The STC is a single number rating scale that measures a wall, ceiling, or floor assembly's ability to block sound transmission. The higher the number, the greater the drop in decibel levels bleeding through the surface.he STC is a single number rating scale that measures a wall, ceiling, or floor assembly's ability to block sound transmission. The higher the number, the greater the drop in decibel levels bleeding through the surface.
There isn't a set time when mums-to-be start to show a pregnant belly. Every woman is different. If you're a first-time mum, you could begin developing a baby bump any time between 12 and 16 weeks. But if this isn't your first baby, you may start showing sooner.This is because the muscles in your uterus (womb) and belly may already have been stretched from your last pregnancy.our age can influence when you start to look pregnant. Older mums often start showing earlier than young mums. This is because younger women are more likely to have stronger stomach muscles, which can disguise their bumps.
Conception and early pregnancy symptoms. Most conception and pregnancy research shows babies are conceived around two weeks before your next period would have been due â which is the same as saying conception begins two weeks after the start of your last normal period.