It’s Possible to Approach Nearly to Passive House Conditions With Appropriate Insulation Thickness


It’s Possible to Approach Nearly to Passive House Conditions With Appropriate Insulation Thickness

One of the major mistakes on insulation is applying insulation using thin and bad quality materials. Using “Thicker" insulation materials improves economy proportionally while not increasing other costs in the system. For example, if 12 cm of insulation is applied instead of 6 cm in exterior thermal insulation system, insulation progress costs increase between 43-66% while potential of saving increase 100% depending on the selected insulation material. Buildings that are called low energy, zero energy or plus energy are the best example of increased savings. Design is the most important step for these buildings and using thicker insulation materials decrease the need of energy.

Izocam Sales and Marketing Vice General Manager Fatih Oktem
indicates that by applying thick insulation to the houses in hot regions from top to bottom, it is possible to both avoid structural problems in winter and provide comfort by protecting from the heat in summer. “We can reduce energy consumption that is used for cooling in summer and heating in winter by applying thicker insulation for the houses in hot regions. A house in Bodrum, Antalya or Cesme also requires insulation as much as a house in Istanbul does. The most important thing here is applying the appropriate insulation thickness for climate conditions in accordance with the regulations. Insulation thickness differs from district to district, even from sub-district to sub-district. For example, it’s necessary to apply at least 6 cm insulation for the walls and at least 10 cm insulation for the roof in a house located in Datca. According to the regulations, these thicknesses are also applicable for significant sub-districts such as Fethiye, Datca, Marmaris and Gokova. For example, zero energy houses, in another words Passive Houses, provide 100% energy efficiency thanks to the application of insulation with high thickness. Therefore, approaching to the thicknesses in Passive House criteria will make us come a long way in energy efficiency by insulation. For this reason, increasing and revising insulation thicknesses described in the TS 825 will get us near to the Passive House conditions which is aimed in developed countries. For instance, according to the TS 825 Thermal Insulation Rules in Buildings Standard, while at least 8 cm insulation on the walls, 8 cm insulation on floors and 12 cm insulation on the roof are enough for a house in Gaziantep, future foreseen energy efficiency is only possible by applying at least 40 cm insulation on the walls, 30 cm on floorings, 30 cm on the roof to achieve the conditions that comply with the standards of the first certified passive house of Turkey.

Market share of the insulation industry in Turkey is 16 million m³ and insulation consumption per person is 0.2 m³. In Europe, insulation consumption per person is 0.7 m³ annually. It’s also a fact that insulation consumption per person is 1 m³ in the US while the market size is approximately 260 million m³. Analyzing this data, we can conclude that raising awareness of “thick insulation” in Europe and the US has been proven successful. And it’s not coincidence that thick insulation is widespread in these regions as the government promotions play a huge role in it. For example, $6,500 per house in USA, £4,000 in Ireland and 50% of insulation applications in Italy are endowed.  It’s necessary to perform applications that will give best results depending on regions and extending "thick insulation" awareness in our country. Almost 75% of current housing stocks in Turkey is not insulated in accordance with TS 825 Thermal Insulation Rules in Buildings or not insulated at all. Further increasing thermal insulation thickness described according to the limit values in TS 825 Thermal Insulation Rules in Buildings will be effective for buildings´ long term performances. Especially new buildings built after the year 2000 meet the thickness criteria described in the TS 825, but it can be clearly seen that such thickness levels are not enough compared to developed countries and the standards should be revised in the frame of sustainability and low carbon economy as well as ideal thickness levels should be applied immediately.    

TS 825 Thermal Insulation Rules in Buildings Standard predicts that if both cooling and heating are applied in buildings, insulation thickness in country-wide varies with 6-12 cm on the walls and 10-18 cm on the roof depending on 4 different climatic regions on the basis of degree/day values. In countries in which climatic conditions change throughout the year, such as Turkey, thickness of insulation differs depending on regions. While the lowest insulation thickness that is predicted for sub-districts located in high zones where heating is important such as Arhavi and Hopa in Artvin is about 6 cm on the walls; while for coastal regions where cooling is more important including Bodrum and Ayvalık, minimum 6 cm insulation thickness on the walls may be required. 8 cm insulation thickness is required for the 2nd district of Istanbul. 10 cm for the 3rd district of Ankara and 12 cm for the 4th district of Erzurum are identified as the lowest thickness levels for the walls of buildings in which heating and cooling are applied. However, the right thing to do is to double these values. Izocam underlines that with right and thick insulation, it’s possible to provide complete protection and have more comfortable summer houses.

Although it’s possible to have maximum benefit and efficiency by using thicker insulation materials, these opportunities are wasted because of lack of knowledge and inspection in the field. While 4-5 cm of insulation thickness is considered in practice in our country, the value differs from 20 to 50 cm in European countries.


For information:

Seher Saygin / Essance Istanbul Communication Consultancy
(0212) 282 40 85 /

Zeynep Yigit / Essance Istanbul Communication Consultancy
(0212) 282 40 85 /


It’s Possible to Approach Nearly to Passive House Conditions With Appropriate Insulation Thickness