Achieving a high performance standard requires a detailed and holistic design from the outset. The Biond design process includes:
- Best practice modern architectural design principles, which deliver high thermal performance and enhanced comfort
- Elimination of thermal bridges at the design stage
- Thermal modelling to calculate the likely level of performance
- Use of high performance materials, including the Biond panel system and triple glazed timber windows
- Planning for airtightness and ventilation from the outset
The services strategy is an integral part of the overall Biond process. It takes advantage of the ‘fabric first’ approach to thermal design, which minimises redundancy and delivers comfortable living with minimal heating and energy requirements.
The services strategy normally includes:
- Mechanical ventilation and heat recovery (MVHR) to ensure energy-efficient fresh air flow and humidity control by recovering heat from air that is being extracted
- Underfloor heating to provide warmth when required
- Photovoltaic (PV) panels or heat pumps to produce energy with minimal impact to the environment. (Due to the low energy requirement of the Biond system, energy can also be taken from the grid at a low cost.)
The substructure is designed and built to minimise thermal bridging and deliver a U value of 0.1W/m²K, but with a reduced carbon footprint where possible.
To achieve this we seek to adopt the best technology available, such as:
- Insulated plinths
- Low cement-based concretes such as Cemfree or other high GGBS replacement mixes
The superstructure is manufactured in our factory to precise tolerances. This ensures that panels fit closely and are easy to erect. Erection on-site is complete within a few days for standard houses. We aim to deliver a weather tight superstructure within three weeks.
Accelerated construction is achieved thanks to the following innovative processes:
- Walls are insulated in the factory with hemp, lime and woodfibre, to deliver U values of 0.15W/m2K as a minimum standard. This can be enhanced where required
- Floor and roof cassettes (with insulation and roof lights fitted) can be manufactured in the factory to speed up construction and ensure high quality standards
The airtightness membrane is designed into the process from the beginning. We aim to deliver airtightness of less than one air change per hour at 50Pa. Tests are carried out before finishes are applied and again at the end of construction to ensure that targets are met.
We provide full training to the homeowner to help them run the house and the systems. In addition, we set up a monitoring process that allows homeowners to measure the actual performance. Ongoing support is also available if requested.