Ventilated subfloor

• Possibility of 40 mm ventilation ducts in the floor
• Can be combined with ventilated wall solution
• Clear drawings with calculated airflow

The Granab system is an excellent choice for renovations related to moisture or mould damage. Our systems for this type of project are made of galvanised steel and are consistently made of non-organic material, which is necessary for this type of project. With smooth height adjustment of the subfloor system, it adapts to your home while continuously ventilating the air in the space between the lower and upper floors. It is easy to install and has many advantages over subfloor systems made of organic material. Below you can see a video of how our solution works in practice.

Ventilated floors create an air gap on top of the concrete slab that is continuously ventilated by a fan. The system works by moving air from the room into the air gap via negative pressure, where the moisture and other emissions are transported away from the building through ventilation ducts. The fan is a central component that creates negative pressure and effectively extracts bad air from the floor structure. This mechanically ventilated floor is particularly important in basements and houses with slabs on grade where problems with moisture often occur.

Our mechanically ventilated flooring solves the problems of damp, odour and mould that many houses suffer from. By ventilating the moisture directly from the source, you get a healthier indoor climate. The system also removes radon and other dangerous gases often found in soil and concrete slabs.

The system can be customised to your specific needs with an adjustable construction height from 30-480 mm. You decide the positioning of the fan, type of air inlet and upper floor construction. The Granab system also facilitates future renovations as it is easy to access installations in the floor construction. It is an excellent choice for those who want flexibility and the ability to customise the floor for future renovations.

Our ventilated flooring can also be combined with other systems to solve different types of problems in the house. For example, you can add insulation, underfloor heating and other customisations on top of the system, giving you maximum flexibility for your living or working environment.

• Fan location
• Type of air inlet, floor or wall grille
• Location of air inlet
• Internal fan or facade fan

Galvanised steel has many advantages over organic materials when it comes to projects related to moisture or mould damage. Galvanised steel girders retain their dimensional stability and are not affected by moisture or temperature changes. In addition, it eliminates the risk of creaking or unwanted failure that can be caused by drying out or moisture exposure of floor girders in organic materials, such as wood joists. As the Granab system is made of non-organic material throughout and is not affected by moisture, you can rest assured that it is a long-term solution that will live up to your expectations.

Granab in combination with mechanical ventilation allows you to efficiently ventilate away any moisture and emissions from the slab.

The Granab system weighs only 5kg/m² compared to conventional casting which weighs 100-200kg/m². This makes the system ideal for attics and extensions where weight is a critical factor.

In addition to ventilation, our ventilated floors also provide excellent impact and airborne sound insulation. The system fulfils the sound requirements of Swedish standards by a large margin, which is important for a good living and working environment.

Our subfloor system has up to 50% less CO2 impact than concrete and is EPD (Environmental Product Declared). As the material is non-organic, you don’t have to worry about moisture creating new problems in the floor construction.