Ventilated crawl space: water repellent treatment of walls?

[Christophe]

Is it possible to waterproof the crawlspace walls? In other words: is it conceivable, advisable or strongly advised against applying water-repellent treatment on the interior walls of a crawl space?

If yes pkoi? If not pkoi?

The walls of our crawlspace are often wet to wet the ground for several meters in case of rain. All this humidity is lost calories ...

So I was considering applying a "light" anti-humidity treatment such as a special water-repellent cave paint (sold in kg in the form of wet powder). Problem: rising humidity risks damaging the walls above the void ...

FYI, I had already applied this product on the wall of our technical room adjacent to the thermal pad and I had gained 5 ° C (from 19 to 24 ° C)! I found it HUGE! After I put 3 cm styrodur plates and I won nothing more! In other words: an anti-humidity treatment has had much more effect than the insulation itself! Crazy huh?

Come to think of it, I did not notice any problem of rising humidity in the room at the top of this wall (it is however fully buried) ...

Your opinions?

ps: here is the product in question!

White cement mortar for waterproofing all concrete or masonry wall problems. Process for the waterproofing of interior or exterior walls partly or totally underground: cellars, ponds, wells for convectors, foundations, ... Treatment for waterproofing the floor and walls in bathrooms, showers, sanitary facilities, before moving on to completion and decoration by laying slabs or tiling.

WATER VAPOR PERMEABLE

datasheet: https://www.econologie.info/share/partag ... Z5aXZS.pdf

[Christophe]

Uh can kk1 explain to me this indicated in the aquaplan datasheet: https://www.econologie.info/share/partag ... Z5aXZS.pdf

Despite his absolute tightness, its characteristics of micro-porosity allows the support to "breathe" (permeability to water vapor). This prevents any vapor pressure behind the plaster.

Does that mean that it lets gases through and not liquids?

[hic]

Is it possible to waterproof the crawlspace walls? In other words: is it conceivable, advisable or strongly advised against applying water-repellent treatment on the walls of a crawl space?

The walls of our crawlspace are often wet to wet the ground for several meters in case of rain. All this humidity is lost calories !!!!

Your opinions?

hi Christophe
But. . . if it's rain,
infiltration must be done from the outside
the problem is outside not inside,

So your interior treated wall stays wet

Wouldn't he?
useful to deal with the problem at its source


a little 'theory'
Air is the cheapest insulation! better if it is dry

1Kg of water "absorbs" 4 times more energy than 1Kg of air
(1 cubic meter)
and is very conductive.

A body immersed in water has a multiplied heat loss
by 20 compared to air.

Water in a wall is a thermal bridge


AuR'voiR

[Christophe]

Well from what I saw on the plan we have geotextiles but they are more than 20 years old ...

And some wall underground 3m deep !!

In short: I can't imagine the earthmoving job, moreover you would have to tear off tarmac and a terrace to treat!

In addition, it will not prevent infiltration by rainwater (pouring) that runs off ...

Water "absorbs" 4 times more energy than air
and is more conductive.

Exact, for air 1 kJ / kg. ° C and 4.2 kJ / kg. ° C for water are required.

But watch out for comparison units! By comparing a gas and a liquid, I think that it is necessary in this case to speak in Voluminal Calorific Power and not mass otherwise it is not possible to represent the thing well.

4 times more energy is for the same mass or the density of air is 1000 / 1.3 = 770 times less than water.

So I would say that the same volume of water absorbs 770 * 4.2 = 3234 times more energy than air!

A puddle of cold water, say, 3L in your cellar will absorb as much energy to heat up as 10 m3 of air!

ps: all this is interesting but does not answer my question

[delnoram]

Does that mean that it lets gases through and not liquids?

Yes like lime

(Moderation makes it a duty to replace members on compulsory holidays)

[Christophe]

Forced vacation you mean!
Who would complain about having a forced vacation? There is only him!

[hic]

Well from what I saw on the plan we have geotextiles but they are more than 20 years old ...

And some wall underground 3m deep !!

In short: I can't imagine the earthmoving job, moreover you would have to tear off tarmac and a terrace to treat!

In addition, it will not prevent infiltration by rainwater (pouring) that runs off ...

ps: all this is interesting but does not answer my question

re-hi Christophe
My practical idea is to solve the problem at the source
(because more effective overall)

and now in 3 lines,
you give me the source, there is no photo

Reread you have the source !!!

AuR'voiR

[Christophe]

So your solution would be to put a big umbrella on the house to prevent it from raining on it?

[hic]

So your solution would be to put a big umbrella on the house to prevent it from raining on it?

re-hi Christophe

going back to the source
find the designer of the environment of your house and have him chased
(simple suspicion for now)

AuR'voiR

[Christophe]

Do you want me to contact God?

ps: for quotes https://www.econologie.com/forums/quotes-et- ... t6185.html