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  1. #1
    heatseeker Guest

    Losing alot of heat in crawlspace

    I,m losing a lot heat under a crawlspace. There's no insulation, and the supplies are metal vent pipes. Would you insulate the existing metal supplies or replace them with flex duct supplies? Maybe insulate the crawlspace?

  2. #2
    Join Date
    Sep 2006
    Posts
    1,253
    Quote Originally Posted by heatseeker View Post
    I,m losing a lot heat under a crawlspace. There's no insulation, and the supplies are metal vent pipes. Would you insulate the existing metal supplies or replace them with flex duct supplies? Maybe insulate the crawlspace?
    Probably should do both. Sealing and insulating the crawl space is the best thing to do. Depending on where you are located, you may have very high levels of humidity in the space in the summer months. Anything over about 50 - 55% relative humidity in the space will promote mold and wood rot.

    If insulating the crawl space walls is difficult, consider using spray foam. It will seal and insulate in one step. Installing a dehumidifier will be of great help too.

    Keep your metal ducts as they flow air with less restriction, but you will be better off with them insulated. Even with the crawl space sealed and insulated you will be giving off heat/cool from uninsulated ducts and causing your system to have longer run times to heat and cool your home. Insulating the ducts is a one time expense that you will benefit from everyday.

  3. #3
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,360
    Plastic on the earth, close the vents to the outside all year. Insulate the exterior walls with aluminum faced foam. You will get very gain from insulting the ducts. Do not insulate the ducts, the heat lose from the ducts moves up through the home. A good dehu in the crawlspace will help the whole be drier during the summer. Check out the Santa Fe Compact or Advance for durable high eff. dehu. thermastor. com 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"

  4. #4
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
    Posts
    1,582
    I would insulate your duct work, lay a vapor barrier on the floor of the crawl space, and insulate the walls and the floor above the crawl space should give you great results and lower you heat loss in that room above the area. When you but the vapor barrier on the floor make sure to seal the permiter of the vapor barrier to the base of the crawl space walls completly so there's no chance of any radon or humidity to get up thru the barrier, infact you can apply the vapor barrier along the floor and go up along the walls and then seal at the top of the walls is a better option and if your going to use more than one piece of barrier be sure to seal and joints with a good tape like tyvek tape use on house wrap is a tape that sticks to anything and sticks very well.

  5. #5
    heatseeker Guest

    Thumbs up reply to heatloss in crawl

    Thanks DanW13, teddybear, and mcchild all good advice on heatloss in crawlspace.

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