Felt Roof Shingle Installation Guide – Icopal Bitumen Roofing Shingles

Roof Shingle Installation - Roof Preparation

Icopal roof shingles are easy to install over an underlay if necessary.

Shingles are butt jointed with a tongue and groove end profile, overlapped as work progresses up the roof.


On existing roofs the existing roof waterproofing must be removed and disposed of safely.

Check the roof for adequate fixing and flush board joints, ensure there are no steps or hollows in the roof deck.

Replace any damaged or rotten sections of the roof deck or structure.

Ensure all nail/fixings heads are well driven to avoid puncturing the waterproofing.

Applying the Underlay

It is recommended that an underlay of Anderson 3B Glass Base Layer or Monarflex Protect is applied on roofs with a pitch between 15º and 45º.

Above 45º the underlay is not required unless the building is in an exposed location.

Starting at the eaves and working up the roof slope the underlay is applied parallel to the eaves line.

Fix into position with large headed galvanised clout nails ensuring the underlay is flat to the roof deck, overhangs the roof edges and is turned down.

Allow 75mm side laps and 100mm end laps in the underlay and secure by nailing.

At the roof ridge the underlay should extend above the ridge and be turned down the opposite roof slope a minimum of 100mm and nailed.

The underlay should also extend beyond valley and hips in a similar fashion.

Repeat the process for all sloping areas of the roof.


Other roof shingles installation guide topics

Applying the Roof Shingle Strip to Eaves and Verges

Using Bitumen Roofing Shingles to Waterproof Valley Sections

Application of Roofing Shingles to the Main Roof Areas

Application of Roofing Shingle to the Ridge

Using Bitumen Roofing Shingles to Waterproof Hip Sections 

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