[Greenbuilding] dehumidifying bathrooms - makeup air?
Lynelle Hamilton
lynelle at lahamilton.com
Tue Dec 19 08:23:47 CST 2017
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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