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Unregistered
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Posts:2321
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| 04/04/2006 10:41 AM |
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I have a customer that is installing Radiant heat in the floor and the air conditioning units in the attic space. The question from the customer is " Will condensation build up on the ceiling deffusers because of them extending threw the insulation into untreated space in the attic?" I Sell SIP's ( Structural Insulated Panels ) I told my customer that I would check into this for him. I called some local heating contractors, they told me yes, condensation will form on the deffusers. They said that they tell their customers to stuff insulation in the pipe and cover the hole with plastic in the winter. Does anyone know how the prevent this??????? Or another idea.
Kevin Casey
Thermal Foams Inc.
kevinc@thermalfoams.com
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Davee
Registered Users
Posts:25
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| 04/04/2006 12:17 PM |
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| You might consider a split A/C with only the air handler in each room needing A/C There is no air exchange into the attic & only feed & return lines to outside. Maybe more expensive but avoids the extensive heat pick up of ducts in the attic. You can also control the cooling in particular rooms to cut operating costs further. Your original question using ducts in attic -- UR subject to Mother Nature & she will condense for sure. |
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Unregistered
Registered Users
Posts:2321
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| 04/26/2006 2:30 PM |
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I've been an HVAC tech for 5 years and I NEVER saw a diffuser or grille that had condensation on it (in the winterime)! Firstly, the grille has no contact with the duct at all! It is mounted to the ceiling surface. Secondly, most installers are using plastic "boots" which are attached to the surface of the ceiling board on the attic floor side. Thirdly, all the rigid trunk ductwork should have insulation padding (acts as sound absorbtion also). Fourthly, some old school installers denigrate "flex" use. But, it is much better for many reasons. That is insulated. Fifth, a grille or register has the possibilty of being colder than the room temperature (causing dew to form) only if the attic is actually cold enough to create a large enough temperature difference AND heat is conducted thru the grille into either the air in the duct or boot or directly into the ductwork. The first, second, and third points I've made preclude that route and duct work is small enough and curvaceous enough to make convectional exchange almost non-existant. The only place you might get a problem is if, and where you wouldt have a large metal box which makes up a return grille area. But, this box should be covered with insulation in the attic.
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