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Hossenfeffer 09-08-2010 10:05 AM

Not having downpipe across roof bad for roof?
Like several houses in the neighbourhood ours has gutters from the dormers running backwards and then a downpipe just to the roof so as to let the water drain down and across the roof to the gutters at the lower edge.

The home inspector said a downpipe should be added to run down across this span so that the water runs through it and not over the shingles.

Right now the problem seems to be a discolouration extra fungus-type buildup on the water track.

Can this perpetural stream across the duroid-type shingles be damaging or shorten their life, or is it just more unsightly? I've heard it is just an aesthetic issue.

House is on the wet west coast.

johnk 09-08-2010 10:44 AM

Those areas will fail prematurely.Seen it many times.

Tom Struble 09-08-2010 07:20 PM

i never just drop onto another roof,i will offset the leader down the side wall if i have too,or i will run a leader directly into the lower gutter

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