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Type: Posts; User: RJordan

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    Re: Insulation Question

    As a foam contractor in MA, I am partial to foam.
    Foam will probably not seal out critters. That is a separate issue to deal with. You mention a need to dehumidify. That needs to be addressed also....
  2. Re: Renovating 3rd flr Cape Cod - insulation/airflow question

    I gather there is existing sheetrock you are not taking down. I have done a combo installation where a cellulose contractor packed cellulose into the enclosed cavity and we foamed the exposed rafters...
  3. Re: National Energy Audit - second opinion request

    Hot air rises and usually the most heat loss is through the ceiling. The problem is air leakage. Fiberglass does not stop air leakage. Adding more fiberglass will not help you. A radiant barrier...
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    Re: Insulating around Water Heater exhaust pipe

    I was assuming the code approved pipe was being used, as crabber recommends. I would still want 2 inches of fire rated material separating the pipe from combustibles.
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    Re: negative house pressure

    If you are drawing air down the chimney, you are backdrafting the chimney. This is a very serious situation. Backdrafting the furnace or water heater can bring carbon monoxide into the house. It is...
  6. Thread: How Many CFM?

    by RJordan
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    Re: How Many CFM?

    When fans are rated they are tested with a 6 foot piece of straight duct. When longer duct runs are used and fittings, the capacity is reduced substantially.
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    Re: Insulating around Water Heater exhaust pipe

    No. Use a fire rated product like Therma-fiber.
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    Re: Covering Closed-Cell foam required?

    Garages are required to have fire rated sheetrock (5/8 inch) on the walls and ceiling separating it from the house. Otherwise, the foam needs to be covered by 1/2 inch sheetrock. The code allows an...
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    Re: Sound prevention interior rooms of house

    I have tried using fiberglass for sound insulation and it just doesn't work. Spray foam, especially open cell works great. It will be quite expensive to install foam solely for sound proofing, apart...
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    Re: What to use for vapor barrier?

    Sorry for our quibbling over semantics. The final arbiter is your building official. My opinion is that you do not need to put anything on the foam. Moisture movement into walls is mostly brought by...
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    Re: What to use for vapor barrier?

    I hope I'm not getting everyone confused by now as I have gotten myself all twisted up. I agree with everything in your last post. Most building codes call for a vapor barrier when, we both agree,...
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    Re: What to use for vapor barrier?

    The residential code refers to the need to have a vapor retarder, and that is why I used retarder rather than barrier. Building scientists distinguish between retarder (preferred) from barrier as...
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    Re: Insulation Help

    A 5% void in insulation results in a 50% reduction in effectiveness of insulation. You need to seal every penetration into the attic before adding any insulation as air infiltration is a significant...
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    Re: What to use for vapor barrier?

    Is the vapor barrier required by code? You want your wall to be able to dry to one side. In most cases the plywood ,OSB and housewrap will be a vapor barrier on the outside. Which is to say you want...
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    Re: Spray Foam vs. Blown-in attic insulation

    As a spray foam contractor, I believe it is the best solution. The problem you are trying to solve is to keep heat from migrating into the attic. A lot of your heat loss is from hot air rising into...
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    Re: Noisiest Ceiling Ever - Help!

    It isn't very practical to inject foam. Sound is transmitted either through the air or by vibration through material. Dense packing cellulose in the cavity will most likely reduce the sound...
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    Re: sagging wall insulation

    You need to do what is called dense pack cellulose. It involves inserting a small diameter hose, like a 1 inch diameter attached to the 2 inch diameter hose from the machine, all the way into the...
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    Re: how seal floor boots

    You've got me there. I still have what came with the house.
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    Re: how seal floor boots

    You should set ASHRAE, ACCA and the ICC staight on this as they have it wrong too. At least according to you.
  20. Re: How do you insulate an original 72 year old mansard roof?

    I think your situation is more complex than can be resolved by well intentioned speculation you will get here. You have a wonderful organizatioon in Canada at CMHC, Canada Mortgage and Housing...
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    Re: how seal floor boots

    I would bet a lot of money the AC is oversized by a lot, and I don't gamble.
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    Re: Flip the attic insulation?

    If you take Building Performance Institute training or attend conferences like Affordable Comfort, everyone stresses the need to stop air infiltration by sealing before adding cellulose.
  23. Re: Where do you find the right contractor for Updating?

    You ought to try this company. http://www.recurve.com/contact/
    They are in SF. I met Robert Mitchell a few tears ago. They will set you right.
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    Re: how seal floor boots

    I never said it should run 24/7. Manual J says to design for the temperature that is exceeded 1% of the time. In my Boston climate I should design heating for 2 degrees. If equipment was sized by...
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    Re: Ventilation: Balanced vs Supply

    Whether it would work depends on how leaky the house is. In a really tight house, probably not. If it wouldn't work, how would a bath fan work or a kitchen exhaust fan or a dryer? They all need to...
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