regarding some technical problems, regarding the thermal rehabilitation program of the blocks older than 20 years in Romania

COMPARATIVE MEMO regarding some technical issues, referring to the thermal rehabilitation program of blocks older than 20 years in Romania One of the most important factors, which argue, the use of the LOOSELY VENTILATED INSULATION SYSTEM over the ADHESIVE INSULATION SYSTEM, is the high carbonation factor of the facades of blocks that are at least 20 years old.

Carbonation means the in-depth degradation of the plaster and even the concrete from the outer layer of the walls, which make up the facades of the blocks, due to the action over time and the high concentration of CO2 and SO2 in urban areas. The adhesion to these surfaces of ordinary mortars, based on Portland cement and sorted aggregates from river ballast (which also contains ballast resulting from freezing rocks – it crumbles after 2-3 cycles of freeze-thaw), hence the warranty offered on facades insulated with polystyrene is 2 years. The loosely ventilated system is preferable, as it has the advantage of aging (similar to carbonation), after 20-30 years from its putting into use. For the polystyrene and wool (classic) system to be adequate, the plaster must be cleaned and redone, as well as the use of a mortar with appropriate chemistry, which should contain quality synthetic resins in the right amount, quarry quartz aggregates, which makes it almost impossible to verify the quality of the materials used and implies very high real costs for implementing the system.


Thermal insulation with Thermomax system

Composition: thermal insulation material, metal fastening structure, layer of poorly ventilated air between the existing facade and thermal insulation panels. Dry system.

Thermal insulation with polystyrene

Composition: thermal insulation material based on wet installation procedures. Wet system.
Assembly: fast, dry, possible in any season , without stops due to bad weather, with the help of metal devices.
Assembly: in case of polystyrene thermal insulation, the works stop when it is RAINING or are LESS than 5 DEGREES.
LAMBDA heat transfer coefficient: for polyurethane foam 0.018 – 0.028[W/m*K] (smallest = best)
LAMBDA heat transfer coefficient: expanded polystyrene 0.030 – 0.038[W/m*K] ; basalt mineral wool 0.034-0.042 [W/m*K]
Safety in operation: the advantage of mechanical fastening of the system (with metal expansion joints of M8 * 80) in the inner layer of reinforced concrete of the prefabricated three-layer panel eliminates the possibility of detaching the material from the facades (including plaster). This is important for the safety of passers-by.
Safety in operation: gluing with adhesive and fixing with plastic dowels is a superficial grip , unsafe in the case of old blocks and conditioned by the use of high quality adhesives = higher costs. A lower quality adhesive (low price) can lead to the detachment of the tiles from the facade, together with the substrate – the existing plaster of the building (due to carbonation) – having serious consequences on the safety of passers-by.

Impermeability: due to the external protection, with aluminum sheet, pre-painted in electrostatic field, with polyester powders by tribokinetic effect and due to the fact that polyurethane foam has closed cells in proportion of 92%, does not absorb water vapor and therefore the system is waterproof .

Impermeability: due to its structure, expanded polystyrene absorbs and retains water . A decorative plaster with a high degree of protection against water absorption, involves high costs.
Hardness: the system ensures a high resistance to the action of compressive and shear forces, characteristics specific to Sandwich panels. Density of polyurethane foam: 45kg / m3 .
Hardness: expanded polystyrene (the most used material) – is a material with extremely low hardness and density 11 – 18 kg / m3 .
Fire resistance: rigid polyurethane, does not maintain combustion . Meets the most demanding requirements in the field of fire insurance of buildings, is certified in accordance with European standards in construction and is part of fire class B-S2-d0. The polyurethane foam used in the THERMOMAX system has flame retardant properties – it does not maintain combustion. It only deteriorates at temperatures of 700 ° C-800 ° C and then becomes brittle.
Fire resistance: in terms of fire behavior polystyrene, used so far in tires (2016), is a material that maintains and propagates combustion. The polystyrene softens at temperatures above 190 ° C and melts at temperatures of 240 ° C-300 ° C. Graphite polystyrene is treated flame retardant and does not maintain combustion, but melts at a very low temperature . For these reasons, according to European standards, polystyrene insulation is allowed ONLY in buildings not exceeding 12 m in height.
Lifespan: in the case of the THERMOMAX tire system, with aluminum panels with polyurethane foam, the lifespan is estimated at 50 years , in operating conditions specific to the geographical and climatic area of Romania.
Lifespan: in the case of the thermal insulation system applied by gluing, in the case of a correct application , it is about 20-25 years (average).
Joints and sound insulation: thanks to the joint system (dolphin type) the assembly time is greatly reduced and a very good flatness and increased safety is ensured. It is a very good sound insulator , due to the air layer between the panel and the wall.


Joints and sound insulation: in the case of polystyrene, other materials are needed for gluing, gluing and stabilizing the panels (adhesive, reinforcing mesh, dowels, corner profiles, primer, etc.).
Mold and condensation: by light ventilation, the air between the wall of the building and the panel, eliminates the possibility of condensation and moisture, mold. Polyurethane does not provide an environment conducive to the formation or maintenance of molds, fungi. It thus ensures perfect hygiene of the buildings .
Mold and condensation: when using the thermal insulation system by gluing on the facade, the building is sealed, energy is saved, but the construction over time is not protected – condensation, dampness, mold begin to appear . There must be a transfer between the air in the house that has already been used and the air outside. The polystyrene system does not let the building breathe creating the “bag” effect.
Ecology: at the end of its life, most of the materials used can be recovered and recycled (approximately 80%), resulting in its sale and an important amount for the beneficiary necessary for the next investment.
Ecology: as polystyrene is produced from petroleum products, it has a very high CO2 footprint and has a half-life of the THERMOMAX system, NOTHING can be recycled from this system.
Execution duration: for an area of 1800 MP, ie the equivalent of a Gf + 4 block with two stairs is 15 days with a team of 7 people.
Execution duration: for an area of 1800 MP, ie the equivalent of a GF + 4 block with two stairs is 90 days with a team of 20 people.


Total price per system, comparative in terms of quality

Total price of THERMOMAX system:
The total system price meets the cost standard
Total price of polystyrene graphite ETICS system:
Material 27 € / sqm and labor from 10 € / sqm