As opposed to referring to a certain material, temporary secondary glazing is any simple, light-weight screen which can be attached and removed when demanded. Jerry CoffinJerry Coffin 493k8383 gold badges652652 silver badges1.1k1.1k bronze badges 7 12 Notice that g++ rejects %lf when compiling with -Wall -Werror -pedantic: mistake: ISO C++ https://sustainable-living40516.theobloggers.com/43333162/fire-rated-secondary-glazing-for-dummies