This photo shows a combination of bubble and radiant board insulation being used internal to dome panels. The roof opening is for a roof ventilation turbine. The bubble solar shield has an equivalent of R-5.1 for ceilings and R-8.6 for walls. The 3/4" reflective board insulation has an R-value of 8.4 if used properly in conjuction with a 3/4" airspace. This gives a combination R-factor of 13.5 for a ceiling. With an external 1" board insulation of R-10 plus an additional inside 3/4" board insulation with R-8.4, a total of R-31.9 can be achieved. The 3/4" Super Tuff-R sheathing runs around $8.99/sheet, or about 33 cents per square foot. For fire protection, the foam sheathing requires a minimum of 1/2" of sheetrock.
Hardboard patterns plus a adjustable utility knife is used to cut both the board insulation and the bubble insulation. The bubble insulation is cut 1/4" wider than the patterns while the board insulation is cut exactly to size with a 5 degree bevel to make installation easier.
The sheetrock is accurately cut using patterns so as to make mudding the sheetrock an option. If one uses screws instead of nails, then the sheetrock simply has to be primed and painted. Caulking would all that would be necessary to close 1/8" the seams. A brace board and position guides are used to accurately place the sheetrock.
The sheathing cutting guide along with spacer boards are used to mark the sheetrock for cutting. Also the holes in the cutting guide are used to mark the sheetrock for where it is to be attached to the unseen underlying nailers.
