stone wall

Does anybody know where i can find data about the stc of different combinations such as: stone wall/gypsum sheets (different possibilities) cindar blocks (maybe the wrong word) /gypsum sheets etc.. thank you for this great site Philippe

What an extensive subject! Start there: http://forum.studiotips.com/viewforum.php?f=34 Good luck Andre

thank you for answering but what i am searching for is data about the tl through a solid wall coupled with a gypsum floating wall (box in a box) curiously you would find a huge amount of data about gypsum/gypsum walls but nothing (or maybe i don't know where to search for it) about what i mean here could somebody help me to find that ? this is related to my project: http://forum.studiotips.com/viewtopic.php?t=1668 and http://forum.studiotips.com/viewtopic.php?t=1675 again thanks for any help Philippe

Understtod now. With otu knowing anything axactly like what you are looking for, there are numerous with concrete block and gypsum walls, and with stone walls. IDO posted several months ago studioti[ps with an databse with hundreds if stone tyope walls. Andre

thanks for the answer i made a search with stone which returned a lot of posts but no data i also searched on studiotips and found nothing consistent would you be kind enough to give me a link to somewhere? i am searching to calculate my studio walls the exterior walls are 50cm thick made of irregular stones assembled with mortar (see pic) i intend to build a wood studded double layer gypsum rockwool damped second wall fixed on a floating concrete slab thanks for helping Philippe PS: link to my first post concerning the project http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3775

the exterior walls are 50cm thick made of irregular stones assembled with mortar (see pic)

50 cm! Off hand I don't you will need anything more for exterior sound isolation. My head comes up with a STC (yes I know) of around 53, and that is with no MAM resonance effects! I will try and dig up that link Andre

hello AVare thanks for answering do you think that this 53 STC would be enough or should i add an internal studded gypsum leaf (maybe two or three of them)? this building is in the country but there could be cars or tractors passing by 2 or 300 m away (i dont mention the air force jets flying from time to time over the place but what could you do against that?) Philippe

philofparis wrote:

. . . do you think that this 53 STC would be enough . . .

Quoting Knightfly: ". . . pay more attention to TL at 50 hZ than you do STC - if you design for the lows, the rest will be no problem." (Source) For more info about how STC doesn't tell the whole story, see the "Block walls.....to fill or not to fill?" thread.

Sharward gave th good reply. With a solid 50 cm wall, you have a TL around 30-35 at 50Hz. The STC (and Rw) are not usefull for music isoaltion. I was just using that because it is commonly known. You will not need anaything more for outside isolation from what I can read. Good luck!