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Eric, if you spend $1000 sealing windows and nothing changes, how will you feel?
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Eric M. Fletcher
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Winter condensation on windows in a house that is very well insulated.
53 Replies
This is my first post and I hope I have the formate correct, I live and build in central Pennsylvania. I built a house in 2004 using what I thought were the best practices at the time to insure it…Continue
Started this discussion. Last reply by Robert Riversong Nov 5, 2012.
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tedkidd replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated.
Robert Hamilton replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Robert. I suspect you are correct. Is there anything I can do to remedy "air sealing the perimeter," in a completed home?"
Robert Hamilton replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Eric,
I discovered your post while doing my own research on Crestline Windows and condensation. I live in the mountains of western NC; we have a similar climate to central PA (garden zone 6a). My home was built in 2002 with a complete…"
Robert Riversong replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."I build homes in northern New England with 8500 HDDs and winter minimum design temperatures of -10°. I agree that indoor humidity needs to be no more than 40%, but that much air exchange is not required to get there, as long as there are no…"
Ken wilson replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."I am referring to the terminology of the products used in the hvac trade by the vendors and tradespeople in the trade at least in the north central us climate. I am sure there are many products in the market that share the same common name. I own…"
Robert Riversong replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."No house needs 8 air changes per day, unless it's a very toxic environment. To meet the latest ASHRAE 62.2 ventilation standards (referenced in the IRC and state codes), a house needs in the range of 4-5 AC/day (0.16-0.24 ACH), depending on…"
Ken wilson replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."in general a home should ventilate approx, 8 air changes per day. As the home is tighter it will not have that amount naturally, so less than 8 air changes and any moisture produced through living in, cooking, bathing etc. is trapped inside and will…"
Robert Riversong replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."I don't know what you could possibly mean by "volume is NOT the measure" (of what?). ACH50, which is a volume air exchange metric, is the only one referenced in building codes and efficiency programs:
2009 IRC/IECC …"
tedkidd replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."The tool doesn't have the level of accuracy that would be necessary to split those nits.
Square footage and CFM50 are PLENTY to get you to the neighborhood for understanding relative value. Is it a highly accurate model, no.…"
Robert Riversong replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Actually, as raw data, CFM50 by itself is pretty meaningless, as a very small but leaky house could have a lower number than a very large and tight house.
What matters is ACH50 (CFM50 compared to whole house air volume), and CFM per square foot of…"
Robert Riversong replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."The older Energy Star (pre-2011) required no more than 5ACH50. 1.5ACH50 is extremely tight in today's new home market. The world's strictest standard - Passive House - requires only 0.6ACH50. No house can achieve 0.05ACH50.
You might want…"
tedkidd replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Awesome!
.05 ACH is great, but ACH is like telling someone how much they weigh per inch of height. Leaves a lot of opportunity for error or gaming or simply confusion.
CFM50 is the raw number. The total weight. Very…"
Eric M. Fletcher replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."not exactly sure but they said 1.5 is ok for the energy test they do for a local home building company to get energy star rated. I was showing .05. I will talk to them and get exact numbers "
tedkidd replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Nice JOB!!!
What was the cfm50 number? "
Eric M. Fletcher replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."Hello Robert, I first want to thank you for insight into this issue and responses. First I was wrong in that the house was built in 2000. Time flys. I followed the advise of getting a blower door test done and found that I had constructed the…"
Curt Kinder replied to Eric M. Fletcher's discussion Winter condensation on windows in a house that is very well insulated."I second that motion - I've used Panasonic Whisper Greens on a couple occasions to solve a thorny IAQ problem at minimal operating expense."
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- At 1:47pm on September 15, 2012,
Diane Chojnowski said… Hi Eric,
Welcome to Home Energy Pros. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!
Don't forget to upload your profile photo. And add your location on our Member Map.
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Diane, HEP Moderator
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