a larger catchment area is one good point.mickojak wrote:I have requested an extra 50mm length on the inner vertical side to provide a much larger catchment area.
another important point is one that thais obviously do not know nor pay attention to:
the inner vertical side must be higher than the outer vertical side!
why? in case the gutter is full, the water must be able to escape on the outside instead of the inside. so where will the water escape? it will escape on the lower level.
if the water escapes on the inside, your roof will suffer, sooner or later.
the following 2 pics might help you to follow my argumentation:
in addition to this, please make sure you will have protection sheets fixed as well. they are very important to protect your roof from getting wet, specially at times with heavy rain. these special protection sheets are often missed in thailand, but very helpful to protect your investment. see next pics.
i wish you well with your house building project.
good luck.