1 10 5 25 per foot insulated flexible duct 4 to 16 diameters used as branches or in radial duct attic systems 2 30 13 00 per foot round and oval sheet metal duct 3 to 8 diameters typically used for trunks in small homes and.
Attic hvac ducts.
When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space.
The air ducts for a central hvac systems are typically located above a home in the attic or upper crawl space or underneath a home in the space between the foundation and the floor so.
The really bad news is that with old metal duct systems the only option is replacement of the ducts to stop the rain in the attic.
Don t use standard cloth duct tape on hvac ductwork since the adhesive won t hold up to extreme temperatures.
The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
For an added layer of protection you can apply duct mastic to the tape and duct.
First water dripping off of your ducts and onto your insulation can cause the insulation to compress which decreases it s r value or ability to insulate.
Use the type of.
Cost of installation supplies.
Flex ducts themselves do not sweat however if the.
Use metal flex or fiber board ducts that are insulated to.
The next most typical type of duct systems is made of flexible duct.
When water condenses and drips into your attic or home it can cause a some serious secondary problems.
The unconditioned space also houses his hvac system.
Why is condensation on ductwork a problem.
Here s why that is a good thing.
Here are the itemized costs for the most common types of ductwork and supplies needed to complete installation.
Sometimes air conditioned air will seep right through your ducts and become useless instead of heating and cooling your home.
Well mainly it s a way to save space.
Ted has more than a few cobwebs in his attic.
When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.
In the 70 s and 80 s in slab hvac ductwork was commonplace and took advantage of the relatively stable temperature of the slab at or near the ground.
Attic hvac systems save space.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
If you have central heating and or air conditioning in your home the warm or cool air is delivered to each room through a system of connected ducts and vents.
All ducts are at risk for this type of leakage.
There will be less duct leakage.
Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.
So why put an hvac system up in the attic at all.
Duct leakage causes a lot of problems including less.
Why is this a problem.
Attic hvac systems also require shorter ducts.
