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Joints and board connections

ROCKPANEL board material retains its shape as it is able to withstand dampness and changes in temperature. This allows it to be used seamlessly under certain conditions:

  • Only for use around the roof, such as to finish guttering, for fascia boards and rooflines
  • Up to a maximum length of 15 metres
  • A timber sub-frame is used with vertical slats to prevent the sub-frame from warping
  • The sub-frame timber is protected by using gaskets on the sub-frame for all joints
  • Dilation joints are used throughout the ROCKPANEL construction

The following guidelines for joints and board connections apply when installing the boards:

  • ROCKPANEL is dimensionally stable, and therefore resistant to changes in length and width. When constructing keep in mind that other materials expand or contract to varying degrees compared to ROCKPANEL boards.
  • Boards, assembly and building tolerances play an important role in the joint detail. Take this into account.
  • Apply weather-resistant joint tape to the seams to protect the back construction against weather influences. In horizontal use of ROCKPANEL Lines, horizontal seams are automatically covered by the overlying strip and no additional finishing of the seam is necessary.
  • The joints should be such that sufficient ventilation and/or drainage is ensured in order to prevent damage as a result of retained moisture.

Joints and board connections ROCKPANEL Lines²

In horizontal use of ROCKPANEL Lines², horizontal seams are automatically covered by the overlaid board and no additional finishing of the seam is necessary. On vertical framework, weather-resistant joint tape should be applied to protect the framework. ROCKPANEL recommends to maintain a 3 mm joint between the panels.

When using the clip to fix Lines² S 8 and Lines² XL 8, protection of the timber battens with weather-resistant joint tape isn’t necessary. In this case, the timber battens should be in accordance with BS 5268-2 : 2002 and preservative treated in accordance with BS 5268-5 : 1989 and BS 8417 : 2003.

With Lines² installed in a demountable fashion, each panel can be secured horizontally and vertically. Even when the panels are secured they still can be replaced individually. If horizontal secured fixing is used, automatically a small vertical joint will be applied between the panels.

The dimensions of the timber battens should be at least 34 x 70 mm at the joints and 34 x 45 mm at intermediate supports (minimum thickness 28 mm).

In panel joints and seams, take account of the following.

  • ROCKPANEL is dimensionally stable and therefore resistant to changes in length and width. When constructing keep in mind that other materials can expand.
  • Boards assembly and building tolerances play an important role in the joint detail.

Corner solutions ROCKPANEL Lines²


Profile D

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(Lines² S 10 / Lines² XL 10)
ROCKWOOL Ltd
ROCKPANEL Group

Wern Tarw
Pencoed Bridgend
CF35 6NY
Tel.: +44 (1656) 863 210
Fax: +44 (1656) 863 611
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Rockpanel board material for facade cladding and roof detailing
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