Installing a Radiant Barrier in the Attic | Alternative Method to Insulate the Attic



hey I'm Larry janeski from dr. Energy Saver and I'm Mike rust from dr. Energy Saver in Cleveland Ohio you know there's a variety of different ways to treat an addict to make a home more energy efficient and comfortable year-round the conventional approaches are air sealing the attic floor and to blow in blown-in insulation typically cellulose we put baffles in we have to seal can light covers we have to seal the add a catch door we have to seal the ducts and insulate the ducts and seal the chimney chase and duct chases and electric and pipe holes and all these things we have to do to get the job done right but there's another strategy and that is to make the attic into conditioned space that's right we do want to try to turn the attic into conditioned space so what we want to try to do is we want to try to make the attic as warm as we can in the winter and as cool as we can in the summer so that we don't have those differences in air temperatures and we don't have that have to worry about that air leakage or that insulation at the lower level here okay so everybody knows that in the summer your attic is really hot I mean the attic could be 140 degrees in the summertime and in the winter since your attic is vented it's going to be very cold it could be 30 degrees could be less than that so the traditional approach says hey let's put the insulation to thermal boundary as we say of the house at the attic floor or what might be the ceiling of the your upper floor of your house so if it's a ranch it's your ceiling if it's a two-story house it's your second floor ceiling that would be where we'd put the insulation but that leaves the attic to be like outside space because we have vents to let outside air into it but this approach takes this thermal boundary we don't need this insulation anymore and it puts the thermal boundary at the bottom of the roof that's right so if you wanted to store something in the attic or if you had ductwork or HVAC equipment it's real important to protect that equipment against air leak it's an air leaks and insulation and and so forth and so this would be the way to do it just make the Attic as conditioned or as close to it as the rooms below and we can take that worry away all right so what's this called this is called silver glow and we actually call it super attic after we put the silver glow up and it's pretty simple actually it's a four-inch piece of foamboard insulation that we have fastened to the underside of the roof all the way down this would of course go all the way up to the top and then all the way down to these floor joists down here below and by putting those in what we've done is we've set the insulation boundary up here under on the underside of the roof and then each of these pieces are foamed and then taped and sealed so that we've also prevented any air from leaking through them to the opposite side and then out into the outside of the house I see and so we have our we have blocking here at the bottom which can be very difficult work in Internet expecially with a low pitch roof but our guys rise to that challenge and we have to get it completely airtight so that the roof is vented but the Attic is not see we still have our soffit vents down there and our Ridge vents up here so we have a vented roof but an unvented attic correct and that's very important because if the roof is invented and and and we don't allow the underside of this roof to stay cold in the winter and it should warm up somehow that'll give us those ice dams on the outside which we don't want so we want to maintain the airflow behind here maintain the ventilation that this house was supposed to have but at the same time create a conditioned space in this attic and that's what this does so we're gonna have a colder roof we're gonna have less ice damming we're going to have a cooler roof in the summer correct cause we still have a vented roof to vent excess heat that radiates from the bottom of the roof deck from the Sun that that excess heat can get out so basically you know the insulation isn't doing all the work and in the summertime we have some ventilation taking some heat away we also have one more important thing by the way if you'll notice this has a radiant barrier on both Suns so that heat that's that magnifying its way or heating through here in the summertime is being reflected back out to the outside again which again is going to help keep the attic cooler in the summer and then of course the barrier on the inside will help reflect the heat from the attic back into the Attic in the winter maintaining a warmer attic in the winter excellent so a radiant barrier on both sides again the insulation isn't doing all the work and yeah so and what will happen is your ducts if you have ducts in your attic they are not in a hostile environment anymore they're in a space that's pretty close to this same temperature as the heated and cooled rooms inside your house right which means that your the underside or the or your home underneath the attic is going to be more comfortable and energy-efficient as a result excellent so how does someone in the Greater Cleveland area find out more information all they have to do is either give us a call or go to our website and we'll be happy to come out and give them a free energy assessment and a written estimate great well thanks Mike you're welcome

22 Comments

  • Robert Appleby

    April 15, 2019

    Probably a good idea for NEW construction, but nearly impossible for older homes. You'd have to cut this stuff into tiny pieces to get it up there, then almost impossible to maneuver in tight attics to install properly

    Reply
  • CDaniel J80

    April 15, 2019

    If it looks expensive, my guess would be it's outrageously expensive to install.

    Reply
  • Guillermo Perez

    April 15, 2019

    Just install spray foam insation better than this

    Reply
  • Tessseract

    April 15, 2019

    Ducks in my attic? I've had squirrels, but never ducks.

    Reply
  • rep toob

    April 15, 2019

    Why does he need to wear a shoulder holster to insulate an attic?

    Reply
  • Aaron Simpson

    April 15, 2019

    Mullet man need to step aside

    Reply
  • Brian Peterson

    April 15, 2019

    Like the idea of boxing the rafters from soffit to ridge vent convection would probably be faster as the roof heats up

    Reply
  • Biguls

    April 15, 2019

    But surely without ceiling insulation between the roof joists the energy from your upper floor is simply flowing into the roof void and heating that space – what a massive waste of energy!

    Reply
  • Edward Padilla

    April 15, 2019

    Cut into strips and put between rafters.

    Reply
  • therealsparkman

    April 15, 2019

    Depending on building codes, you would not be able to remove the ceiling insulation to add this type of radiant barrier. Required in my climate, vapour barrier, insulation. No exceptions! Unless you had blown in foam insulation in the ceiling, of course. Those sheets of foam insulation at 4" thick are about R-20 (2" = R-10). A sheet of 2" 4' X 8' sheet Dow polystyrene foam board is around $40 dollars. Can't imagine what the cost of this product would be, but it wouldn't be cheap. The minimum R-value ceiling by code in my territory is R-50. Good idea, though, if you live in the southern states.

    Reply
  • Loosecannon Recordings

    April 15, 2019

    Hi how would this radiant insulation install work in Portugal Algarve . The Algarve is hot in summer with cold nights in winter. Humidity is average 65 -85 % I think ! With a tiled exterior roof air gap ( 25mm) insulation board air gap 25mm) then plasterboard for the inner finish . Q..
    1: would this be an effective install with at most 50mm radiant insulation -board .
    2: is there a concern of sweating in different conditions ?
    Thank you .

    Reply
  • Va Ne

    April 15, 2019

    Try to build houses instead of cannels. US house resembles cannel with outdated heating, cooling and plumbing systems

    Reply
  • bubbah671

    April 15, 2019

    Stupid . People can't even get a Porsche in the attic . This is bigger

    Reply
  • Jeffy Tood

    April 15, 2019

    I can smell the mold

    Reply
  • Jeffy Tood

    April 15, 2019

    I bet you that's cheap

    Reply
  • Charles Pietschman

    April 15, 2019

    Some here have said it. Would be difficult to find leaks in the roof because they are easier to spot from inside after 25 years of experience in the roofing trade I never go in a attic to find a leak because where the fault in the roof is might be far away from where it enters your attic. Missing or damaged shingles or in correct installation of any projection is most always the cause of the problem drilling 1 1inch hole near the top and bottom of each rafter will also assure that each rafter bay is vented adequately it looks like a good idea to me

    Reply
  • Trucker Daddy - AKA John in Québec

    April 15, 2019

    What about dry rot?

    Reply
  • Feedback4Utoday

    April 15, 2019

    Looks great. Do Wonder if the insulation would get overwhelmed after say 5!hrs of sun on the roof – & then be same temp as the roof? Does it still work?

    Reply
  • R L

    April 15, 2019

    No one calls attic insulation "Thermal Boundary", not homeowners or construction workers. I worked in construction all my life, and even worked for an insulation company many years ago. These guys are silly trying to sound smarter than everybody, using phrases like that.

    Reply
  • Danius Von Gailis

    April 15, 2019

    Just put together two 2" foam insulation sheets with reflective side . Doe that material has better R rating then regular 4 inch styrofoam?

    Reply
  • Robert Cunningham

    April 15, 2019

    Looks like the makings of a grow room.

    Reply
  • Mick

    April 15, 2019

    How well does this install in the roof of my trailer? My meth lab tends to keep it warm in winter but I need to keep the heat down in summer as a safety measure…. the fumes can be explosive.

    Reply

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