Installation products

Every roof installation job requires skill and experience as well as the right tools and materials.

The VELUX installation product system is designed and optimised to support the installation workflow.

By using the complete VELUX installation product system, you can achieve the best possible results.

Installation products

Every roof installation job requires skill and experience as well as the right tools and materials. The VELUX process is designed and optimised to support your workflow so you can achieve the best possible results.

The VELUX installation product system

  • Fit exact window dimensions and connect perfectly to your roofing material. Underfelt collar (type BFX) and insulation collar (BDX) are included with the flashing.

  • Pleated underfelt collar (type BFX) forms a tight seal between roof window and your felt underlay. Comes with adjustable drainage gutter to lead water away from the head of the roof window.

  • Insulation collar (type BDX), with flexible foam for a tight and secure fit to the roof construction.

  • Vapour barrier collar (type BBX), including assembly tool for a vapour- and airtight solution.

  • Prefabricated linings (type LSB/LSC/LSD) for easy and airtight inside completion. Includes vapour barrier collar (type BBX).

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Original VELUX
Flashings
 Underfelt collar BFX
 Water drainage
gutter
 Insulation frame
BDX
 Vapour barrier
collar BBX
 Interior lining
LSB / LSC / LSD
 Lining frame
kit LSG
Fit exact window
dimensions and
connect perfectly
to your roofing material
 Pleated underfelt
collar forms a
tight seal between
roofwindow and
your felt underlay.
 Self-supporting
drainage gutter
ensures safe
water drainage
from above the
window.
 Insulation frame
with flexible foam for a tight and secure fit to the roof construction.
 Vapour barrier
collar, including assembly tool for a vapour- and airtight solution.
 Prefabricated linings
for easy and airtight inside completion. Includes vapour
barrier collar.
 Easy-to-assem­ble,
adjustable steel
frame for fast and
easy framing for
your on-site lining. Includes vapour
barrier collar.
 

Installation levels

VELUX roof windows offer two installation heights, standard or recessed.

Recessed flashings provide a sleek and streamlined finish as the roof window is installed 40mm deeper into the roof structure, meaning that less of the roof window protrudes above the roofline.

Roof window installed on a pitched roof
 Standard installation
Roof window installed recessed on a pitched roof
 Recessed installation

Standard installation

Flashings on a window installed on a roof

Single installation: EDW
Combi installation: EBW/EKW

  • For standard installation of roof windows in flat or profiled roofing material up to 120mm in profile
  • Also for interlocking slate, thatch and profiled sheeting
  • Suitable for 15°-90° roof pitches
Flashings on a window installed on a roof

Single installation: EDL
Combi Installation: EBL/EKL

  • For standard installation of roof windows into slate up to 8mm thick
  • Not for interlocking slate
  • Suitable for 15°-90° roof pitches

Single installation: EDT

  • For standard installation of roof windows in flat tiles with
    15-40mm thickness
  • Suitable for 20°-90° roof pitches

Single installation: EDP
Combi Installation: EBP/EKP

  • For standard installation of roof windows in plain tiles up to 14mm thick (max length 300mm)
  • Suitable for 25°-90° roof pitches

Recessed installation

Flashings on a window installed on a roof

Single installation: EDJ
Combi installation: EKJ

  • For recessed installation of roof windows into flat or profiled roofing material up to 90mm in profile
  • Suitable for 20°-90°


Flashings on a window installed on a roof

Single installation: EDN
Combi installation: EKN

  • For recessed installation into slate up to 8mm thick
  • Not for interlocking slate
  • Suitable for 20°-90° roof pitches

Combine VELUX roof windows with solar panels

The specially designed flashing system perfectly connects VELUX roof windows to in-roof solar panels from a variety of manufacturers. Our solution ensures that your roof window will fit perfectly into the solar panel grid with and easy safe and seamless integration. In this way, the roof is used optimally for generating solar energy while offering a comfortable living space with daylight and fresh air under the roof.

ODL

Flashing sets for a flawless installation

Our flashing sets contain everything you need for the best possible installation result.

Choose the Pro+ flashing set that includes the BDX insulation frame and BFX underfelt collar for a weatherproof installation and to reduce heat loss and thermal bridges.

Pro+ flashing set

(2000 variant)

A flashing set with added insulation

Insulation frame BDX contributes to the reduction of heat loss and thermal bridges.

Available for single and combination installation.

Flashing

Underfelt collar BFX

Insulation frame BDX

Pro flashing set

(1000 variant)

 A flashing set for all weather conditions

Extra security against water penetration. 

Available for single installation.

Flashing

Underfelt collar BFX

Insulation frame and underfelt collar

The insulation frame BDX insulates around the roof window frame, reducing heat loss and eliminating cold bridges. The combination of rigid and flexible foam ensures a tight, energy-efficient installation to the roof construction.

The flexible insulation frame can be compressed for quick installation.

The underfelt collar BFX ensures a perfect fit and watertight seal between the roof window, battens, and the roofing underfelt. It is easy to fit. Simply place on top of the roof window and unfold.

An adjustable and self-supporting drainage gutter is included in the BFX. This leads the water away from the head of the roof window if there is a leak above.

Insulation frame BDX
Underfelt collar BFX

Vapour and airtight installation

Use the VELUX  vapour barrier collar BBX for a vapour and airtight installation that prevents  condensation forming in the roof construction. The vapour barrier collar fits perfectly and can easily be mounted  into the groove of the window.

Interior lining

If you want a ready-made solution to complete the interior finish in the room, VELUX linings are easy to install and there is no need for additional painting. Made from durable PVC material, VELUX linings are water-resistant and maintenance-free and fit perfectly with the roof window.
The unique design allows space for extra insulation material to prevent cold bridges.

VELUX linings are delivered with VELUX vapour barrier collar BBX.

Combination of roof windows

The combination system

The system consists of seven elements that enable your chosen combination.

The a-distance:

  • EKW, EKL: flexibility between 100-160 mm (M) with the new adjustable middle gutter
  • EKP, EKN, EKJ: 100 mm (E)
  • Other frame distances between 60 mm to 400 mm can be specially ordered

The b-distance:

  • Standard frame distance 100 mm (E)
  • When installing a roller shutter, a frame distance of 250 mm (J) is needed

The VELUX Adjustable middle gutter


Our innovative and patented solution makes roof window combination installations more straightforward.

The middle gutter can be adjusted to widths between 100 - 160 mm (M width), ensuring that it always fits to the actual rafter dimensions.

The VELUX Adjustable middle gutter is included in the VELUX Pro+ combination flashing set. When ordering, look for the letter M at the end of the product code – this means the VELUX Adjustable middle gutter, insulation collars and underfelt collars are included. For example: EKW MK06 2021M for a side-by-side combination.

Learn more about our adjustable middle gutter