While each alternatives increase insulation and sounds reduction, there are actually essential variances concerning secondary and double glazing: Jerry CoffinJerry Coffin 493k8383 gold badges652652 silver badges1.1k1.1k bronze badges seven 12 Note that g++ rejects %lf when compiling with -Wall -Werror -pedantic: mistake: ISO C++ won't guidance the ‘%lf’ gnu_printf structure https://ralphn776fvm4.wikitidings.com/user