Supporting roof sheets
Purlins provide horizontal support for the sheets and form part of the framework for the building. Minimum recommended purlin size is 4”x 2” (50mm x 100mm) in timber or Z140mm x 1.6mm in steel*. All purlin joints must be supported by a rafter. Z Purlins are connected to the rafters using cleats.
* Minimum purlin size will vary according to span. Timber Tek screws should not be used on anything smaller than a 2" x 2" timber support as the aggressive thread may split smaller timbers
Purlin Spaces
Box profile and traditional 3" corrugated
- 0.5mm gauge
- Recommended 600mm
- Maximum 1000mm**
- 0.7mm gauge
- Recommended 1000mm
- Maximum 1400mm**
**Maximum purlin spaces are not suitable in all scenarios. You will need to consult a structural engineer to see if these will be appropriate to your building.
Tile effect
- Wave-Tile 350mm tile length – maximum 700mm purlin centres
Help guides provides general advice of how to measure up and install a single skin roofing system. Due to the complex nature of some buildings, the information in our guides are not comprehensive and different techniques will be applicable depending on the building scenario. More specific guidance can be obtained by contacting our technical team on 01384 273811
Using the information in our guides are at your own risk. Accord Steel Cladding Ltd accept no liability for any loss or injury caused by following the information in our guides. If you are unsure about how best to install your roof, we would recommend contacting an experienced builder/roofer.
Please click on a link below for further information regarding installation of our products:
