Type: Posts; User: energy_rater_La
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I've yet to do a house with a foam sealed attic where we added
a duct to the attic, or a return from living space into foam sealed attic.
well there was one house, but after a few months
water (condensation) will exit at lowest point.
without opening it up...its just a wag.
has any work been done around this area & above it?
in other words...has anything changed recently...
and any return that runs from attic to crawlspace is going to be leaky
if the building cavities are used for return & not air sealed.
not sure if high relative humidity is an issue for you, but...
If you invested in testing, the house (with a blower door test)
and duct test (duct blaster test) you would know how much
house infiltration & duct loss you have.
the pdf link deals with whole...
I find mold on supply registers, inside of supply box
and into the duct often.
usually the issue when mold grows in this area
is from an oversized cut in the ceiling for the supply
box. the hot...
you would have to open it up to find out.
assuming an air change rate can get you in trouble.
a blower door test will provide ach, then
you add fresh air determined necessary.
aren't hrvs for cold climates?
(heat recovery ventilator)...
what is in that fur down? duct?
what is outside in this area on wall?
hard to tell from here, but you definitely
have a moisture issue.
best of luck.
if the upstairs is smaller than the first floor,
then there are walls of the upstairs rooms
that have attic on the other side.
these walls shared with attic space are
hot walls (cold in...
by humidity control, do you mean to add to Relative Humidity
or lower RH?
3000 sq ft...double, or triple wide?
the problem with trailers is that the ductwork/supplies/returns
are all buried...
just in time for the fall shoulder season!
the foil bubble foil "insulation" does little to nothing.
run times: time the length of time the unit runs
then time the lengths of time between unit running.
the a/c needs to run 15 minutes to even begin dehumidification.
when the system is oversized...
from your first post:
Air Infiltration test: 3.37 ACH50
when I was doing new construction housing
our goal was .35 ach.
your high RH may have a outside source.
y'all must be right on the border where it changes from
allowing 80% furnaces to mandating 90+% furnaces.
I have to agree that changing the furnace (s) makes the
most sense since this is new...
energy star as I understand it has the goal of zero energy.
so the best scores are the lower numbers.
ditto questions in post above.
best of luck
the heat producing portion of dehumidifier goes outside,
so you wouldn't have to worry about it heating up the...
are returns sealed air tight? sounds like a lot going on in the return
from your description. can you post some pics of the outside of the
return(s) and inside the return(s).
where are ducts...
too bad the installer didn't explain the benefits of dehumidification.
lowering indoor relative humidity not tstat setting.
cold can be 75 degrees & 50% RH as opposed to sticky 70 degrees & 65% RH....
and thanks to you for coming back to tell us!
it is nice to have the thread contain all info
& the solution/source.
I wouldn't want to rehab that...
sitting in dusty cellulose all morning.
and I'm usually all for sealing & insulating ducts,
but I really hate working in cellulose.
the first thing is to...
this filter was made to fit into a 1" slot on a return air filter grill.
see the one inch lip? fits into existing r/a filter grill.
it is a retro fit media filter that retro fits into
I'll have to ask my supply house if they can get it.
hopefully they have forgotten the fiasco when I tried
to get R-10 duct from some info someone here sent me.
(I think it blew their minds!! LOL!)
this is the type filter you can use.
media filter with 1" lip so that it retrofits
into existing return air filter grill.
IMO one of the best affordable filters around.
I have to say...I've never noticed the difference in flex brands.
maybe I've never seen the Royal as it doesn't seem to be
available, or not stocked, by supply houses in my area.
I use the wider...
ask for a load calc, and an evaluation of the ductwork.
also, ask for good (minimum SEER), better (mid range SEER) and
best (high SEER) bid.
the more info you have the better.
best of luck.
to be frank with you OP, not many will opt to work on
ductwork in a trailer.
the 'belly' is filled with blown insulation.
the actual 'belly' material varies, but you have
to cut into the belly &...
I think it has been mentioned in that thread.
they can 'see' it in the winter when the snow on his
roof doesn't melt off to show rafter location on the roof.
and bragging rights to the lowest utility bill in the hood.
so you have yellow batt insulation in the attic?
you could have insulation entering the house via
oversized cuts in ceiling hidden by supply grills.
you could have lose insulation that was in...
installing manual dampers at each duct would help to
reduce air from some areas & increase air to others.
ducts would have to be taken off at the supply plenum.
new start collar with damper...
that is what I was thinking. WOW.
" insulation that have an exterior vapor barrier and sealing the edges to stop damp air from infiltrating the insulation."
sealing the edges is always missed.
it can be as simple as painting...
tri boxes or mixing boxes.
can work if done correctly.
reusing flex isn't a huge savings.
the material is cheap, it is the labor you are paying
if it is R-6, you should replace with R-8...
the worst case of ducts buried in insulation
I ever saw ...only once, but
you could track 70% of the runs of flex due
to the water stains on the ceilings.
very extreme case.
I see it to...
use hvac products on hvac ducts.
duct wrap or insulated flex, are the things
reflective bubble wrap, ceramic coatings are
not approved materials. there are reasons for that.
where is the house?
in some climates it is ok to bury the ducts.
in my hot humid climate, we strap ducts off
this is something that changes climate to climate.
I agree. thinking about the people with oversized systems
in existing homes.
like the dentist who keeps his master suite at 68 in the summer.
and a 3 ton system on that 900 sq ft area.
Would fixing the air leaks likely fix the smell?
To fix the air leaks, would one seal the cavities or convert the system to a metal duct system?
ductwork can be mastic sealed if there is...
I have to say, this is one product that I've never seen
in residential. but to me....it seems like it would work.
maybe one day, with the right...
put it in another window?
if they set up data loggers they will gather info for
set time period. this will allow them to see what is
happening at night.
best of luck.
you could always remove what you can inside the
coil & insulate it externally.
it is true.
media filters (4" filter) & bag filters are less
restrictive than the 1" pleated filters.
the best filter does nothing for a leaky return
& leaky ducts.
only after mastic seal of...
Alison Bales is a knowledgeable man.
I've followed his blog for several years now.
will you be talking to the hvac company this week?
is BRLA Baton Rouge La.?
" I've been in MY attic to get the Christmas decorations down in December and it is still very hot up there even in cold temperatures."
if your attic is hot in December...