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ROOF INSULATIONRoof insulation is definitely worth it. It is an investment that is regained quickly and with which you can save a lot of money in the long run. The supply of insulation materials is quite extensive. In the overview below, you will find more information about the different types of roof insulation and their most important features.

Mineral wool

Kinds of mineral wool, such as glass wool and rock wool, are easy to incorporate and insulate well, seen thermally. Since mineral wool is relatively inexpensive, it generally offers the best value for money. Mineral wool is widely applied to the insulation of inclined roofs, attic floors, and hollow walls.

Glass wool

Glass wool is extremely suitable for the insulation of inclined roofs. This insulation material is easy to cut to size end because it can be pressed together, you can easily attach it between the rafters. Here, he stays on the spot. Glass wool sheets are economical, are very flame retardant and have good insulation value. When working with glass wool, protective gloves and a dust mask should be worn as the fibers may irritate the skin and lungs.


Rockwool is, just like glass wool, a mineral wool with excellent insulating characteristics. It is suitable for the insulation of inclined roofs but you can also isolate the attic floor. It has almost the same positive qualities as glass wool, but isolates better from an acoustic point of view. Rockwool is available in sheets or plate material. Rock wool is less irritating to the skin than glass wool but, also with rockwool, it is advisable to wear protective gloves and a dust mask.

glass wool watered

Waxed glass wool is a mineral wool with a woolly fine structure. It is used a lot for cavity wall insulation, but also for sloped roofs and ceilings. The material is then blown into the farmhouse (pushed down by a steam screen). Because of the optimal filling of the roof with fine blown wool, thermal bridges can be prevented, which is good for the energy supply of the roof.

Kinds of ecological roof insulation

When you find important ecological building, then you can look at roof insulation materials like sheep wool, paper flakes, wood straw or hemp. These materials not only have a small ecological footprint, but are also open to steam and have a high heat storage capacity, which is good for the indoor climate.

Sheep wool

Sheep wool is widely applied as an ecological roof insulation. It has good regulating characteristics of humidity, is not irritating to the treatment and isolates very well. It has a high heat storage capacity, which means that the climate inside is less subject to temperature variations. Sheep wool, it is known that it can absorb transient harmful substances in the air. However, it is one of the most expensive ecological insulation materials.

Paper flakes (cellulose)

The paper flakes are all made of recovered newspaper. Thus, the isolation of paper flakes is a way to isolate ecological.

Paper flakes have the advantage that they can absorb a certain amount of moisture in order to give, after, slowly. Besides the regulating characteristics of humidity, cellulose also has a high heat storage capacity (inertia), so that the spaces under the roof will be less quickly overheated.

Straw of wood

Just like other eco-friendly insulation materials, wood straw also has good moisture regulating characteristics and high heat storage capacity. Wood straw sheets can be easily made and tied between the rafters. The material does not irritate the skin.

The straw is suitable for post-insulation of different kinds of sloped roofs. Wood fiber boards are often used as an insulating sub-roof.


Cork is an ecological insulation material that comes from the cork oak. It is available in the form of a plate and in the form of a seed. In the form of a plate, it can be placed in several layers between the rafters of the roof. Cork seeds can be blown into the roof. Cork not only insulates well thermally, but also acoustically. However, it is one of the most expensive insulation materials.


The fibers of the hemp plant are very strong and, in terms of their structure, very suitable for the use of insulation sheets. These sheets are available in thicknesses from 30 to 190mm and can be applied for the insulation of inclined roofs or floors. Hemp is not suitable for use in humid conditions.

Kinds of insulation based on synthetic material

Synthetic materials such as EPS, XPS, PUR and PIR are all (heavy) chemical petroleum scums. They are lightweight materials that insulate well and are insensitive to moisture. This is why, especially, plastic insulation boards (such as PIR insulation boards) are very suitable for the insulation of flat roofs or for use in damp surroundings such as facades. and cellars.

PUR sprayed

Spray polyurethane foam (PUR) insulates very well, is not sensitive to moisture and, in this way, very durable. As the foam fills very well the slits under the roof, there is a seamless roof without thermal bridges.

PUR foam can be put in all kinds of thickness. It is not the most environmentally friendly material or steam open, but, from a thermal point of view, it gives the best results.

PIR insulation plates

PIR insulation boards (polyisocyanurate) are very suitable for the insulation of flat roofs. They repel moisture, have a high insulation value and are fixed with regard to pressure. We can continue to walk on the roof during and after the work. PIR is fireproof and easy to incorporate. Next to roof insulation, it is also suitable for the attic floor.

What type of roof insulation?

What kind of roof insulation you choose the best, depends on a few factors like the type of roof (flat or sloped), the rental of insulation material (inside or outside), the available budget and personal preference.

  • When you find important ecological construction and you are willing to invest in it, then look at sheep’s wool (or other eco-friendly material) for the insulation of an inclined roof.
  • Your budget is not too big and you still want to save a lot of energy? Then choose glass wool or rockwool. In this case, you choose a good price-quality ratio.
  • If you want to insulate a flat roof or an inclined roof from the outside, then choose plastic insulation boards (eg PIR).

• Do you want a product with the highest thermal insulation value possible? Then you could consider the PUR sprayed. Bear in mind that this is one of the mo

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