For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.
R value for flex duct in 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.
The higher the r value the greater the insulation performance.
Table 1 shows effective r values for 8 inch round ducts at three attic insulation levels and three duct insulation levels r 4 2 r 6 and r 8.
I called out the original hvac company and they took a look and said they saw no water.
Like the title says and this is a 3rd floor apartment.
The duct insulation r values i mentioned above are what s on the product label.
Here s how that 3 500 sf house would come out with those.
R value of insulated ducts flexible ductwork running in open space like an attic will be insulated from about r6 to r10.
6 305 btu hour 0 53 ton r 4 2 duct insulation.
Both types of insulation are available in a variety of thicknesses and r ratings.
It was new when the ac was put in 7 years ago.
What can i do to prevent this.
Or you live in a state that doesn t require r 8 on ducts in attics.
For contractors looking for r 12 duct warp microlite fsk formaldehyde free duct wrap is the only duct wrap on the market with an installed r value of r 12 in a single layer.
Blanket duct wrap is applied separately from the actual ducting process whereas insulated flexible duct comes with the insulation already wrapped.
The effective r value of a buried duct installation depends on the size of the ducts the r value of the duct insulation and the depth of the loose fill insulation.
7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.
A sprawling ranch might have more duct runs than a two story of the same number of square feet.
The attic ductwork is flex duct work.
Some other factors to consider.
I cannot condition the attic so the only things i can think of is to add insulation to the flex duct or i read somthing about increasing the fan speed to make the air flowing a little warmer.
There are no r value requirements for ductwork installed in an indirectly conditioned space.
R value measures how well certain building insulation materials can resist heat.
R 6 duct insulation 6 305 btu hour 0 53 ton r 4 2 duct insulation 7 948 btu hour 0 66 ton.
Microlite fsk duct wrap comes with an fsk foil scrim kraft facing designed to help ensure a closed system that prevents moisture drive and offers condensation control.
Know exactly how much you need with our project calculators.
When determining how much insulation you need don t guesstimate calculate.
How often do you think you get the full labeled r value.
