How To Install a Velux Centre-Pivot Roof Window - Part 3

  JJ Roofing Supplies
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In this part of the installation, Mark shows how to fit the transverse drainage gutter, and the completed installation of the BDX insulation collar. Fixing it to the frame and battens and providing added protection to the roof window.

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How To Install a Velux Centre-Pivot Roof Window - Part 3
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