Recent Q&A

• Any CPHC’s on board?

  Hello, I am building my first passive house (currently designing it) in Indianapolis. I am PH certified builder, this will be my first passive house, and I am building it…

• When is an ERV needed?

  How tight does a house need to be at ACH 50, before an ERV or HRV is recommended?

• Cellulose vs. stabilized cellulose?

  Most of the cellulose going into walls here is stabilized cellulose. We had a new insulation contractor tell us this week that he will only put in loose cellulose in…

• Can EPS foam be used under the concrete slab?

  EPS is about 1/3 the cost of XPS. We are using underslab hydronics, and would like to save the money if it's a viable product. Is there anything wrong with…

• What’s better: 4 inch SIPs with 2 inch XPS or 6 1/2 inch SIPs only?

  This question is just about efficiency, not about cost. The house will be Thermocore SIPS, but we are trying to decide on 4" SIPS with 2" XPS on outside, or…

• 是开孔泡沫appropriate for spraying the bottom of a roof deck?

  We are building in Indianapolis, middle of zone 5. House will be on a slab, under-slab hydronic heat powered by geothermal, 4" Thermocore SIPS walls with 2" of rigid foam…

• How to attach rigid foam to the outside of the walls? And is it a good idea?

  I am building a house in Bloomington, Indiana, which is right on the line between 4A & 5A zones. I am wanting to add 2" of rigid foam to the…