202-INST-US-001 v1.0
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11 Dec 2020
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Page 9 of 25
Preparation of the Roof
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Sunken Installation
Typically for cold-roof construction with thin roofing materials, such as slate
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the product will sit on the outside of a separate frame
sunken below the outside level of the rafters.
Sales drawings:
Installation: 202-ASS-003
Fixing dimensions: 202-ASS-001
Figure B
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Example of sunken installation
Study the sales drawings of the product carefully when designing the size of the main aperture and secondary sunken frame. Figure B is
for illustrative purposes only and may not be suitable for your installation.
These products can be very heavy. Glazing Vision strongly recommends that a structural engineer is consulted when
designing the structure(s) that will support the product and the surrounding roof. Nothing in this manual constitutes a
structural proposal.
Before continuing onto the installation instructions:
The sunken frame that will support the product, and the surrounding rafters and horizontal trimmers, should be
complete and in place.
The surrounding roof should not yet be felted or battened, this will be covered in the installation instructions.
Secondary frame
sunken below the
level of the rafters
Product to sit on face
of sunken frame
Secondary fillet
