VELUX Window Installers › Aberdare › Guide
Adding a roof window to a house that already has a finished roof is one of the most common jobs we do. It is not simply a hole with a window dropped in. In an Aberdare terrace, the age of the roof, the type of covering and the framing in the loft all shape how the work goes.
What the loft tells us
We start inside the roof space, because the structure decides the opening. Rafter spacing, their size and condition, and any purlins or ties in the way all matter. Most Victorian and Edwardian roofs in Aberdare have sound, deep timbers, which is a good starting point.
Where the window position crosses a rafter, the timber is trimmed and the load carried by doubled rafters either side. We confirm that on site, never from a drawing alone. If a timber is cracked, rotten or notched badly, we say so, and quote the strengthening as part of the work rather than discovering it halfway through the day.
The roof covering and the flashing kit
Roof windows need a flashing kit that matches the covering. Natural slate, imitation slate, plain tiles and profiled concrete tiles all need different kits, and the wrong one will not seal. Many Aberdare roofs have been re-covered at some point, so the covering is not always what the house suggests.
We check this from the ground and from the loft before we order anything. If the covering turns out to be a mix of old and new, we explain how the flashing will be dressed, and what that means for the finished look.
- Slate and imitation slate need a slate-profile kit.
- Plain tiles need a kit that sits flush with the small lap.
- Profiled concrete tiles need a kit matched to the profile depth.
- Mixed or patched roofs may need extra work around the opening.
Pitch, headroom and position
A roof window works best on a good pitch, and Aberdare's steep terrace roofs usually provide one. Position affects headroom, the view, and how well the window lights the room. We set it with you inside the loft, standing where the bed or desk will be.
On a shared roof run, we also pay attention to where neighbouring chimneys and party walls sit, so the window stays clear of them. Chimney breasts and party-wall upstands limit where an opening can go, and in a terrace the layout of the neighbouring roof can matter too.
Insulation, lining and finish
Once the window is in, the opening is lined and insulated, with a vapour control layer so warm damp air does not reach cold timber. Without that, the frame can show condensation even when the flashing is perfect. That keeps the room dry.
A good finish inside is part of the job. We aim to leave the room tidy and usable, with plaster or lining boards formed neatly around the reveal. We also check how the new window sits against the ceiling line, because awkward angles are easier to resolve while the lining is still open and accessible.
- Insulation around the frame and in the reveals.
- Vapour control layer to keep damp air out of the timbers.
- Neat lining boards or plasterboard around the opening.
- Check for gaps that could cause draughts.
Permissions and the next step
A roof window may need planning or Building Regulations checks, and we advise before work starts. Those checks vary with the house and what is being done inside. We will tell you what applies to your house when we have seen it, so that nothing is a surprise later in the job.
Do not go on the roof to measure up. Tell us roughly where you want the window and we will look from the ground and the loft, then explain what is involved. We can then give you a clear written quote for the whole job.
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More Guides for Aberdare
Common Questions
Do all roofs suit a roof window?
Most pitched roofs do, but not all. Very shallow pitches, damaged framing or unusual coverings can complicate things. We look at the roof and loft first and tell you plainly what is possible and what would need extra work.
How big a window can I fit?
Size depends on the rafter spacing and where you want the window. Standard sizes fit between or across rafters with trimming. We discuss options on site, and aim for the largest window the structure will sensibly allow without over-complicating the work.
Will it make a mess inside?
Cutting the opening creates dust and debris, so we protect the floor and furniture and clear up as we go. We open the roof only as far as needed, and weather it quickly, so the house is not left exposed.
Get a Quote in Aberdare
Tell us what the roof is doing in Aberdare and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.