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Frequently Asked Questions
Why is a concealed cistern louder next door?
Because the frame carries the noise.
It is steel, bolted to slab and wall.
So sound goes into the structure.
Rather than into the room it is in.
And arrives somewhere else entirely.
How does that differ from an exposed cistern?
An exposed one radiates into its own room.
Which is where it is expected.
A concealed one feeds the building.
Through a direct steel connection.
That is the whole difference.
What makes it hard to deal with later?
The noise has no apparent source.
It appears in a bedroom or the room below.
With nothing visible causing it.
So it is diagnosed slowly.
And remedied by opening a wall.
How does the set work?
By breaking the path, not absorbing sound.
Resilient pads, sleeves and washers.
Between frame and floor, frame and brackets.
And around the waste penetration.
Isolating steel from structure throughout.
Why does it come as a set?
Because one hard contact undoes it.
Any remaining steel-to-structure joint.
Carries the sound past the isolation.
So every contact point must be treated.
Which is why they are not sold singly.
Can it be added afterwards?
No - it sits between frame and structure.
So the frame would have to come out.
Which means the wall comes off.
It is strictly a first-fix item.
Ordered with the frame or not at all.
Where should it be specified?
Anywhere sharing a wall or floor.
With a bedroom especially.
Hotels, apartments, any party wall.
Worth specifying by default.
The cost is small, the remedy is not.