If you've ever gone up in the attic of a hip roofed house in TV you'd be real skeptical about what kind of job they could possibly do. Pre-fab roof trusses of multiple configurations, flex duct snaking everywhere and penetrating the ceiling many times, inaccessible areas under the low parts of the roof...etc.
I've been up there to do some work and you can barely manipulate around never mind do some kind of a nice job installing foil. I'm a former HVAC installer and I'm real skeptical about what kind of job they can do not to mention the compacting of your insulation that must occur.
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