Page 2 of 2 FirstFirst 12
Results 14 to 19 of 19
  1. #14
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    7,011
    Post Likes
    Quote Originally Posted by momoformula70 View Post
    This is interesting.
    Just for the record where is your house located?
    On slab or crawlspace foundation?
    How is it insulated?
    Was everything caulked to seal it up from base-plate to between all studs?
    How big is your house?
    Conditioned or unconditioned attic?
    Backdraft dampers on all exhaust fans? Including range hood? And what kind of damper do you use!? one that is better than what comes with most fans or just the stock backdraft dampers?! (On this note I found out yesterday that my range hood vent does not have any back draft damper installed at all. It is a 6" metal duct vented to the outside.) So when I run my bathroom fans the 6" duct is acting like a passive inlet for air. I will get a back draft damper installed for sure!!

    In the summer down here in Mobile AL the smell in my attic and house is stronger. Which seems to indicate that the foam is off-gassing more in a humid hot climate or it is like you said, that the house is getting more 'natural uncontrolled ventilation on colder dryer days'.

    This is starting to drive me nuts! I don't want to live in a house with unhealthy indoor air quality because of off gassing from foam insulation or other building materials.. I wonder were one can get proper testing of the air done without it costing an arm and a leg!?
    This is a 35 yr. old 2,200 sqft. house located in Madison WI.
    Has 1" of rigid foam on the outside under cider siding. 2"X4" with fiberglass/vapor barrier/drywall. The attic is vented with 12" blown celluous. The home is air tight with estimated .2 ACH at average winter conditions (17^F, 7.5 mph wind). The house has a full basement with part finished.
    Your nose a good sensor for some pollutants. Better than most gadgets that are available for home testing. Outgasing of pollutants decline with time. Most foams are safe with adequate ventilation rates. Most homes with normal indoor materials with an air change in 4-5 hours have low levels of pollutants. Try to stay objective.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  2. #15
    Join Date
    Feb 2011
    Posts
    27
    Post Likes
    interesting read on classification of indoor and out door air quality in europe.
    See chart of classification of indoor Co2 levels..

    http://www.camfilfarr.se/Global/Docu...lity_EN-GB.pdf

  3. #16
    Join Date
    Nov 2014
    Location
    New Port Richey, Florida, United States
    Posts
    16
    Post Likes
    I am experiencing the same thing and am now faced with having to have a dehumidifier/ventelator as well but I am a single mom and have very little idea what I should have installed. An reading these old posts to try and learn as much as I can or I could end up paying and not having the problem solved as well. Ugh...

  4. #17
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    7,011
    Post Likes
    The Camfilfarr are reasonable except the %RH recommendation of +70%RH. Most suggest max of 60%RH as a max for extended time. A/c cycle of +80% RH in the supply duct is exceptable but should dried out everyday for several hours to avoid mold/bacteria. They made no comment on fresh air change, but should be an air change in 4-5 hours when occupied. Otherwise OK.
    All green grass climates will need supplemental dehumidification to avoid mold and dust mites.
    A small whole house dehumidifier with the fresh air ventilation/merv 11 air filter like the Ultra-Aire 70H will handle upto a 2,500 sqft home. For the highest efficiency consider the Ultra-Aire XT105H. Add the DEH 3000 controller with an electric fresh air damper to provide a specific amount of filtered fresh air when occupied.
    Keep us posted on any questions and results.
    I have been involved with this for 20 years and you are the right track.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  5. #18
    Join Date
    Nov 2014
    Location
    New Port Richey, Florida, United States
    Posts
    16
    Post Likes
    Hi Teddy, I just heard from my HVAC guy and he recommends the DR90 for my place and I love the price a lot better than the Ultra-Aire 70H. I think I'll go with the Honeywell because I'm tight for money. Do you think this will take care of not just dehumidifying my home, but bring in sufficient fresh air as well. Because my house is tight, I really need to be sure it brings in sufficient ventilation/fresh air.

  6. #19
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    7,011
    Post Likes
    Great. I hope you got a good contractor. It is in his hands. A fresh air change in 4-5 hours when occupied and maintain 50%RH should keep you comfortable and the indoor air quality high.
    Keep us posted on the results.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.
Quality Home Comfort Awards