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Q&A Spotlight A Queens renovation needs seven HVAC zones but has a heating load of only 25,000 Btu/hr. Can a multi-split heat pump work? By Chuck Bickford | July 27, 2026 Designing an HVAC system is one thing. Designing one with seven zones, a tight heating load, limited space, and a client who has already […]
The question of how deep a ventilation space is required for over-roof ventilation in an extreme snow region (climate zone 7) to keep the underside of the roof sheathing close to the exterior temperature (to prevent ice damning) is required has come up—builder wants 1 1/2″? This particular roof has R-70 rigid above the roof […]
Hi all, my 2nd story floorplan calls for a closet that extends over the stairwell (drawing below). The code-required 6’8” headroom makes it so that a dropped joist won’t fit here to support this part of the subfloor. So I’m assuming I’ll need to use a joist on top of the framing, but I’m not […]
Here’s what 4 different AI engines say about it. Is their logic sound, or is it off? ================================================================= chatGPT ================================================================= Regarding your three-layer roof assembly You’ve already raised an excellent question about stacking three layers of 2-inch Poly ISO 2. If the grooves happen to line up perfectly: void depth = about 1/8 inch width […]
Hi, I was planning on insulating my basement walls and slab. It has never been wet or showed signs of water intrusion in 10 years. I have found a good price for polyiso with asphalt backing on Facebook marketplace. I don’t know the properties with the asphalt backing. Will it be vapor impermeable at 2 […]