We have a shallow 23-degree pitched roof with drainage via an eaves flashing. This means the underlay drains over the eaves flashing and everything flows over the roof tiles into the gutter. It is a cold roof.
1. How problematic is this if a photovoltaic system is installed later? Water that gets onto the underlay through the connections or roof tiles.
2. How problematic is this for the façade, since the water drips off uncontrollably? Condensation and moisture buildup, as well as snow loads in winter that pass through the roof tiles and get blown onto the façade by the wind. (2 full floors)
3. Are there any negative experiences regarding a terrace—meaning water frequently running off the eaves flashing onto the façade?
4. Should drainage generally go into the gutter starting from a certain roof size, since more water naturally accumulates?
5. Am I worrying too much?
The roof tile used has a standard roof pitch of 22 degrees.
Does the eaves flashing need to be explicitly listed in the construction and scope of work description? The general contractor just did it this way, and I would have preferred to be consulted beforehand.
1. How problematic is this if a photovoltaic system is installed later? Water that gets onto the underlay through the connections or roof tiles.
2. How problematic is this for the façade, since the water drips off uncontrollably? Condensation and moisture buildup, as well as snow loads in winter that pass through the roof tiles and get blown onto the façade by the wind. (2 full floors)
3. Are there any negative experiences regarding a terrace—meaning water frequently running off the eaves flashing onto the façade?
4. Should drainage generally go into the gutter starting from a certain roof size, since more water naturally accumulates?
5. Am I worrying too much?
The roof tile used has a standard roof pitch of 22 degrees.
Does the eaves flashing need to be explicitly listed in the construction and scope of work description? The general contractor just did it this way, and I would have preferred to be consulted beforehand.
In der Ruine27 Feb 2024 06:32Oberhäslich schrieb:
The drip edge runs into the gutter, just like in my first photo. You can see it clearly under the tile there.That is the gutter hook flashing. Does your underlayment run over the gutter hook and drain directly into the gutter, or does the membrane connect underneath the gutter and drain over a drip edge? There are generally two different methods.S
Spiderman198227 Feb 2024 07:41Oberhäslich schrieb:
Why uncontrolled? The drip edge sheet metal leads into the gutter, just like in my first photo. You can clearly see it under the roof tile there. The drip edge sheet metal does not lead into the gutter. Only the gutter apron sheet metal drains into the gutter. There are two options for drainage; when large amounts of water are expected, it is essential to drain into the gutter (building permit / planning permission). With the drip edge sheet metal, there is always a risk that water will pass through the tiles onto the underlay and then flow uncontrolled downward over the drip edge sheet metal.
Drainage from the roof tiles always flows into the gutter.
O
Oberhäslich27 Feb 2024 08:59Okay, that doesn’t tell me much. I only know it with a drip edge, and that’s also how it’s described in the literature for a gable roof. The roofing underlayment is installed over the drip edge so that precipitation flows into the gutter. I can’t see where an additional metal flashing would go. In my case, it’s like this here and in line with current standards.
If your situation is different, a photo would help. I can’t really imagine it otherwise.
If your situation is different, a photo would help. I can’t really imagine it otherwise.
In der Ruine27 Feb 2024 09:35No image, but text.
Option 2: Drainage below the rain gutter
In many cases, option two is an alternative. The drainage for the rainproofing additional measure is done here below the rain gutter by a drip edge attached at the rafter end. This is then followed by the counter battens and the fascia board for mounting the rain gutter. The underlay membrane therefore does not drain into the rain gutter; instead, the diverted rainwater drips off below onto the drip edge. Since the underlay membrane in this construction is laid flat up to the rafter end, water pooling is prevented. Snow also cannot block the water flow, as it accumulates “one level higher” in the rain gutter. Snow that is blown into the counter batten area can also drain off via the drip edge, unless restricted by an insect screen.
Option 2: Drainage below the rain gutter
In many cases, option two is an alternative. The drainage for the rainproofing additional measure is done here below the rain gutter by a drip edge attached at the rafter end. This is then followed by the counter battens and the fascia board for mounting the rain gutter. The underlay membrane therefore does not drain into the rain gutter; instead, the diverted rainwater drips off below onto the drip edge. Since the underlay membrane in this construction is laid flat up to the rafter end, water pooling is prevented. Snow also cannot block the water flow, as it accumulates “one level higher” in the rain gutter. Snow that is blown into the counter batten area can also drain off via the drip edge, unless restricted by an insect screen.
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