Answer by  
                                                                                          sammyrags (82)
                                                            
                          
                          
                                                           Starting at the lower edge of the roof roll the underlayment hoizontally across the roof. Use a stapler to secure the underlayment. Continue this process until you reach the ridge of the roof. Many townships will require that the first course of underlayment actually be a weather shield membrane which is still installed in the same manner.