Gaps behind skirting board and sound issues

[opps]

what was its name?

The following is rated at 60db

https://www.screwfix.com/p/soudal-genius-insulation-foam-hand-held-750ml/25943

 

[endecotp]

I don't know where Screwfix get that 60 dB number from; it's obviously going to depend on how thickly it is applied. The Soudal datasheet just says "High insulation values, both thermal and acoustical":
http://www.soudal.com/geniusgun/en/diyen/technischeficheEN.pdf

 

[endecotp]

Hmm, but this one:

http://www.soudal.com/soudalweb/productDetail.aspx?w=8&p=498&ID=4319

which is not the same as the one Screwfix lists, does say -58dB to EN ISO 717-1.

You can read EN ISO 717-1 here:

http://p11.680.com/Item/2015-8/29/0_201582919355.pdf

As far a i can see it is all about the complex matter of noise spectrum, and getting a single performance nunber for a product that may be better for high than low frequencies, or vice-versa; I can't see anything about what thickness of material is to be tested.

 

[erlendd]

Yes it was the Soudal one from screwfix. Totally agree that it's meaningless to give down decibel value without saying how thick it needs to be. Also, they don't specify which frequencies it cuts out. Regarding the latter point at this stage I care a lot less about the low frequencies than the high ones: I don't mind hearing them, I mind hearing their conversations (and their baby).

I stuck a small borehole camera down to have a look in the joists, and it occurred to me that the seal between their wall and their plasterboard ceiling might be poor. With walls never being precisely flat, how do builders avoid gaps around the side of the ceiling??

 

[endecotp]

Fill gaps between walls and ceilings with intumescent acoustic sealant.