VELUX Window Installers › Penarth › Guide
Fitting roof windows for a loft conversion is more than cutting a hole and dropping a window in. In Penarth, where many houses have tall roof spaces ideal for bedrooms and studies, the work runs from checking the timbers through to flashing, lining and insulation. Here is what the stages involve, in the order they happen.
Looking at the roof space first
We begin in the loft, looking at the rafters, the pitch and the roof covering. A room needs enough headroom and enough window area to be useful, so we talk about where light is needed. On older villas the timbers may show age or past repairs, and we note anything that has to be dealt with before cutting.
Structure around the opening
Cutting an opening in the slope often means cutting a rafter. The timbers around the opening are trimmed and doubled-up so the load is carried properly, with details checked on site. This is the stage that makes the window secure, and it is not something to rush or skip. A good fit depends on a sound frame, so on older Penarth villas we also look at the condition of the surrounding timbers and battens, which may need replacing.
- Rafters trimmed where the opening requires it
- Doubled-up timbers to carry the load
- Battens set out to suit the window frame
- Details confirmed on site, not guessed
Flashing and weatherproofing
The window needs a flashing kit matched to the roof covering, whether slate on a Victorian villa or tile on a later house. Slates or tiles are cut and lapped into the flashing so water runs over and away from the frame. Most leaks around roof windows come from poor flashing or sealing, so this is the stage we take most care over. Slates are cut and lapped one course at a time, and every joint is checked before the next goes on.
Lining, insulation and vapour control
Inside, the opening is lined to give a neat reveal and insulated so the room does not lose heat through the window surround. A vapour control layer helps stop moisture getting into the structure and causing condensation. These parts are hidden once the plasterboard goes up, which is exactly why they need doing properly the first time. Rooms in a coastal town can be damp, and a window reveal without a good seal is where condensation shows first.
- Insulation around the frame and reveals
- Vapour control layer sealed to the frame
- Lining set at the right angle for light
Finishing and what to ask
Finally the inside is finished, the window checked for opening and closing and the roof tidied. Ask what flashing kit is being used, how the rafters are being treated and what the plan is for the opening if rain arrives. A loft conversion may need planning or Building Regulations checks — we advise before work starts.
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Common Questions
Can you fit roof windows without a full loft conversion?
Yes. Many people just want light in a loft they use for storage or a small room. The same care applies to flashing, framing and lining, and we explain what each stage involves when we visit and look at the roof.
How many roof windows will my loft need?
It depends on the size of the room, the roof pitch and how you plan to use the space. We look at the loft and suggest the number and positions that give good light without weakening the roof structure or spoiling the look from the street.
Will a roof window leak in heavy rain?
A properly flashed and sealed window should not. Leaks are nearly always down to flashing, sealing or the covering around the window. That is why we match the kit to your roof and check the surroundings carefully.
Get a Quote in Penarth
Tell us what the roof is doing in Penarth and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.