New dryer vent moisture

REP

My best guess is that the vent dosen't go all the way to the outside vent hood,or there is a big tear in that corregated vent pipe behind the wall where it gets hot. That needs to be fixed or it will cause mold and/or wood rot.

n0c7

Turns out they did not tape up any of the joints at the 90 degree elbow causing air leakage in and around the bottom plate and drywall opening. Air flow is fine, this is a new home without any blockages and I verified that nothing was disconnected when I opened up the wall.

Unrelated to the actual moisture issue, someone did puncture the washer drain with a drywall screw but luckily the screw was holding the water back. They also managed to damage the black wire of the 220V plug for the dryer as well as cut out a stud to make room for the washer drain.

Gotta love the surprises in brand new homes. All fixed..

gregzoll

That is why I always double check and take time doing something. No need to rush. At least you hopefully got a lot of problems nipped in the bud, and there are no others to be found. Keep your fingers crossed.

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COLDIRON

You really should get rid of that flex hose and run solid 4" metal pipe.

Too many lint traps.

n0c7

I'm on the fence about the flex hoses. A solid pipe gives people false piece of mind and the assume they do not need to clean it out(not to mention difficult to connect in tight spaces) compared to someone who regularly cleans the flex out every year or two. 90 degree elbows still trap plenty of lint regardless of hose type.

Michael Thomas

Look for something like this:

Attached Thumbnails

 

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Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
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n0c7

Checked for that outside, thanks!

COLDIRON

See that vent the guy is holding in Michaels picture that is wrong, that end that is showing should not be crimped it should be rounded and the piece in the house going to the out side should slide into that. Someone hand crimped that to make it fit. When you install dryer pipe you always install it in the direction of air flow from the dryer to the outside all the way from the connection on the dryer. That way no lint traps, well I can't say no lint but very little. And never use screws because they catch lint.

If you're on the fence you shouldn't be there are no false positives here it's fact no matter what material people use they should check their dryer once in a while. Just like anything else, oil, furnace filter, lint filter, air pressure in tires false positives no laziness and incompetence yes.

NOTE: No flex on dryer lines, buy a pair of tin snipes and a roll of metal tape.

Michael Thomas

COLDIRON is correct, per the IRC dryer vents must be installed wither with their joints running in the direction of air flow (the upstream section insert into the downstream) section, the correct part looks like this:



However, that the vent termination is not a field modification, it was manufactured that way:




and the fact that installing it would be both a code violation and a safety hazard does not stop major home improvement centers from selling them.

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Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
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