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.
placenta-the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus. embryonic membrane, caul, veil-the inner membrane of embryos in higher vertebrates (especially when covering the head at birth).