Drywall & Acoustic Ceilings: SIA 181 Noise Control, VKF Fire Ratings, and NPK 671
Practical guide for Swiss drywall contractors and acoustic installers: sound insulation per SIA 181, VKF fire-rated ceilings EI 30 to EI 90, suspended ceilings under DIN 18181, NPK 671, and BKP 281.