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Home > Archive > Building and Construction > February 2006 > Raining inside the house
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Raining inside the house
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| Foam Insulation Technology MV 2006-02-08, 9:21 am |
| Built a new 20x20 exposed ceiling joist cathedrial ceiling 2 story
sunroom off the kitchen facing south w/ 24 windows, a jotul gas stove
with a dozen large potted plants spread about. When the temperature
goes below freezing for more than a day water can be found dripping
down two doubled celing joists- closest to the ceiling, one on each
side, that pools water on the floor under an eloow of the joists on the
floor. The water drips are dark and you can see them begin to form on
the joists and get more pronounced as the water streams down to
virtually amber where they drip off. The roof has R30 of 2lb form board
above he exposed tung and groove pine ceiling and exposed joists.
Bitchethain (sp) used at the hip joining the kitchen. It does NOT do
this when it's raining, just when it gets cold.
Any thoughts gang?
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| Switch 2006-02-08, 9:21 am |
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Foam Insulation Technology MV wrote:
> Built a new 20x20 exposed ceiling joist cathedrial ceiling 2 story
cold.
>
> Any thoughts gang?
probably just water in the lumber
it should dry out after a while
the cold just puts the squeeze on the lumber
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| bitternut 2006-02-08, 10:21 am |
| Condensation is my guess. What is the relative humidity of that room and
does that heater have a vent to the outside or does it vent directly into
the room?
"Switch" <bigbadbarry@adelphia.net> wrote in message
news:1139404234.029249.104080@g14g2000cwa.googlegroups.com...
>
> Foam Insulation Technology MV wrote:
> cold.
>
> probably just water in the lumber
>
> it should dry out after a while
>
> the cold just puts the squeeze on the lumber
>
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| tbasc@bellsouth.net 2006-02-08, 12:21 pm |
| Have you checked relative humidity at high point in space?
There are a lot of humidity producing items in there.
TB
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| tbasc@bellsouth.net 2006-02-08, 12:21 pm |
| Good point.
TB
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| You need to get some insulation into the roof - problem is condensation
(perhaps also Interstitial Condensation in the fabric)
You may also need a vapour barrier
HTH
Jim
"Foam Insulation Technology MV" <vze3mt26@verizon.net> wrote in message
news:1139404038.272151.213920@g47g2000cwa.googlegroups.com...
> Built a new 20x20 exposed ceiling joist cathedrial ceiling 2 story
> sunroom off the kitchen facing south w/ 24 windows, a jotul gas stove
> with a dozen large potted plants spread about. When the temperature
> goes below freezing for more than a day water can be found dripping
> down two doubled celing joists- closest to the ceiling, one on each
> side, that pools water on the floor under an eloow of the joists on the
> floor. The water drips are dark and you can see them begin to form on
> the joists and get more pronounced as the water streams down to
> virtually amber where they drip off. The roof has R30 of 2lb form board
> above he exposed tung and groove pine ceiling and exposed joists.
> Bitchethain (sp) used at the hip joining the kitchen. It does NOT do
> this when it's raining, just when it gets cold.
>
> Any thoughts gang?
>
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| Moisés Nacio 2006-02-08, 4:21 pm |
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"Foam Insulation Technology MV" wrote in message
> Built a new 20x20 exposed ceiling joist cathedrial ceiling 2 story
> sunroom off the kitchen facing south w/ 24 windows, a jotul gas stove
> with a dozen large potted plants spread about. When the temperature
> goes below freezing for more than a day water can be found dripping
> down two doubled celing joists- closest to the ceiling, one on each
> side, that pools water on the floor under an eloow of the joists on the
> floor. The water drips are dark and you can see them begin to form on
> the joists and get more pronounced as the water streams down to
> virtually amber where they drip off. The roof has R30 of 2lb form board
> above he exposed tung and groove pine ceiling and exposed joists.
> Bitchethain (sp) used at the hip joining the kitchen. It does NOT do
> this when it's raining, just when it gets cold.
>
> Any thoughts gang?
It may be possible your roof doesn't have adequate ventilation above the
insulation. What type of configuration for ventilation do you have?
Or, is this one of those rooms, which the roof is made from aluminum panels
with the form board up against the roof?
More information of the construction would be useful.
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| Foam Insulation Technology MV wrote:
> Built a new 20x20 exposed ceiling joist cathedrial ceiling 2 story
> sunroom off the kitchen facing south w/ 24 windows, a jotul gas stove
> with a dozen large potted plants spread about. When the temperature
> goes below freezing for more than a day water can be found dripping
> down two doubled celing joists- closest to the ceiling, one on each
> side, that pools water on the floor under an eloow of the joists on the
> floor. The water drips are dark and you can see them begin to form on
> the joists and get more pronounced as the water streams down to
> virtually amber where they drip off. The roof has R30 of 2lb form board
> above he exposed tung and groove pine ceiling and exposed joists.
> Bitchethain (sp) used at the hip joining the kitchen. It does NOT do
> this when it's raining, just when it gets cold.
>
> Any thoughts gang?
>
You clearly have an interior moisture problem. You have a ton of
moisture inside, coming from somewhere, with no way for it to get out.
It is condensing on the coldest surfaces in the room (ceiling).
Determining where this excessive moisture is coming from would be a good
start. How new is the addition? Is it framed from green, air dried, or
kiln dried, lumber? The potted plants are a major concern.
If the gas stove is unvented than IT and the plants (mostly the stove)
is likley your problem. If the stove is unvented you are dumping massive
amounts of moisture into the room (in the gas) to heat it. This moisture
has to go somewhere and in a tight structure (R30 roof insulation coming
from 2 layers of 2" ISO @ R16 each I assume) it will condense on the
coldest surface, which in your case is the ceiling.
You have to either take the moistre our through
ventilation/dehumidification or stop bringing it into the room.
Mark
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| Foam Insulation Technology MV 2006-02-10, 12:21 am |
| Thanks folks. The stove is vented, but the number of plants undoubtedly
supply the volume of moisture. But... it's winter and that's a "good"
thing, except that it rains in one part of the room. No HVAC in the
house, we add window air conditioners for August.
The contractor (started a year ago June.. he worked straight through a
hard winter and did the job on time and on budget....get my drift?)
I've sice become an Icynene dealer, and "if I had to do it all again" I
know what I would have done. BUT he put R30 of 2lb sheets up with a
plastic barrier. So, what's the options? Tear off the roof? Any
"internal" options? I thought of applying a textured paint to the
"drip" surfaces to absorb the moisture, but it's brown and would stain.
Thanks agin y'all for the input.
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| Erik Dillenkofer 2006-02-10, 7:21 pm |
| Dehumidifier?
"Foam Insulation Technology MV" <vze3mt26@verizon.net> wrote in message
news:1139542910.323913.303980@g44g2000cwa.googlegroups.com...
> Thanks folks. The stove is vented, but the number of plants undoubtedly
> supply the volume of moisture. But... it's winter and that's a "good"
> thing, except that it rains in one part of the room. No HVAC in the
> house, we add window air conditioners for August.
>
> The contractor (started a year ago June.. he worked straight through a
> hard winter and did the job on time and on budget....get my drift?)
> I've sice become an Icynene dealer, and "if I had to do it all again" I
> know what I would have done. BUT he put R30 of 2lb sheets up with a
> plastic barrier. So, what's the options? Tear off the roof? Any
> "internal" options? I thought of applying a textured paint to the
> "drip" surfaces to absorb the moisture, but it's brown and would stain.
>
>
> Thanks agin y'all for the input.
>
| |
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| Foam Insulation Technology MV wrote:
> Thanks folks. The stove is vented, but the number of plants undoubtedly
> supply the volume of moisture. But... it's winter and that's a "good"
> thing, except that it rains in one part of the room. No HVAC in the
> house, we add window air conditioners for August.
>
> The contractor (started a year ago June.. he worked straight through a
> hard winter and did the job on time and on budget....get my drift?)
> I've sice become an Icynene dealer, and "if I had to do it all again" I
> know what I would have done. BUT he put R30 of 2lb sheets up with a
> plastic barrier. So, what's the options? Tear off the roof? Any
> "internal" options? I thought of applying a textured paint to the
> "drip" surfaces to absorb the moisture, but it's brown and would stain.
>
>
> Thanks agin y'all for the input.
>
The other reply of a dehumidifier is one option. Another you could that
may not be so hard on your electirc bill is to vent a small amount of
air from the peak to the exterior and see if moving the air around helps
a bit. Another option, though a bit more costly, would be to install an
air to air heat exchanger. This would dump moist inside air to the
outside while recovering about 80% of the heat, transfering it to
incoming fresh air. I would think at best, if you did it yourself, you
could plan on the heat exchanger option costing you about a grand but it
would more than likley be the best.
It this situation there isnt really much you could do even if you had it
to do over again. In a tight space with a cold ceiling (icyene, tight
foam/fiberglass/poly vapor, lots of glazing), with a lot of moisture,
there will be condensation. You just have to have a plan to get it out
of the space before it gets a chance to turn into a drip. Greenhouses in
winter are very wet spaces.
Mark
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