
15,0
{
* Asphalt shingle+concrete plank roof *

(asphalt shingle | 2.4 pieces ,
 roofing felt 30 | 0.367 ft ,
 rigid insulation 2" | 1 sq ft ,
 precast concrete plank | 1 sq ft ,
 2x2 furring 16" o.c. | 0.75 ft
 regular gypsum wallboard 3/8" | 1 sq ft )
}
5,0
{
* Tile+wood joist and rafters *
-joists 16" o.c.
(9x15 tile | 1.28 pieces ,
 roofing felt 30 | 0.367 ft ,
 plywood type I. 3/4" CDX | 1 sq ft ,
 batt insulation R 30 | 2 sq ft ,
 2x10 wood joists | 0.75 ft ,
 regular gypsum wallboard 1/2" | 1 sq ft )
}
