DOCUMENTATION AND RESOURCES
Thermotop combines the high thermal performance of PIR boards with the advantages of local production. Manufactured in Romania, our boards are available immediately and can be delivered quickly nationwide or anywhere in South-Eastern Europe, guaranteeing competitive prices, immediate availability, and a reliable partner for all your projects.
What are PIR insulation boards
PIR insulation boards are rigid boards made of polyurethane foam with a closed-cell structure, designed to provide high-performance thermal insulation, high compressive strength, and good fire behavior. The fine structure with gas-filled cells creates an efficient barrier against heat transfer, significantly reducing energy losses. Due to this structure, PIR boards have the highest dimensional stability among all insulation materials, maintaining their mechanical and thermal properties over long periods.
THERMOTOP Advantages
Every project becomes more efficient with Thermotop PIR insulation boards. They contribute to optimizing overall construction costs, reduce heating and cooling expenses, maximize usable space, and are installed quickly and easily. Additionally, their durability transforms any building into an energy-efficient and sustainable space.
Lowest conductivity coefficient λ=0.021 W/mk
Insulation up to 100% higher compared to traditional insulation materials
High compressive strength
Dimensional stability - does not shrink, does not expand, does not change thermal properties
Does not allow moisture penetration
Not a source of food or shelter for rodents
Ideal for new buildings and renovations
Chemically inert and safe to use
Low weight of the boards
Avoiding thermal bridges due to "L" type joint
Increased thermal resistance with reduced thicknesses
High resistance to extreme weather conditions
Compatible with any type of waterproofing membranes
Compatible with any type of plasters and exterior finishes
Does not contribute to fire propagation
Resistance to chemicals and petroleum-based solvents
Does not allow the development of microorganisms, fungi, or mold
Sustainable and Ecofriendly
Thermal conductivity
C – Thermal conductivity coefficient (λ, lambda) [W/mK] – is the physical quantity that shows the extent to which a material transmits heat (through thermal conduction). The thermal conductivity coefficient is the amount of energy (heat) transmitted per second (Joule/second, i.e., Watt) crossing a material with a thickness of 1 meter, when there is a temperature difference of 1 Kelvin between its faces. The lower the λ value, the less heat the material conducts and the better its insulating performance.
Thermal transmittance coefficient
U – Thermal transmittance coefficient [W/(m²·K)] = the ability of a material to transfer heat. The lower the U, the better the element insulates.
Calculation formula: U = λ / d
Thermal resistance
Thermal resistance is the ability of a material to oppose heat transfer. The higher the R value, the better the material acts as a thermal insulator, saving more energy.
Thermal bridge
An area in a constructive element or in a joint between elements where thermal insulation is discontinuous or diminished and where energy losses occur between the interior and exterior.
Dew point
The temperature at which water vapors in the air begin to condense and turn into water droplets when the air is cooled at constant pressure.
Air tightness
Represents the ability of a building’s envelope to prevent uncontrolled air circulation through cracks, joints, or non-tight areas. A well-sealed building limits heat loss, prevents condensation and mold formation, reduces energy consumption, and increases thermal comfort.
Thermal insulation is essential in achieving building air tightness. By using THERMOTOP PIR boards, you obtain a continuous barrier against air transfer, due to the “L” type joint. Thus, the risk of infiltration decreases, and the building structure is protected and contributes to maintaining energy performance in the long term.
PIR and other insulation materials
Thermotop insulates better than other traditional materials. A 100 mm THERMOTOP PIR board has a thermal resistance of 4.76; to achieve the same value with traditional materials you need:
176 mm* mineral wool,
170 mm* expanded polystyrene (EPS),
140 mm* graphited polystyrene.
*Values were calculated with a thermal conductivity coefficient of 0.037 W/mK for mineral wool, 0.036 for expanded polystyrene, 0.034 for extruded polystyrene, 0.031 for graphited polystyrene.
PIR and fire safety
Fire safety is essential in any construction project, and at the European level and in Romania, it is well regulated and establishes clear requirements regarding the reaction to fire and fire resistance of materials and constructive systems. Thermotop PIR boards offer high performance due to their structural stability and predictable behavior in case of fire.
Reaction to fire
Reaction to fire concerns how a material behaves or contributes to the development of a fire in the initial phases. Classification is established according to EN 13501-1 and is expressed by a code such as B-s2,d0, C-s3,d0, etc., based on three criteria:
- flammability (A–F),
- smoke production (s1–s3),
- and the formation of flaming droplets/particles (d0–d2).
In the ETICS system, THERMOTOP PIR boards have a B-s1d0 reaction to fire class, being one of the solutions that meet fire safety requirements for building envelopes.
Fire resistance
Fire resistance refers to the performance of a constructive element, a self-supporting structure, in a fully developed fire. According to EN 13501-2, the evaluation includes:
R – load-bearing capacity,
E – integrity,
I – insulation
Thermotop has developed two roof systems for industrial and civil constructions, Thermotop Roof System REI 30 and Thermotop Roof System REI 20, certified with REI30 and REI20 fire resistance.
THERMOTOP PIR boards and energy efficiency standards
Building energy efficiency is regulated at both European and national levels through requirements targeting building envelope performance and energy consumption reduction. THERMOTOP PIR insulation boards are designed to meet these requirements, offering low thermal conductivity and excellent long-term dimensional stability.
With a thermal conductivity coefficient λD ≤ 0.021 W/mK, THERMOTOP PIR boards allow for low U-values of the building envelope elements, directly contributing to meeting nZEB (Nearly Zero Energy Buildings) standards. The main benefits of thermal insulation with THERMOTOP are:
- Optimization of general construction costs
- Reduction of heating/cooling costs for spaces
- Reduction of installation times
- Optimization of material losses
- Resistance and durability for decades
THERMOTOP in projects
Discover projects where insulation becomes part of the final solution
Certifications, technical assessments, and technical documentation
Download the latest certification documents and technical assessments for THERMOTOP PIR boards, as well as product technical documentation and DWG files for thermal insulation systems
DECLARATIONS OF PERFORMANCE
PRODUCT TECHNICAL SHEETS
DWG FILES
- Pitched roof thermal insulation constructive detail between and under rafters
- Pitched roof thermal insulation constructive detail over rafters
- Pitched roof attic slab thermal insulation constructive detail
- Foundation and concrete slab thermal insulation constructive detail
- Heated floor thermal insulation constructive detail
- Non-walkable terrace thermal insulation constructive detail
- Green/Vegetated terrace thermal insulation constructive detail
- Facade thermal insulation system decorative plaster constructive detail
CONSTRUCTIVE DETAILS PDF
- Pitched roof thermal insulation constructive detail between and under rafters
- Pitched roof thermal insulation constructive detail over rafters
- Pitched roof attic slab thermal insulation constructive detail
- Foundation and concrete slab thermal insulation constructive detail
- Heated floor thermal insulation constructive detail
- Non-walkable terrace thermal insulation constructive detail
- Green/Vegetated terrace thermal insulation constructive detail
- Facade thermal insulation system decorative plaster constructive detail
About us
Thermotop is the first manufacturer of PIR thermal insulation boards in Romania, with a 9,000 m² production unit located in Ghimbav, Brașov, being also the largest factory of this type in Southeastern Europe. With an annual production capacity of approximately 6 million m2, we are present on the local market and in six countries in Southeastern Europe, offering high-performance thermal insulation solutions for new constructions and renovations, in the civil, commercial, industrial or agricultural fields.
Our products are designed to meet the highest standards in the field of thermal insulation, playing an essential role in reducing energy consumption and maximizing thermal comfort, directly contributing to the sustainable development of the construction field.
We are committed to using the most advanced production technologies, with minimal impact on the environment. Care for the environment and respect for our customers and partners are fundamental at every stage of the production process – principles that guide us in strengthening our role as a responsible leader in the thermal insulation materials industry.
The first PIR board factory in Romania
Opened in 2025, THERMOTOP is the largest PIR production unit in Southeastern Europe
Premium thermal insulation solutions
We produce solutions for reducing energy consumption and increasing thermal comfort
Sustainability
Advanced technology with minimal environmental impact and respect for the future
6.000.000 m2
Annual production capacity of PIR thermal insulation boards
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