Installation advice

We think it is relatively easy to install our roof windows as everything can be done from inside the property, however, ease of installation will always depend on your specific circumstances. Before you start the installation, there are a list of things that you need to take into consideration:

  • Are you installing your roof window into a new building?
  • Is this new build without a covered roof and without finished masonry?
  • Is it an established or inhabited house?
  • Does the roof have modern tiles or have you got a 100 year old slate roof?

We have organised these assembly instructions so that you can find exactly the right sections you need for your roof quickly. But should you have any concerns, you should seek the advice and assistance of a professional roofer because incorrect roofing and building work can affect the stability of the roof.

We can also advise you about the way to attach a snow guard to your roof window to avoid possible damage from snow.

Choose your product first:


Roof windows installation sequences

Fixing a tile flashing

Prepare tools

Shaping tiles

Depending on the height of the tiles and proximity to the base of the window, it is sometimes necessary (with profiled tiles) to shape the tiles underneath the window to allow the corrugated apron to sit down correctly.


Cutting tiles

Measure out the desired cut point and use an angle grinder to chamfer the edges.

Marking out

Replace tiles

Replace the bottom course of tiles.

Pilot hole

Install bottom flashing

Fix the bottom flashing section to the frame. Using your hands, press and smooth the apron to the contours of the tiles. If necessary, a rubber mallet may be used carefully to shape the apron.

Locate rafters
Rafter edge

Fit bottom cover

Fit the bottom window cover part.

Removing insulation

Fit side flashing

Fit the side flashing sections. Make sure the side flashing section fits in the bottom section. Pin to the side of the frame.

Removing a rafter

Secure side flashing

Fasten the flashing side parts to the battens using the clips provided.

Removing a rafter

Fit side covers

Fit side cover parts.

Removing a rafter

Fit sash cover

Fit sash upper cover parts.

Removing a rafter

Fit top cover

Fit top cover part.

Removing a rafter

Fix top flashing

Fix the top flashing section. It should sit tightly over the existing top window cover part.

Removing a rafter

Replace tiles to the side

Replace the tiles up the side. We recommend that you slit the foam slightly, immediately above each tile. This prevents there being a gap where the tile steps up.

Removing a rafter
Removing a rafter

Ensure tiles fit

You are likely to need to cut the tiles on one side of the frame to ensure a perfect fit. But make sure the gap is within the recommended tolerances (30-60 mm).

Removing a rafter

Replace top tiles

Replace top row of tiles. It may be necessary to cut the tiles for a perfect fit. Maintain the recommended tolerance between the tiles and the frame (60-150 mm).

Removing a rafter

Position the roof window

Position the sash into frame. Make sure you support the frame firmly before positioning the hinge arms into the locking mechanism.

Flat tiles should have a gap of 0-40 mm to the frame. Profiled tiles should have a gap of 60-80 mm to the frame.

Removing a rafter

Job done

That's it! You have now installed your roof window.

Secure top flashing.

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