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Installing an ERV in an Unvented Attic - GreenBuildingAdvisor I’m finally done with the insulation project and trying to move on ERV project I have bought Panasonic FV-10VE1, have some questions regarding ERV and unvented attic The insulation on […]
Should I block the gable vents now that the house has new ridge vents . . . John, 1 The traditional advice would be to block the gable vents Research shows that the most effective combination of attic vents is soffit vents + ridge vents, without any gable vents 2 In reality, however, either way is fine -- because attic venting is less important than most people think For more information on this issue, see All About Attic Venting 3 Although Charlie is right
Adding a ridge vent without vented soffits - GreenBuildingAdvisor Jacob, Q "Is there is anything wrong with adding a ridge vent knowing they have no soffit vents?" A Yes If the house has a leaky ceiling -- most houses do -- adding a ridge vent without sealing all of the ceiling air leaks can make things worse The new ridge vent contributes to attic depressurization, and the result is that more conditioned air is pulled through the ceiling leaks, raising
Can too much soffit and ridge ventilation actually hurt a house if the . . . In a poorly sealed house roof venting can increase the stack effect - meaning more air entering the house at the base, and exiting into the attic That's why the recommendation is to have more vents at the soffits than at the peak, which slightly pressurizes the attic, reducing exfiltration
Using RockWool in between roof rafters? - GreenBuildingAdvisor From what I understand the conditioned space should be at the slope of the roof if my duct work will be up in the attic, would putting RockWool insulation in between the rafters be acceptable?
A New Look at Conditioned Attics - GreenBuildingAdvisor The problem is attic ductwork The main reason that anyone talks about conditioned attics is that some builders want to install ducts in the attic Installing ducts in an attic is a bad idea, but many builders don’t know that While locating ducts in an attic reduces installation costs for the builder, it increases energy costs for the homeowner
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
Air Leaks From Your Home To Your Attic Need To Be Sealed It’s important to keep attic air out of the house and house air out of the attic That's why the home performance industry and every above-code building program make it a top priority to fully separate attics from the rest of the building When the attic isn’t fully air sealed from the living space and the combustion appliance zone, three undesirable scenarios can occur: