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Does air movement (wind washing) through a vented cathedral ceiling cause heat loss through the insulation? This article describes the best methods for ventilation in a cathedral ceiling and the effects on heat loss of air movement through a ventilated attic or cathedral ceiling.
The question-and-answer article below paraphrases, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss.
Wind Washing: Does airflow in a vented cathedral ceiling cause unwanted heat loss from the building? Sketch (left) showing how wind washing steals heat from fiberglass insulation is courtesy of Carson Dunlop Associates. Anything that induces (causes) airflow through a fiberglass insulating batt will reduce the effectiveness of that insulation, since fiberglass works by reducing air movement. In laboratory experiments, a 3-inch fiberglass batt on an attic floor had a 29-percent reduction in R-value caused by air flowing across it at 2 mph.
In another experiment, 6 inches of loose fill fiberglass had a 14 percent reduction at similar airspeeds. With the thicker fiberglass insulating batts in contemporary use, the reductions in insulating value caused by air movement across the fiberglass surface will be less. Also it is unlikely that airflows across insulation in a cathedral ceiling will reach this speed, even under extreme conditions. To be safe, you could build a baffle such as you suggest, or use manufactured baffles,such as ProperVent.
If you are going to the trouble of making your own baffle, use something like perforated foil board (Dennyboard or Thermoply). Drywall is probably not an ideal product for an inter-rafter air baffle over the cathedral ceiling insulation since drywall can get soggy if there is excess condensation or a roof leak. At INSULATION LOCATION for CATHEDRAL CEILINGS we describe a high-labor method that combines providing an air barrier above fiberglass insulation in a cathedral ceiling to avoid heat loss by air movement in the roof, combined with the addition of solid foam insulation to provide a much higher R-value for the completed cathedral ceiling structure. Bliss points out in the original Q&A on cathedral ceiling ventilation, the risk of forming a vapor barrier sandwich around fiberglass ceiling insulation (foil faced insulation above and poly vapor barrier below) is that any moisture entering the insulation will be trapped, risking future mold or rot problems. Interior sealing: Be sure that the room side of the cathedral ceiling is sealed meticulously against air leaks, such as by using a 6-mil polyethylene vapor barrier on the warm side of the insulation (in a heating climate) and careful workmanship, gaskets, sealants around any ceiling penetrations for electrical wiring or fixtures.
Exterior inspection: monitor the condition of the roof from above, with an annual inspection - unattended leaks on any roof structure can lead to costly rot, insect, or mold damage, but on a well-insulated, sealed cathedral ceiling roof, leaks from above can go for quite a while without notice from inside the building.
Another possibility would be to perforate the kraft paper on the insulating batts and face the paper up in the roof cavity. The question-and-answer article about the effects of airflow on loss of R-value in fiberglass insulating batts, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss. In my proposed cathedral ceiling detail [sketch at left], I want to use a reflective foil between the insulation and the roof sheathing to double as a radiant barrier and a cathedral ceiling ventilation space liner. Second, in winter a continuous layer of foil above the insulation in a cathedral ceiling creates a cold-side vapor barrier, vulnerable to condensation on the underside. Most builders and designers feel that a lining material is not necessary in the airspace of a cathedral ceiling except at the eaves [to avoid wind-wash or moved insulation].
For extra protection from wind, some builders line the space with a housewrap material such as Tyvek. At ROOF VENTILATION IMPROVEMENTS we give suggestions for improving the performance of roofs that are not easily vented.
Continue reading at CATHEDRAL CEILING INSULATION or select a topic from the More Reading links or topic ARTICLE INDEX shown below. During times of high humidity the ceiling boards get wet yet it appears that there are no leaks so I figure it is a condensation problem. You are adding air space, maybe, but also halving the R-value of the roof, increasing heat loss, increasing heating and maybe cooling bills, and increasing the chances that the ceiling cavity reaches the dew point (thus more condensation).
POST a QUESTION or READ FAQs about Venting Cathedral Ceilings - what is the proper way to vent cathedral ceilings? POST a QUESTION or READ FAQs about Venting Cathedral Ceilings - use of reflective foil- original PDF version, use your browser's back button to return to this page or jump to the updated text at Use of Radiant Barrier Foil in a Cathedral Ceiling? ASES leads national efforts to increase the use of solar energy, energy efficiency and other sustainable technologies in the U.S. Steven Bliss served as editorial director and co-publisher of The Journal of Light Construction for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines. John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. ASHRAE resource on dew point and wall condensation - see the ASHRAE Fundamentals Handbook, available in many libraries. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Kuechen-Badezimmer generiert jahrlich rund 2000 Anfragen von privaten Hausbesitzern, welche ihre Kuche, ihr Bad oder ihre Sauna neu- oder umbauen mochten.

Den Badezimmer Ratgeber konnen Sie kostenlos herunter laden, wenn Sie einen Badbauer (siehe Liste links) bezuglich dessen Unterlagen anfragen. Sie mochten Ihr Bad teilweise oder komplett umbauen und suchen dazu die passenden Badezimmer Ideen, die Sie zu Ihrem perfekten Bad inspirieren? Lassen Sie sich durch Bilder von verschiedenen Badezimmern inspirieren, die einem einen Einblick geben, wie das eigene Bad spater einmal aussehen konnte. Lassen Sie sich durch unsere Bilder-Galerie inspirieren und finden Sie Ihren personlichen Stil.
Uberlegen Sie also zuerst, was Ihnen gefallt und sollten Ihnen das nicht gelingen, so lassen Sie sich doch einfach von unserer Bilder-Galerie inspirieren. Viel Tageslicht und Aussicht in die Natur:  Machen Sie Ihr Badezimmer zu einem Ort der Entspannung, wo Sie die Zeit in Ruhe geniessen konnen. The original Tastic was an IXL brand name but it has become the common term used to describe any brand of bathroom combination fan-light-heater. These units are now available from a wide range of manufacturers and if you are planning to upgrade from your old model to a new one, there are a few things you need to consider. Unless you are replacing your old bathroom Tastic with exactly the same model you need to check that the the new unit will fit the existing hole in the ceiling. For free quotes and advice on repairing, replacing or installing new bathroom Tastics, phone us at Mance Electrical on 6331 4711. Subscribe To Our NewsletterJoin our mailing list to receive tips on keeping safe around electricity, money saving ideas and information on new products. So Quiet You Might Not Know it's On This WhisperCeilingT model features a totally enclosed condenser motor and a large, double suction blower wheel to quietly move air.
Energy Star® Qualified for Energy Savings Energy Star qualified products feature super-quiet operation and high CFM-to-Watt efficiency. To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. I have a old house and we have a light fixture at the top of the stairs with a switch at the top and the bottom. Since there's no standard for the orientation of a switch, top, bottom, left and right have no meaning. Also, when wires are connected to devices, there are some conventions about colors and there are times when it's at the discretion of the installer.
Pull the two switches out of the wall far enough to see all of the terminations and all wires in the box behind each switch.
It basically is set up like the pic, except the power line and line running to the light fixture are in the same switch box. When power in and power out comes in to the same box the black of power in will be spliced to one of the wires in the 3-conductor cable and that wire at the second switch will be connected to the common.
Tell us about each cable that enters each box, the number of wires, by color, in each cable, and how each wire is terminated or spliced.
Code note the white of the three conductor cable in this configuration must be recolored on both end to indicate it is used as an ungrounded conductor. Sketch above showing venting in a steep-slope cathedral ceiling roof is courtesy of Carson Dunlop Associates. Air flowing across a fiberglass batt, however, should not seriously reduce the insulation's R-value except with very thin batts and very fast air movement. Of course you will have to install a continuous poly vapor barrier below the insulation as well. As you'll notice in Carson Dunlop's sketch at the top of this article, experienced home inspectors and other building professionals recommend a 3-inch air space.
At the eaves a rigid baffle is recommended to keep the insulation in place and to keep wind out of the insulation. If you want to add air space to vent the cathedral ceiling, and you're going to the remarkable cost and trouble of removing and reinsulating, why not do the job right with high-R solid foam insulation, an air space, and careful workmanship to assure that air flows in at eaves, out at ridge, and that thdre are no air leaks into the cavity. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. City, Average Reductions in Ceiling Heat Flow due to Radiant Barrier, Table of Typical Heating Equipment Efficiencies, Table of Cooling Load Factors for Radiant Barriers by U.S.
The text is intended as a reference guide to help building owners operate and maintain their home effectively. Es gibt unzahlige Moglichkeiten, mit deren Hilfe Sie Ihr Badezimmer grosser oder kleiner erscheinen lassen konnen, die Ihrem Bad ein mediterranes Flair einhauchen oder es unter Berucksichtigung des Feng Shui zu einer Wohlfuhl-Oase fur Korper und Seele machen. Machen Sie sich jedoch zuerst einmal Gedanken daruber, welchen Stil Sie fur Ihr Bad bevorzugen und welche Einbauten es unbedingt haben sollte, so dass Sie im Anschluss gezielter suchen konnen. Schauen Sie, welche Ideen Ihnen zusagen und nehmen Sie im Anschluss Kontakt mit den entsprechenden Experten auf, die Sie gerne weiterfuhrend beraten, naturlich vollkommen unverbindlich und kostenlos. Wohnberaterin wertvolle Tipps und Ideen fur Ihre neue Kuche oder Ihr neues Bad.Dazu gehoren funktionale und ergonomische Ideen sowie Tipps bezuglich Stil und Farbgestaltung.
A small wheel turning very fast will create more noise than a large wheel turning more slowly for a given airflow.

The Energy Star program was created to help consumers identify products that can save them money and protect the environment by saving energy. This Panasonic fan has a built-in damper to prevent backdraft, which helps to prevent outside air from coming through the fan.
Problem is, it doesn't work like a 3-way switch, but they are actually 3-way switches and wired as such. You can mount them any way you want and position of the terminals vary from manufacturer to manufacturer. The common terminal is usually distinguished with a dark screw, and the traveler terminals have bright brass screws. That and there's two whites twisted together inside AMD two blacks twisted together inside that same box. Readers should see INSULATION R-VALUES & PROPERTIES our own table of insulation properties that includes links to articles describing each insulation material in more detail. Doch bringen Ihnen auch die besten Badezimmer Ideen nicht viel, wenn Sie nicht wissen, nach was Sie eigentlich suchen und was Ihnen gefallt.
Denn wenn Sie ein Bad haben mochten, das im Stil von 1001 Nacht zu den wunderschonsten Traumen inspirieren soll, Sie jedoch bei Ihrer Suche nach Ideen ungenau suchen, werden Sie viel Zeit opfern, die Sie ansonsten schon in Ihrem neuen Bad verbringen konnten.
Auf diese Weise finden Sie bestimmt das Bad, in dem Sie sich so rundum wohl fuhlen und entspannen konnen. I as thinking maybe they were wired incorrectly or maybe the switches just went bad from being so old. For the switches to work properly, the pair of switches has to be wired so that the hot unswitched feed wire from the panel is terminated to the common screw on one of the switches and the hot fed wire going to the load is connected to the common terminal on the other switch.
If any wire is terminated by being pushed into a back-stab hole, change that connection to go to the screw terminal instead. Our mission is to inspire an era of energy innovation and speed the transition to a sustainable energy economy. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. The blower wheel is also designed to draw air in from both sides, which helps keep the noise down, as there is more area for the air to enter the wheel. Loose fill or batt insulation can be placed directly over the fan housing to prevent heat from escaping.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. When contact with the high speed (red) wire is opened - the countdown begins to turn the fan down to the continuous operation (low) speed.
If it is used as a traveler I'd mark it the same color as the other traveled but that is just me. Carson Dunlop Associates' provides extensive home inspection education and report writing material. Continuous, Trouble-free Operation for Many Years This fan is designed to give you continuous, trouble-free operation for many years thanks in part to its high-quality components and permanently lubricated motors which wear at a slower pace.
Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order.
This unique "electronic-brain" lets the fan do what was once thought to be impossible, perform at a constant CFM regardless of elbows and other factors that might hinder performance. Also, since heat is always detrimental to motor life (the cooler the environment, the longer the motor will last), we designed the electrical configuration of this model's condenser motor to allow it to operate at lower temperatures, increasing the life of the motor and bearings. Do you see a 2-conductor cable in each switch box in addition to the 3-conductor cables you mentioned? Basically, when a WhisperGreenT fan faces static pressure, its speed is automatically increased to ensure that the desired CFM is actually achieved. And, the fan housing is made of heavy-gauge zinc galvanized steel and painted to protect it from rust. This allows the fan to perform as rated and makes for easier installation because the installer no longer has to worry as much about compromising the fan's performance. The magnetic rotor prevents energy loss while the print circuit board incorporates a unique IC chip which monitors and directs the RPM of the fan blade. The combination of these two unique features allows the DC motor to have higher energy efficiency than an AC motor. This allows the fan to run continuously at a pre-set lower level of 30-70 CFMs that can then be elevated to a maximum of 80 CFMs when the switch is turned on, or via the SmartActionT Motion Sensor.

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