How to build a double stud wall under steel beam?

Lethaleigh

I've just had an internal 75 mm thick stud wall built in garage under a steel beam for a second bathroom.

I need to attach a second frame as the beam is still protruding another 60 mm out, my thought is to use 90 mm studs nailing to existing studs and when I reach the beam, to cut 60 mm in to go around the beam,

leaving a 30 mm stud to continue to the ceiling for plastering.

My concern is that this may effect the integrity & strength of the wall.

I will be tiling a shower there, thanks Leigh

MitchellMc

Hi @Lethaleigh,

I’d suggest an alternative approach to ensure the integrity and strength of the wall, especially since it will support tiling in a shower area.

You’ll need to create a second stud wall using either 70mm or 90mm timber. This new frame should rest on its own bottom plate and be securely attached to the existing wall. Building an entirely new frame in front of the existing one will provide a solid foundation for attaching sheeting and tiles. Simply nailing 90mm studs to the face of the existing ones isn’t ideal, as it doesn’t provide the structural stability required for tiling.

At the top, where the wall meets the steel beam, you’ll likely need to construct a secondary frame that fits within the beam’s profile and is securely attached to it. This could involve notching or cutting the timbers to accommodate the beam. However, I’d recommend consulting a builder regarding potential movement between the beam and the stud wall, as this could cause issues with the connection over time. An expansion gap or flexible material might be required at the transition to accommodate any movement and prevent future cracking or damage to the tiles.

By creating a new frame and addressing the transition at the beam, you’ll ensure the wall is strong, stable, and ready to support tiling in a wet area. 

Please let me know if you have any questions.

Mitchell