Jumping off of the roof of a short house would not kill a zombie!
This film was idiotic from start to finish, but the ending takes the cake as one the most idiotic in the history of film.
No way would jumping off of the roof of a short house kill a zombie. But that is exactly what this film implies.
The only way that a jumping method would possibly work to kill a zombie would be if the zombie jumped off of a very high cliff and then died as a result of splattering into millions of pieces.