West Coast Ac Duct In Attic Insulation

The rigid insulation was saturated from condensation.

West coast ac duct in attic insulation.

But in my last article i also showed you some preliminary results from a research study on buried ducts in a hot humid climate. She asked me to go into the attic to find the roof leaks or where the snow is blowing in through the soffits. The ducts had the standard r 8 insulation you find on attic ducts but then were buried in r 30 ceiling insulation. The old blown in insulation had compressed and no longer did the job.

If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. If you want to cover metal ductwork. 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. They found r 8 duct insulation was sufficient to prevent.

Now if you pull off the old 4 2 insulation and seal all joints and seams in the metal ductowrk underneath with duct approved mastic then reinsulate the ductwork with r 8 0 foil backed duct wrap you will see the greatest improvement your ductwork system is capable of. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Consider adding more insulation as ductwork is farther from the furnace. Batt blanket or rolled insulation.

What is the minimum level of duct insulation to prevent condensation at the outer jacket of buried ducts in hot humid and mixed humid climates. I found instead a vintage 3 ton ac unit with 1 rigid insulation taped all over it and insulated flex duct snaking all over the poorly insulated attic. The cost and effort to add more insulation is minimal. Batt insulation consists of long rolls of insulation fibers which are held together with a paper or reflective foil backing.

For diy attic insulation you ve got two choices. It should significantly reduce the heat transfer from the ductwork to the. So they set up this model home with a buried duct system and installed a lot of sensors. The insulation fibers may be comprised of fiberglass cellulose mineral wool or even recycled blue jeans.

Loose fill or batt the common term for blanket insulation. 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. If your rigid metal ductwork has any insulation it may already have enough. The estimator omar came out and was knowledgeable and friendly.

Yes when you bury ducts in attic insulation in a humid climate you increase the risk of water vapor condensation on the jacket of the duct insulation.