Do not keep stacking a riser that is hanging from light-gauge framing or sheet metal straps.
Check
Identify what is actually carrying the riser weight.
Check the number of sections/floors already stacked and whether any support is deforming.
Look for wall studs bending, screws pulling, duct crushing, or slab opening contact.
Find the approved riser support detail for this shaft/system.
Secure the condition before adding more duct weight.
Steps
Identify what is actually carrying the riser weight.
Check the number of sections/floors already stacked and whether any support is deforming.
Look for wall studs bending, screws pulling, duct crushing, or slab opening contact.
Find the approved riser support detail for this shaft/system.
Secure the condition before adding more duct weight.
Say this to your foreman
This vertical riser is being carried by light straps/studs at [location]. I checked the load path and it does not look like a structural riser support. Do you want us to hold and install the approved riser support detail before adding more sections?