Install LYSAGHT INTEGRITY® 820 cladding

This page contains basic instructions for the installation of LYSAGHT INTEGRITY® 820 Cladding. For more information see Install LYSAGHT® Steel Roofing & Walling.

Please be aware that installation of steel cladding must be carried out by licensed tradespeople in some Australian states.

Fastening sheets to supports

LYSAGHT INTEGRITY® 820 Cladding must be crest fixed to timber or steel supports.

Do not locate fasteners less than 25 mm from ends of sheets.

Fastening Details - LYSAGHT INTEGRITY® 820 Crest Fixed

Fixing to Steel up to 1 mm thick	Fixing to Steel 1 mm to 3 mm thick
Hex Head, Self Drilling Tapping screw for timber with seal and LYSAGHT INTEGRITY® sealing plate 12-11x65	Hex Head, Self Drilling Tapping screw with seal and LYSAGHT INTEGRITY® sealing plate 12-14x68

Metal and Timber Compatibility

Lead, copper, bare steel and green or some chemically-treated timber are not compatible with this product. Don't allow any contact of the product with those materials, nor discharge of rainwater from them onto the product. Supporting members should be coated to avoid problems with underside condensation. If there are doubts about the compatibility of other products being used, Contact Us.

Maintenance

Optimum product life will be achieved if all external walls are washed regularly. Areas not cleaned by natural rainfall (such as the tops of walls sheltered by caves) should be washed down every six months.

Storage and Handling

Keep the product dry and clear of the ground. If stacked or bundled product becomes wet for extended periods, separate it, wipe it with a clean cloth and stack it to dry thoroughly. Handle materials carefully to avoid damage: don't drag materials over rough surfaces or each other; carry tools, don't drag them; protect from swarf.

Cutting

For cutting thin metal on site, we recommend a circular saw with a metal- cutting blade because it produces fewer damaging hot metal particles and leaves less resultant burr than does a carborundum disc. Cut materials over the ground and not over other materials. Sweep all metallic swarf and other debris from roof areas and gutters at the end of each day and at the completion of the installation. Failure to do so can lead to surface staining when the metal particles rust.

Sealed Joints

For sealed joints use screws or rivets and neutral-cure silicone sealant branded as suitable for use with galvanised or ZINCALUME® steel.

Fixing Sheets to Supports

LYSAGHT INTEGRITY® 820 is pierce-fixed to steel supports. This means that fastener screws pass through the sheeting. To achieve the unique watertightness of LYSAGHT INTEGRITY® 820, always place roof screws through the crests using the special LYSAGHT INTEGRITY® 820 sealing plate. Always drive the screws perpendicular to the sheeting. Don't place fasteners less than 25 mm from the ends of sheets.

End Lapping

End-laps are not usually necessary because LYSAGHT INTEGRITY® 820 is available in long lengths. If end-laps are used, complete each run of sheets from gutter to ridge, before placing the next run. For roofs, maximum and minimum end-laps are detailed on our website.

Ends of Sheets

It is usual to allow roof sheets to overlap into gutters by about 50 mm. For roof pitches less than 25 degrees, the pans of sheets at gutter ends and ridge ends must be turned-down and turned-up respectively.

Laying Procedure

 

For maximum weather-tightness, start laying sheets from the end of the building that will be in the lee of the worst-anticipated or prevailing weather.

It is much easier and safer to turn sheets on the ground than up on the roof. Before lifting sheets on to the roof, check that they are the correct way up, and the overlapping side is towards the edge of the roof from which installation will start.

Place bundles of sheets over or near firm supports, not at mid span of roof members.

Fixing

The rib where a screw is to go must be free from moisture and debris. LYSAGHT INTEGRITY® 820 sealing plates are self-adhesive. Peel the backing off a LYSAGHT INTEGRITY® 820 sealing plate, and place the plate on the rib. Dispose of the backing in an environmentally friendly way.

Drive the roofing screw through the hole in the sealing plate, using an electric screwdriver. Make sure the torque setting is adjusted to leave just a fine gap between the head of the washer-face and the top of the sealing plate.