R value measures how well certain building insulation materials can resist heat.
R value for flex duct in attic.
Number of duct runs house size is a factor here but so is the layout of your home.
6 305 btu hour 0 53 ton r 4 2 duct insulation.
A sprawling ranch might have more duct runs than a two story of the same number of square feet.
Like the title says and this is a 3rd floor apartment.
The attic ductwork is flex duct work.
I m looking at you mississippi and alabama r 6 and r 4 2 are common r values for ducts.
R 6 duct insulation 6 305 btu hour 0 53 ton r 4 2 duct insulation 7 948 btu hour 0 66 ton.
Blanket duct wrap is applied separately from the actual ducting process whereas insulated flexible duct comes with the insulation already wrapped.
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.
When determining how much insulation you need don t guesstimate calculate.
There are no r value requirements for ductwork installed in an indirectly conditioned space.
What can i do to prevent this.
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.
7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.
Some other factors to consider.
How often do you think you get the full labeled r value.
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.
Here s how that 3 500 sf house would come out with those.
The duct insulation r values i mentioned above are what s on the product label.
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.
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.
R value of insulated ducts flexible ductwork running in open space like an attic will be insulated from about r6 to r10.
Both types of insulation are available in a variety of thicknesses and r ratings.
For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.
The higher the r value the greater the insulation performance.
I called out the original hvac company and they took a look and said they saw no water.
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.
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.
