ᐅ Aerated concrete solid roof designed as a pyramid roof on an urban villa
Created on: 21 Dec 2020 09:52
A
Amel_NRW
Hello everyone,
I have been following this forum for a while, and now we are finally starting our house construction. Currently, we are planning a townhouse (external walls made of 42.5cm (17 inches) aerated concrete, interior walls of sand-lime brick) with two full floors on a plot located in the second row, about 100m (328 feet) straight line from the pedestrian zone.
Townhouses are usually built with a 22-degree roof pitch and a hipped roof. Our idea for the roof is a 35-degree pyramid roof with a solid aerated concrete roof structure and 2 to 3 roof windows. Why this choice?
Firstly, we want to keep the option open to expand the attic in about a year to add an office and another child’s room, which is why we prefer a 35-degree pitch instead of 22 degrees. Secondly, due to the dense development around us, sound insulation is an important factor, and a photovoltaic system is firmly planned. According to a friend who is an architect, when the roof type can be freely chosen, a solid roof is preferable for both soundproofing and radiation protection reasons (especially regarding the photovoltaic system).
According to Ytong, any roof shape can be constructed as a solid roof. So far, in my research, I have mostly only found solid roofs as gable roofs. Does anyone here have experience with a solid pyramid roof and could possibly share photos? And does this approach make sense as we have imagined it?
If it matters, we are still undecided about the upper floor ceiling, whether to go with a wooden beam ceiling or a concrete ceiling.
Greetings from the Ruhr area
I have been following this forum for a while, and now we are finally starting our house construction. Currently, we are planning a townhouse (external walls made of 42.5cm (17 inches) aerated concrete, interior walls of sand-lime brick) with two full floors on a plot located in the second row, about 100m (328 feet) straight line from the pedestrian zone.
Townhouses are usually built with a 22-degree roof pitch and a hipped roof. Our idea for the roof is a 35-degree pyramid roof with a solid aerated concrete roof structure and 2 to 3 roof windows. Why this choice?
Firstly, we want to keep the option open to expand the attic in about a year to add an office and another child’s room, which is why we prefer a 35-degree pitch instead of 22 degrees. Secondly, due to the dense development around us, sound insulation is an important factor, and a photovoltaic system is firmly planned. According to a friend who is an architect, when the roof type can be freely chosen, a solid roof is preferable for both soundproofing and radiation protection reasons (especially regarding the photovoltaic system).
According to Ytong, any roof shape can be constructed as a solid roof. So far, in my research, I have mostly only found solid roofs as gable roofs. Does anyone here have experience with a solid pyramid roof and could possibly share photos? And does this approach make sense as we have imagined it?
If it matters, we are still undecided about the upper floor ceiling, whether to go with a wooden beam ceiling or a concrete ceiling.
Greetings from the Ruhr area
ypg schrieb:
Exactly. It then stands halfway into the room, creating a niche, but the effect or feel of an empty room is lost and it instead feels like "it can’t be done any other way."Okay, a wardrobe will indeed be difficult, you’re right about that. And I hadn’t considered the emergency exit issue — thanks for pointing that out.
The children’s room will now stay downstairs, and the office will be moved up to the attic.
There is enough space upstairs for two desks and a filing cabinet, and with two sufficiently large roof windows, there is natural light as well as an emergency exit route.
Since there haven’t been any strong arguments for a solid roof construction so far, we will stick with the standard roof frame.
11ant schrieb:
The appearance of a 10 x 10 m (33 x 33 ft) villa with a hip roof leaves much to be desired, and even with a 35° roof pitch, you need a clear idea of a knee wall to realistically consider usable attic space. Without a knee wall, I calculate 11.76 m² (127 sq ft) of floor area at a ceiling height of 2.30 m (7 ft 7 in); a gable roof would provide about 2.66 times as much. Where would the staircase even fit? Please show the entire design.May I ask how you calculate the 11.76 m² (127 sq ft) at a room height of 2.30 m (7 ft 7 in)?
Amel_NRW schrieb:
We visited a city villa model house with exactly the described specifications, meaning a 35-degree pyramid roof, and at my height of 1.84 meters (6 feet), I felt comfortable upstairs in the attic. But you are showing a Favorit Citylife 187 with 11 x 11 meters (36 x 36 feet) and a 30 cm (12 inch) knee wall. Converted, you would only be 1.37 meters (4 feet 6 inches) tall in this house (1.84 x 10/11 - 0.30), so you would need a 65 cm (26 inch) knee wall to achieve a comparable height. Unfortunately, having one meter (3 feet) less edge length also prevents you from positioning the staircase in the center of your house.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Amel_NRW schrieb:
And since there have been no real arguments so far in favor of a solid roof, we will stick with the standard roof frame.Since no concrete plans have been made yet, the possibility of a solid hipped roof could not be evaluated.Amel_NRW schrieb:
May I ask how you calculated these 11.76 sqm at a room height of 2.30 m (7.5 ft)?In my case, with a now vintage, standard school calculator. Given knee wall height 0 and roof pitch 35° = tan 0.7002075. After 3.285 m (10.8 ft) from the outer edge, 2.30 m (7.5 ft) height is reached — this applies symmetrically for the hipped roof. So, in the middle of 10.00 m (32.8 ft) length, there remain 3.43 m (11.3 ft) of edge length = 11.76 sqm (126.6 sq ft). A gable roof (= dual-pitched roof) would also offer 3.43 m (11.3 ft) width here compared to the hipped roof (= four-sided roof), but 10.00 m (32.8 ft) minus 2 × 0.425 m (1.4 ft) = 9.15 m (30.0 ft) length = 31.38 sqm (337.8 sq ft) (= factor 2.66). If that’s not an argument...If the necessary details are provided, I will gladly assess the accuracy of the building envelope and similar considerations.
11ant schrieb:
Unfortunately, one meter less edge length also torpedoes the possibility of placing the staircase already in the center of your house.... obviously, it must say "b[e]a[/e]utiful" instead of "already."https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
You’re showing a Favorit Citylife 187 with dimensions of 11 x 11 m and a knee wall height of 30 cm (12 inches). Converted, in this house you would only be about (1.84 x 10/11, -0.30) 1.37 m (4.5 ft) tall, so you’d need a 65 cm (26 inch) knee wall to get a comparable ceiling height. Unfortunately, the one meter (3.3 ft) shorter side length also prevents you from placing the staircase in the center of your house. That was exactly the house 🙂
We’re flexible with the knee wall since the development plan has no height restrictions. So we can easily build with an 80 cm (31 inch) knee wall and vary the roof pitch.
Today we visited a house with a hipped roof, and we like that even more than the tent roof.
With the staircase, we have to be careful where it leads upstairs, since that affects the whole floor layout.
11ant schrieb:
Since no concrete plans have been provided so far, the possibility of a solid hip roof couldn’t be evaluated.
In my case, using a now vintage, standard scientific calculator. Given a knee wall height of 0 and a roof pitch of 35° = tan 0.7002075. Then 2.30 m (7.5 feet) correspond to 3.285 m (10.8 feet) from the outer edge – for a hip roof this applies on all sides. This leaves a remaining edge length of 3.43 m (11.3 feet) in the middle of 10.00 m (32.8 feet) = 11.76 sq m (126.6 sq ft). A gable roof (i.e., a dual-pitched roof) would also offer 3.43 m (11.3 feet) in width here, but 10.00 m (32.8 feet) minus 2 x 0.425 m (1.4 feet) = 9.15 m (30.0 feet) in length = 31.38 sq m (337.8 sq ft) (= index 2.66). If that’s not an argument...
Provided the necessary details, I’m happy to get a clearer picture of the accuracy of the building envelope and similar factors.We don’t have any plans yet and are currently in discussions. We only have a self-designed floor plan that I intended to post here for discussion today. Thank you for explaining the calculation method, I learned something new 🙂
The 2.66 factor for the gable roof is definitely a strong argument, there’s no question about that, but at the moment we just can’t come to terms with the gable roof’s appearance.
Perhaps a hip roof with a knee wall height of 80 cm (31 inches) would be a good compromise for us.
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