10

Thin plate screws "Specialty screws with painted heads (with packing)" [No pre-drilling required!]
平田ネジ
Thin steel plate + thin steel plate + base wood ⇒ One-shot penetration without pilot holes!! Also prevents floating phenomenon!
10

External insulation sheet waterproofing method "Sadoshima Z Roof Hybrid Waterproofing Method"
佐渡島 本社/第1営業本部・大阪第1営業部
The hybrid waterproofing method, which excels in airtightness and weather resistance, protects buildings for a long time.
34

Suppresses roof condensation. Ventilated, moisture-permeable waterproof underlayment "Air Gap Sheet."
マルゲンマテリアル 本社
One layer of ventilation space and waterproof sheet. From now on, roofing materials will not rust. The underlayment will not decay.