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Message
Ductwork condensating throughout attic
Posted on 7/27/20 at 3:01 pm
Posted on 7/27/20 at 3:01 pm
Looking for recs on someone that can either reinsulate old hard pipe ductwork in attic or replace with new flex if that’s a better option. Ductwork is approx 35 years old and insulation is sagging and leaking condensation on ceilings in several spots. In Baton Rouge
9
Posted on 7/27/20 at 3:32 pm to DzNtz
Following this... Had local company give me a quote for 12 new drops of flex and a new plenum for >$3500 I want to say. Only 2 of them are real bad and some of them run long distances around the house that don't seem to need replacing.
Posted on 7/27/20 at 3:46 pm to DzNtz
First check for air leaks if no leaks. I bought insulation for duct foil outside and wrapped and stapled the old duct.
Posted on 7/27/20 at 3:50 pm to easy1234
quote:
bought insulation for duct foil outside and wrapped and stapled the old duct.
I did the same thing, patched some obvious spots where there were gaps in the insulation Friday night but it hasn't been hot enough for the problem to show back up recently.
Posted on 7/27/20 at 3:57 pm to DzNtz
No way I would replace hard duct with flex crap.
Have it re taped Sealed and insulated
Have it re taped Sealed and insulated
Posted on 7/27/20 at 4:47 pm to DzNtz
I think I would also be inclined to keep the rigid ducts if they are sized properly and not in to bad of shape not because flex ducts are bad but they often seem to be installed improperly with many kinks/bends, etc that restrict air flow, but then that should not be an issue with a good installer.
But as Cracker recommends, I would have a duct blast test performed to check for air leakage, have all leaks properly sealed with HVAC mastic and then insulated with R-8, unless it’s best to go the flex duct route. Sounds to me you have duct leakage if you have sagging and dripping duct insulation.
Someone I know with knowledge of this general subject recently suggested this firm to me Entergis in BR as a company to consider as I also want to have my HVAC ducts and house envelope checked for air leakage prior to HVAC replacement but I haven’t reached out to them yet.
I’ll also be following to see what, and who, others might recommend.
But as Cracker recommends, I would have a duct blast test performed to check for air leakage, have all leaks properly sealed with HVAC mastic and then insulated with R-8, unless it’s best to go the flex duct route. Sounds to me you have duct leakage if you have sagging and dripping duct insulation.
Someone I know with knowledge of this general subject recently suggested this firm to me Entergis in BR as a company to consider as I also want to have my HVAC ducts and house envelope checked for air leakage prior to HVAC replacement but I haven’t reached out to them yet.
I’ll also be following to see what, and who, others might recommend.
This post was edited on 7/28/20 at 8:49 am
Posted on 7/27/20 at 5:44 pm to DzNtz
all the comments are good but double check your power vent fan is working, check the simple stuff first.
that said, making sure things are well insulated is never a wasted effort but you gotta remember to do it in winter time when its not 150 degrees up there like it is now. since we have rainy conditions all week try going up there after midnight and it shouldnt be any hotter then 90 degrees
that said, making sure things are well insulated is never a wasted effort but you gotta remember to do it in winter time when its not 150 degrees up there like it is now. since we have rainy conditions all week try going up there after midnight and it shouldnt be any hotter then 90 degrees
Posted on 7/27/20 at 6:03 pm to DzNtz
Wait till November and do yourself
Posted on 7/28/20 at 8:14 am to Hamma1122
Having the same problem in Baton Rouge. I re wrapped some of the spots with insulation wrap. I might have to do little by little or wait till November.
I'm also on raised home with old wood flooring. Humidity is not my friend.
I'm also on raised home with old wood flooring. Humidity is not my friend.
This post was edited on 7/28/20 at 8:14 am
Posted on 7/28/20 at 8:16 am to s14suspense
Do you have two units and how big is the house for that price quote?
Posted on 7/28/20 at 11:12 am to glorymanutdtiger
quote:
Do you have two units and how big is the house for that price quote?
Two units, yes but I think that was a quote for just the one bigger unit. ~3K.
Posted on 7/28/20 at 6:26 pm to s14suspense
Ok is it condensing at registers or in attic. If is't register it sucking air from plenum or cooling coil. If it condensing in attic more insulation check for leak also I put radiant barrier on the ceiling help keep attic cooler.
Posted on 7/28/20 at 8:29 pm to DzNtz
What’s air flow like in the attic? A few fans in the attic may help keep the condensation from forming until you can work on it.
Posted on 7/28/20 at 8:41 pm to easy1234
Condensating in attic and dripping on ceiling in two spots. Also on grills but that doesn’t concern me too much. Old insulation is sagging and wet in a lot of areas that have not started dripping yet.
Airflow in attic is minimal. Might try that. Got ac company coming by to give me a price on reinsulating.
Airflow in attic is minimal. Might try that. Got ac company coming by to give me a price on reinsulating.
Posted on 7/29/20 at 5:25 am to DzNtz
quote:
Got ac company coming by to give me a price on reinsulating.
Share the details on that please.
Luckily it’s not been hot enough for it to be a issue recently.
Posted on 7/29/20 at 2:14 pm to DzNtz
Get up there and check first. I found stain one morning on the ceiling and got up in the attic and noticed the glue/adhesive from the duct had partially come undone. $5 trip to Lowe’s and patched up myself, no issues since.
Posted on 7/29/20 at 5:50 pm to DzNtz
Sounds like the ducts are reaching dew point or improperly sealed. Do you have a variable speed unit(s)?
Posted on 7/30/20 at 5:44 am to DzNtz
quote:
DzNtz
Any update on this?
Went and checked mine yesterday evening since it was hot again and the insulation on the worst line was only damp to the touch instead of sopping wet like it had been at its worst.
One thing I noticed was the cold air coming out of the evap? coil box where the insulated copper line goes in and the naked copper line comes out and oddly enough the PVC drain line had cold air blowing out of the top of the pipe you pour bleach in. Should that be capped normally?
Posted on 7/30/20 at 5:55 pm to s14suspense
Still waiting on price. Was supposed to hear back by this evening. Will report back when I hear something
Posted on 8/3/20 at 6:56 pm to DzNtz
Got a quote for $2500 to reinsulate all the ductwork. Never heard back from other company. However this new quote is from a fella that doesn’t speak the best English. Will be sure to inspect his work as he goes.
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