In my quest for hands on experience, this past weekend,I worked with the duct designer building trunk
line and distribution boxes out of ductboard for a
We used Certainteed R-4 ductboard.Heating system and
all ducts in attic, flex duct is R-6. All seams were
stapled, taped with foil tape. Connections to units
were with Hardcast mastic tape.
My job was pretty much laborer aka stepnfetchit.
I was wondering about IAQ and ductboard for people
with breathing problems and related issues.
So I have some questions.
By cutting in to fiberglass to make boxes, will
that free enough particles to be an issue for the
Is there a sealant that should be applied over these
cuts? If so, when collars are installed into trunk
line would those areas also be sealed and how?
Is this overkill?
Does ductboard come in higher R-values?
Would this be a cost effective upgrade?
Is ductboard used primarily for ease (ha) of install?
I do not see a lot of ductboard on my inspections
and wonder why.
Any comments and suggestions are welcomed.
This is not my regular job, just have that inquiring mind
thing going on.
Also I saw that in installing the flex duct that
it took 2 people to streach the ducts. I was told that
you have to hold the inner lining and pull the lenghth
of the duct to unkink before installing.
I wondered about this because on my inspections I often'
see one guy installing flex. What do you think??
Any suggestions for improvement would be appreciated.
Goal is 5% duct loss.Will test once home is completed.