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  1. #61
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    Quote Originally Posted by GraemeCook View Post
    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
    Wow those R ratinga are still killing ours

    Dave TTC
    Turning Wood Into Art

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  3. #62
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    Aug 2007
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    Saskatoon, SK, Canada.
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    Having better insulated homes would benefit you guys too. Your energy needs to cool the house would be much lower unless you're resistant to melting.

    Ian what part of the great white north are you living in? I lived all my life near Vancouver and moved here to Saskatoon last September. Fortunately we had a mild winter and got broken in gently.

    I also apologize for the thread derail.

  4. #63
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    Dec 2010
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    Quote Originally Posted by GraemeCook View Post
    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
    Fortunately, we will be building a new house, and I have been toying with the double stud arrangement on the outer walls.

    Like all things, budgetry consideration comes into the equation - we shall have to see.

  5. #64
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    Quote Originally Posted by cava View Post
    Fortunately, we will be building a new house, and I have been toying with the double stud arrangement on the outer walls.

    Like all things, budgetry consideration comes into the equation - we shall have to see.
    in Australia the extra dollars are nearly always better invested in wider eaves rather than thicker wall insulation. If you can keep the sun off the walls and windows, especially the west facing ones, the solar heat load is greatly reduced. even external blinds or security shutters can make a significant difference to the solar heat load.
    regards from Alberta, Canada

    ian

  6. #65
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    Apr 2006
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    Hobart
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    Quote Originally Posted by cava View Post
    Fortunately, we will be building a new house, and I have been toying with the double stud arrangement on the outer walls.

    Like all things, budgetry consideration comes into the equation - we shall have to see.

    Hi Cava

    While you are in the information gathering/dreaming/doodling phase for you new house you might like to do some googling on the European passivhaus concept. I have seen estimates that they increase building costs in Australia by 5-10%, but if that reduces heating and cooling costs by 90% then the payback period should be quite short. Shorter if energy costs continue to rise.

    Just a thought.


    Cheers

    Graeme

  7. #66
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    Quote Originally Posted by ian View Post
    in Australia the extra dollars are nearly always better invested in wider eaves rather than thicker wall insulation. .......
    Ian, he is in Melbourne!!!



    Cheers

    Graeme

  8. #67
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    Quote Originally Posted by GraemeCook View Post
    Ian, he is in Melbourne!!!
    Further to that, I believe in the not too distant future, we will be entering a cooling cycle as opposed to the touted 'global warming' meme. We shall see.

    Sorry for derailing the thread SB.

  9. #68
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    Quote Originally Posted by GraemeCook View Post
    Ian, he is in Melbourne!!!
    I know

    what I'm alluding to is that US / European insulation standards, building codes and products are designed to deal with a temperature gradient between the inside and outside of a dwelling that is in the order of 40 to 60 degrees C (-25 outside, +25 inside = 50 degrees difference)
    Even in Melbourne the temperature gradient will rarely be greater than about 20 to 25 degrees.

    If I were an insulation salesperson or builder I'd happily sell you more insulation (think the "rinse and repeat" mantra to sell additional hair shampoo) but will the customer ever recover the increased costs in energy savings, especially if they team teh additional insulation with roof top solar.
    regards from Alberta, Canada

    ian

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