Render over steel beam

[Moonshine]

U have the arrangement below, and need to prep the outer steel for rendering.

The renderer i am in discussion with has said for prep is screw a timber tight inside the web of the steel, and then screw render board to the timber to be flush with the outside of the web.

how does that sound?

 

[markc]

Generally right but I would take the board over the flanges to improve adhesion and reduce possibility of leaching or a potential crack line