Pete’s Puzzle: Mold on Painted Clapboards is Food for Thought

Subtitle: 
There is mold on the factory-primed, latex top-coated wood clapboards on the south but not the north side of our house

Images: 

Whenever my wife starts a conversation with, “OK, Mr. Building Scientist,” I know I am in some kind of trouble. That proved to be the case one day when we were out hanging laundry on the south side of our house.

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Pete’s Puzzle: Mold on Painted Clapboards is Food for Thought

Subtitle: 
There is mold on the factory-primed, latex top-coated wood clapboards on the south but not the north side of our house

Images: 

Whenever my wife starts a conversation with, “OK, Mr. Building Scientist,” I know I am in some kind of trouble. That proved to be the case one day when we were out hanging laundry on the south side of our house.

read more

Pete’s Puzzle: Fanciful Fuel

Subtitle: 
Where did the water and blue-green staining on this fireplace support column come from?

Images: 

A new client called me, saying that his insulation contractor urged him to contact me about some moisture problems in the home before they actually embarked on a major energy upgrade. (That was gratifying.) The home was actually moved many years ago off of a failing rubble foundation to a new concrete masonry unit (CMUConcrete masonry unit. Precast concrete block used to build walls. CMUs have hollow cores that can be filled with concrete onsite for additional reinforcement. The use of stronger, more lightweight types of concrete such as autoclaved aerated concrete (AAC) is becoming increasingly popular in CMU manufacture.

) foundation on a different site.

Image #2 (bottom of page) shows the home from the front. Image #3 shows the bare CMU on the above-grade portion of CMU foundation.

But it is Image #1 (right) that is the real puzzle. Here are the puzzle pieces:

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Pete’s Puzzle: Fanciful Fuel

Subtitle: 
Where did the water and blue-green staining on this fireplace support column come from?

Images: 

A new client called me, saying that his insulation contractor urged him to contact me about some moisture problems in the home before they actually embarked on a major energy upgrade. (That was gratifying.) The home was actually moved many years ago off of a failing rubble foundation to a new concrete masonry unit (CMUConcrete masonry unit. Precast concrete block used to build walls. CMUs have hollow cores that can be filled with concrete onsite for additional reinforcement. The use of stronger, more lightweight types of concrete such as autoclaved aerated concrete (AAC) is becoming increasingly popular in CMU manufacture.

) foundation on a different site.

Image #2 (bottom of page) shows the home from the front. Image #3 shows the bare CMU on the above-grade portion of CMU foundation.

But it is Image #1 (right) that is the real puzzle. Here are the puzzle pieces:

read more

Do Humidifiers Create IAQ Problems?

Prime: 
prime

Subtitle: 
Adding water vapor to your indoor air may do more than you think

Images: 

It’s that time of year when heating systems start coming out of their summer hibernation. (Except maybe in Vermont. Michael Blasnik’s Nest data showed that Vermonters are about the last to start heating their homes in the fall.) Then everyone starts looking for their lotion and lip balm. Gaps appear in hardwood flooring as it dries out. Buildings begin to creak and pop. And then the humidifiers come out.

Yes, humidifiers can help with low indoor humidity. But what effect might they have on indoor air quality?

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