How To Install LYSAGHT FLATDEK® II roofing

This page contains contains tips for the installation of LYSAGHT FLATDEK® II sheeting. For more detail on general roofing installation please see Install LYSAGHT® Steel Roofing & Walling

Fasteners

  Fixing to steel up to 0.75 mm BMT Fixing to steel 1 to 3 mm BMT Fixing to timber
Standard fixing Self Drilling, self Tapping screws with hex. washer head & EPDM washer
10-12 x 20mm
Self Drilling, self Tapping screws with hex. washer head & EPDM washer
10-16 x 16mm

Self Drilling, long shank wood screws with hex. washer head & EPDM washer
SOFTWOOD:
10-12 x 30mm
HARDWOOD: 10-12 x 20mm

Higher weather-tightness

Self Drilling, self Tapping screws with hex. washer head
16mm x 0.9mm aluminium / EPDM bonded washer
12-11 x 25mm

Self Drilling, self Tapping screws with hex. washer head
16mm x 0.9mm aluminium / EPDM bonded washer
12-14 x 20mm

Self Drilling, long shank screws with hex. washer head
16mm x 0.9mm aluminium / EPDM bonded washer
SOFTWOOD & HARDWOOD: 12-11 x 40mm

When fixing to LYSAGHT FIRMLOK™, tighten until washer is just gripped enough to give a weathertight seal. Don't tighten any more.

Fastener Location

LYSAGHT FLATDEK® II Fastening Frequency

Supports: 2 fasteners per sheet

LYSAGHT FLATDEK® How to Install Figure 1 awning

A receiver channel is usually used to securely fix the LYSAGHT FLATDEK® II roof to the main building-usually to the building fascia, but the channel can be fixed to a solid wall if there is sufficient height.

Laying LYSAGHT FLATDEK® II: Introduction

Laying of LYSAGHT FLATDEK® is easy. Lay sheets towards the prevailing wind. Before you join sheets, it is important to remove the protective plastic coating otherwise the sheets won't clip together properly. Be careful to place the sheets on a soft surface to prevent scratching.

Laying LYSAGHT FLATDEK® II: Procedure

Insert the closed-cell foam strip into the receiver channel.

Push the first sheet firmly into the receiver channel, with the flat-topped rib on the edge of the roof.

  • Fix the sheet at the beam end. Tighten screws until washer is just gripped enough to give a weathertight seal. Don't tighten anymore.
  • Squeeze a closed-cell foam insert into the receiver channel and massage it to fit neatly all round.
  • Fix the sheet at the receiver channel end.

Place the next sheet with its rib on top of the rib of the first sheet, and the house-end close to the receiver channel. Engage the ribs for the first 100 mm as shown in the image to the left.

With a rubber mallet, tap the sheet into the receiver channel ensuring the sheet beds firmly in the foam strip. Complete engaging the ribs (as in figure above). Check that the sheet fits snugly against the previous sheet by looking at the join between the sheets on the underside. Fix the sheet as previously described. Repeat the process until all sheets are laid.

Fibreglass Panels

LYSAGHT FLATDEK® II can be complemented with translucent fibreglass panels. The edges of these panels overlap the adjoining LYSAGHT FLATDEK® II panels. Two fibreglass panels cannot be laid next to each other. Slide fibreglass panels along the LYSAGHT FLATDEK® into the receiver channel.

Pipe Penetration

Flashing around small pipe penetrations is fairly simple using flanged sleeves or proprietary EPDM sleeves. Be careful to insulate incompatible materials.

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 eachother; 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.

Sealants

Use neutral cure silicone sealants.

Adverse Conditions

If this product is to be used in marine, severe industrial, or unusually corrosive environments, contact us.

Metal and Timber Compatibility

Lead, copper, bare steel and green or some chemically treated timber are not compatible with this product; thus 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, ask for advice from our information line.


 
BlueScope Steel Limited
ABN 16 000 011 058
BlueScope and Lysaght
are trademarks of BlueScope Steel Limited
Australian Made Lysaght