R Value For Attic Ductwork

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.

R value for attic ductwork.

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 6 and r 4 2 are common r values for ducts. However this is a cost that pays for itself quickly so choose higher r values when given an option. The attic ductwork is flex duct work.

Why attic insulation r value matters for california homeowners at this point you may be wondering why this r value matters so much especially when it s for an attic that you probably go into once a year to fetch your christmas decorations. R value measures how well certain building insulation materials can resist heat. Our r value cognitive dissonance. Existing 3 4 inches of insulation.

What i m talking about is a house with ducts in unconditioned space especially an unconditioned attic. For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness. When determining how much insulation you need don t guesstimate calculate. Recommended insulation levels for retrofitting existing wood framed buildings.

The higher the r value the greater the insulation performance. The higher the r value the pricier the ducting. If the contractor added all new ductboard and your local code requires r 6 then you have some ground to stand on. It was new when the ac was put in 7 years ago.

Add insulation to attic. I m in georgia iecc climate zone 3 where our current state code requires r 13 in exterior walls r 18 in attic kneewalls r 19 in floors and r 30 in ceilings. 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. Know exactly how much you need with our project calculators.

I called out the original hvac company and they took a look and said they saw no water. Was your ductboard existing and you added a zoning system. 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. Here s how that 3 500 sf house would come out with those.

If it was you don t have much recourse. There are no r value requirements for ductwork installed in an indirectly conditioned space. 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.