Skillion Roof Construction Nz

The roof space is generally inaccessible with little natural ventilation and the small roof space can accelerate problems with moisture.

Skillion roof construction nz. Nz foam provides a skillion roofs insulation system that can enhance the reduction of heat cold loss that will exceed the minimum r value under the new zealand building code nzbc 1. Modern architectural homes use a variety of roof designs and mammoth skillion sections can be used in any roof design where the ceiling runs roughly in parallel to the roof line. This creates a higher risk of condensation which can ultimately cause damp mould and structural decay. The skillion roof is somewhat different in that it only has one single flat surface.

The building in the model has a 12 m long roof with 300 mm deep eaves. It covers insulation of the thermal envelope of the building walls ceiling roof and floor as well as windows and rooflights. Retrofit of insulation in skillion roof cavities is typically done when the roof cladding is removed. Cathedral style roofs and raked ceilings are generally skillion roof constructions where the ceiling line and roof line are in parallel.

Ensure the product is installed and all cavities dry. Skillion or exposed rafter roofs were framed up on site. In skillion roofs the space between purlins and insulation is usually limited to 25mm meaning airflow below the roofing underlay is extremely restricted. What is a skillion roof.

Specifically designed for skillion roofs provides new zealand building code nzbc levels of thermal insulation while providing minimum ventilation clearances. Skillion roofs need carefully designed and installed ventilation to reduce the risk of moisture related problems. The dimensions of the building are not critical and chosen only to show the effect. Off site roof framing consisted of prefabricated timber trusses while on site roof framing consisted of a framework of rafters ridgeboard or a ridge beam underpurlins and underpurlin struts and collar ties and cleats.

Hip roofs and gabled roofs have at least two sloping sides which meet towards the centre of a building in a ridge or peak. The roof could be constructed on or off site. Insulation 2nd edition this book describes the statutory requirements for insulation and the different types of insulation available in new zealand. In australia a skillion roof is also commonly called a shed roof.

If the product is wet replace before installing. A skillion roof is a roof that tends to have one sloping surface in contrast to a gable or hip roof that tends to have two or more sloping surfaces meeting near the middle. A skillion roof is different from a standard flat roof though it has a steeper and more noticeable pitch.