Sep 07, 2012 7:19 am
I just got a new gable pergola installed last week. The installer has put a box gutter on two sides. We've had quite heavy rain periods (including hail) since. I checked whether there were any leaks and found water droplets on the bottom of the fascia the entire length of the box gutters they've installed. The pergola company is wrapping up their business due to "personal issues" and my recent dealings with them regarding another issue has led me to think they just want this job over and done with so they'll do what's easiest for them, not necessarily what's best for my home. I really don't want any further issues with this once they're gone. Just looking for some advice on what could be wrong? What questions do I need to ask them? What should I make sure they do to recify the problem?
Box gutters located here...
These photos are from me standing at the double sliding doors going left to right. You can see the beads of water on the bottom of the fascia...
My Build Thread: https://forum.homeone.com.au/viewtopic.php?f=31&t=43997
Re: New pergola - droplets on fascia - what could be wrong?2
Sep 07, 2012 12:37 pm
I built my own verandah recently and experienced the same issue. I found the fault to be the sheeting being too much into the guttering and hitting the fascia rather than the gutter itself. This then causes the water to drip down between the gutter and fascia to what you see as droplets. So you have two options, place a flashing down underneath the tiles cover the fascia which makes the water bounce off the flashing into the gutter. The other, of which I did to fix the situation, cut down to a reasonable distance the overlapped sheeting with an angle grinder using a 1mm thick disc to ensure the water flows nicely into the gutter.
Before doing this, get onto the roof and check how far the sheeting goes into the gutter, take a picture and post for further comment.
Re: New pergola - droplets on fascia - what could be wrong?3
Sep 07, 2012 7:18 pm
Agree with the above post. Sheet roofing is defective if it overhangs the gutter's inside face by less than 50 mm or by more than 65 mm.
Also, box gutters have to be designed for a 1:100 Average Recurrence Interval. I would be getting someone to check your roof harvest area and see if the gutter size and downpipes comply with the codes.
EDIT: The above comment about box gutter compliance is not a suggestion that this could be the cause of the posted problem. The problem however is symptomatic of faulty workmanship. As such, other common non compliant issues with box gutters should also be assessed.
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