I concur with M. Johnson. This Web-site ought to be renamed greenbuildingadvisortonorthernclimatenewconstructors.com. It can be pointless to debate irrespective of whether jogging ductwork in conditioned Room in Texas is feasible. Simply because 99% in the households below ended up/are created with ductwork located in unconditioned attics. As homeowners of existing Texas Qualities, we could all abandon our improperly ducted properties in favor of northern-development-standard homes (Value prohibitive in addition to a wasteful usage of sources) or do the top with what we've got. I measured a twenty diploma drop in attic temp when I set up radiant barrier on the underside of rafters. By undertaking this installation alongside a roof pitch, nevertheless my leading facet may possibly collect dust over time (cutting down reflectivity), The underside facet must continue being reasonably dust free of charge (keeping a minimal emissivity).
If I had been To place the XPS in the inside most Element of the stack would not the foil block the XPS from drying in to the vent gap?
I was somewhat shocked by your feedback that "Up north, a sun-warmed attic helps lessen heating costs." Um, perfectly, not in upstate NY, not unless you want ginormous icicles. A properly insulated roof (generally a chilly, well ventilated attic) is the way to avoid ice dams, h2o backing up underneath shingles, and icicles. So building the roof take in significantly less warmth is usually a superb detail for us (and even in the attic-significantly less circumstance, the roof is usually coated with snow throughout the cold months so the roof heat absorptivity is a non-issue)
Warning: Any attic insulation job that’s working with mildew or asbestos ought to constantly be managed by an expert. They are destructive substances that has to be disposed of in a specific way in an effort to preserve you and your spouse and children Secure from harm.
That proven fact that solid objects in the same room are distinctive temperatures doesn't suggest that a person or one other is just not nonetheless radiating warmth. They are ALL even now radiating some degree of warmth on a regular basis, though the net exchanges might favor a single or another as matters locate short-term equilibrium. Even the cold beer is radiating warmth, Whilst, as you say, it really is accepting additional heat via various mechanisms than it is offering off. Put within the infra-purple goggles. Just because the beer is colder than its surroundings doesn't necessarily mean it nevertheless just isn't radiating heat. So, mainly my 'splitting hairs' criticism was that to convey: "Because the drywall is at space temperature, it isn’t emitting any radiant warmth" is factually incorrect.
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She received her start out in Life style producing and enhancing at Oprah Journal and more just lately sharpened her home restore and style and design capabilities at websites like The Spruce and HomeAdvisor.
You could look at replacing as much of your attic ductwork as you can with new insulated flex duct. In the past, flex duct was frequently insulated to only R-four; Garage door insulation it is currently possible to purchase R-eight flex duct. In the event you do that perform, make certain you understand how to seal duct seams to avoid leakage.
A Florida Photo voltaic Electrical power Center analyze, As an example, measured a 26% reduction in ceiling warmth flux with the addition of the radiant barrier beneath the roof, and Martin himself quotations A variety of values exceeding that.
It truly is tough to forecast the payback period for your proposed $three hundred investment, since you will discover a lot of variables from the equation. It's Protected to claim that installing the radiant barrier while you suggest might help lower your attic temperature (at the very least until eventually the radiant barrier receives dusty).
Observe that reflective foil will carry out energy, so employees and homeowners will have to steer clear of earning contact with bare electrical wiring. If installed in addition to attic ground insulation, the foil will probably be prone to dust accumulation and should lure dampness in fiber insulation, so it's strongly advised that you just NOT use radiant barriers immediately along with the attic flooring insulation.
As it doesn't cost Considerably much more than ordinary roof sheathing, it makes sense to install it on new very hot-weather residences."
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The ducts are elevated much over the attic flooring in many situations and connected to truss supports with strap product.