A ground roof is a sustainable element in which using a certain thickness of ground can reach the desired thermal and climatic comfort. On the northwestern border of Mexico, with an emphasis on desert areas, there is a need to compose solutions that measure the heat gain problems caused by climatic conditions. The heat gain is caused mainly by solar rays that occur in summer; the ground roof creates an insulating layer which helps to reduce the flow of heat, which in turn with the volume of ground helps maintain and lower stable temperatures. To evaluate the thermal performance of a ground roof, with the weather conditions of the metropolitan area of Mexicali, the simulation will be carried out. The ground roof are analyzed with different ground thicknesses and measurement periods are established, according to the specifications in standards ASTMC-1046-95, ASTMC1155-95. The thicknesses were simulated with the Ener-Habitat program. In the results it has been obtained that in a concrete cover the temperatures will be higher in contrast to the temperature of the environment and that of the ground roof.

The condition of climate change is attributed directly or indirectly to activities related to the human being, as a more transcendental effect the increase of temperature is highlighted. Such a condition is not taken into account in the development of current constructions, so it is sought to propose the use of thermal insulating materials that will give a thermal comfort to the user and a reduction of energy use, which in turn will be an environmental advantage. There are various types of thermal insulating materials, however, it is proposed to be sustainable, as it is intended not to contribute to climate change and to meet the appropriate specifications of the building envelope, in order to ensure the users comfort of current and future dwellings, different factors, such as orientation, as well as specific parameters, will be taken into account as part of the development of the aforementioned ones. The construction development of the current house-room does not take into account the continuous thermal alterations that occur by the continuous climate change, ignoring the basic needs of the thermal comfort of the user; so sustainable materials are recommended, which meet thermoinsulating properties without causing an environmental impact.

This research focuses on the analysis of the thermal comfort behavior for the social interest housing, caused by the lack of adaptations to the predominant Mediterranean climate (warm-dry) of San Pedro Valley, Tijuana B.C. located at latitude 32°29'47"N and longitude 116°58'26"W, these conditions occur in the cold period during December, January and February, when minimum temperatures are between 3.5°C and 4.4°C. The Design Builder simulation was carried out by validating results against continuous measured data of the dwelling during the aforementioned periods, analyzing the internal temperature of the dwelling. The simulated coating material was polystyrene, which due to its thermal conductivity characteristics, allows to reduce thermal discomfort in to the social interest housing, contributing to the comfort improvement of the living space, showing it by results of the simulation tool. In this way the polystyrene coating alternative for the housing envelope, is a solution that allows to increase the hours of comfort within the space by bringing the indoor temperature closer to the comfort zone established for the local conditions during the cold period.