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.
Pregnancy symptoms: Top 11 early signs of pregnancy. Could you be pregnant? Some early pregnancy symptoms may show up around the time you've missed a period â or a week or two later. About 60 percent of women have early pregnancy symptoms by the time they're 6 weeks along, and roughly 90 percent have them by the time they're 8 weeks. If you're not keeping track of your menstrual cycle or if it varies widely from one month to the next, you may not be sure when to expect your period.