Here s how that 3 500 sf house would come out with those.
R value for flex duct in attic.
R value of insulated ducts flexible ductwork running in open space like an attic will be insulated from about r6 to r10.
I m looking at you mississippi and alabama r 6 and r 4 2 are common r values for ducts.
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.
Blanket duct wrap is applied separately from the actual ducting process whereas insulated flexible duct comes with the insulation already wrapped.
The higher the r value the greater the insulation performance.
Know exactly how much you need with our project calculators.
When determining how much insulation you need don t guesstimate calculate.
Some other factors to consider.
6 305 btu hour 0 53 ton r 4 2 duct insulation.
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.
Like the title says and this is a 3rd floor apartment.
7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.
Number of duct runs house size is a factor here but so is the layout of your home.
How often do you think you get the full labeled r value.
Both types of insulation are available in a variety of thicknesses and r ratings.
The attic ductwork is flex duct work.
R value measures how well certain building insulation materials can resist heat.
Or you live in a state that doesn t require r 8 on ducts in attics.
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.
There are no r value requirements for ductwork installed in an indirectly conditioned space.
I called out the original hvac company and they took a look and said they saw no water.
What can i do to prevent this.
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.
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.
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.
For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.
A sprawling ranch might have more duct runs than a two story of the same number of square feet.
The duct insulation r values i mentioned above are what s on the product label.
