quick Window question...

Paulkent · Post by **Paulkent** » Thu Dec 22, 2005 2:33 am

Hi there all.

You've all been immensely helpful so far..

quick question. In order to get the best insulation, do I put single glazing between A-B and also C-D?

or do I somehow create a barrier between A-C and B-D and then single glazing between C-D? (thus increasing air space and insulating against external noise spill from outside to wall cavity..)

thanks!

Paul

cyeazel · Post by **cyeazel** » Thu Dec 22, 2005 6:01 am

Your second option would be the best choice because you'd have two panes of glass which is what you are after. Your first choice involves three panes which actually makes things worse when it comes to sound isolation. The main thing to remember is MAM (mass, air, mass) or in other words, one leaf of mass followed by one airspace followed by another leaf of mass. As for the gaps between wall and window frames, they can be covered with some sort of cloth wrapped, soft type of board ( sorry, don't know the technical names for this type of wood, there are other threads with more detailed info on materials, do a search and you should find some answers) but basically what you want is some sort of material that does not transmit sound well as to avoid bridgeing your separate wall masses.

Paulkent · Post by **Paulkent** » Thu Dec 22, 2005 9:07 am

Thanks for you help so far.

I think I understand you, although I'm still a bit hazy about how exactly I block off the cavity without bridging the gap. If it were a tiny gap I could caulk it. As it is, it's actually an angled wall and so there will be some distance (not huge, but noticable) I'd really appreciate some clarity as to what exactly you mean.

is this the kind of thing?

Paul

Paulkent · Post by **Paulkent** » Fri Dec 23, 2005 12:57 am

I've dug an answer out from the forum.

I believ ethe answer is to extend the stud wall to almost touch the exterior wall. Then caulk the gap. That way it's airtight and I can Blast the Studs with Rockwool. Voila. The gap is airtight and I can just use a double leaf system.

Paul

cyeazel · Post by **cyeazel** » Fri Dec 23, 2005 1:53 am

How much airspace is there between your inner leaf framing and the concrete outer leaf wall? Also, do those drawings in your previous posts indicate that you have both sides of your wood stud wall covered with drywall or is just the inner side (interior of room) covered?

Paulkent · Post by **Paulkent** » Fri Dec 23, 2005 2:05 am

The inner wall is Panelled on the interior only.

The concrete wall is 30cm thick. The distance between Stud interior and the start of the Wall is approx. 4-6cm (it's splayed)

regards,

Paul

cyeazel · Post by **cyeazel** » Fri Dec 23, 2005 4:46 pm

I still think you should just use some cloth covered fiberboard (same as celotex or soundboard) for the gap between walls. Fiberboard is soft enough to not cause a vibrational bridge between outer and inner walls.

Post by **sharward** » Fri Dec 23, 2005 4:50 pm

Steve just wrote this in another thread on this very subject:

knightfly wrote: I'd recommend only fastening it solid on ONE side of a double framed wall, and letting the other side "float"...

bert Stoltenborg · Post by **bert Stoltenborg** » Fri Dec 23, 2005 8:31 pm

Steve's right

Paulkent · Post by **Paulkent** » Fri Dec 23, 2005 10:19 pm

cool.

thanks all.

I couldn't find the info in a search. But it's amazing how much you flounder around unless you know the right terms to search for..

Paul

Post by **sharward** » Sat Dec 24, 2005 1:52 am

...and the right techniques.

I've had lots of success using multiple search terms, activating the "Search for all terms" feature, sometimes using a particular author's name (if, for example, "I know 'so-and-so' said 'something' about that..."), and -- here's the key -- choosing the "Display results as: posts" option.

I sometimes feel like that grocery store clerk that knows instinctively that the potato chips are "on aisle nine" -- although to be honest I'm cheating behind the scenes with the search techniques I just described.