Patent ID: 9453338
Filing Date: 2016-09-27
CPC Classification: E04B,E04F

Claim Text:
1. In a balcony comprising parallel transverse boards ( 46 ) forming a floor of said balcony supported by longitudinal parallel joists ( 30 , 30 ′) and by transverse joists ( 34 , 54 ), said balcony having a very first transverse joist ( 34 ) located upstream and laid against a wall of a construction; the introduction of a watertight underdeck membrane ( 20 ) fixed above two of said parallel joists allowing to collect water passing between said boards and discharging downstream, said membrane comprising: a cover zone ( said foldable gutter zone comprising a z-fold ( said flat zone ( once in opened position, said membrane being larger than a distance between said two parallel joists, thus allowing to deepen said gutter zone thus creating a gutter depression without warping said membrane at its junctions with said two joists.