Weather-tight

[…] There’s a rubble-stone Unfit for the front o’ the building, stuff to stow In a gap behind and keep us weather-tight; There’s porphyry for the prominent place. Good lack!

Source: wiktionary

Some experts claim that it is a bad practice in stone buildings to build the window-frames in with the stone masonry of the wall, and that the openings should be carefully made, the stone wall being brought to a proper face, thoroughly pointed, and the window-frames put in afterward, if a weather-tight job is desired.

Source: wiktionary

The house was weather-tight and warm, big fires blazed in every room.

Source: wiktionary