{"id":24,"date":"2012-08-18T13:50:48","date_gmt":"2012-08-18T13:50:48","guid":{"rendered":"https:\/\/www.roofing-materials.com.au\/?page_id=24"},"modified":"2026-04-30T10:45:43","modified_gmt":"2026-04-29T23:45:43","slug":"roof-installation-best-practice","status":"publish","type":"page","link":"https:\/\/www.roofing-materials.com.au\/index.php\/roof-installation-best-practice\/","title":{"rendered":"Installation Roof Supplies – Best Practice"},"content":{"rendered":"

Correct roof installation of an asphalt shingle system<\/h2>\n

Successful roof installation<\/strong> requires\u00a0a little knowledge and planning which one can find in this guide.\u00a0 It is important to learn how to correctly install asphalt shingles.<\/p>\n

Follow the steps below and\u00a0you will have a roofing system that will outperform most other roofs, easily outlasting the warranty period.\u00a0 Failure to follow any of the roof installation measures below may cause your materials to start to deteriorate before the Warranty period.<\/p>\n

For a worry-free roof read this guide and of course ring and speak to one of our roof installation team<\/a> with any questions you have.<\/p>\n

Rafters<\/h3>\n

We generally start with the trusses \u201crafters\u201d spaced at 600mm centres.<\/p>\n

If rafters are at 900mm centres you will need to use 17mm plywood in 2700mm x 1200mm sheets as per Australian standards.<\/p><\/blockquote>\n

Before we install the plywood we need to perform a few simple things.\u00a0 The centre valley line needs to be nogged to stop any movement in the plywood.\u00a0 If the ply can move in the valley the shingle roof tiles or rubber membrane can rip and water can enter.<\/p>\n

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Valley nogged to support plywood<\/figcaption><\/figure>\n

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The ridge needs to be nogged 100mm back from the apex.\u00a0 This gives the plywood something strong to attach to and also provides support to the ridge ventilation and capping tiles.<\/p>\n

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Noggin on either side of ridge<\/figcaption><\/figure>\n

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Pay special attention to the leading edge of the plywood above the fascia board.\u00a0 This is where we achieve “Inlet Ventilation” around the entire perimeter.<\/p>\n

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Fascia detail – How to create inlet ventilation<\/figcaption><\/figure>\n

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10mm air gap between bottom edge of plywood and top of fascia<\/figcaption><\/figure>\n

There are other methods for installing asphalt shingles at the fascia in bush fire zones. Call one of our staff for advise.<\/p>\n

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The section near the barge is detailed in the picture below.<\/p>\n

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\"Shingle
Barge detail – protect water entry at barge edge with a metal flashing<\/figcaption><\/figure>\n

The Plywood<\/h3>\n

A shingle roof installation uses “Australian Made”<\/strong> 12mm A-Bond Tongue & Groove Structural Plywood \u2013 stamped (AS\/NZS 2269).<\/p>\n

I stress “Australian Made” because there are imported plywood’s that are stamped AS\/NZS 2269 that are not seasoned in our country.\u00a0 Most imported plywood will equalize to our moisture conditions and may shrink, buckle and warp \u2013 when this happens you will need to replace the entire system (ply and shingles).\u00a0 You only make this mistake once :)<\/strong><\/p><\/blockquote>\n

To install Plywood you will need to follow the manufacturers roof installation<\/strong> guidelines but generally speaking, 70mm long shank framing nails spaced every 150mm will suffice.\u00a0 This is also suitable in high wind zone areas.\u00a0 It is important to use tongue and groove plywood as it provides the stability needed under the felt paper and shingles.\u00a0 The tongue and groove edge should\u00a0 be butted together tight with the short vertical edge needing a 2mm gap for any expansion in the wood.<\/p>\n

\u00a0 \u00a0 \u00a0We then staple down #15 Asphalt Saturated Felt Paper – holding it in place.\u00a0 We overlap 50mm on the horizontal joins and 100mm on the vertical joins.\u00a0 Between 8.5 degrees and 18.5 degrees pitch we either use a double layer of felt paper or Rubberized adhesive membrane to cover the plywood.<\/p><\/blockquote>\n

On low pitches (between 8.5\u00b0 – 15 degrees) we generally use an adhesive rubberized membrane material.\u00a0 This is because the water doesn’t flow down the slope as easily – wind-driven rain can flow up the slope and under the shingles.<\/p><\/blockquote>\n

Asphalt saturated felt underlay is a 920mm wide felt paper with a coating of asphalt saturant.<\/p>\n

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<\/a><\/p>\n

Asphalt Saturated Felt Underlay<\/strong><\/h4>\n