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OT: Swamp cooler question

Reflective insulation needs an air space to work. 1/2 inch on up. Of course it also cuts down emissivity.

Solid foam board is the only insulation to use with moisture. More people are useing it.

I have been thinking and reading about basement insulation. Many do it differently. The only sure thing is to use solid foam board. Moisture and water leaks, make things difficult. For example, nor practice is to use fiberglass with a moisture backing facing the inside room. Its not a perfect seal by any means. Then you are in Florida, and the hot damp summer weather condenses on the outside of poorly insulated walls causing mold.

I used to walk into my garage and on a sunny day, and the heat was unbearable. Under the roof joists, I stapled reflective foil to the joists with the full space enclosed with the foil. Now, when I walk in the garage, I feel zero heat radiating downward from the roof. Its much cooler. The reflective foil I have, which is also preforated, can also lay on top of fiberglass or paper insulation in an attic, reflecting away the roof radiation.

McDonalds had it right. NEVER wrap food with foil. Well maybe if its preforated, to avoid soggy mess.

greg

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GregS
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[...]

How can it become wet if no rain gets in there and it is vented? Condensation would eventually have to flow towards where gravity tells it to. Since the bottom opening is into the gutters and valley flashings seeping water would create mild stain streaks. But every time I went onto the roof I didn't see any, and it's been up there for many years now.

I am not a great fan of moisture barriers. For example in floors. You have the Visqueen underneath, then tile on top, usually with an impenetrable membrane if done right.

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Regards, Joerg

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Joerg
[...]

My wife does that when I go on biz trips. Makes the sandwiches remain nice and cool for hours, instead of warm or (worse) dried out.

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Joerg

Sounds like a new business mirror plating houses. I think there's money left in the stimulus bill for that. (TFIiC) MikeK

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amdx

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It should also qualify for a AGW subsidy since it will boost the average albedo of the earth's surface.

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Spehro Pefhany

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Jeorg just needs a bigger swamp. ;-)

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Michael A. Terrell

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If I had more deck space at that location, then ...

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Joerg

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Your wife would find a use for it...

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Michael A. Terrell

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Actually she wishes we had less deck. The east side is a party deck, huge, and that also means lots of maintenance. But all windows, can't put a swamp cooler there. Where it's now is just about the only place I could safely go through the wall. If I mount a full-size unit there only the skinniest people would be able to squish by and get to the other part of the deck.

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Joerg

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Build a bridge over it!

Reply to
amdx

Humidity from inside the house condenses in the insulation.

Cheers

Phil Hobbs

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Dr Philip C D Hobbs
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ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
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Reply to
Phil Hobbs

Ok, but it first would have to get through the roofing felt and that's double-felted on our house. Thick tar stuff. In the parts without cathedral ceiling this moisture would need to go through drywall ceilings, then the insulation above that, then avoid hissing out all those roof vents, then go through the double felt.

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Joerg

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Yeah :-)

Problem is, the roof overhangs are very long and low at that point and I'd have to shrink myself to about 2/3rds of my present height so I don't scrape my scalp every time.

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Joerg

Just the drywall--the felt is on the other side, the one that already has the foil, unless I'm completely failing to understand. Most of the air will come through via the chimney effect anyway, especially with a cathedral ceiling--the vents probably make it worse rather than better, because you move more moist air through the cooler insulation.

Moisture barriers belong on the 'warm in winter' side of the wall. It may be dry enough where you are that it doesn't matter, but in Vancouver it makes people's houses rot.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Reply to
Phil Hobbs

Just from memory, I think this is how it looks:

#### Decra roofing shingles, 26ga steel #### 1-2" fiber insulation with foil up top (vented) #### roofing felt, double layered. #### plywood

#### vented attic space

#### 8-10" insulation (some fluffy fiber stuff) #### drywall ceiling

Areas with cathedral ceiling:

#### Decra roofing shingles, 26ga steel #### 1-2" fiber insulation with foil up top (vented) #### roofing felt, double layered. #### 3/4" soundboard #### 2" thick tongue & groove cedar

The shingles are held in place by a batten system.

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Joerg

I see--I missed the two-layer insulation. You basically have two moisture barriers, then.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Reply to
Phil Hobbs

Essentially yes. Maybe even another if they put Visqueen above the ceiling drywall, don't remember.

All homes in the US have that felt except maybe a few really old ones. IIRC it was in Sweden where they went back to this old tar-paper felt because plastic causes mold build-up and is totally airtight. My roofer offered the plastic for a higher price and I declined.

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Regards, Joerg

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Joerg

Joerg schrieb:

Hello,

air is not very good for transporting heat energy, that is why they use water to cool motors and to transport the heat from the boiler to the radiators in the rooms. Every solid material in the rooms and the walls, floors and ceilings store much more heat energy than the air within the room. Just compare the mass of the air in the room with the mass of everything solid within the room.

Bye

Reply to
Uwe Hercksen

Joerg schrieb:

Hello,

the walls and windows of the house might be not air-tight enough for the flow from input to output. They use a blower door test to find and seal all the holes in the walls and windows frames when they build new houses with very good insulation here in germany.

Bye

Reply to
Uwe Hercksen

Joerg schrieb:

Hello,

thru all the holes within the walls, doors and window frames. If you do a blower door test you will be surprised to see where to the smoke goes.

Bye

Reply to
Uwe Hercksen

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