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Natural Science Forum / Physics / Acoustics / April 2004Sound Insulation - Screeds -v- Platform/Batten floating layers
Hi Does anyone know why a screed could not substitute for a platform/batten floating layer in a separating floor system? In the main part of the Approved Document E of the UK Building Regulations the two are interchangable; however in the robust standard details, Steel Floor 2 has only been tested with platform or batten floating layers. A client wants to use the floor base and ceiling treatment from SF2 in the robust standard details, but with a screed with underfloor heating as the floating layer. SF2 can be seen at Page 129 of http://www.odpm.gov.uk/stellent/groups/odpm_buildreg/documents/page/odpm_breg_02 3605.pdf Any comments would be much appreciated. Thanks Mel Kenyon > A client wants to use the floor base and ceiling treatment from SF2 in the > robust standard details, but with a screed with underfloor heating as the > floating layer. My experience with isolating floor/ceilings is that the isolated ceiling below the floor is much more significant than most treatment layers placed on top of the structureal floor. Therefore, it is possible that the screed you want will not make much difference. In examining page 129, I see that a rasonable air gap is implemented above the geiling drywall, so there is a good chance it will work. Beneficial additional actions are to use resilent isolating channel to mount the drywayy below, and to place fiberglass or glass wool into the cavity above that drywall. These will replace any loss if isolation that may have been provided by the battens and space above. Angelo Campanella >> A client wants to use the floor base and ceiling treatment from SF2 in >> the >> robust standard details, but with a screed with underfloor heating as the >> floating layer. Such laminates are throwing pennies at the problem. I have just witnessed the MOST importnt advance in this field than I have see for decades: An owner (young man-open-minded), in adapting an old factory building to work-live spaces (fully similar to apartments-cum-condominia), voluntarily bit the bullet and is planning install a full-area platform about 14" high that contains not only yhe desired isolation, but also a majority or all of the ductwork and utilities. Thus, in one fell swoop, he has implemented the opportunity for excellent noise isolation while at the same time, and most importantly, allowed the ceiling of the floor below to "expose joists and planking" for the full aesthetic effect. There is hope! Angelo campanella > >> A client wants to use the floor base and ceiling treatment from SF2 in > >> the > >> robust standard details, but with a screed with underfloor heating as the > >> floating layer. Hello, here is the website of a swedish company that has a good and tested system: http://www.granab.se/gb/svstart.html However, I don't know wether they have a distributor where you live. Regards, Alain Bradette > Such laminates are throwing pennies at the problem. > [quoted text clipped - 15 lines] > > Angelo campanella > here is the website of a swedish company that has a good and tested system: > http://www.granab.se/gb/svstart.html My imagined serendipidy thence is really merely only good judgement! Thanks... Angelo Campanella > > here is the website of a swedish company that has a good and tested system: > > http://www.granab.se/gb/svstart.html [quoted text clipped - 4 lines] > > Angelo Campanella Hello Angelo, That sort of "computer floor" is indeed an interesting solution. Your young open-minded man was on the right path! What is even more interesting is to have some reliable sound insulation data as that manufacturer provides. I doubt however that one can apply those datas to other systems since Granab's system use a rubber (neopren?) pad between the "studs" and the channels wich as an effect at least on the impact insulation. regards, Alain Bradette > manufacturer provides. I doubt however that one can apply those datas > to other systems since Granab's system use a rubber (neopren?) pad > between the "studs" and the channels wich as an effect at least on the > impact insulation. It is feasible to lay neoprene under the support points for the floor, and I recommended that. That original floor is thick plank and strip, so reasonable isolation is feasible. I could not get them to pay for total sealing; I was only able to exact a promise that they would serch out and seal all holes and loose seams... It would be nice to test that floor when finished with a tapping machine, but this client is "on the cheap".. So it is iffy whether I will get to do that. I might get him to pay for a test of two if I can present an apparent need for it. The only rationale I can think of is to say "Let's be sure before occupancy.....". Angelo Campanella > It would be nice to test that floor when finished with a tapping > machine, but this client is "on the cheap".. So it is iffy whether I [quoted text clipped - 3 lines] > > Angello, It might help if the young open-minded guy is a Hi-fi freak or has a home cinema: if the sound insulation is good, he will be able to play louder. "let's be sure before occupancy" can then be a good argument to check the insulation and eventually correct what fails. But I do understand how it is difficult to make a client pay for tests before troubles occur. Even here, where the legislation says that a least 5% of the rooms of a new building must be tested for airborne and impact sound insulation, we have way too few opportunities to controll the quality of what we have designed. Alain Bradette |
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