VELUX Window Installers › Tonypandy › Guide
A roof window looks like a simple choice of size, but where it goes and how big it is affect the rafters, the flashing, the view and the light. In a Tonypandy terrace loft, with party walls and stacks close by, the options are narrower than many people expect. This is how we work it out.
Start with what you want the room to do
A bedroom, a study and a landing all need different things. A bedroom may want a view when sitting up, while a study wants steady light on a desk. We ask how the loft will be used before looking at sizes, because the answer shapes everything that follows, from height off the floor to how many windows suit the slope. Ask us if you are unsure and we will talk it through in plain terms.
Rafter spacing sets the limits
The window sits between rafters, and the rafters either side of the opening are trimmed and doubled-up to carry the load. The spacing in your roof therefore decides which sizes are easy and which need more structural work. In older terraces the spacing is not always regular, so we measure it in the loft rather than relying on a standard window width. If anything on site changes the plan, we tell you before carrying on.
- Check rafter spacing from inside the loft
- Pick a width that fits with little trimming
- Allow for doubling-up either side
- Confirm any extra structural work on site
Head height and where people stand
On a steep Tonypandy roof there is usually good height, but the sloping ceiling still limits where you can stand. A window set too high is hard to open and clean, and one set too low is blocked by the room's furniture. We aim for the window to sit where it can be reached comfortably and gives a view when you are seated or standing near it.
Party walls, stacks and neighbours
Terraced houses share walls, and the chimney stacks often run along them. The window cannot sit against a party wall or stack without upsetting the flashing and the structure, so we leave sensible space. We also think about the view across to neighbours' windows, and which direction the slope faces, as that affects light and warmth in the room.
Flashing and the roof covering
Every window needs a flashing kit matched to the roof covering, whether slate or tile. The size and position you choose must leave room for that flashing to work properly with the courses around it. A window that lines up neatly with the tile courses is easier to flash and less likely to leak, so position can be nudged slightly to suit. This may need planning or Building Regulations checks, and we advise before work starts.
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Common Questions
Is bigger always better for a roof window?
Not always. A bigger window needs more rafter work and a larger flashing, and may be harder to open and clean. We suggest the size that gives the light you need without overcomplicating the structure.
Can I put a window anywhere on the slope?
Not quite anywhere. Rafters, party walls, stacks and the tile courses all limit the position. We check these from the loft and the ground and suggest the best spot within them. We explain each stage of the work before the first tile is lifted.
Should I visit before choosing a size?
It helps. A look in the loft tells us the rafter spacing and height, which decide what is practical, and we can talk through what you want from the room before you commit to anything.
Get a Quote in Tonypandy
Tell us what the roof is doing in Tonypandy and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.