Recent Q&A

• Batt Insulation Attic Roof with Air Gaps between planks

  Hi all,We're looking to do some efficiently upgrades on our home (Climate Zone 3B Los Angeles) including better attic insulation, a new HVAC system and a new roof (metal).Our ducting…

• Unvented roof, Zone 3B, foam-free

  Hi Martin, First off, I have read a wealth of articles on the subject of unvented roofs, by yourself and Joseph Lstiburek. I started with your “How to Build A…

• Hot water re-circ line & vertical head loss

  Hi all, I’m trying to size a pump for our re-circ line. We have a 1 story house, with a tankless water heater in our attic at one end of…

• Dryer ducting — materials requirements

  Hi all, I've been finding so much mixed information regarding this all over the net. Some places specify only rigid galvanized steel is approved for in wall and attic, other…