Underlay for impact sound

893bet

I am looking at a number of products for underlay.

e.g.
http://www.soundinsulation.ie/floor-soundproofing/41-sylwood-acoustic-underlay.html
reduction of 20db

and

http://www.soundinsulation.ie/floor-soundproofing/17-syl-for-laminate-and-wooden-floors.html
reduction 18db.

Is the difference going to be noticeable between the two types? from 18-20 db?


Any suggestions for underlay? Looking to reduce sound from timber joists first floor for laminate/carpet/ceramic tiles.

Via PM if required

pdiddy

would also be interested in any info on this,as planning to do the same myself

macgabhs

These materials will help reduce the tap tap tap made by hard sole shoes on a hard floor. They don't offer anything for areas that are carpeted. They also offer nothing for the thud often associated with walking across a timber joist floor. To reduce this requires mass and stiffness. Mass can be added above and below the joists using additional layers of plywood or plasterboard and the cavity within the joists should be filled with a rock wool type fibrous insulation this will also help with airborne noise transfer (voices, tv etc). Stiffness can be improved using a technique called stepped blocking which uses noggins between the joists to stiffen up the floor.