Velux GGU INTEGRA Uživatelský manuál stáhnout pdf (Strana 101)

Building physics

VELUX 101

Bearing construction

Sometimes the wish for a special VELUX solution requires adjust-

ment of the roof construction in order to create sucient space.

The need for such changes may have a deterrent eect on both

customers and installers, but often the problems are not so big if

the entire installation is thoroughly planned from the start.

Old roof constructions are often based on tradition and experience.

Changes to these roof constructions are therefore made on the

basis of traditional craftsmanship and experience with a fair share

of reason and caution.

In new roof constructions where the bearing elements are often

factory-made, the construction systems and materials have been

optimised on the basis of calculations. Any change/weakening of

the bearing system in these roof constructions may impair the con-

struction beyond calculated permissible safety limits. Factory-made

rafters are most often marked with manufacturer identiﬁcation

and it is recommended to seek advice from the manufacturer or a

structural engineer before making changes in such constructions.

The extra time and materials required to make a correct structural

change are relatively moderate considering that the roof construc-

tion is already accessible.

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Velux GGU INTEGRA Uživatelský manuál Strana 101