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Are Powered Attic Ventilators Ever a Good Idea? There is no vapor or reflective barrier on the attic ceiling, just wood and nails During the day our house stays relatively cool with all the windows closed But come around 7pm until about 11pm it’s hotter inside than out (all windows open now), and from a thermal camera it looks like the attic is dumping stored heat down into the house
Is Venting an Unconditioned Attic Necessary? A reflective metal roof keeps an attic much cooler than passive ventilation Photo courtesy of Cameron Taylor For the second problem, cooling costs, attic ventilation supposedly reduces cooling costs in the house Yes, ventilation can keep the attic cooler, but that doesn’t translate to lower air-conditioning costs
How to Insulate and Air-Seal an Attic Hatch Even though attic hatches can be huge air leaks and sources of radiant heat loss, they are rarely fixed An attic hatch is usually located in a hallway or closet where the homeowners see it daily Yet… I mean, once the homeowners fire up a blower door and whip out their infrared camera, the problems with attic hatches are pretty obvious
Fans in the Attic: Do They Help or Do They Hurt? Attic Fan (roof mounted type) and ceiling shutters ? When I was about 16 my father installed an Attic power vent fan We had a small house about 1000sf The house had a removable cover to get into the attic If the entrance cover was left open, and the fan came on You could fell the rush of air being pulled into the attic Present day
How to Insulate and Air-Seal Pull-Down Attic Stairs Pull-down attic stairs are super-sized attic hatches that just beg homeowners to store more stuff in their attic Besides the air-leakage and insulation problems stemming from having a particularly large hole in your ceiling, pull-down stairs creates a potential storage headache For homeowners, a storage problem usually means “not enough space ” For energy auditors, a storage problem
Controlling Humidity in an Attic with Spray Foam Insulation The upper yellow dots are the outdoor high temperature for each day, the blue curve is the attic temperature, and the orange curve is the attic relative humidity Temperature and humidity data for spray foam attic in summer 2020 The attic exhaust fan ran continuously until 5 August and then was turned off
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
How to Air-Seal an Attic Access - GreenBuildingAdvisor The wooden folding attic stairs (ladder) fits inside the box when lifted into the ceiling attic The box is sealed by using two velcro straps at either end, connecting the box to the attic floor Keeps the weatherstripping tight to the attic floor, and easy to remove and replace the lightweight box hatch
Installing an ERV in an Unvented Attic - GreenBuildingAdvisor The attic stale air pickup should be near the ridge because usually the highest humidity is there, this is the air you want to move out of your attic This hot humid air that is pulled out will now be supplied with conditioned air from the house thus indirectly conditioning your attic
Blown Insulation for Attics: Fiberglass vs. Cellulose 1500-sq -ft attic Numbers vary by manufacturer, but according to CertainTeed’s table, you need a minimum insulation thickness of 181⁄ 2 in and at least 25 2 bags of insulation per 1000 sq ft Adjust the bag count to your attic’s area: (25 2 x 1500) ÷ 1000 = 37 8 bags If your contractor installs less than 181⁄