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Last edited 03 May 2018
Ventfill Passive Venting Insulation - Case Study
Location: Haddington, East Lothian, Scotland
System: Stylite Ventfll EPS150 / EPS70
Size: 1,500 m2
This ﬂagship development of 49 retirement properties, in the historic town of Haddington, had a problem with naturally occurring ground gasses as a result of the underlying geology. In line with Building Regulations, the contractor had to consider the potential risks associated with these gases and how they might ingress into the properties if not dealt with accordingly.
The contractor wanted a passive ventilation system, beneath the footprint of the properties, which would disperse any ground gasses to the atmosphere via a series of
perimeter wall vents. The system would also need to be strong enough to support the
ﬂoor loadings and provide the necessary thermal requirements.
 Design consideration
Styrene Packaging & Insulation Ltd (SPI) were approached by the client and asked if
a solution could be designed. SPI’s technical team were able to quickly design and provide a sample of a passive ventilation board to the client for approval.
The Stylite Ventfill boards are manufactured from lightweight Expanded Polystyrene
(EPS70) and comprised of a 'wafﬂe'-like design on the underside to allow efficient venting of any gases.
Delivered in board sizes of 1,200 mm x 1,200 mm the Stylite Ventfill system was installed on a gravel substrate and then overlaid with sheets of EPS150 at a thickness of 70 mm.
To complete the system a membrane was installed along with the screed topping.
 Key benefits
The Stylite Ventfill offered the following key benefits to our client:
- Efficient venting of gases
- Excellent thermal performance
- High compressive strength
- Minimal water absorption
- Lightweight and cost effective
Due to the design of the system any gases from the ground are now efficiently dispersed
through the 'wafﬂe' structure and out into the atmosphere via the perimeter wall vents, whilst the thermal properties of EPS have achieved a ﬂoor u-value of 0.14 W/m2K.
 Find out more
 Related articles on Designing Buildings Wiki
- Beam and Infill Suspended Floors.
- Beam and Polystyrene Block Suspended Flooring - Case Study.
- Insulation for ground floors.
- Profiled and cut to fall roof insulation - case study.
--Styrene Packaging and Insulation Ltd 12:19, 10 Apr 2018 (BST)
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