They just tear through them smash them climb on.
Flex ductwork in attic.
It was new when the ac was put in 7 years ago.
The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports.
The right choice in ductwork for you likely depends on the specifics of the attic above your in law suite.
Flexible duct is a plastic tube that is reinforced with wire and then insulated on the outside.
The attic ductwork is flex duct work.
The attic is a hot dirty nasty place.
The next most typical type of duct systems is made of flexible duct.
Secure the webbing to the joist by hammering a 2 inch roofing nail through the webbing and into the side of the joist.
The straps that hold up the flex duct need to be no less than 1 5 wide.
Flex ducts themselves do not sweat however if the connection points are not sealed correctly and duct leakage is occurring then you can get sweating at those points.
This type of duct means a smoother interior with better air flow insulation applied on the outside to cut down on fibers getting into the system and a durable shell not easily punctured by rodents or uv light.
People can not carry ladders up into a attic and them place them onto 1 1 2 wide boards so they can climb over ducts.
Blown in insulation is cheap.
Here are some advantages for each.
They both have advantages and disadvantages.
Hold the loose end of a roll of duct support webbing against the side of a roof joist sitting directly above the flex.
The higher in the attic the hotter it is.
Just blow the attic to r 38 and over the top of ducts if needed.
The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum.
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.
Flex ducts on the other hand are smaller and tube shaped like giant shiny worms.
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.
How to hang flex duct in an attic 1.
The lower the cooler it is.