Sound proofing Joisting.

AckwelFoley

This is my first thread here

Im starting a job in a few weeks where i will be studding the upstairs of my sisters new house. I will be sheeting the floor and studding it, fixing the plasterboard .. door frames etc..

Now, i want to make the sound proofing between the upstairs and downstairs a good as i can.

I, at the moment am undecided as to either screw the ply directly to the joisting and use a high quality underfloor foam for the wooden floors , its a rubberised underlay i believe, or if i cross baton the joists with 2 by one and a half or 2 by 2 and screw down the ply to that... or possible do both?

Obviously i will use the appropriate thermal and sound insulation between the joisting, but as i do know that cross batoning the joisting reduces the contact between floor and joisting therefore reducing the sound upstairs from travelling.

Any thoughts?

Mellor

If I remember correctly, griffener had a seperated structure in their floor.

Standard joists
Then battons laid
Then flooring

The battons weren't crossed though, crossing the battons might create a weak/springy floor. Instead the battons were laid on top of joists in same direction, but stiff rubber "shoes" were fitted to each batton along its lenght. This reduces contact to same area as it you crossed them, but it all acts to deaden the sound a little.

AckwelFoley

ah, yea i see what you mean about the cross battoning... although with the joisting at 16" centers, and if i used 2 x 2 i wonder if this would still pose a problem? I certainly would rather just lay the OSB on the joisting directly, that take a chance of having a squeeky floor... and just use the rubber underlay...

*hmmmm*

250882

what ever you do make sure you use plenty of bridging pieces max
1380mmc/c. the most common cause of noisy floors is lack of bridging.