"Did You Know?" Industrial Sheeting
Often overlooked by Roofers, sheet roofing is an easy string to add to your bow. It opens you up to a wider range of projects such as; large scale industrial roofs, agricultural sheds or even smaller projects such as car ports or outbuildings. It is a quick and relatively easy process that is simple to embrace!
The First aspect that you will need to address is whether your project requires; single skin, double skin or a composite panel system. So what are they?
A single skin sheeting is where a single layer is installed without insulation; this can be metal, fibre cement or bitumized material.
Cost effective and quick installation with coating guarantees of up to 40 years.
With metal sheeting you can get condensation issues with some applications although anti condensation fleece backed metal sheeting is available.
BUILT UP (TWIN SKIN SHEETING SYSTEM)
A twin Skin system is the build up of a liner sheet, spacer system, loose insulation quilt, finished with a top weathering sheet. Changing the spacer system gap and insulation gives the flexibility to achieve a range of thermal performance (‘U’ value)
Great for refurbishment projects, where the existing sheeting can be used as the liner sheet; adding insulation to single skin roofs.
Labour intensive compared to a Composite Panel as each layer, spacer, insulation is installed individually. Care must be taken to ensure the system is air sealed at ridge & eaves.
INSULATED / COMPOSITE PANEL SHEETING
These are factory produced insulated panels which perform in a similar way to a twin skin system; the metal sheeting liner & top sheets are separated by just a solid bonded insulation core. Various core depths are available to achieve a range of thermal performance (‘U’ value)
Speed of installation as you are only laying one layer; thermal performance is guaranteed, no air leakage issues. Made to order in exact length required.
Can be more expensive than a Built up insulated system; not really suitable for over roofing existing sheeting. Made to order leads to longer lead times.
HOW ITS DONE
- The first sheet laid onto of purlins (Purlins provide horizontal support for the sheets and form part of the framework) perpendicular to the eaves with 50 –75mm overhang at eaves.
- Screw into place as per recommended locations
- Apply adhesive tape along the top and side where the next sheet will overlap.
- Place the next sheet on top of the previous sheet ensuring an overlap of 150 –200mm overlap.
- Screw into place and apply adhesive tape as before.
- The next sheet is placed on top of both sheet one and two effectively sandwiching them.
- Repeat the process as before.
- Repeat the process until complete.
If you are interested in a sheeting project or have any question please contact our Industrial Sheeting Team who can provide technical support quotations and on site visits where required.
Please note this is only a general guide always consult manufacturers’ literature before installing