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- Lstiburek’s Rules for Venting Roofs - GreenBuildingAdvisor
Building Science Fundamentals: Roof, Part 1: Ventilation By Dr Joseph Lstiburek Dr Joseph Lstiburek talks about the not-so-controversial ways to maximize the efficiency and airflow of your roof and attic Video Transcript: There’s been so much stuff said about roofs that you sometimes lose perspective I’m going to start off by saying what might seem controversial but really shouldn’t be
- Attic ventilation connected to rain screen *with no overhang roof . . .
Community and Q A Attic ventilation connected to rain screen *with no overhang roof design* in a cold climate? Izzza | Posted in General Questions on December 28, 2023 09:57am
- Is R-8 Duct Insulation Enough? - GreenBuildingAdvisor
Attic temperatures are about 120°F And conditioned air inside a duct is about 58°F So the delta-Ts would be: I don’t know about you, but when I look at that, it seems we may be prescribing too little insulation for ducts in unconditioned attics The largest delta-T in the house has the lowest R-value Hmmmm
- Spray Foam Insulated Homes Need Ventilation
An energy-recovery ventilator (right) and a duct distribution box (center) in a spray foam insulated home Contractors who install spray polyurethane foam insulation put themselves at risk if they do so in homes without a plan for mechanical ventilation Image Credit: Energy Vanguard
- Blown Insulation for Attics: Fiberglass vs. Cellulose
Blown-in fiberglass consists of milled glass fibers like those used to make fiber-glass batts When it is blown onto an attic floor, it is referred to as loose-fill fiberglass This material has a lower R-value per inch (2 to 2 7) than any other common insulation product, so it’s best applied in an attic that has enough room at the eaves to accommodate insulation installed 16 in to 26 in deep
- Air-Sealing an Attic - GreenBuildingAdvisor
If you want to improve the energy performance of an older house, one of the first steps is to plug your attic air leaks Although many GBA articles address aspects of attic air sealing, no single article provides an overview of the topic This article is an attempt to provide that missing overview I’ll try to explain how you can seal air leaks in a conventional vented, unconditioned attic
- Fixing Attics With Vermiculite Insulation - GreenBuildingAdvisor
If an attic is insulated with a thin layer of vermiculite — a layer that provides less than the minimum R-value required by code — it’s hard to come up with a good way to improve the insulation layer, especially if the ceiling has air leaks Addressing attics with vermiculite is a particular challenge for weatherization agencies
- Fixing Problem Ductwork - GreenBuildingAdvisor
With the guidance I provide in this article, you can go into your attic, basement, or crawlspace and spot the problem areas And then you can fix your duct system Fundamentals of ducts for heating and cooling systems Before I dive into the problems and fixes, though, let’s review the fundamentals of heating and cooling with air
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