Hello,
We have a garage roof that slopes very slightly from the front/garage door towards the back, where it meets the pergola.
So far, rainwater from the garage roof has flowed over the glass-covered pergola into a drainpipe.
Now the pergola is going to be redesigned. Therefore, it is necessary for the rainwater from the garage roof, which is made entirely of concrete, to no longer flow to the back over the pergola, but instead to drain to the front via a modified slope into a rainwater pipe that still needs to be installed.
Is it possible to create such a solution, where the downward slope on the roof is raised at the front by adding a layer of concrete, thereby creating an overall slope towards the front?
Is applying a new concrete layer over an existing concrete surface even feasible?
What costs would we be looking at for this option, given a length of 15 m (49 feet) and a width of 5 m (16 feet)?
Thank you very much for your response!
We have a garage roof that slopes very slightly from the front/garage door towards the back, where it meets the pergola.
So far, rainwater from the garage roof has flowed over the glass-covered pergola into a drainpipe.
Now the pergola is going to be redesigned. Therefore, it is necessary for the rainwater from the garage roof, which is made entirely of concrete, to no longer flow to the back over the pergola, but instead to drain to the front via a modified slope into a rainwater pipe that still needs to be installed.
Is it possible to create such a solution, where the downward slope on the roof is raised at the front by adding a layer of concrete, thereby creating an overall slope towards the front?
Is applying a new concrete layer over an existing concrete surface even feasible?
What costs would we be looking at for this option, given a length of 15 m (49 feet) and a width of 5 m (16 feet)?
Thank you very much for your response!
You want to pour so much concrete in a wedge shape onto a 15m (49 feet) long concrete roof that its lower end becomes higher than the upper end just by that? – but this attempt at causing a collapse is not supposed to be the definitive solution, right?
That already sounds a lot like "Technical University of Schilda."
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
That already sounds a lot like "Technical University of Schilda."
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Well, maybe before giving that answer, it would have been better to first ask about the slope at all. Then our idea might not necessarily have been considered a "fool’s wisdom."
The garage roof has a very slight slope; it’s basically a "flat roof," and it would be more of a "leveling screed." It’s hard to imagine that there would be any collapse risk here. If the flat roof were "filled up" from the pergola side so that it is the same height as the front (towards the garage door)... and then collapse???
And the "screed" would only need to be smoothed off a few centimeters from back to front to create a slight slope again.
After all, we don’t want a new garage roof, just some modification of the existing one! Every tradesperson probably has a different approach to this—and of course, the costs can vary accordingly.
Just as a small example: Dove spikes are to be installed on the roof. One craftsman needs an expensive scaffold for this... while another roofer just steps outside, sticks the spikes on, and that’s it... two ways to achieve the same result.
In other words, "you can make an elephant out of a mosquito"…
The garage roof has a very slight slope; it’s basically a "flat roof," and it would be more of a "leveling screed." It’s hard to imagine that there would be any collapse risk here. If the flat roof were "filled up" from the pergola side so that it is the same height as the front (towards the garage door)... and then collapse???
And the "screed" would only need to be smoothed off a few centimeters from back to front to create a slight slope again.
After all, we don’t want a new garage roof, just some modification of the existing one! Every tradesperson probably has a different approach to this—and of course, the costs can vary accordingly.
Just as a small example: Dove spikes are to be installed on the roof. One craftsman needs an expensive scaffold for this... while another roofer just steps outside, sticks the spikes on, and that’s it... two ways to achieve the same result.
In other words, "you can make an elephant out of a mosquito"…
Insulation is the key. Every roofer should be able to create a slope for this; the price for this size is around 3,000 to 4,000 euros.
Alternatively, use EPDM membrane and build a basin with it. Anything below the drain will simply evaporate. Price is around 1,800 to 3,000 euros.
Alternatively, use EPDM membrane and build a basin with it. Anything below the drain will simply evaporate. Price is around 1,800 to 3,000 euros.
Many options are possible.
If the structural engineering of your garage allows it, talk to a screed installer; they can create a screed with a three-dimensional slope.
Alternatively, first get opinions from a few roofers. Polystyrene panels with a slope can be installed and then sealed with a membrane or bitumen sheet.
If the structural engineering of your garage allows it, talk to a screed installer; they can create a screed with a three-dimensional slope.
Alternatively, first get opinions from a few roofers. Polystyrene panels with a slope can be installed and then sealed with a membrane or bitumen sheet.
Gustav schrieb:
Well, maybe before answering, one should have asked about the actual slope first; then our idea might not have seemed like a "Schilda wisdom". I have read that
Gustav schrieb:
over a length of 15 m (49 feet) [...] it slopes downward toward the pergola.I interpret this as a 15 m (49 feet) long section of a slope that is supposed to be turned into an incline. With a gradient under 2°, a slope for drainage is almost useless. Then the difference between the current low point and the new high point at the same edge is a substantial one meter and four centimeters (1 m 4 cm / 3 feet 5 inches). That adds up, especially if you want to do it in concrete.
At half a degree, it is still 26 centimeters (10 inches). That is also considerably heavy and not easy to manage.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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