and ask the question.

Thanks for the response! Great idea, I’ll contact the truss factory and check with them.

Best regards
Jonas