Velux GGU INTEGRA Instrukcja Użytkownika Pobierz pdf (Strona 108)

Building physics

108 VELUX

25 cm

Y + 20 cm

X + 20 cm

25 cm

Sound insulation

In buildings sound spreads from room to room and from the outside

to the inside in two dierent ways; partly as airborne sound where

air pressure waves spread through crevices in the constructions

and partly as structural sound that is transmitted via vibrations in

solid materials.

The airborne sound can be reduced by carefully sealing crevices in

the construction. Structural sound can be diminished by separating

the constructions or by using high density building materials.

If there are special demands to sound insulation when installing a

VELUX roof window, roof window GGL in the special sound insulat-

ing variant --62 can be used. The construction of this variant has

been optimised with regards to sound insulation and the insulating

glass unit has an additional 8 mm layer of glass.

In addition to this, the installation must be carried out so that the

connection between the window and the roof construction ensures

eective sound insulation.

This may be ensured by:

• tting inll battens along the window frame (a),

• tting strips of heavy bituminous roong felt under the underfelt

collar (b) and

• sealing connections through which airborne sound may pass (c).

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Velux GGU INTEGRA Instrukcja Użytkownika Strona 108