Cold climate hat.
I have asked Martin to post a wall/roof detail that is intended to separate the thermal and air control layers of the roof from the weather shedding layers. I see several possible advantages:
1. As the insulation is encapsulated on six sides, I wonder if this will yield better thermal performance by reducing convection?
2. As the roof deck is separated from the thermal control layer, unwanted solar heat gain in summer is reduced.
3. Adaptable. The depth of the drop-ceiling can be varied for more or less insulation.
4. Ease of construction. Framing proceeds almost as normal platform construction but the upper floor walls are framed 2′ or so higher than the desired ceiling height. Trusses are installed and roofing proceeds. Exterior wall trusses, drop ceiling and insulation are then installed under the cover of the roof.
I’m wondering what people’s general impressions are?
Also wondering about the best method for blowing loose-fill cellulose into the drop-ceiling? Installation should be through board sheathing under the ceiling so as not to disrupt the TYPAR membrane under the trusses.
Options I’ve come up with so far:
1. Leaving openings in the board sheathing (barely large enough) for a person to fit their torso through, then closing up the openings as you go.
2. Sheathing the ceiling and blowing cellulose as you go. Finishing by blowing through holes in the sheathing.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part