8" Flexible duct

[Notgrownup]

I installed a dehumidifier under my house and while I was insulating/sealing my foundation vents, I noticed 2 of my bedroom 8" flex duct runs got some water in the outer insulation, Got a quote for $500 to swap them out and I understand, labor, tools, time etc... Tradesmen... They quoted me R8 but if my crawlspace now is warmer than before and dehumidified, can I get away with R6 from Lowes, They have the type that is black poly or plastic outside instead of foil type outside like I have currently.
I can buy 2 25' long pieces, mastic and a Zip tie tool and the zip ties for less than $200.00...
What say you, should I attempt the repair myself? should I not skimp on the $300 and let the pros do it???

 

[brewchief]

Do it yourself, just make sure that you don't have any kinked spots or a bunch of excess wadded up, add support if needed. R-8 would be better but it's more important to not have air leaks, I doubt the old stuff is better then R-6 anyway.

Sent from my SM-G965U using Tapatalk

 

[musgofasta]

Easy project - should be less than $150

Or cut out the wet insulation and re-wrap the flex duct with new insulation for even cheaper - depends on how much is wet/damaged.

 

[Higgins]

Here ya go,

Home Depot

8 in. x 25 ft. Insulated Flexible Duct R6 Silver Jacket


R6 fiberglass insulation for greater insulating power
Used for heating, A/C systems and some venting
Duct can be cut to length as needed

$ 34.21

 

[Slowgsr]

Easy repair yourself. I would just cut open the wet spot and rewrap it.

 

[Notgrownup]

I found what the trade guys use today 8” R8 $1.52 per foot. Just need to buy mastic, big zip ties,tool to tighten all for under $200...I’m doing it...

 

[Notgrownup]

$83 for 2 boxes of 25’ Flex R8 8” duct and 4 big a$$ zip ties.

 

[LS6 Tommy]

DIY. IDK how long each run is, but 25' is a LOOOONG run for flex...

Tommy

 

[Notgrownup]

DIY. IDK how long each run is, but 25' is a LOOOONG run for flex...

Tommy

About 20’ actually and it’s what is there, the main center trunk line is hard big square insulated square

 

[xyster101]

Flex pipe does not have a good flow rate. If there was a way you could do half or more of that in solid pipe you would get more air into those spaces.

If not, pull the flex tight and keep it from being bunched up or having a lot of turns. You will probably do a better job then the pros, but it will take you a lot longer.

 

[Notgrownup]

Flex pipe does not have a good flow rate. If there was a way you could do half or more of that in solid pipe you would get more air into those spaces.

If not, pull the flex tight and keep it from being bunched up or having a lot of turns. You will probably do a better job then the pros, but it will take you a lot longer.

Only 1 turn at the duct...