The template is designed to facilitate the fast and perfect placement of frames and seam-strips in doorsteads, securing them by means of polyurethane foam. The frames and seamstrips can be placed in new or old doorsteads, and the existing door can be used in the latter case. The use of polyurethane foam guarantees total durability, making the door extremely robust. It sets fast (in under 10 minutes), enabling rapid work and optimum use of the available time.