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Old 08-13-2017, 01:50 PM   #1
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tile backer board and torch


I need to repair the water lines in the wall of my tub/shower. Two lines are very close to the tile concrete boards. How much heat can this concrete board take and any suggestions on protecting the stud and other areas? I have done copper sweating before but never in an enclosed area as this. My 1st purchase will be a fire extinguisher.
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Old 08-13-2017, 02:44 PM   #2
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Re: tile backer board and torch


It won't be so much the CBU, as it is fireproof for the most part (it's concrete), BUT the tile attached to it may crack due to the heat. I would purchase the fire extinguisher, PLUS a heat pad. http://www.homedepot.com/p/9-in-x-12...4002/100345508
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Old 08-13-2017, 06:26 PM   #3
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Re: tile backer board and torch


Thanks for the fire pad link.
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Old 08-13-2017, 10:59 PM   #4
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Re: tile backer board and torch


I would still protect the concrete from heat as it can explode
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Old 08-14-2017, 06:45 AM   #5
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Re: tile backer board and torch


A piece of aluminum foil folded about four times makes a nice heat shield. Tacked to stud with thumb tack. Assuming that you are soldering 1/2 copper it shouldn't take but about 30 seconds of heating each joint.

What kind of a torch are you using?

You didn't ask, but you don't engulf the pipe or fitting (you always heat the fitting) in the flame. Apply the tip of the flame to the joint. The tip of the blue flame with in the yellow flame is the hottest point.

Have a bucket of water and wet cloths handy.
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Old 08-14-2017, 10:07 AM   #6
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Re: tile backer board and torch


in all of my previous sweats, I've always used a propane torch. Total sweats? maybe 20-30. Never any leaks. . My concerns about this project are the very small access area and the close proximity of flammables. After the fire extinguisher purchase, the next will be an instant on/off self igniting torch head. The last thing I need is a full flame going in circles in a confined area while I'm trying to cut it off. Thanks for all the shielding advice.
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