R Value For Attic Ductwork

It was new when the ac was put in 7 years ago.

R value for attic ductwork.

Here s how that 3 500 sf house would come out with those. What i m talking about is a house with ducts in unconditioned space especially an unconditioned attic. The higher the r value the pricier the ducting. Add insulation to attic.

R value of 3 5 is required for buried ductwork and ducts installed in an unvented attic with roof insulation or in an unconditioned space including both ventilated and unventilated crawlspaces. R value measures how well certain building insulation materials can resist heat. Not sure where you are at but here in florida the minimum r value for ducts installed in an attic or any unconditioned space is r 6. I called out the original hvac company and they took a look and said they saw no water.

The attic ductwork is flex duct work. Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water. Recommended insulation levels for retrofitting existing wood framed buildings. R value of insulated ducts flexible ductwork running in open space like an attic will be insulated from about r6 to r10.

Was your ductboard existing and you added a zoning system. If the contractor added all new ductboard and your local code requires r 6 then you have some ground to stand on. The higher the r value the greater the insulation performance. There are no r value requirements for ductwork installed in an indirectly conditioned space.

Purchasing the ducting and the insulation separately is often more cost effective and has a greater variety of options when it comes time to choose the r value of your insulation. However this is a cost that pays for itself quickly so choose higher r values when given an option. Existing 3 4 inches of insulation. If it was you don t have much recourse.

If we put ducts in unconditioned space they have to be insulated to either r 8 if they re in an unconditioned attic or r 6 in any other type of unconditioned space. When determining how much insulation you need don t guesstimate calculate. Our r value cognitive dissonance. R 6 duct insulation 6 305 btu hour 0 53 ton r 4 2 duct insulation 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.

Well your attic has a dramatic impact on the temperature throughout the rest of your home as well. Know exactly how much you need with our project calculators. For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.