Homeowner Forum / Construction / December 2003

I think I would create a sleeve through the wall.  A short piece of PVC,
copper,  or iron pipe that is large enough to slide the 1/2 black iron
through.  Use a hole saw to cut a clean hole through the metal siding that
is a caulkable fit.  Position the sleeve next to a stud/steel frame member
or add one to fasten the sleeve to.  There are many one and two eared pipe
strapping clamps in the electrical department that would be appropriate.  to
take the pressure off the sleeve, I would rig a drip leg on the gas line on
one side or the other of the penetration.  This would consist of a T fitting
pointed down with an extra length of pipe and a cap resting on the floor.
The drip leg is standard practice.  I am anti silicone, so I would caulk it
with NP1 where the sleeve penetrates the siding. Install backer rod around
the black pipe inside the sleeve, caulk for weather seal.  The NP1 and
backer rod will provide plenty of movement for thermal expansion and will
make an excellent long term weather seal.

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Keep the whole world singing. . . .
DanG

have a hole there to put the pipe through, I was wondering if anyone has a
recommendation for how to secure the pipe so that it doesn't just slide back
and forth there with the wall, and that the wall can somehow have a tight
seal around the pipe and that there wont be rubbing (I'd like to avoid the
friction and the noise).

here's a link to 3M
http://www.3m.com/us/arch_construct/firestop/catalog.jhtml

have a hole there to put the pipe through, I was wondering if anyone has a
recommendation for how to secure the pipe so that it doesn't just slide back
and forth there with the wall, and that the wall can somehow have a tight
seal around the pipe and that there wont be rubbing (I'd like to avoid the
friction and the noise).

You might want to try taking a short piece of pipe to a local car dealer and
see if they have a rubber grommet that will fit the O.D. of the pipe.

Grommets used in cars for routing wires and pipes usually have a U-shaped
groove in the edge into which the metal of the chassis sits. That way the
grommet doesn't pop out of the hole when the car vibrates after slamming
into pothole after pothole. It should stand up fine in your application and
prevent rubbing noise as the iron pipe and the metal siding expand/contract
at different rates