15 square meters of double light steel keel gypsum board, probably with the number of self-tapping nail?
3.5 meters high, 4.2 meters long.
Answer:
Each vertical interval of 25 cm each horizontal interval of 40 cm each. With 3.5 / .2 5 get 14. with 4.2 / .4 was 10.5,14 * 11 = 154 so side with 154 nails, both sides is 308.
