Skillion Roof Construction Nz

In australia a skillion roof is also commonly called a shed roof.

Skillion roof construction nz.

Ensure the product is installed and all cavities dry. A skillion roof is different from a standard flat roof though it has a steeper and more noticeable pitch. The roof space is generally inaccessible with little natural ventilation and the small roof space can accelerate problems with moisture. Insulation 2nd edition this book describes the statutory requirements for insulation and the different types of insulation available in new zealand.

The skillion roof is somewhat different in that it only has one single flat surface. In skillion roofs the space between purlins and insulation is usually limited to 25mm meaning airflow below the roofing underlay is extremely restricted. 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. Hip roofs and gabled roofs have at least two sloping sides which meet towards the centre of a building in a ridge or peak.

Specifically designed for skillion roofs provides new zealand building code nzbc levels of thermal insulation while providing minimum ventilation clearances. Skillion roof airflows modelled airflow simulations were carried out for a monopitch skillion roof with profiled metal roofing with and without eaves. If the product is wet replace before installing. Skillion roofs need carefully designed and installed ventilation to reduce the risk of moisture related problems.

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. Skillion roof insulation may only be installed in roof cavities and is not suitable for installation in walls. 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. The roof could be constructed on or off site.

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. The application of the system can be installed from above or beneath the roofing cladding. This creates a higher risk of condensation which can ultimately cause damp mould and structural decay.

The building in the model has a 12 m long roof with 300 mm deep eaves. What is a skillion roof. Skillion or exposed rafter roofs were framed up on site.