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Old 09-08-2010, 10:05 AM   #1
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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.


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Old 09-08-2010, 10:44 AM   #2
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Those areas will fail prematurely.Seen it many times.


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Old 09-08-2010, 07:20 PM   #3
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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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