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.
The knocking noise is the piston rods hitting on the main rod bearings because there is no lubrication. Because of the lack of oil and probably the excessive frictional heat, the rod bearings and the rocker arms have worn to the point that they are loose and will continue to knock and tick.he knocking noise is the piston rods hitting on the main rod bearings because there is no lubrication. Because of the lack of oil and probably the excessive frictional heat, the rod bearings and the rocker arms have worn to the point that they are loose and will continue to knock and tick.