Scope of application

1. The upper limit of ⊿Qa is 13.72kN/m

2. The facing material is structural plywood T12, and the nails are N50 or CN50 nails.

3. The length of the nail should be at least 2.5 times the thickness of the face material, and the thickness of the face material should be at least 12 mm. Structural plywood is JAS class 2, surface veneer is J1 (red pine, larch, Douglas fir, black pine, etc.) or J2 (cypress, cypress). , Beituga, Beihi, etc.)

4. Nail pitch is 75mm or more, edge distance is 10mm or more and t×0.8 or more

5. Joists do not have joints.

6. Rafters shall be installed at intervals of 455 mm with a cross section of 45 x 60 or more.

7. The end of the rafter shall be completely sunk into the main building.