J-3 "Translucent Sheets :
1. Translucent sheeting and dome lights shall be of glass fibre-reinforced polyester resin of self-extinguishing quality and with a resin-rich external surface to prevent ageing.
The local authorities or the Principal shall approve the fire-retardant grade if no local regulations exist.
Materials that emit very toxic substances or excessive smoke in a fire shall not be used.
Profiled translucent sheeting shall be of the same profile as the adjacent standard types of wall cladding and/or roofing sheets.
2. Number, area or sizes shall be restricted to a minimum.
3. No more than 20 % of the wall surface shall be fitted with translucent sheeting, due to smoke development in the case of fire.
4. To prevent condensation and to restrict solar heat load inside the building, double-skin dome roof lights shall be applied. The shape shall be square or rectangular.
5. The fire-retardant grade.
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