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Thread: SBs New Shed in Tasmania
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6th May 2016, 11:32 AM #46
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6th May 2016 11:32 AM # ADSGoogle Adsense Advertisement
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7th May 2016, 01:52 PM #47Power corrupts, absolute power means we can run a hell of alot of power tools
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7th May 2016, 04:53 PM #48
G'day SB, When we had the house re-roofed the builder added the the insulation blanket under the roofing sheets and the house was warmer in winter and cooler in summer...
I was told later that the blanket plus the original R2.5 batts give a thermal rating of 6......Cheers, crowie
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7th May 2016, 05:36 PM #49GOLD MEMBER
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You gents must have a different "R" system from us. My house, being built now, is going to have an R-80 ceiling with R-40 walls. The garage and "hobby room" above will be at least R-40 in the ceiling and R-20 walls. Vapour barrier on the inside of the insulation and All windows triple glazed. Hope we'll be comfortable at both seasonal extremes. -40C to 35C.
Pete
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7th May 2016, 05:46 PM #50
Your R values are based on Imp measurements and Fahrenheit, ours are metric (SI)
https://www.ecobob.co.nz/forum/topic...-formula-8053/
I don't think I have seen triple glazed windows in general use anywhere in Oz, double glazing is slowly being used but the uptake appears rather slow.
When we built our house 15 years ago, double glazing was the norm in most of Europe, when I went looking for it here most window manufacturers just shrugged their shoulders and weren't interested.
Also your standard stud size is 2x6 ours is 2x4, or 50x150 and 50x100mm (nominal 45x90mm)
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7th May 2016, 06:11 PM #51GOLD MEMBER
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Those dang yanks and their Fahrenheit stuff.
Believe it or not there are still areas on the West Coast building 2x4 exterior walls. Probably other places too. Double glazing is still more common too. It changes as the cost of energy increases.
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7th May 2016, 06:51 PM #52Power corrupts, absolute power means we can run a hell of alot of power tools
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8th May 2016, 12:57 PM #53
You are right, Pete.
To convert from the yankee imperial R-values to metric just divide by 5.67.
Thus, the r-values that you mention convert as follows:
- R=80 converts to 14.1,
- R=40 converts to 7.1 and
- R=20 converts to 3.5.
The German/Scandinavian passivhaus standard generally advocates Ceiling R=10, wall R=7 and floor R=5 with at least double glazing on all windows except those facing the north Pole where they must be triple glazed. Houses built to this standard use about 90% less heating/cooling than uninsulated houses.
Fair Winds
Graeme
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8th May 2016, 02:12 PM #54
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8th May 2016, 03:02 PM #55
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8th May 2016, 03:07 PM #56GOLD MEMBER
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8th May 2016, 03:55 PM #57
In Aus you don't need to and you can't without a lot of effort.
However QC Inspector is in Canada, where it gets really cold.
The coldest temperature recorded in Australia is -23 C at Charlotte Pass (29 June 1994). (Coldest recorded in Tassie is -13 C.)
These are mild in Canadian terms. This past winter has been unseasonably warm -- with highs of only -12 C where I am, and lows in the low 20s -- temps below -30 C are common. Somewhere around -40 C the authorities start closing the highways.regards from Alberta, Canada
ian
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8th May 2016, 04:01 PM #58
Simple, Cava; you don't!
Most batts have an insulation value of about R=0.7 per 25 mm (or inch), so to get R=7 then you need 250 mm of batts. Essentially, the house has to be designed and built to take sufficient insulation; it is usually very difficult or impossible to adequately retrofit sufficiently.
When I lived in Boston, USA, thirty years ago, the ceiling insulation in our house was about 400 mm thick! And they had just changed the framing rules for new houses so that wall studs went from 4x2 to 6x1½ inches, to allow greater thickness of insulation. A few new houses were then being built "double studded" thus allowing up to 12" of insulation.
Fair Winds
Graeme
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8th May 2016, 04:09 PM #59
Brave statement, Ian.
Depends on where you live. Some people actually chose to live in Canberra, Charlotte Pass and Miena. But you do need even more insulation in Canada.
Cheers
Graeme
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8th May 2016, 04:44 PM #60
the phrase was "you don't need to" -- in Canada if you choose not to insulate your dwelling you will find yourself climbing into the fridge to warm up. And needing to chip ice off the inside of the doors so you can open them.
One of the adjustments we had to make was to always carry full outdoor clothing when travelling in the car.
If you have to get out of the car when it's -25 (with another 10 degrees of windchill) frost bite is very close at hand.regards from Alberta, Canada
ian
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