Screwing aluminum extrusions to steel
Screwing aluminum extrusions to steel
(OP)
Anyone have any advise on when the dissimilarity of steel and aluminum becomes a problem.
I'm looking at a high end residential steel interior stair stringer that wants to have an aluminum extrusion anchored to it. The extrusion is what anchors a glass railing to the stringer. A typical detail shows screws into the element supporting the extrusion.
At what point is the dissimilarity of the metals a problem?
I'm looking at a high end residential steel interior stair stringer that wants to have an aluminum extrusion anchored to it. The extrusion is what anchors a glass railing to the stringer. A typical detail shows screws into the element supporting the extrusion.
At what point is the dissimilarity of the metals a problem?






RE: Screwing aluminum extrusions to steel
RE: Screwing aluminum extrusions to steel
thread507-129229
RE: Screwing aluminum extrusions to steel
RE: Screwing aluminum extrusions to steel
Will the high-end residential client be understanding if corrosion does occur?
Be safe! Separate the metals per JAE.
RE: Screwing aluminum extrusions to steel
If you look at corrosion charts, steel should cause aluminum to corrode. Well....it does, but the initial corrosion on the aluminum creates a passivation layer, the aluminum is then protected, and then the steel starts to corrode without anything to prevent it. That's why you commonly see carbon steel fasteners corroding when used to fasten aluminum.
The materials don't have to be drowned in an electrolyte in order to corrode. Vapor collection/condensation at crevices can do it.
Being inside only makes it take a bit longer.