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Thread: Frozen pipes...help

  1. #1
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    Frozen pipes...help

    My bathroom is above my garage. The water pipes have frozen and I'd like to have the ceiling in the garage better insulated. I'm getting conflicting information:

    Some say to insulate the ceiling below the pipes so that the pipes retain the heat from the interior of the house.

    Others say this is hogwash, and that heat rises, and that the best (for a finished ceiling) is to blow in cellulose and block all air movemement, thereby insulating the pipes from everything.

    Thoughts from the experts?

    I'm also planning to install a 220v electric heater as extra insurance (excuse to run 220 to my garage for some tools).

  2. #2
    1. Your first priority is to make sure the pipes haven't burst from the freezing and if so, turn off the water supply so that you can mitigate the ensuing water damage.

    2. If you keep your garage heated, don't insulate the ceiling. If you don't, insulate!


  3. #3
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    Insulate below the pipes. You want them protected from the cold garage environment. Question: do your floors feel cold in the space above the garage? If so, they are not very well insulated. If they feel warm and your pipes are freezing, then the pipes are exposed too much and not getting any beneficial heat loss through the floor to keep your pipes from freezing.

  4. #4
    One of the best insulations for pipes is the type made of closed cell foam which slips around a pipe. These typically come in 6 foot or 8 foot lengths. The most common color is a light gray. You slip them over the pipe and then use duct tape along the seam which runs the length of the insulation. I also used them at one time to insulate cold water pipes in my basement to prevent condensation drips during the summer months. After using the pipe insulation you can then add further insurance by using fiberglass in between the floor joists.
    Dave Anderson

    Chester, NH

  5. #5
    Had idiots for clients that left a basement window open for the cat. Every pipe froze and burst leaving me with 7 inches of water on the floor. If you need to replace the pipes, use pex with the crimps. It can take some freezing without bursting. Insulate the pipes from any cold source. Above, below or to the side. If heat from the house gets to the pipes, fine. If they are isolated from the heat, nothing will help stop freezing, but might delay it. Leave the fixtures drip in suc cold, the constant supply of water helps prevent freezing.

  6. #6
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    Thanks, guys. The contractors are telling me they suggest blow-in insulation from below. Least invasive, and effective. I am inclined to do that. Anyone have experience?

    I've also heard that the reason this happens over time is that batt insulation settles opening up space to above it which will then be exposed to an uninsulated wall. Blow in will fill the space and prevent this.

    I have foam around the pipes. It has not helped. Pipes burst once. I don't mind spending the money to mitigate the problem and make the upstairs space more comfortable, but I want to be smart about it.

  7. #7
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    Hot air rises over colder air, but heat flows from warm to cold. Heat does not rise. Blow in should be some better, but may still not be enough. For an upstairs bathroom that we seldom use, I plumbed it so the pipes can be drained. For any cutoff, or bypass, I like quarter turn ball valves better than the old washer type.

  8. #8
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    Quote Originally Posted by Tom M King View Post
    Hot air rises over colder air, but heat flows from warm to cold. Heat does not rise. Blow in should be some better, but may still not be enough. For an upstairs bathroom that we seldom use, I plumbed it so the pipes can be drained. For any cutoff, or bypass, I like quarter turn ball valves better than the old washer type.
    This is one of the reasons I suggested insulation BELOW the pipes. Insulating around the pipes might be less effective. Another idea is to install heating wires on the pipes. These have a built in temperature sensor and only turn on the heat if the temperature is below 37F or something like that. I installed these at my cabin and they have been beneficial in preventing frozen pipes. These heat tapes come in various lengths and they don't suck a lot of current as I recall. Insulating with the heat tape might be the ticket for you.

  9. #9
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    Assuming an unheated garage, I'd insulate the ceiling below the pipes, shooting for R21 or better -- 4" of polyiso foam, or 6" of EPS. Insulation just slows the passage of heat , doesn't stop it so your perfectly insulated space will eventually equilibrate to below freezing. In a worst case scenario I'd cut a floor register into the space from above to provide some conditioned air circulation into the bay with the pipes.

  10. #10
    A couple years ago during a cold spell, I had a pipe freeze although did not burst. It was in the basement above a insulated ceiling tile. I pulled the tile for access, the pipe was wrapped with fiberglass which evidently didn't quite do the job. Ironically the line was not along outer edge of house, it was between second and third joist in. I stuck a fan under the tile opening and tilted it upwards, I open up a ceiling register nearby to create a warmer area near the opening and after 1/2 hour the water started to flow.
    After the cold spell, I closed the tile although anytime it gets down to single digits, I open it. Good luck.

    Mac

  11. #11
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    Quote Originally Posted by Mac McQuinn View Post
    A couple years ago during a cold spell, I had a pipe freeze although did not burst. It was in the basement above a insulated ceiling tile. I pulled the tile for access, the pipe was wrapped with fiberglass which evidently didn't quite do the job. Ironically the line was not along outer edge of house, it was between second and third joist in. I stuck a fan under the tile opening and tilted it upwards, I open up a ceiling register nearby to create a warmer area near the opening and after 1/2 hour the water started to flow.
    After the cold spell, I closed the tile although anytime it gets down to single digits, I open it. Good luck.

    Mac
    Why not replace the tile with a piece of egg crate to let the heat go up

  12. #12
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    I would open it up and take a look. the pipe could be run very close to the ceiling with no room for insulation to go under it. if this is the case it should not be too hard to re-plumb that section with PEX and move it up closer to the floor. blown in will be better than batts nearly every time and in every situation.

  13. #13
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    Quote Originally Posted by Prashun Patel View Post
    Thanks, guys. The contractors are telling me they suggest blow-in insulation from below. Least invasive, and effective. I am inclined to do that. Anyone have experience?

    I've also heard that the reason this happens over time is that batt insulation settles opening up space to above it which will then be exposed to an uninsulated wall. Blow in will fill the space and prevent this.

    I have foam around the pipes. It has not helped. Pipes burst once. I don't mind spending the money to mitigate the problem and make the upstairs space more comfortable, but I want to be smart about it.
    I've used the BIBS (Blown In Blanket System) insulation system throughout my house & highly recommend it. I used to think my previous 4 homes were well insulated, but definitely not well as this. Its fragmented fiberglass insulation mixed with a vapor adhesive that allows it to stick to everything, especially around piping, outlet boxes, etc. The adhesive allows it to hold onto walls, rafters & does not sag like the batts do.
    "The BIBS system is a high performance insulation system that forms a seamless blanket of dense-packed fiberglass insulation that completely fills around pipes, wires and other objects inside the cavity to maximize thermal efficiency. This unique process helps eliminate costly voids and air gaps, saving you heating and cooling energy. The BIBS system provides you with the highest, full cavity effective R-values attainable on the market today."
    http://www.bibs.com/overview/faqs/#toggle-id-1
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  14. #14
    Why not insulate the garage instead?

  15. #15
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    Quote Originally Posted by Tom M King View Post
    Hot air rises over colder air, but heat flows from warm to cold. Heat does not rise. Blow in should be some better, but may still not be enough. For an upstairs bathroom that we seldom use, I plumbed it so the pipes can be drained. For any cutoff, or bypass, I like quarter turn ball valves better than the old washer type.
    I second Tim's opinion on ball valves. I never use anything else.

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