For example, if you install R-19 fiberglass batts in 2x6 frame walls, with the studs 16 inches on-center, double top-plates, and other elements of standard framing, the actual R-value of the whole wall with the R-19 insulation will be about R-15.
birthplace - the place where someone was born. place of birth. place, spot, topographic point - a point located with respect to surface features of some region; this is a nice place for a picnic; a bright spot on a planet. place of origin, provenance, provenience, cradle.
When a woman becomes pregnant, a flattened, disc-shaped structure called the placenta develops in the uterus. Made partly by the uterus and partly from fetal tissue, one side of the placenta connects to the umbilical cord while the other side attaches to the uterine wall. The placenta serves a critical role, supporting the growth and survival of the fetus throughout most of the 9 months of pregnancy.