David Williams
  • Male
  • Belgrade, MT
  • United States
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Latest Activity

David Williams commented on Christopher Morin's blog post Can you trust your Load Calc Software?
"A four year (hourly) monitoring and verification project has proven the need for passive solar gain calculations in heat dominant climates.  We have found up to 45% discrepancy between yearly energy use measured vs. modeled.  Wile the heat…"
Mar 17
David Williams replied to Bob Blanchette's discussion Gas meter "constant" charge.
"Bob, is there a mechanism that compares the amount of gas that enters that pipeline circuit and compares it with the amount that is metered and billed.  Accounting for losses in the delivery infrastructure must be included in the rates, but I…"
Dec 18, 2013
David Williams commented on Home Energy Magazine's blog post December 9, 2013...Will It Go Down In Weatherization History As The Day That Changed The Future?
"  Tedkidd might be on to something with program accountability.  I recently spent time in the crawl space, of a building that is owned by the government agency that administers the WAP program in my area.  I informed the director that…"
Dec 18, 2013
David Williams commented on Home Energy Magazine's blog post December 9, 2013...Will It Go Down In Weatherization History As The Day That Changed The Future?
"Meg has my attention and I share her philosophy on VERIFICATION.  The DOE has become a government beast with many heads and tails. Neither looking in the same direction nor wagging at the same accomplishments.  Standardized testing, with…"
Dec 18, 2013
David Williams replied to Kevin's discussion Underground ductwork
"What about Mold??? "
Sep 19, 2013
David Williams replied to Bud Poll's discussion HDD and internal gain.
"I am curious as to which energy modeling tools have been providing accurate results for the experts in this community?  Has anyone reviewed results from Greenbuild Studio (autodesk Revits' cloud based analysis using eplus as its'…"
Jul 22, 2013
David Williams replied to Bud Poll's discussion HDD and internal gain.
"Bud,   I have been collecting hourly energy use and environmental data for two homes for nearly four years.  One is superinsulated with minimal solar and internal gains (seasonal home)  and the other is a passive solar primary…"
Jul 19, 2013
David Williams commented on Bijou Lulla's blog post Solar Energy + Energy Efficiency – time to sing the Duet?
"Do not forget to consider Passive Solar Design for heating and day lighting solutions.  We can offset 30 to 50% of the annual heating needs (depending on location) with common sense design.  A proper design will also temper the summer…"
Apr 18, 2013
David Williams commented on Robert Riversong's photo
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Thompson SFP House Detail

"Extruded (of course).  I also like the way that you achieve the R15 edge requirement.  I have modeled energy loss comparing 2" XPS with 1" XPS in well drained + soils climate zone 6. and have reservations about the added cost of…"
Sep 6, 2012
David Williams commented on Robert Riversong's photo
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Thompson SFP House Detail

"Do you have a moisture barrier below the slabs' EPS?  I have found that a 1" layer of sand, placed over the EPS helped to protect both the insulation and vapor barrier.  This may have also provided some amount of moisture control…"
Sep 6, 2012
David Williams commented on James White's group Building Simulations
"Can you describe your data acquisition method and sensor type/location. I just completed 24 months of hourly monitoring on a passive solar residential building and have a Very large excel file of data that has been evaluated in many different…"
Sep 4, 2012
David Williams posted a status
"30 years of energy modeling and design using passive solar principles. Evaluating and confirming the end results is critical."
Sep 4, 2012
David Williams joined James White's group
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Building Simulations

Work collaboratively to find easier, more accurate and better ways to model, predict and verify a home's energy consumption.
Sep 4, 2012
David Williams replied to Chris Laumer-Giddens's discussion Designing for High Performance: Slab-On-Grade, Part I – Controlling Moisture Flow in the group Best Practices (Residential)
" I just left a job site where the builder is convinced that he followed the IECC 2009 heated slab on grade specifications for zone 6 (Montana).  He passed local inspections so I am now second guessing myself.  He has 2 inch EPS …"
Aug 30, 2012
David Williams replied to Chris Laumer-Giddens's discussion Designing for High Performance: Slab-On-Grade, Part III – Controlling Air Flow in the group Best Practices (Residential)
"Does the insulated Zip R-panel allow water vapor to pass to the outside, for cold climate installation?"
Aug 30, 2012
David Williams replied to Chris Laumer-Giddens's discussion Designing for High Performance: Slab-On-Grade, Part III – Controlling Air Flow in the group Best Practices (Residential)
"Have you properly addressed the below slab insulation requirements (based on the climate zone of this building site) according to IECC 2009??"
Aug 30, 2012

Profile Information

Company
Homestead Alternatives
Professional Certification
BS AAS Solar Engineering Technology, Mechanical Engineering Technology
Professional Interests
Passive Solar Design, Energy Modeling, Building Efficiency Evaluation, Common Sense Construction and Design.
Website URL
http://homesteadalternatives.com

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At 6:20am on April 19, 2012, Diane Chojnowski said…

Hi David,

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!


Thanks!
Diane, HEP Moderator

 
 
 

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Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
8 hours ago
tedkidd commented on Diane Chojnowski's group Hall of Shame
"Give this thread a bump - here's my "bad" album and some of the…"
8 hours ago
Eric Kjelshus commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"6) Radiant barrier- under the gravel is just a barrier but with holes each square inch its not a…"
8 hours ago
tedkidd replied to Luis Hernandez's discussion Distribution Efficiency and heating safety factor in TREAT in the group TREAT Software
"It is very common to find equipment grossly oversized. I mean 1.5 - 2x Manual J and 2-3x the size…"
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tedkidd replied to Luis Hernandez's discussion Basic Heat loss information in the group TREAT Software
"Luis,  Click "selected reports, energy savings and use, design heating and cooling…"
8 hours ago

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