This exciting new roofing system provides a flexible room in the roof solution capable of providing the thermal performance that will increasingly be required by the planned revisions to Part L of the Building Regulations. The MiTek Posi-Strut™ technology ensures that the roof panels are lightweight and easy to install. The system arrives on site, felted and counter battened ensuring that the roof is watertight in a short period of time.
The environmental benefits include the low U-Values that the system can achieve of 0.17 W/m²K; timber’s impeccable sustainability credentials; and the design of the loft as a “cold area” thus further reducing the energy consumption of the dwelling.
Based on a MiTek Posi-Joist™ floor, the working platform for the Posi X-Rafter roof is assured with the use of laser levels.
Flat top spandrels are positioned incorporating location slots for the ceiling cassettes. The spandrel panels are stubbed as required by the roof dimensions.
The structural ceiling cassette incorporating the roof support purlins are located. Timber frame dwarf walls are positioned to provide a second Posi X-Rafter support.
Apex spandrel panels are positioned using the structural ceiling as a safe working platform.
Posi X-Rafter cassettes are positioned and fastened to the supports. Posi X-Rafters are insulated at the point of manufacture and are pre-felted and battened.
The underside of the Posi X-Rafter cassette is clad with OSB in the room area only.
Dormer windows are easily catered for by the system.
Insulation material costs are lower than competitive systems as the loft area is a cold area, reducing the energy consumption of the dwelling.
Call us for information on how to get licensed Posi X-Rafters.
Ideal for use in narrow fronted gable to gable housing, the X-Rafter system starts with flat top structural gable panels, fixed to offsite manufactured Posi-Joist™ floor cassettes.
Spanning between the two structural gable panels, the next element of the X-Rafter system to be positioned is a pre-fabricated structural ceiling cassette with up-stand beams to provide the support for the X-Rafter roof cassettes.
Pre-Insulated, felted and counter battened offsite, the X-Rafter cassettes are craned into position.
The Posi-Joist cassette floor and the structural ceiling cassettes form two safe working platforms providing that the appropriate harnessing is worn by the installation team.
The apex spandrels are lowered into position to complete the cold roof space above the pre-insulated ceiling panels.
Wind and water tight in hours not days, the X-Rafter combines health and safety benefits with all the benefits of offsite timber engineering manufacture. Contact MiTek for further information.