Attic temps???
Tommy
accepted summer daytime attic temps aposed to outside temps with about
40% tree shading?
I went with a alum metal silver roof.
TIA, Tommy.
David Williams
-> TIA, Tommy.
A word of advice... Metal roofs are great from many points of view, but
they have one major disadvantage. In wintertime, snow tends to slip
off them as avalanches. Without warning, anyone or anything that is
underneath the eaves can get buried in an instant.
I have a metal roof. I know.
dow
News
"David Williams" <david.w...@bayman.org> wrote in message
news:1214864005.9...@bayman.org...
IN the Alps they fix small metal Tee pieces on the roof to hold the snow.
Ed
Hmmm....Never had that problem
Ed from S Florida... :-)
Tommy
Anybody have any imput on what attic temps should run say in 95 degree
sunny summer days vs. outside ambient temps?
Could there be another forum that would be helpful?
daestrom
I don't think there's any 'magic' number. Obviously during A/C season it
would be best to run 'as low as reasonably achievable'.
Since you already mentioned a silver roof, I won't bother talking about
using lighter colors.
But you might look into some ventilation. In the great-white north we like
to have well ventilated attics to avoid ice-dams and related damage.
Soffitt (sp) vents under the eaves and ridge vents along with vents at the
peaks of gables will allow natural circulation of air to help keep
temperatures down.
I'm in NY and I often see 110F in the attic this time of year.
daestrom
ABLE_1
For all practical purposes each attic temp is going to be different for a
number of reasons. Roof pitch - East West orientation - Ventilation - Etc.
Having had to work in attics during the summer in the northeast I would
venture to say that on a scale of 1 to 10 most attics are in the 13 + +
range. :~)
If you need a closer approximate than that, then stick a thermometer up
there near the hatch and check it at 7am - Noon - 5pm Add them together and
divide by 3. Then subtract the daily average temps from that and you should
get a good Delta-T.
Please publish the results here.
BTW anything above 84F makes me
sweat.......................................... a lot!!!!!!
Les
tommy....@omnicare.com
Thanks Les I'll get that average today. I installed a max-min dig
therm. a couple of days ago in the attic. 7-2-08 max attic reading was
92 degrees, with the outside temp at my weather station max high was
86 degrees.
Tommy
was 78 degrees and the outside average was 77 at the averaged times of
7:00am 12:00pm, and 5:00pm. Looks lke the forcast showing chances of
rain the next few days. I'll wait for a good week of hot summer days
were the house is soaking in the sun.
RicodJour
Your attic temperatures are lower than I would have expected, so
something is working. Other than the metal roof, what's the rest of
the construction/insulation like?
R
Tommy
small 275 cfm thermally protected industrial electrical fans to 1 of 5
gables vents. It has a totally sealed shroud, so what goes through the
fan does back wash around it. I have another 675 cfm gable fan with
sealed fan shroud. The other 3 gables are just vented. Fans are awaiting
me to add temp switches in a few days to save electric when the temps
are low. May add a humistat later.
The house is a late 40's 1675 square foot ranch style with a walkable
roof pitch. It has a Gavalum silver alum roof over a single layer of
dark asphalt shingles. There is a 3/4" gap between shingles, and metal
roof. Sheathing below the shingles is 3/4" tongue and groove. The only
insulation is in between the ceiling joist(R26) ,and awaiting some blown
in 12" of pink insulation.
The house is now getting a remodel. My front porch ceiling has about 45
square foot opening which is open to the attic right now which probably
is a very good draft vent. So I need to heavily vent my 35'x8' porch
which pulls cooler air from shaded tree area joining it.
Everything is being done to reduce energy cost, and increase comfort. I
do everything I can myself. Including next a 40 gal solar batch water
heater project .
Any imput is welcome.
Jeff
> I've been really happy past few days with attic temps. I just added 2
> small 275 cfm thermally protected industrial electrical fans to 1 of 5
> gables vents. It has a totally sealed shroud, so what goes through the
> fan does back wash around it. I have another 675 cfm gable fan with
> sealed fan shroud. The other 3 gables are just vented. Fans are awaiting
> me to add temp switches in a few days to save electric when the temps
> are low.
So, the fans are running continuously?
I've got mine on a straight temp limit switch. A better question
solution would be some kind of differential controller that kicks in
over a certain temperature. Seems like that should be commercially
available, if not it's worth making.
I don't think you'll be able to do any better with your attic temps.
Unless you add an AC up there!
Jeff
tommy....@omnicare.com
>
> - Show quoted text -
Just updating that theres been no updating. I have not had more than 1
day straight of good thermal soaking of the roof. Maybe here in a few
days,
Tommy
shown good results. We have had an unusually cool July so far here South
Central Ky, so keep in mind the outside temps are around 8 to 10
degrees cooler this year..
The temp average was done using a suggestion of taking temps at 7:00
am 12:00pm, and 5:00am from an earlier post.
Outside ambient temp average is "78 degrees", and attics temp is "84
degree" average. Monitoring remote thermometers often, I have only seen
the attic temp about 10 degrees higher than out door temp a few days
ago. Appears to keep around a 6 to 7 degree difference in the day time
hours.
Night attic temps are slow to cool though. There is almost always a
hotter +10 degree difference through a good period of the over night.
I have attic thermostats ready to install to kick on the gable fans on
when needed. Fans have been running continuously. Would 75 Degree
setpoint be a good starting point?