Insulating ductwork
 

Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

Insulating ductwork
 

On Apr 24, 8:25*am, wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

if its ever moist fiberglass batt will attract moisture and no longer
insulate, moisture ruins it.

spray foam is a better option or glued on foam board

Insulating ductwork
 

On Apr 24, 8:27*am, bob haller wrote:
On Apr 24, 8:25*am, wrote:

Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

if its ever moist fiberglass batt will attract moisture and no longer
insulate, moisture ruins it.

spray foam is a better option or glued on foam board

They have insulation specifically made and sized for
ducts. It has an aluminized looking outer cover. I've
seen it used in basements and attics. Not sure about
crawlspaces, but I would think it would be OK.

Insulating ductwork
 

On Wednesday, April 24, 2013 5:27:44 AM UTC-7, bob haller wrote:
On Apr 24, 8:25*am, wrote:

Can I use fiberglass bat to insulate the main and branch ductwork
in my crawlspace?

if its ever moist fiberglass batt will attract moisture and no longer
insulate, moisture ruins it.

spray foam is a better option or glued on foam board

Highly flammable spray foam or foam board sounds like a good, safe
idea under the house, uncovered.

Foil-backed rigid fiberglass board would be safer.

Insulating ductwork
 

On Wednesday, April 24, 2013 7:25:33 AM UTC-5, wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

By the way, this is round duct.

Insulating ductwork
 

On Wed, 24 Apr 2013 05:25:33 -0700 (PDT), wrote:

Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

How long has the duct been there? Might be a better plan to just
replace it with insulated duct.

I used the flexible round duct. It was dirt cheap- and *way* easier
than cleaning the old ductwork, then figuring out how to wrap it in
insulation.

The down side is that in the 10 yrs since I installed it, I've had one
duct that a mouse decided to chew through and nest in. Now *that*
made a disgusting mess when the heat came on that fall.

Jim

Insulating ductwork
 

On 4/24/2013 6:56 AM, wrote:
On Wednesday, April 24, 2013 7:25:33 AM UTC-5, wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

By the way, this is round duct.

The contractor was gonna put unbacked fiberglass on my heater ducts.
When I added air conditioning, they switched to foil-backed to keep
condensation out.

Insulating ductwork
 

Can I use fiberglass bat to insulate the main and branch ductwork in my
crawlspace?


*I used duct wrap insulation when I did my metal ducts. It was perfect for
the job with an overlapping foil edge. It comes in different thicknesses.
It is fiberglass with a foil back. I sprayed a little aerosol glue on the
duct to hold one end while I wrapped it around. The seams were taped with
foil tape. I also caulked the duct joints to minimize losses. I bought the
duct wrap at a local plumbing supply. Some examples:

http://www.amazon.com/gp/search/ref=... g=mrelect-20

Insulating ductwork
 

On Wednesday, April 24, 2013 3:14:33 PM UTC-5, John G wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my

crawlspace?





*I used duct wrap insulation when I did my metal ducts. It was perfect for

the job with an overlapping foil edge. It comes in different thicknesses.

It is fiberglass with a foil back. I sprayed a little aerosol glue on the

duct to hold one end while I wrapped it around. The seams were taped with

foil tape. I also caulked the duct joints to minimize losses. I bought the

duct wrap at a local plumbing supply. Some examples:



http://www.amazon.com/gp/search/ref=... g=mrelect-20

Is there anything I can put over it to protect it from a cat clawing on it.

Insulating ductwork
 

On Wed, 24 Apr 2013 05:27:44 -0700 (PDT), bob haller
wrote:

On Apr 24, 8:25*am, wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

if its ever moist fiberglass batt will attract moisture and no longer
insulate, moisture ruins it.

spray foam is a better option or glued on foam board
Or glued on duct-board

Insulating ductwork
 

On Wed, 24 Apr 2013 12:36:14 -0400, Jim Elbrecht
wrote:

On Wed, 24 Apr 2013 05:25:33 -0700 (PDT), wrote:

Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

How long has the duct been there? Might be a better plan to just
replace it with insulated duct.

I used the flexible round duct. It was dirt cheap- and *way* easier
than cleaning the old ductwork, then figuring out how to wrap it in
insulation.

The down side is that in the 10 yrs since I installed it, I've had one
duct that a mouse decided to chew through and nest in. Now *that*
made a disgusting mess when the heat came on that fall.

Jim
You won't catch me EVER using flex duct. Anywhere. For ANY reason.

Insulating ductwork
 

Can I use fiberglass bat to insulate the main and branch ductwork in my

crawlspace?





*I used duct wrap insulation when I did my metal ducts. It was perfect
for

the job with an overlapping foil edge. It comes in different
thicknesses.

It is fiberglass with a foil back. I sprayed a little aerosol glue on
the

duct to hold one end while I wrapped it around. The seams were taped
with

foil tape. I also caulked the duct joints to minimize losses. I bought
the

duct wrap at a local plumbing supply. Some examples:



http://www.amazon.com/gp/search/ref=... g=mrelect-20

Is there anything I can put over it to protect it from a cat clawing on
it.


*Off hand nothing that I can think of except more sheet metal. The foil
backing on the duct wrap is a little more durable than that of wall
insulation.

Insulating ductwork
 

On Apr 25, 6:56*am, "John Grabowski" wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my

crawlspace?

*I used duct wrap insulation when I did my metal ducts. *It was perfect
for

the job with an overlapping foil edge. *It comes in different
thicknesses.

It is fiberglass with a foil back. *I sprayed a little aerosol glue on
the

duct to hold one end while I wrapped it around. *The seams were taped
with

foil tape. *I also caulked the duct joints to minimize losses. *I bought
the

duct wrap at a local plumbing supply. *Some examples:

http://www.amazon.com/gp/search/ref=...e=UTF8&camp=17...

Is there anything I can put over it to protect it from a cat clawing on
it.

*Off hand nothing that I can think of except more sheet metal. *The foil
backing on the duct wrap is a little more durable than that of wall
insulation.- Hide quoted text -

- Show quoted text -

I take it the crawl space also serves as a shelter for his cats?
Otherwise, it would seem the best solution would be to make
the crawl space animal proof. I don't think duct insulation would
be particularly attractive to cats to claw on. Especially outside
cats that have plenty of better things.

Insulating ductwork
 

On Wednesday, April 24, 2013 7:25:33 AM UTC-5, wrote:
Can I use fiberglass bat to insulate the main and branch ductwork in my crawlspace?

It is a shelter for the cats. There is actually acess to it in my garage. The cats do claw at it and sometimes rest on top of it.