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Weil McLain GV Gold

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cowie
cowie Member Posts: 8
in THE MAIN WALL
When piping 3"Z-Flex vent and 3"PVC air intake through a foundation wall (concrete) what can I use to seal around the piping? Will cement harm the stainless steel? I thought of cement or sillicone however the space is rather large for sillicone.
Any help or thoughts are appreciated.
Cowie

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  • jim f
    jim f Member Posts: 182
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    mineral wool is a good coice for high heat applications
  • Unknown
    Unknown
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    Different companies

    that make the vent pipe make a wall thimble for going through the wall. If it is Z Flex I have a catalog at my training center I can get you some info on Monday.
  • Michael B
    Michael B Member Posts: 179
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    the supplier

    who sold you the boilers and/or stainless steel should carry wall thimble's for this application.
  • hot_rod
    hot_rod Member Posts: 22,189
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    You still need to seal

    around the thimble to waterproof it through a side wall application. Silicone would work. Also tile supply stores have colored silicone selection and some with sand mixed in to blend with the concrete or mortar.

    For sealing directly against the stainless I have used RTV silicone, same as the stuff used to seal the joints on some brands od AL-29. Automotive supply places have it in grey color, if the red doesn't fit your decor!

    hot rod

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