I am involved in a QC program that straddles two of the four zones BPI uses to identify LBL "N" factors. Has anyone ever seen a map with enough resolution that could help determine whether a project lands in one zone or another? My area of concern is the division between zones 3 and 4 in southern California.  

Has anyone correlated the LBL N-factor zones with California Energy Commission climate zones?

With a requirement to meet ASHRAE standards, the 15% factor difference between zones could be significant.

Views: 1740

Replies to This Discussion

If you are in doubt, just use the middle value common to both zone 3 and 4:  23. 

 

The whole formula isn't all that precise anyways.  The N factors for each zone are a range of four numbers - that should tell you something.  Using the lower number will allow you to seal up a house tighter without having to do ASHRAE 1989.   But to meet ASHARE 62.2 - 2010, you probably have to install some kind of ventilation anyways - the only question is what cfm rate to set the fan at.

 

If you want to be more precise, use ASTM 779 and ASHRAE Standards 119 and 136 to calculate your own N factor instead of using that burry map.

 

RSS

Discussion Forum

BPI is Hiring!

Started by Quinn Korzeniecki. Last reply by Diane Chojnowski Jun 29. 1 Reply

Latest Activity

Profile IconTroy Spindler, Mike Berg, Andrew McDowell and 4 more joined Home Energy Pros Forum
21 minutes ago
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's…"
18 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Interesting idea. Commercial roof on a slope! Typical density for roofing spray foam is 2.5 to 3.0…"
19 hours ago
Summer Redman added a discussion to the group Job Board
Thumbnail

Hiring 2 Training Specialists in Champaign-Urbana, Illinois

The Applied Research Institute (ARI) at the University of Illinois at Urbana-Champaign is seeking…See More
20 hours ago
Summer Redman joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
20 hours ago
Profile IconCrystal McLain, Robert Grindrod, Rich Wickman and 3 more joined Home Energy Pros Forum
yesterday
Stacie Bagnasco replied to Evan Mills's discussion Dirty solar panels
"This is a great idea. I clicked on your discussion because it made me remember that I forgot to get…"
yesterday
Kirsten Richnavsky posted an event
Thumbnail

rCloud - The Future of Testing at Your Office or Home

October 18, 2017 from 2pm to 3pm
Integrating rCloud as an essential part of your RESNET QA process.Retrotec’s rCloud app is here,…See More
yesterday

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service