Saturday 6 March 2021  

Roof Insulation

The roof is probably the most exposed part of a building's envelope, affected both by high temperatures during the summer, as well as by low temperatures in winter.  Therefore, the construction solution selected, as well as the finishing surface chosen, have to be suitable for each structure's particular needs and requirements.  Basic parameters for the design of a roof structure are the climatic conditions of the area where this is located and the building's position in relation to the plot's microclimate.

In addition, the roof ought to have sufficient thermal insulation, to provide sound insulation, as well as to satisfy the fire resistance requirements of the design.  Consequently, the selection of the insulation material should combine all of the above.

Stonewool is the ideal material, since it provides in combination excellent thermal insulation, high mechanical strength--both for static and dynamic loads--, satisfactory sound insulation and fire resistance to the roof structure.

Roof Construction Typologies

The solutions applicable to roof construction may be categorized according to the substrate or the position of the insulation material.

The basic substrates common in structures are reinforced concrete, metal and timber.

The advantages each solution presents are summarized as follows:

Reinforced Concrete

- Very effective waterproofing

- Facile construction of necessary roof slope for the effective flow of rainwater to the guttering

- Creation of a habitable roof surface

- Creation of green roof


- Lightweight construction

- Minimized construction costs

- Long life span of the construction

- Fast construction

- Flexibility in the selection of the appropriate roof construction solution


The position of the insulation material categorizes the roof construction into: 

Warm roof:  when the insulating layer is placed above the roof's structural elements (e.g. reinforced concrete slab, rafters), without the requirement for a ventilated air gap under the roof deck. The warm roof type exploits the thermal mass of the structural elements, whilst the insulation protects them from wearing caused by temperature fluctuations.

Cold roof:  when the insulating layer is placed below or between the roof's structural elements (e.g. reinforced concrete slab, rafters), with the requirement for a ventilated air gap under the roof deck or a breathable roofing membrane.  The cold roof type does not exploit the thermal mass of the structural elements.

Products for Roof Applications 






FIBRANgeo BP-021

FIBRANgeo B-571

FIBRANgeo B-051

FIBRANgeo B-570-YM

FIBRANgeo B-570-AX

FIBRANgeo R-050-AX

"First Aid"

Basic Characteristics of Roof Thermal Insulation


Technical Brochures

Roof Thermal Insulation

Construction Details

Construction Drawings

Useful Links 

European Committee for Standardization


European Organisation for Technical Approvals


Center for Renewable Sources (Greece)


Hellenic Ministry of Environment Energy & Climate Change


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