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Junctions with floor penetrations (excluding gas pipes)
3.41NI-wide·Technical Booklet G Resistance to the Passage of Sound
Pipes and ducts that create a hole that penetrates a floor separating habitable rooms in different flats and maisonettes should be enclosed for the full height in each flat and maisonette (see Diagram
soundflatsdrainageEnclosure construction for ducts and pipes
3.42NI-wide·Technical Booklet G Resistance to the Passage of Sound
The enclosure should be constructed of material having a mass per unit area of at least 15 kg/m2. Either line the enclosure or wrap the duct or pipe within the enclosure with 25 mm unfaced mineral fib
flatssounddrainageFire protection for duct and pipe penetrations
3.43NI-wide·Technical Booklet G Resistance to the Passage of Sound
Penetrations through a separating floor by ducts and pipes should have fire protection.
flatsfire-safetydrainagePoints to watch – Do requirements
3.61(a)-(e)NI-wide·Technical Booklet G Resistance to the Passage of Sound
(a) Do fill all joints between parts of the floor to avoid air paths. (b) Do give special attention to workmanship and detailing at the perimeter and wherever a pipe or duct penetrates the floor in or
sounddrainage