This is a step by step article on how to install your velux integra electric window.  Let’s start at the beginning with unboxing.


Check the box and make sure the specifications of the window suits your needs.  Note the QR code on the front of the box, this will lead you to some useful installation videos.  Velux boxes are designed to be opened without a knife (ensuring no  damage to the contents), just follow the directions on the reverse of the box on how to easily pull it apart in a couple of motions.  Inside you’ll find clear instructions on how to install.  To reduce packaging, the ventilation bar is packed unclipped, you can clip this back in by removing the polystyrene and lifting the bar up with both hands.  The remote control unit can be placed to one side for now.  You can now open the window and remove the frame from the sash - watch the supplied video if you’re not sure exactly how to do this.  You can pop the sash to one side for now.

2. Fitting The Brackets

There are two lines; red and blue, these signify the installation heights for your frame.  Follow the guidelines depending on how your window will be installed.  Once you’ve found the correct placing for your brackets, screw them into place.

3.  Preparing The Roof Opening

Always install the window above the lower installation baton and above a complete row of tiles.  You need an 80mm gap from the top of the tiles to the lower baton, this allows the window to be dressed properly.  The upper installation baton needs a tolerance of 45mm giving you 1025mm as per the instructions.  Width wise you should give yourself 30mm either side, a total of 840mm.  Cut the membrane to make way for your window, excess can be stapled neatly to the batons.

4. Fitting Insulation

It’s important with any roof installation that the window is insulated to match the rest of the roof.  The Velux BDX is purposely made for this in terms of its dimensions.  Inside the box is the underfelt collar, the insulation on this is the maximum recommended and you can either peel off insulation layers to suit your measurements, or it will simply compress too.  The sides slot together easily using the built-in locking mechanisms.  Once assembled, you have an insulation frame designed perfectly for the window.  The insulation can now be placed inside the outer frame bottom first and manipulated into place - you do want a snug fit so just manoeuvre until it fits nicely.  The frame of the window can now be passed through the window and placed in, bottom first.  The cable for the mains power should be inside.

5.  Securing The Window To The Frame

You can now secure the window frame using the brackets you’ve already fitted and the screws provided.  Part fix the top screws, make sure everything is level, and then secure completely.  Feed the sash through the window and secure to the barrel bolt.  You can now flip the window into place.  Check the gap and seal is even.

6. Fitting The Underfelt Collar

The underfelt collar is made of a breathable membrane which sits around the window, this should fit quite snugly.  It will stick down quite easily. Excess membrane will slip beneath the batons.  The batons can then be secured into place.  On the sides, the pleats fit neatly around the batons to which the membrane can be stapled.

7.  Fitting The Drainage Gutter

Secure the drainage gutter above the window with the kit provided, folding the membrane over it and using the clips.

8. Installing The Flashings

The flashings are all numbered inside the box.  The apron is flexible and will mould around the window.  The bottom frame cover will sit in place until you screw it in. Work your way around the window attaching and securing the side flashings.  The final flashing will sit at the top of the window.  Don’t forget to remove the little red cover which protects the rain sensor!

All you need to do now is fit your tiles around the window and connect the window to your power supply.  The handy settings booklet is in picture form and should be easy for you to follow the set up procedures for your window.  Everything you need for your remote control is included; fixtures, fittings, and batteries.