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Timber \ Steel Frame Method of Construction

The emphasis with the system is to design a Part L1A specification to the level of performance required using the fabric first approach or FEES. The fabric first approach is achieved by the designing the U value; the thermal bridge; and air permeability of the fabric to a high standard and not to rely on the more expensive fixed building specification.

U Value:

The timber/steel frame method of construction needs to use a breathable material in between the studs, rock and glass wool, the breathable natural materials are the most common. Breathable spray foams are now being introduced to the timber frame type of construction and can also act as an air barrier.

Thermal Conductivity:

Before starting to design a Part L1A specification the designer needs to choose which typical details for the ground floor, intermediate floor and eaves are most suitable for their project as these details affect the calculation of the thermal bridge calculation.

It is important that the designer provides these details for the builder at tender stage and that the builder downloads the customised fabric compliance documents from the building control system and signs them off.

Air Permeablity:

The designer needs to decide on a level of performance they require Current , FEE, Extreme Fabric. The design, the more complicated the building is with construction joints and features the harder it will be for the builder to make the dwelling air tight, the more construction joints and features a dwelling has the more heat will be lost from the building affecting the y actor calculation.

It is important that the design professional has decided on which method of construction, typical details, insulation materials, performance level they require before they enter into the design process in the design section of this system.

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