Community: Webinar Follow-up Q&A

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Presenters Peter Yost and Mike Guertin were inundated with questions during their 12/18/2009 webinar Got Mold? - Energy Efficiency and Moisture Management.

This forum is a space for questions that Peter and Mike were unable to get to during the 60-minute presentation.

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6 Answers

How can we prevent condensation, and eventually ice, to form on the clothes dryer exhaust duct?

I live in a newly renovated and insulated house in Montreal, Quebec, Canada, where the minimum temperature range between - 20 to - 25 F. My clothes dryer exhaust duct is about 1 feet long and connect the clothes dryer directly outside. When not in use, condensation forms on the duct, drips on the hard wood floor, and eventually, ice forms on the duct. All of this is quite logical, but I have never heard of such a problem before. The house temperature is about 70 F. There is not a lot of air circulation between the exterior wall and the dryer so I've installed a small fan in front of it.

Asked By Marie-Helene Burman | Dec 21 09
6 Answers

What are the best sealers for concrete block walls and concrete slab floors, when applied from the inside.

As noted in the webinar, stopping moisture at the outside face of an assembly is always best, but for older (1950's & 60's era) concrete block walls and concrete slab floors below grade, what type of sealer products or other techniques work best to try to prevent moisture penetration, and subsequent musty smells? Thank you.

Asked By Rick Neumann | Dec 21 09
1 Answer

Photo of moisture on concrete floor in slide show

what’s the origin of the moisture in the concrete floor and mold behind the trim photo? Was it when the floor was cleaned? Or a plumbing break? Or when the concrete was drying during install?

Asked By Anonymous | Dec 21 09
1 Answer

Once mold moisture is gone and growth is stopped, must the stain be removed?

When remodeling a story and half, mold was found in a section that was unheated but will now be in the heating envelope. Will this staining need to be bleached or just left as is?

Thank You,

Asked By Dan | Dec 21 09
3 Answers

Designing to dry

In middle Tennessee, I always see deck bands bolted over cladding directly to the house band. There is never any flashing and this crushes the drainage plane behind the cladding. The result is both deck and band joist rotting. I'm amazed at the lack of designing to dry.

Asked By Anonymous | Dec 21 09
3 Answers

Capillary action slide

What climate zone was that capillary action example in?

Asked By Brian Becker | Dec 21 09
2 Answers

Building code

Does building code require that we put a sill sealer or capilary break when framing walls on concrete (in a basement for example)?

Asked By Anonymous | Dec 21 09
3 Answers

Climate zone differences

What are we to understand about differences in the united states. I build in Pennsylvania (outside of Philadelphia). We are on the border of climate zones and it makes it difficult to know where to properly place vapor barriers in different conditions and some guidance would be appreciated.

Asked By Anonymous | Dec 21 09
2 Answers

Filling the gap

I have a warehouse with brick walls. There is a raised foundation and douglas fir wood floors in part of the building. There is a gap of about one inch between the edge of the wood floors and the brick. What should I fill that gap with to minimize moisture transfer?

Asked By Anonymous | Dec 21 09
1 Answer

Linseed oil

Can linseed oil permanently seal against the water movement?

Asked By Anonymous | Dec 21 09
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