What VELUX Flashing Do I Need?

Whether you're buying a new or replacement VELUX roof window, choosing the correct VELUX flashing is essential. The right flashing ensures a secure and seamless fit, a weathertight seal, and long-term protection from the elements - and there's no need to worry, working out what you need is simpler than it sounds.

To choose the correct VELUX flashing, you'll need to know:

What type of material you have on your roof
The pitch (or slope) of your roof
Whether you require a standard or recessed installation
What additional extras you might need for optimising energy efficiency

At Roof Giant, our VELUX flashing kits are designed to match perfectly with your roofing material, creating a secure, weathertight connection between the window and the roof. This guide explains the most important flashing information to help ensure a smooth and successful installation.

Work out what roof type you have...

Just like VELUX roof windows, flashing kits are designed to correspond to the pitch of your roof. VELUX offers different flashing options for tile roofs and slate roofs, as well as plain tile flashing and special head flashings for other roofing substrates. Work out what you need below:

EAW Flashing – 'Mini dormer effect' for 10°–75° low-pitch tile roofs

The EAW 'mini dormer solution' is designed for installing VELUX roof windows into low-pitch tiled roofs with profiled coverings up to 120mm. It lifts the VELUX window up and positions it at a steeper angle to improve water runoff, making it suitable where the existing roof pitch would otherwise be unsuitable for a standard flashing installation.

EDW Flashing – for 15°–90° pitched tile roofs

Designed for profiled tile roofs up to 120mm in profile, EDW flashing kits are suitable for flat and profiled roofing materials, including interlocking tiles and slates. The minimum recommended roof pitch for this flashing is 15°.

Watch the VELUX EDW Flashing Installation Video Guide

EDL Flashing – for 15°–90° pitched slate roofs

VELUX EDL flashing kits are designed for installing VELUX roof windows into pitched roofs covered with flat, non-interlocking slates up to 8mm thick. If you are working with thicker or interlocking slates, or any profiled roofing material, VELUX recommends using the EDW flashing kit instead.

Watch the VELUX EDL Flashing Installation Video Guide

EDP Flashing – for 25°–90° pitched plain tile roofs

The VELUX EDP flashing kit is designed for installing VELUX roof windows into pitched roofs covered with plain tiles. It is suitable for roof pitches no lower than 25° and no higher than 90°, and can be used with plain tiles measuring up to 300mm in length and with a maximum thickness of 14mm. The EDP flashing kit ensures correct tile overlap and provides a secure, weathertight installation when fitting roof windows into traditional plain tile roofing.

ZWC Frame Covering Set – for installations without standard VELUX flashing

The ZWC frame covering set is used when a VELUX roof window is installed without a standard VELUX flashing kit, typically in bespoke roof constructions where standard flashings cannot be used (e.g. zinc, lead, membrane, GRP, or other non-standard roof coverings).

The set provides frame cover profiles for the sides and bottom of the window, together with a specially designed top hood intended to overlap site-formed weathering. ZWC does not provide weatherproofing on its own and does not replace a standard flashing kit. A suitable on-site flashing or weathering system must be designed and installed separately to ensure a fully weathertight installation.

The ZWC frame covering set is intended for bespoke pitched roof installations and must be detailed correctly in accordance with good roofing practice.

Important: ZWC cannot be combined with GTU, GTL, VIU or VFE window types.

Other VELUX Flashing Options (Specialist Roof Types)

As well as standard tile, slate and plain tile flashings, VELUX also manufactures a range of specialist flashing kits designed for non-traditional roof coverings. These VELUX flashings are typically used on modern homes, extensions and commercial buildings, where standard domestic flashings are not suitable.

EDT Flashing – for 15°–90° flat interlocking tile roofs

VELUX EDT flashing kits are designed for installing VELUX roof windows into pitched roofs covered with flat interlocking tiles. Due to the shape and interlocking design of these tiles, standard profiled tile flashings are not suitable. EDT flashings provide the correct detailing to ensure effective water runoff and a secure, weathertight installation on roof pitches from 15° to 90°.

EDR Flashing – for 0°–15° felt, membrane & bitumen roofs

VELUX EDR flashing kits are used for installing roof windows into roofs covered with felt, bitumen or membrane roofing systems. Commonly used on extensions and warm roof constructions, this flashing allows the roofing membrane to be dressed up and sealed to the window frame, creating a durable and weatherproof finish where tiles or slates are not present.

EDQ Flashing – for 15°–90° standing seam metal roofs

EDQ flashing kits are specifically designed for standing seam metal roofs, including zinc, aluminium and steel systems. It enables VELUX roof windows to be installed without cutting or penetrating the metal seams, helping maintain the integrity of the roof covering. EDQ flashings are widely used on contemporary residential and architect-designed buildings.

EDE Flashing – for 15°–90° profiled metal sheet roofs

VELUX EDE flashings are suitable for profiled metal sheet roofing, such as corrugated and box profile sheets. These roof coverings are typically found on agricultural, industrial and light commercial buildings. EDE flashing bridges the metal profile to ensure a secure, weathertight connection between the roof window and the roof covering.

Do you need standard or recessed flashing?

You can choose to install your VELUX roof window in either a standard or recessed installation, which requires different flashing kits to achieve the desired finish. Recessed flashing kits are used when you want a cleaner, more elegant appearance, as the window is installed approximately 40mm lower than standard, allowing it to blend more seamlessly into the roofline.

EDJ – Tile – Recessed Flashing Kit

For tiled roofs with a minimum pitch of 20° and a maximum pitch of 90°, and tile profiles up to 90mm thick, an EDJ recessed flashing kit allows the window to be installed lower into the roofline, creating a sleek and integrated finish.

EDN – Slate – Recessed Flashing Kit

For slate roofs with a minimum pitch of 20° and a maximum pitch of 90°, the EDN recessed flashing kit is suitable for flat, non-interlocking slates up to 8mm thick.

Standard Flashing Kits

For standard tile and slate installations, Roof Giant offers a wide range of different VELUX flashing kits, including EDW flashing for tiled roofs, EDL flashing for flat slate roofs, and EDP flashing for plain tiles, in multiple sizes to suit your roof window.

How many windows are you planning to install?

The type of flashing you need may also depend on the number of windows you're planning to install. At Roof Giant, we offer a range of different VELUX flashing options to suit the number, position and arrangement of windows on your specific roofing material.

Twin Flashing

This standard flashing option allows two VELUX roof windows to be installed side-by-side with an 18mm gap. Twin flashing kits are available as EBL for slate roofs, EBW for tiled roofs, and EBP for plain tile roofs, depending on your roofing material.

Recessed Duo Flashing

Recessed duo flashing is designed for installing two roof windows side-by-side at a recessed installation depth, creating a cleaner, more integrated appearance. These VELUX flashing kits allow for a 100mm gap between windows and are available for slate roofs (EKN) and tiled roofs (EKJ).

Coupled Flashing

Coupled flashing is designed for installing two roof windows next to each other with a 100mm gap at standard installation depth. This flashing type is available for slate roofs up to 8mm thick (EKL), plain tile roofs up to 14mm thick (EKP), and profiled tiled roofs with profiles up to 120mm (EKW).

Triple Window Flashing

Triple window flashing allows three VELUX roof windows to be installed side by side with a 100mm gap. These flashing kits are available for slate roofs (EKL), plain tile roofs (EKP) and tiled roofs (EKW) to suit your roofing material.

Extras to consider

VELUX offers optional accessories that can be installed alongside your flashing to improve thermal performance and installation quality.

Insulation, Underfelt & Vapour Barrier Collars

The VELUX insulation collar (BDX), underfelt collar (BFX) and vapour barrier collar (BBX) are designed to address common roof window installation issues such as heat loss, air leakage and condensation risk.

The insulation collar helps reduce heat loss and cold bridging around the window frame.
The underfelt collar provides a secure, weathertight connection between the roof window and the roofing underlay.
The vapour barrier collar creates an airtight seal between the roof window and the internal vapour control layer, helping to prevent moisture from entering the roof structure.

Used together, these accessories help improve energy efficiency and ensure a professional, long-lasting installation.

Roof pitch ranges are provided as a general guide. Please check the individual product specification to ensure the flashing is suitable for your roof construction and covering.