Don't do installs anymore but back in the day yes and no. Should you? Yes. It's a very cut throat market in residential. 9 times out of 10 the low bid gets the work and I promise you his bid will not include duct sealing.
I read the article. There are things about his description of radiant barriers that defy physics. And maybe, due to his choice of words, it's semantics.
If a fluid or solid of any sort exists in any state it will seek equilibrium, either positive or negative, Doesn't matter if the energy mechanism is conductance, radiance, convection or any other thing in the Milky Way. The mathematics are pretty straightforward and do not lie. The conservation of energy and mass are irrefutable.
The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....
Around here we are still getting used to increased RNC energy codes that include duct sealing. You're only allowed so much duct leakage and it includes what is lost at the boot going into the conditioned space.
The three most prevalent methods I've heard around hear are Mastic, the Hardcast tape w/ blue writing and black rubber backing, and siliconing every joint. Everyone has their own preference, but it seems the tape is the most popular in my county.
Ok thanks for the responses. I personally prefer to duct seal it with paint on mastik because its the cheapest, but sometimes i use the foil tape, i would never use mastik tape its like $40 a roll. My boss insists we do it though i was just curious because i had the theory that its not a leak spot unless you undersize your ductwork. The way i see it is that the air wants to take the path of least resistance which is down the duct to the supply or return, why would it want to fight its way through a tiny crack if the duct isnt undersized.