The variation includes: a jotoshiki held at an alter placed on the roof; an alter is placed on the roof but the ceremony is held on the ground; and both alter and ceremony are on the ground.
屋上に祭壇を設けそこで祭祀を行うものや、祭壇のみ屋上に設けて祭祀は地上で行うもの、祭壇も祭祀も地上のものの区別もある。