Photo reportage: steps of outdoor insulation of a house

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
the middle
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by the middle » 19/12/11, 14:53

This is exactly what I had in my attic.
It's gone with the blow of cuter, but it is not recommended, it is necessary to make a clean hole which allows the humid air to escape.
What you have is like a lid over a hot pan, it condenses.
You have to put one or two ventilation tiles, and make a hole for the air from the attic to escape through this tile
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owen
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by owen » 19/12/11, 23:31

I'm waiting for the roofer to be able to install a cat flap
either make a hole.

For my part, I will temporarily place a fan and humidity absorber trays.

I hope it won't be long. By any chance, do you know where to get cheap moisture absorbing refills?
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dedeleco
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by dedeleco » 20/12/11, 00:29

It is hygroscopic powdered calcium chloride, put in a net.

By heating to 60 ° C to over 100 ° C the water condensed on this calcium chloride can be dried by evaporation in a resistant saucepan and recover the dry calcium chloride, in pieces, which then suffices to grind with a pestle to recycle completely.

I once did this by cycling repeatedly to dry out a rotting wooden trailer.

You can buy this calcium chloride from a chemical or road salt supplier.
http://fr.wikipedia.org/wiki/Chlorure_de_calcium
http://fr.wikipedia.org/wiki/Fondant_routier

cheap supplier:
http://www.multiroutes.com/?5D3A58AC-7D ... F956A316E8
http://www.landor.ch/fra/Calciumchlorid ... _4149.aspx
http://scienceamusante.net/wiki/index.p ... de_calcium
http://www.ac-nancy-metz.fr/enseign/phy ... alcium.htm


You can use sea salt (free dried sea water 30g / liter of water) with also calcium chloride and sodium chloride, less hygroscopic but which works.

There are many other drying salts, such as lithium chloride, much more drying (too much).

Be careful, do not put so little on a surface such as parquet, furniture, absorbent carpet because the powder absorbs water and it becomes almost impossible to dry and therefore we keep a beautiful irremovable wet spot, a real cowardice.
It is corrosive to the skin, so wash thoroughly with plenty of water.
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elephant
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by elephant » 20/12/11, 16:34

(free dried sea water 30g / liter of water)


Powdered water for hikers: super practical, no unnecessary weight: just add water and it's ready! Image
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owen
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by owen » 20/12/11, 17:40

Powdered water for hikers, I did not know.
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AXEAU
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by AXEAU » 20/12/11, 18:44

Yeah, Owen we put it all over the fries.
The worst thing for hikers in the desert is when they start to urinate powder, there they really have to find a water point.
I'm going out too!jlg
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dedeleco
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by dedeleco » 20/12/11, 20:56

Always to jump on the funny detail !!!!
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owen
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by owen » 20/12/11, 21:17

well, I'm going to get myself a bunch of fries.
well salted.
samurai sauce.

Who wants what? :P


Otherwise still no answers from the roofer.

Another idea, which seems to me accessible as a handyman, is to drill through the walls and thus obtain a fence.

As a result, I do not wait for the roofer and the attic can start to ventilate. I do not know the number of holes and the places to make them.

What do you think ?
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by dedeleco » 20/12/11, 22:05

Before drilling, damaging the facade, doing anything without knowing the real cause, you must determine the precise cause, scientifically testing for possible errors.
I gave a nice list lived of possible causes, veritable almost invisible possible crap, incomplete list of traps, which cannot be resolved by better ventilation, but by removing the real cause.

I even explained that a better ventilation, if bad luck, can have the opposite effect, to wet everything much faster, by the arrival of very humid air on a colder surface where this air deposits all its moisture !!!

So take a good look, measure, note the weather conditions and beware of hasty judgments and too quick actions that can be unnecessary, or even make the situation worse.

For the moment nothing is clear !! where is this water ??? everywhere or in specific places, on what ?? , etc ...

It could be a stealthy leak in the roof, a pipe, or a condensation of the hot, very humid outside air during the day on a cold surface that keeps the cold at night (so ventilating will be much worse in making water). ) !!!

Beware of quick certainties, not cross-checked !!
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by aerialcastor » 20/12/11, 22:55

owen wrote:question:

I would like to make sure of a point.
Friends roofer, black fabric with small dots,
is it a roofing or vapor barrier?
Personally, I think it's a vapor barrier but I'm not sure.


You can't see the difference in a photo. Isn't there a brand or reference written on it?

In any case if it is a vaporiser the cause of the condensation is all found.

There was a time now gone when we put umbrellas (also called under roof screen) which was not permeable to water vapor so it necessarily condenses.

DOn 2 things to check: if it is a rain cover and if it is HPV (highly permeable to water vapor).
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