Hello:

Regarding all the round sheet metal duct work exiting our typical gas fired,
hot air heating
furnace:

What's the best way to seal these duct joints, at least where one can
actually see them ?

Duct tape doesn't really sound like the best way to go.

Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no fireplace in house)
?

Thanks,
Bob

You would be correct to not use duct tape on the joints.

Find metal tape. Here is an example:
http://store.yahoo.com/poseysupply/2x60yarfoilt.html

A good brand name is Nashua.

(top posted for your convenience)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing . . . .
DanG (remove the sevens)




"Robert11" wrote in message
...
Hello:

Regarding all the round sheet metal duct work exiting our
typical gas fired, hot air heating
furnace:

What's the best way to seal these duct joints, at least where
one can actually see them ?

Duct tape doesn't really sound like the best way to go.

Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no
fireplace in house) ?

Thanks,
Bob

Robert11 wrote:
Hello:

Regarding all the round sheet metal duct work exiting our typical gas
fired, hot air heating
furnace:

What's the best way to seal these duct joints, at least where one can
actually see them ?

Duct tape doesn't really sound like the best way to go.

"Duct" tape may work on ducks, but not ducts. You want tape made for
ducts (Duct tape is not, but that is another story).

Look around in the area where ducts are sold. You will find some
slightly more expensive tape made for the job. It will be shinny metal
looking and it will have a liner over the adhesive that you will need to
remove when you use it. Get it straight the first time, it's not coming
off. That liner makes putting it on easier.


Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no fireplace in
house) ?

Thanks,
Bob

--
Joseph Meehan

Dia's Muire duit

If you use tape for sealing ducts, pressure sensitive tape should be
rated UL-181-AP. That is in the new International Residential Building
Code. ShurTape AF-100 is the one I normally use. It has an acrylic
adhesive instead of the rubber based adhesive that regular duct tape
does. It should be rubbed down with a squegee like you use for applying
body putty. It is called a rub down tool. That helps the adhesive to
cure and gives better adhesion. UL-181-AP tapes have the brand name
ant the tape model number written on them. It MUST be at least 2-1/2"
wide It has UL-181-AP rwitten on it in block letters. It also has the
last test date on it as well. It will normall have a white adhesive
protected by a white release paper. If it does not have all of those
features, it is not the correct tape. There are 5 brands with 5
different tape model numbers that are acceptable to code and the UL..
Fasson also makes one as does Ideal. I'm not sure of the other two
brands.

Stretch

I bought a mastic , a thick plastic cement like product you brush on
from my hvac suplier, im sure HD may have a product for it. It is for
supplys and returns not hot chimneys.

On Wed, 20 Apr 2005 18:47:57 -0400, "Robert11"
wrote:

Hello:

Regarding all the round sheet metal duct work exiting our typical gas fired,
hot air heating
furnace:

What's the best way to seal these duct joints, at least where one can
actually see them ?

Duct tape doesn't really sound like the best way to go.

Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no fireplace in house)
?

Thanks,
Bob


Forget duct tape (any brand, any manufacturer) as being
the BEST product to use. you want a brush on duct
sealer/mastic. Not roofing mastic, nor any petroleum based
product. the best duct mastics are water soluble & have
zero or very little flame spread. The better ones have
reinforcing fibers mixed in. These products are not
typically sold at home depots or DIY home centers.

do not apply duct tape or duct sealer to the exhaust
venting. check the building codes for your geographical
area.

try these sources:

http://www.hardcast.com/products/pr_detail.asp?pid=1

http://designpoly.com/sealants.htm

http://www.wardind.com/Products/Sealants.htm#swb-n

http://www.mcgillairseal.com/textDoc...lex_Mastic.htm

We use silicone

--
Bob Pietrangelo


www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist




"Robert11" wrote in message
...
Hello:

Regarding all the round sheet metal duct work exiting our typical gas
fired,
hot air heating
furnace:

What's the best way to seal these duct joints, at least where one can
actually see them ?

Duct tape doesn't really sound like the best way to go.

Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no fireplace in
house)
?

Thanks,
Bob

Regarding all the round sheet metal duct work exiting our typical gas
fired,
hot air heating
furnace:

What's the best way to seal these duct joints, at least where one can
actually see them ?

Duct tape doesn't really sound like the best way to go.

Duct tape is exactly what you want... It's metal and shiny silver and has a
wax paper strip on the sticky side. You do NOT want "DUCK" tape, which is
grey cloth tape and really sticky/gooey.