[Strawbale] moisture

[Nikolay Marinov]

Thank you guys,
this is very important issue for me to get deeper in this topic. Precise
detailing from the beginning is really right way for the solution. That's
why I wanted to put this discussion.
Also I would like to make few experimental walls and take samples after some
period, but that is a long process.
Thank you for the replies and recommendations.
Your support is really important for me, thank you deeply.

Niki

On Fri, Apr 8, 2011 at 8:43 PM, Derek Roff <derek at unm...> wrote:

> I agree with Andrew, that the relative permeability of the interior and
> exterior plasters is an important consideration in very damp situations like
> saunas and bathrooms.  I'd like to add that very careful construction
> detailing is probably even more important.  Research by the Canadian
> Mortgage and Housing Corporation (CMHC), an agency of the Canadian
> government, showed that having a continuous air barrier was very necessary
> to avoid moisture problems within the walls, regardless of construction
> method.
>
> Tiny cracks, holes, and seams that allow air movement into the walls will
> transport a lot of moisture with them; that moisture will be concentrated at
> a few spots, and condensation within the wall is very likely.  This can
> easily cause mold and other microbial bale decay.  A small break in the air
> barrier may transport more moisture into the wall than the diffusion through
> several square meters of plaster.
>
> Build carefully, and if possible, check for air gaps and leaks before
> putting the sauna or bathroom into service.
>
> Derelict
>
> Derek Roff
> Language Learning Center
> Ortega Hall 129, MSC03-2100
> University of New Mexico
> Albuquerque, NM 87131-0001
> 505/277-7368, fax 505/277-3885
> Internet: derek at unm...
>
>
>
> --On Friday, April 8, 2011 10:02 AM -0700 Andrew Morrison
> <Andrew at StrawBale...> wrote:
> Hi Niki and Jonas. I would be careful using a material like clay (earthen
> plaster) on an interior surface and lime on the exterior. Keep in mind that
> clay allows for more movement of vapor (is more "breathable") than lime.
> This means that one can transport say 1 measure of vapor into a bale wall
> through the clay plaster while only allowing for .75 measure to move out
> through the lime in the same time period. This means that excess moisture
> can get stuck in the bales.
>
> I have a wet sauna here in the states made of straw bale walls. I used lime
> plaster on both sides of the walls with a lime paint on the interior. After
> a sauna is completed, we open all of the ventilation ports and through an
> extra log or two into the fire. This drives the moisture through the vents
> and walls and dries things out with the dry heat of the fire. It's very
> successful.
>
> Andrew
>
>
> On Wed, Apr 6, 2011 at 8:46 AM, jonas kacerauskas <
> jonaskacerauskas at gmail...> wrote:
>
>
> Hello Nikolay,
> Here in Lithuania 4 years ago we have built straw bale bathhouse (like
> sauna, just with a lot of moisture - we call it russian sauna), where we use
> simple clay plaster about 3 cm. on interior wall and from the incident
> water protect with wooden plankets (there is natural ventilation inside). On
> exterior we did lime plaster - till now everything works fine. tadelact is
> quite expensive way and not needed way to deal with it. As we saw its
> enougth just clay plaster to deal with humidity and ussual you need to
> protect just several places from the direct water and were are a lot of ways
> to do it:)
>
> best regards
>
>
>
> 2011/4/6 Nikolay Marinov <nikvesmar at gmail...>
>
>
> Hi everyone,
> I would like to ask you for advice and share your experience about
> preventing moisture, penetrating into SB walls from bathroom, and other
> spaces with high humidity level.
> What kind of layers and finishes do you prefer to protect your wall if not
> using conventional waterproof materials.
> I know few techniques as: Tadelakt (good water barrier but time consuming);
> Double skin wall with ventilated space between,glass on the wall, but it
> would be nice to share a trusted and working in time method that builders
> and designers like you prefer as solution.
>
> Thank you in advance for you opinion.
>
> Have a nice spring sun.
> Niki
>
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