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Insulation In The Walls - External And Internal Kristina and I decided early on in our careers as environmentally friendly consultants, that installing insulation in the internal walls made perfect sense. The additional cost is minimal. The results are dramatic! 
In the photo above Kristina is in our master bedroom. On the LHS where the bi-folding windows are this is obviously an external wall (yes my MBA taught me something - but just not that observation...), anyway, where was I - oh yes, she is ripping the GreenStuf insulation from Autex Industries to finish off stuffing any gap she can fill. Behind her is the internal wall between our bedroom and the middle bedroom of the house. We wanted to obviously dampen any noise made in either room so it was not transmitted into the other room(s). 
Here you can see why I married Kristina - she is so darn HOT! (and not just from ripping and installing insulation! Now this is either taken on a different day, (hence the change of clothes), or ??? There is no other reason - this is one practical woman - one of the other reasons I married her! And the reason she didn't insulate the section of the wall behind her in the previous photo (or this photo?) - cause an inspector needed to come to check we had used plywood on the wall to make it rigid! (See you thought I was just an electrician!) One of the keys to installing insulation is to make sure you don't leave ANY gaps, and to ensure it doesn't slump (a couple of well placed staples in the top of each pad does the trick) throughout the life of the house. So Kristina is inspecting each pad in this photo. We were absolutely 'anal' with this! 
In addition, we gave the builders (and us as I took 6 months off work to build / wire / plumb the house with the team of subbies) a massive headache by using the same thickness insulation as you would use in Dunedin or Invercargill (i.e. in areas where the snow line is). This made putting the gib on a nightmare sometimes - but we were determined to have the 'R' rating as high as possible to minimise the amount of heating required to keep the place warm in those cold winter months (well we think they are cold!)...
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