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Frequently Asked Questions
Where does rooftop vibration actually show up?
Often nowhere near the plant.
Energy enters the deck through the curb.
It travels along beams and down columns.
It re-radiates as sound in distant rooms.
Complaints come from floors below.
That path is what an isolation curb breaks.
How does the curb interrupt it?
The unit sits on isolators within the curb.
Springs or elastomeric mounts carry the load.
A flexible seal spans the moving joint.
The structure takes weight but not vibration.
Upper and lower sections stay separate.
Nothing rigid may bridge them.
What decides isolator selection?
The equipment's lowest operating frequency.
Isolation needs the mount much softer than the disturbance.
A stiff isolator under a slow fan transmits everything.
At the wrong frequency it can amplify.
Operating speed must be given to the supplier.
Footprint alone is a guess.
Why does weight distribution matter?
Rooftop units are not evenly loaded.
Fan and compressor sections are far heavier.
Uniform isolators leave the unit tilted.
Some sit outside their working range.
Rates are specified per position.
Supply the weight distribution when ordering.
What usually fails?
The flexible weather seal.
It must stay weathertight while moving.
Twenty years of movement and ultraviolet.
It is the one consumable in the assembly.
Inspect it during roof surveys.
Replacement is straightforward if caught.
What ruins the installation?
Anything rigid bridging the joint.
Bolting the sections together to ease sealing.
Rigid duct or conduit crossing the gap.
Pipework clamped to both sides.
Any of these removes the isolation entirely.
Check for bridges at commissioning.
Is an isolation curb always needed?
No, and it should not be automatic.
Plant over unoccupied space rarely needs it.
Heavy structures transmit less than light ones.
Sensitive spaces below make it essential.
Assess the path, not just the equipment.
Retrofitting after complaints is expensive.