Dryer vent installation/code

[adelphospro]

I recently purchased a 1956 home and have begun some of the work to modernize the guts a bit. One of the first things I've done is modified the old pantry (8' by 4' space - small!), which had the water lines, to include a dryer vent to the outside.

I've read up on the ICC standards for dryer vents and I believe I did the work correctly, but would greatly appreciate anyone flagging me if I missed anything...

I live in SC and the codes for my local county made very little changes to the ICC standard regarding dryer vents. I have considered the following:

1. Dryer vent vents to the outside of the home. The siding is painted cedar shingles - the vent was installed directly into one of the shingles (4 1/8" cut). No obstructions within the wall within 6" of the vent pipe. I cut through the shingle, a layer of house wrap, and plywood, then the drywall. No insulation was found within the wall
2. Total length of the stiff pipe is about 8"
3. The vent is about 2-3' above the ground
4. Backdraft damper was installed within the home where the vent opens into the room
5. No windows or openings are within 3' of the cut
6. About 1' below the vent some cable from the cable company is stabled against the shingles
7. I used water and weather proof caulk outside and inside

I had made a minor mistake in my original cut that left about 1/2" gap on one side of the hole. I caulked around this gap and it is completely covered by the vent cap.

From inside the home I can see light from the pipe, but no light around the cut.

This is my first project actually cutting a hole in an external wall, so I am naturally thinking a lot about what I'm doing. Thank you!

[shuellmi]

No insulation?

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[rothwem]

No insulation?

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I've got a 1951 home and I'm also in the 0 insulation camp.  The only reason my electrical bills aren't insane is that my place is only 720 square feet. 

Oh, and I did almost the exact same thing when I did my dryer vent, although I was much less cautious.  I slowly hole-sawed the plaster to make sure there were no wires or pipes where I wanted to cut my hole, then I went from the outside and hole-sawed the siding from the other direction, after I had drilled a pilot hole from the inside in the siding. 

[Koogie]

You don't say if the dryer is electric or gas.  I suspect electric ?      If gas, all the pipes have to rigid (non of that flexible shit) and sealed.  That seems to be the case in the code for a lot of places anyway.

[adelphospro]

Nice. Then I'm not too worried. It's electric - there's a gas line in the street but not to the house. That's another project for down the road :D

Yeah no insulation in that room... it's pretty tiny, though, with no HVAC access into the room.

I'm planning to build out the room (currently 8' x 4') and the connected screened in porch and turn it into an 8' by 12' mudroom. When I do that, I'll insulate the walls and replace the copper washer pipes with PEX. For now we just keep the door to that room closed and everybody's happy.