Roof windows are a fantastic way to bring light and ventilation into a building. Whether you’re a roofer, window installer or builder, if you’ve recently bought a roof window you’ll want to know how to install it correctly.
The following instructions are best applied to Dakea roof windows. If you have an alternative brand of window, many of these instructions will still apply – but it’s advisable to seek specific advice for your brand of window to ensure the best installation.
For specific installation instructions, download the installation manual for your new Dakea roof window: installation manuals.
Each roof window might require specific installation instructions different from other Dakea windows. We recommend viewing the installation instructions for your specific window for the most accurate installation instructions. These are supplied with every window, and are available in our installation manuals. View our guide on roof window types.
For a general window installation guide, view our installation video or read the corresponding written instructions below.
Please note that these instructions are designed to provide additional guidance for professionals, not homeowners. We always recommend homeowners hire a reliable and experienced roof window installer.
Approximate time: 1.5-4 hours*
*Depending on whether you’re just installing the window and flashing (approx. 90 minutes), or whether you also need to cut the hole and do the internal finishing work (approx. 4 hours).
Remember to wait until a dry day to install your window. Otherwise, you might end up with a wet attic or moisture trapped within the insulation.
Be sure to select the right roof window for your requirements. At Dakea, we have roof windows in a range of designs and sizes, including PVC windows, pitched roof windows and flat roof windows. If you’re replacing an existing window, make sure you get the correct size!
Before deciding on your size and style of the roof window, however, you should check the structural integrity of the roof. As a general rule of thumb, homes constructed after 1960 have factory-built roof trusses. A structural engineer will need to check these before you install the roof window.
Your window will be delivered to your site. At Dakea, we have a fully trackable system so you know when to expect your window.
Once delivered, your Key Account will contact you with the necessary info and will offer any further assistance should you need it. Read more about the delivery logistics on our housebuilders page.
Your window will arrive in a secure box and will need unboxing.
Always check the box for damage before you open it. If the box packaging is torn or broken, let the delivery driver know right away or call your Key Account contact as soon as possible.
Ensure all the parts of the window are in the box. Check the instructions and lay all parts out, identifying them so you can know you have all you need for installation.
If you’re not installing your window immediately, it should be stored in the standing (vertical) position so that the corner label on the box faces up (not upside down). If you take the roof window out of the box for any reason, it’s important that it is not stored separately, without the packaging. The roof window is only balanced when in the box.
The new roof window will come with the necessary fixtures for installation, with flashing available separately (as it needs to be specific to the roof type).
Want to know more about flashing? Read our blog: what is skylight flashing?
With both the roof and the window prepared, you can install your roof window.
Flashing is essential for ensuring the new window installation is waterproof.
View our video on how to install slate flashing (KSF).
Finally, you need to complete gaps in the roof tiles.
Your roof window installation is complete!
Flat roof windows are installed in pitches between 5-15°. Any less than 5°, water is likely to pool on the window, leading to leaks or damage.
If you have any questions about your installation, call our UK customer services team on: (+44) 20 3970 5080