Author Topic: soundproofing a floor above a basement  (Read 2874 times)


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soundproofing a floor above a basement
« on: November 20, 2014, 06:22:05 PM »
hi all, first post here...

i have recently purchased a property which sits above a basement. the basement does not form part of my property but owned by next door - basically his basement spans from underneath his house to all the way under mine. the guy next door runs a small woodwork shop from the basement and all his woodworking tools are under his part of the house so we can't hear them from our house. however, he runs an extractor fan and dehumidifier and the duct work all run under my house and the air is extracted outside.

he's done everything he can to the ceiling of the basement to stop most of the noise but there's still a small amount getting through which is annoying.

my house has high ceilings and i'm able to build up my floor if need be. i was thinking of taking up all the floor joists above the basement and filling in between the joists with 100mm insulation. then i was thinking of putting all the floor boards back down and masticking all the gaps. after that i was thinking of laying down 12mm thick palsterboard and on top of that a carpet underlay then on top of that a 18mm hard board and masticking all gaps.

do you think this will work or do you have any other suggestions please?

Randy S

  • Guest
Re: soundproofing a floor above a basement
« Reply #1 on: November 21, 2014, 12:30:43 AM »
This needs to be re-evaluated...what I think is happening here is a flanking issue " if he soundproofed the ceiling correctly"
First you need to find out what he did for the soundproofing. let me know
Then we need to determine the value of the system which is easy to do, if you have a flanking problem adding more to the floor will not change anything.

In other words the sound can be coming around the ceiling system.

If you have a smart phone you can download a db meter app and get an idea of how much noise is coming through the floor.

Find this information out and get back to me.

Randy S.