Spray Foam Insulation for Vented Porch Crawlspace??

Discussion in 'Remodel Forum & Blog' started by bjferri, Oct 26, 2009.

  1. bjferri

    bjferri DoD Army

    Messages:
    150
    Location:
    Maryland
    Is this a good idea?

    Joists are presently too far apart to use standard fiberglass insulation, I'd have to 2X4 sections to create the 16". I see the pro's but my only con is:

    I don't like the idea of insulating over the wires that run between joists. What if in the future I need access to those wires? Is this a justifiable concern? Are there any other concerns?

    Thanks in advance...

    An Afterthought: If I use regular insulation, would the vapor barrier face up, or down towards the ground. I can cut the bats to fit the 22" runs and staple them up with another material like the thin paper like aluminum insulation...just a thought.
    Last edited: Oct 26, 2009
  2. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    You could use polystyrene (or similiar) panels. Little adhesive or button Kap nails to keep it up.

    If you need to access wire, just abandon it and run new wire.
  3. bjferri

    bjferri DoD Army

    Messages:
    150
    Location:
    Maryland
    That's an idea! I didn't think of that. Can you read what I just added and tell me if that's a good idea as an alternative? The wire is new - I still don't like the idea of covering it.
    Last edited: Oct 26, 2009
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,932
    Location:
    New England
    WIres and pipes get covered by insulation all of the time. Now, depending on where they are and the thickness of the insulation you are adding, can complicate things. Fiberglass doesn't work well if it is compressed, so the best thing to do is split the insulation so the things can be embedded without compressing it.

    Normally, you'd have the vapor barrier towards the living space in the colder climates where heating is more common than cooling.

    If this is in a dirt floor crawl space, you probably want to put some plastic on the ground to slow moisture from that coming up. You can tape it to the foundation walls to create a seal as well.
  5. bjferri

    bjferri DoD Army

    Messages:
    150
    Location:
    Maryland
    Thank you - I cancelled the spray foam insulation guy. I’ll just do it myself with fiberglass. Thanks for tips / suggestions.
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