Hello again    
 
Possibly this topic would apply houses built in Japan.
I can watch many houses with the flat roof in Japan.
But that houses have bad drainage than the slope roof...I think...
 
Le Corbusier suggested a roof garden.So His houses need to have flat roofs,I think...
 
Now most of the flat roof houses don't have the roof garden.Then why most of architect design houses with the flat loof?It's just a symbol?
 
What do you think about it?I wait your opinion.
 
Thanks

Hello, this is an interesting topic, and another question could be why architects don't like slope roofs?
Flat roof is typical of modern architecture, it is almost similar to the column in classicial architecture in the language of modern architecture, flat roof is directly linked to the spirit of free plan. "make a plan and don't care about the roof !" so this is at first a new space concept.
Secondly this a question of aesthetics, with flat roof you consider the roof as an entire part of the volume, recent architectural projects include slope roofs with the same writing, the volume as a whole.
Functionnaly, Flat roof is great as a terrace roof like Le Corbusier roofs, it means, this a new ground above the building, that's why Le Corbusier used to compose flat roofs as small villages.
New argument, flat roof is a fifth façade, an horizontal façade with windows ( look at souto de moura roofs...)
etc....
Personnaly i think Roof is one of the most important architectural element, because aRchitecture was born with the idea of being under a roof...

Hello,AL.
Thank you for your opinion a lots.
 
In truth,I also love the flat roof.LOL But Most clients like the slope roof in Japan...They think the slope roof is a beautiful...
 
I think this question isn't a problem about a beautiful.And I also think  flat roof is linked to the spirit of free plan.The roof don't proof only against damage from rain.That need other functions now.
 
A roof of Yokohama international terminal changes into a floor ...and wall.
That isn't a difference between a roof and a floor and a wall...
That is quite new roof...  
 
I think the roof have many new possibility...

Roof

Yes, the roof have many possibilities. It's not only a protection...see traditionnal architecture in North Africa (Le Corbusier loved North Africa)
 
I don't know in english but in french, flat roof is "toit-terrasse", literally "terrace-roof".

Mamori, I think that you've answered to your question "Then why most of architect design houses with the flat loof?It's just a symbol?"..
because flat roof can have differents uses, differents fonctions..A slope roof only has "one"(the most important and different from the flat roof), it protect from the rain and help it to go down..
But I'm like you.. I wonder why only architects love this kind of roofs...Why people don't want to understand that they could earn a new "space" that they can use??As undertow said, the french name include the term of the space..

Thank you for your comments,undertow and mrowka  
I have read having interest in your opinions.  
 
Particularly,about the flat roof's name in France.In Japan,It was called "ROKU YANE".ROKU means the land,and YANE means the roof.So in Japan too,the flat roof means the space.But I think the word called "ROKU YANE "  was translated from German into Japanese.Because before the war,Japan was influenced by German culture.
 
In one area,If all houses have the flat roof,we can walk on that.And we can get new life style?

Why don't we considers roof as a diagonal part of the building, see the work of parent, i'm not expert in his architecture but the roof can be taken as an oblique part of the building to give a space with contrast (high and narow) and some energy to the building.
That could be a contemporary way to move away from the flat roof.

in contempory architecture the slope roof isn't only for the rain but also for skyline. I lived in a aera where the sky change a lot. colors of roof  change with it.

 
 
We can see flat roofs in traditionnal houses in for ex. Tibet, in some African country...
It's an idea which is promoted by some architecte such as Le Corbusier. Buwe can see also that some contemporary architects use slope roof for modern architecutre. The concept of fifth façade can be illustrared more fully if it is seen (which is not the case for flat roof). In the traditionnal chinese architecture, the volume of roof occupies almost half the total volume! In order to reduce the "heaviness", chinese roof is in curve and the slope changes so that it appears as a bird ready to fly, or a roolesd paper...  What roof to choose, it depends also to urban rules: many prescript in POS that a building/house must have a slope roof with certain % of slope!!! With the durablr architecture, the vegetalised roof is more and more accepted, should we change the POS prescription:
 
roof: any form which architect can justify... and ecological...
 
That will be really interesting...