Logical Installation


Free phone consultation to discuss options.

Sub-construction

An accurate sub-construction precedes a trouble-free installation


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To achieve a trouble-free installation process the sub-construction needs to accommodate the unique module installation system. VELUX Modular Skylights require an accurate fixed dimensioned substructure.

Likewise the strength of the subconstruction needs to be calculated from project to project, based on the building design and application size. Hence the sub-construction is not part of the prefabricated modular system.

Three Material Options:

1Lumber

sub-construction-lumber

Lumber remains the most flexible choice for creating a light and economical subconstruction with maximum energy performance. Due to its limited strength lumber is not recommended for larger solutions and ridgelight installations.

2Steel

sub-construction-steel

Steel offers flexibility in combination with great strength. Steel also permits the application to be installed with the maximum amount of insulation.

3Concrete

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Concrete provides a strong, but heavy subconstruction, mostly suited for concrete buildings. Whereas a wood or steel sub-construction can be prefabricated and hoisted onto the roof, concrete upstands are usually cast in-situ.

A logical delivery

A modular delivery speeds up your workflow.


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To achieve a trouble-free installation process the sub-construction needs to accommodate the unique module installation system. VELUX Modular Skylights require an accurate fixed dimensioned substructure.

Quick and easy installation

Plug and play installation saves time and resources.


Prefabricated modules allow for a quick and easy installation in all weather conditions. The logical delivery system saves time on-site and lets you seal buildings quickly and safely.

Free detailed email consultation with price ranges for options.

• Design/Build • Repair-Replace-Retrofit • Consulting