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What is a Good Outdoor Humidity Level for Painting the Exterier of a House

Asked on Jul 5, 2010Improve / edit this question

4 Answers

Daniel Snyder   L6: Pro (Ambassador: L2)   367 answers   +915 votes
This answer has +5 votes  by

http://knoji.com/useful-tips-for-exterior-home-painting/

Read the manufacturer’s recommendations on the label of the paint you plan to use and then act accordingly. It depends on the type of paint being used, also if you are spraying or brushing on the paint has an effect.  Conditions should be 60° F. to 85° F, 40% to 60% relative humidity during the time of application and for a period of at least a week after, though this is not always practical.  When humidity reaches above 70% the evaporation of water from the latex paint film is suppressed. Avoid painting on those days when humidity is excessively high.
 

 

Posted on Jul 5, 2010
Chris Bucklin   L2: Contributor   15 answers   +2 votes
This answer has -5 votes  by

For any regular exterior paint you want it 55 degrees to 80 degrees for best results. (Don't spray paint your house, the dripping looks terrible.) Humidity is not actually a big problem like Daniel said. I am a painting expert (I live in Seattle) and it is always very humid, you just want it to be sunny that night atleast. Humidity is not a problem because it simply means the air is wetter, which in no way will evaporate the water in your paint, as long as it is under 80 degrees. Have fun painting!

Posted on Jul 6, 2010
Daniel Snyder   L6: Pro (Ambassador: L2)   367 answers   +915 votes
This answer has +4 votes  by

I respect Chris' expertise with painting in Seattle, but most manufacturers agree that when latex-based paints are applied at too low a temperature, they will not dry and cure properly, leading to poor adhesion and reduced durability and high humidity conditions can result in the same types of problems as painting in low temperatures.  The slow drying time may also result in sagging.

Paints and primers should not be applied when the humidity is too low or too high. Low humidity conditions can lead to the same problems as painting in high temperatures.
 

Posted on Jul 6, 2010
Morgan Hill   L1: Member   1 answers   +3 votes
This answer has +3 votes  by

Chris, I think you misread the first post.  Daniel did not say that the water would evaporate too quickly, but that it would be slowed (suppressed) when the humidity is above 70%.

 

Posted on Jul 6, 2010

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