Floor Joists into steel

[Geo57]

Hi

I need to insert floor joists (200x47) into the web of a steel beam which is a 305 ub

The floor joists only need to go into one side of the steel, so am I correct in thinking that I just need to bolt a timber into the web on one side and fix this through with bolts and washers? (All videos I have seen show timber bolted in on both sides)

Also, as the joists need to be positioned at the top of the beam on hangers, am I best using a 300x47 timber infill, so it fills up the entire web (rather than a 200mm infill which would have a gap of 100mm below? And packers behind this to bring it flush to the edge of the flange?

Thanks
George

 

[tony1851]

Might be easier with the 300 timber as it would then leave you with some timber below the level of the joists, making it easier to nail the Fireline board.

 

[noseall]

The floor joists only need to go into one side of the steel, so am I correct in thinking that I just need to bolt a timber into the web on one side and fix this through with bolts and washers? (All videos I have seen show timber bolted in on both sides)

We fill out our beams both sides regardless. It helps when you are cladding the beam afterwards as Tony said above.

shazzabeam10.jpg

• noseall
• 31 Mar 2025

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• noseall
• 31 Mar 2025

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• noseall
• 5 Dec 2024

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• noseall
• 28 Feb 2024

woodfill1.jpg

• noseall
• 28 Feb 2024

 

[^woody^]

You need to be mindful of the number and locations of any drilled holes, and whether these should be designed or confirmed by the engineer.

Timber in the full depth of the web would be preferable, with staggered fixings to control cupping. And fixings to be within the middle third of the web

 

[cdbe]

I just stuck mine in the web with a row of noggins to keep them all in place. Presumably you could sit yours on a couple of 4x2's screwed to the flange if they need to go higher.