Crowns

The crowns (light band base) can be made of various materials. The dimensions of the crowns are standard and adjusted to the dimensions of the light bands. The heights of the standard crowns are 15, 30 or 50 cm. The manufacture of crowns of non-standard heights and sizes is possible on special order.

Polyester crowns

They are made of polyester, reinforced with glass fibres. The heat insulation is assured by the rigid polyurethane foam, inserted between the two polyester layers. The inner side of the crown is white and smooth. The composite part of the crown is the flange, fixing the light band to the roof.

Standard sizes:
The measures of the crowns, as K and O, are given in the table of standard sizes of the acrylic light bands.

Metal crowns

They are made of the galvanized (painted) metal sheet. The heat insulation is assured by the glass or rock wool, inserted into the metal base. Thus prepared base shall be rimmed with the steel sheet, bitumen, or the PVC foil (dependent on the type of the roof).

The metal crowns are manufactured in the same standard sizes as the polyester ones (K and O measure in the table of standard acrylic light band sizes), however, the principal advantage of the metal crowns is that the latter can be manufactured in any size without any additional costs for the fabrication of moulds, and can thus be adjusted to any (also to the non-standard) building opening. The metal crowns can be manufactured also in the non-standard heights.

Standard sizes:
The standard sizes of the metal crowns are the same as the standard sizes of the polyester ones.
The measures of the crowns, as K and O, are given in the table of standard sizes of the acrylic light bands.

Wooden crowns

The wooden crowns are rarely used due to the poorer resistance of wood to weather conditions. Their advantage is especially low price and simple fitting.