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Pros & Cons of Dome Construction
Pros:
1. Lightweight with proper design
2. Minimal materials for maximum strength with proper design
3. Simple support structure with proper design
4. Low cost with proper design and implementation
Cons:
1. No attic as with conventional construction to vent vapor and prevent condesation and buffer high roof temperatures.
2. Hard to roof
3. Not enough insulation.
4. Not enough thermal mass
Remedy to "Cons":
1. Use reflective roofing to reduce thermal impact
2. Use reflective insulation to reradiate any heat absorbtion create from the roof
3. Use a vapor-thermal insulating break between the framing and the sheathing
4. Use high tech, simple to use Peel & Seal Roofing
5. Use high tech insulation to produce an R-40 using a 2x4 framing
6. To increase thermal mass, simply go to a radiant floor heat system whereas the insulated slab becomes your thermal mass. In a 1000 s.f. dome this would equate to around 40,000 pounds with a 3 1/2" thickness. For more information on construction of radiant slab construction, go to URL: http://hometown.aol.com/roconroy/insulateh.html
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Reflectix insulation is stapled to panel, and is situated between the framing and the board insulation, which is directly under the sheathing. This both provides a reflective thermal break as well as a vapor barrer between the hot interior vapor and the exterior cold winter sheathing.
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This picture shows the panels being preroofed with Peel & Seal Roofing. This the minimizes need to climb the roof to install the roofing but does not meet the manufacturers installation specifications of overlapping the edges. I chose this method to be able to store the panels in the open before erecting the structure. This prevents moisture from entering between the sheathing and the underlying insulation.
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e-mail address: roconroy@aol.com
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posted 5/24/12 rlc
revised 7/13/02 rlc
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