Recent Q&A

• Calculation of Btus generated during Heating

  I am writing an article for the GBA and wish to depict a graph of the Kwh used by my Ground Source Heat Pump vs. the outdoor temperature. On that…

• Help finding flashing attachment for solar panel racking

  Yesterday, November 28th 2018, there was an advertisement in the Blogs section of the GBA for a new flashing attachment for the racking system for solar panels. I would like…

• Modeling of HERS Score parameters

  Why are HERS score parameters for GSHPs modeled with the "equipment performance data from the nameplate" while ERVs are modeled "according to how it's designed to operate". The quotes are…

• Flexible, Long Lasting, Sealant

  In upper CZ-4, I will be placing Huber Zip R-6 panels ( with 1" of PolyIso on the interior) against 2x6 stud walls and plates. I would like to use…

• Blower door tests and Equivalent Leakage Area

  在阅读Lstiburek博士的书系列Bui。lders Guide to... 'name your climate'", I concluded (though it was never specified quite clearly) that for 1000 CFM at 50 Pa the EqLA…

• ICF & Dimple Drain Board

  My contractor has a concern that the dimples on Dimple Drain Board will gradually press themselves into the foam of ICF and eliminate the drain space ( due to the…

• Connection between GSHP and Zehnder’s ComfoFond-L

  I wish to make a connection between the ground loop of a Ground Source Heat Pump and the air tempering unit of a Zehnder ERV ventilation system, the ComfoFond-L (which…

• Clear 6-mil polyethylene vs. 10-mil proprietary sheeting

  In most of the correspondence at this site, I see clear 6-mil poly being used and recommended as an under slab vapor barrier. There is a proprietary brand of 10…

• Use of polyiso below a slab

  In CZ-4, I will be building a Net Zero slab-on-grade ranch, on a flat lot, on top of a ridge. All water drains away from the site. The slab itself…

• Paint as an Air Barrier

  CZ-4. Net Zero Energy Slab-On-Grade Ranch. Planning for 0.1ACH50. Huber Zip-R sheathing.