ᐅ 150 kg/m² live load for garage roof with option to convert into a roof terrace?
Created on: 12 Sep 2017 18:22
J
Judyyy
Hello,
From the beginning, we informed the architect that we wanted to keep the option open to use the solid garage roof as a rooftop terrace.
Now that the house construction is about to start, he told me that the garage was only designed for 150 kg/m² (31 lbs/ft²), while a proper rooftop terrace should be designed for 400 kg/m² (82 lbs/ft²). He also mentioned that he has no concerns about the 150 kg/m² (31 lbs/ft²) load, since the intermediate floor in the house is designed for the same load, and the total roof load capacity should be considered...
70 m² (750 ft²) x 150 kg/m² (31 lbs/ft²) = 10,500 kg (23,150 lbs) = 10.5 tons
Of course, that sounds like a lot at first. That would be about the weight of 8 cars. Still, I have some concerns.
I would be interested to hear your opinions.
Best regards,
Judyyy
From the beginning, we informed the architect that we wanted to keep the option open to use the solid garage roof as a rooftop terrace.
Now that the house construction is about to start, he told me that the garage was only designed for 150 kg/m² (31 lbs/ft²), while a proper rooftop terrace should be designed for 400 kg/m² (82 lbs/ft²). He also mentioned that he has no concerns about the 150 kg/m² (31 lbs/ft²) load, since the intermediate floor in the house is designed for the same load, and the total roof load capacity should be considered...
70 m² (750 ft²) x 150 kg/m² (31 lbs/ft²) = 10,500 kg (23,150 lbs) = 10.5 tons
Of course, that sounds like a lot at first. That would be about the weight of 8 cars. Still, I have some concerns.
I would be interested to hear your opinions.
Best regards,
Judyyy
T
toxicmolotof12 Sep 2017 19:56Which intermediate floor in a house can support 150 kg/m² (31 lbs/ft²)?
I wouldn’t place a bookshelf on that.
And regarding the roof terrace… is it going to have a floor covering? After that, I don’t want to walk on it anymore, except for inspection purposes.
I wouldn’t place a bookshelf on that.
And regarding the roof terrace… is it going to have a floor covering? After that, I don’t want to walk on it anymore, except for inspection purposes.
I don’t know the exact values for a roof terrace, but for extensive green roofs (meaning without a thick layer of soil, just substrate), the minimum weight usually starts at 250 kg/m² (51 lb/ft²). The thin soil layer, plants, retained rainwater, and snow load all contribute to this. A typical standard prefabricated garage usually starts at around 125 kg/m² (26 lb/ft²). To me, it seems completely unrealistic (from a non-expert perspective) that 150 kg/m² (31 lb/ft²) would be sufficient for a roof terrace.
T
toxicmolotof12 Sep 2017 21:42I'm not a structural engineer, but I believe a simple 4cm (1.5 inch) thick 30x30cm (12x12 inch) concrete patio slab weighs around 11kg (24 lbs). For one square meter, you need about 11 of these. That adds up to 121kg (267 lbs) without any base structure or a person standing on it.
For 70 square meters, that's already 8.4 tons (9.3 US tons) just for the slabs. So, there’s no way to fit two cars on that surface. Not even one, once you add the base, railing, furniture, grill, plants, and so on. Maybe a bicycle— but only if you want to scrap it.
I wouldn’t even put my big toe on it.
For 70 square meters, that's already 8.4 tons (9.3 US tons) just for the slabs. So, there’s no way to fit two cars on that surface. Not even one, once you add the base, railing, furniture, grill, plants, and so on. Maybe a bicycle— but only if you want to scrap it.
I wouldn’t even put my big toe on it.
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