Lahijan traditional houses:
Lahijan is located in the north of Iran near Caspian Sea. High humidity ,large amount of rain and temperature stability play important role to shape the houses there. high humidity could bring mould to building,therefore proper ventilation is required. Traditional houses in lahijan have special design  in order to use low amount of energy and  to adjust the building to region climate. According to Ghorbani Nia (2013) because daily temperature usually do not have fluctuation, walls are made of light materials such as wood which is local material and are covered with plaster or clay in order to increase ventilation. Furthermore these walls do not have high thermal capacity in order to save heat for night.White colour of walls usually helps to reflect the sunlight in summers . There is gap between houses and ground to increase the ventilation from floor for buildings. furthermore porches are located in four side of building to provide more ventilation. Roofs in these houses are made with rice stalk that is local material. furthermore because of large amount of rain in this region the slop of roofs are high. For these reasons these kind of houses could be considered as sustainable structures. 

http://fouman.com/Y/Picture_View-Gilan_Roodbaneh_Traditional_House.htm

Source:

Source:
Ghorbani Nia,E (2013) Architectural Structure and Environmental Performance of Sustainable Lahijan Vernacular Settlements, N Iran , International Journal of Environmental Protection,Vol. 3 Iss. 1, PP. 15-2.