[Greenbuilding] dehumidifying bathrooms - makeup air?

[Lynelle Hamilton]

Stephen, where do you get the clay you're planning to use?  I'm not near 
doing the bathroom yet, but would like to use it.

Thanks,

Lynelle


On 2017-12-19 9:19 AM, Stephen Collette wrote:
> Hello Reuben and all
>
> Yes, Reuben, there are building materials that have been used since 
> time immemorial that can safely manage moisture generated without 
> resulting in damage and ultimately mould growth. Hygroscopicity is the 
> rate at which moisture can be adsorbed by the material. The greater 
> the hygroscopicity, the greater the rate it can take moisture in, and 
> release it. Materials that have high rates of hygroscopicity are 
> unbaked clay, unfinished wood and cork for example. Hygric buffering 
> capacity is the term that looks at how much water the material can 
> safely store/hold/then release before it fails. Again, a higher value 
> means it can hold more. The Lstiburek/Carmody book Moisture Control 
> Handbook made mention (if I remember correctly) of a steel stud with 
> drywall building holding something like 5 gallons of water, while a 
> brick building could hold 500 gallons safely. Brick being fired cannot 
> hold anywhere near as much as unfired clay, which is used in plaster 
> or unfired adobe in your case in your bathroom.
>
> I have some slides, but I can’t upload them to the group so send me a 
> PM and I’ll send them to you.
>
> Cheers
>
> Stephen
>
> Stephen Collette
> BBEC, BBNC, LEED AP, CAHP, BSSO
> Principal
> */Your Healthy House/*
> Indoor Environmental Testing & Building Consulting
> http://www.yourhealthyhouse.ca
> stephen at yourhealthyhouse.ca <mailto:stephen at yourhealthyhouse.ca>
> 705.652.5159
>
>
>
>
>
>> On Dec 18, 2017, at 2:00 PM, 
>> greenbuilding-request at lists.bioenergylists.org 
>> <mailto:greenbuilding-request at lists.bioenergylists.org> wrote:
>>
>> Stephen,
>> that is so fascinating. I deeply appreciate these insights and 
>> reminders of
>> things we (or at least I) had forgotten. One question right off - 
>> materials
>> that store and release moisture - are these categorically different from
>> the materials we regularly see harboring mold? Like caulk, latex paint,
>> drywall? I'd be delighted to pursue these ideas!
>
>
>
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