1 Breakages are less as the boards are much tougher and have fibers reinforcing in them. 2  they damage less easy from general wear and tear in everyday use in a home or office. 3  It offers slightly better acoustics than standard board.  It is a superior product in case of fire.
It is normal for the solenoid to make noise, it clicks when the valve is turned on or off. It also is normal for a very soft buzzing sound to be heard when the valve is activated, but you should not be able to hear it unless you put your ear near it. If you can easily hear it buzzing, that is not normal.
Published: August 18, 1985. WATER pipes that bang, hammer or squeal are not only a nuisance, they may also be an indication of plumbing problems. One of the most common noises is a whistling that occurs when a water valve or faucet is turned on, or when a toilet tank is refilling after flushing. Whistling sounds develop whenever water flows rapidly past or through a narrow restriction or an obstruction.