Description
Where the Deepest Anthracite Over Sill Earns Its Projection
The over sill anthracite 2.5m 220mm depth is the deepest of the four anthracite projections stocked by Renders World, listed at £30.40 in August 2026, and it carries an existing sill outward across a thick insulated build. It sits at the deep end of the window sill extensions and over sills range, alongside the same four depths in white.
The job of any anthracite window sill extension is to take the drip edge past the new finished face, so rainwater leaves the wall instead of tracking back behind the profile. Depth is therefore a measurement decision taken against the finished build, not against the board thickness alone.
- Deep added build-ups: where insulation, adhesive, basecoat and finish together push the wall face well clear of the original masonry line.
- Dark trim schemes: where the window frames, rainwater goods or fascia line already run in a dark colour and the sill is to match.
- Whole-elevation consistency: where one projection is wanted across every opening so the trim line reads level from end to end.
Why Installers Choose the Deepest Anthracite Profile
- Deepest projection in the range: at 220 mm it is the furthest-reaching of the four anthracite depths, which is what a thick build-up needs to keep the drip edge proud of the finish.
- 2.5 m in one piece: a single length covers most domestic openings without an intermediate joint, and a joint is more visible on a deep trim than on a shallow one.
- 2.0 kg per length: light enough that several profiles travel inside the small-parcel band rather than needing a pallet, which keeps carriage proportionate on a small order.
- Colour costs nothing extra: anthracite and white are priced identically depth for depth at £30.40 for the 220 mm, so the trim line is a design choice with no commercial penalty.
What This Page States About the Profile, and What It Confirms on Ordering
Every figure below was read live this session. No manufacturer document for these profiles could be retrieved by pointer, by page or by search, so the properties that depend on one are named as open rather than filled in — a specifier is better served by the gap than by a number with nothing behind it.
| Property | What this session read |
|---|---|
| Projection (depth) | 220 mm, from the product name and live title |
| Length | 2.5 m, single profile |
| Colour | Anthracite |
| Weight | 2.0 kg per length, product endpoint, August 2026 |
| Price | £30.40, August 2026, no VAT treatment displayed |
| Stock at fetch | Out of stock, August 2026 |
| Material and coating type | Not published — no manufacturer document retrievable |
| Insulation depth band | Not published — use the measuring method below |
| Fixing centres and fall angle | Confirmed on ordering |
| Minimum drip projection | Confirmed on ordering |
| End cap pairing | Confirmed on ordering |
How to Fit the Profile Into the Render Sequence
Fitting sits inside the render programme rather than before or after it, and the order of work is what makes a deep profile read level across an elevation.
- Fix the insulation first, so the profile lands on a bonded and mechanically fixed board face rather than on a substrate that will still move.
- Measure each opening separately, since reveal widths on older housing vary along one elevation and a single template carried across a wall fits poorly somewhere.
- Cut with a fine-toothed blade and deburr the edge, so an end cap seats without being forced onto a rough cut.
- Set an outward fall so the profile drains forward, clear of the wall, instead of letting water track back toward the substrate.
- Bed the rear upstand in one continuous run of sealant, not intermittent dabs — an uninterrupted line is the detail that keeps driven rain out at the frame junction.
- Return the basecoat and mesh up to the profile edge, which locks the trim into the reinforced layer before the decorative finish goes on.
Fitting Notes for a Deep Projection
A deep trim rewards a little more setting-out than a shallow one, because at this projection small variations between openings are visible from the pavement.
- Work to a datum across the elevation: a string line or laser between the first and last opening, set before the intermediate profiles go on, is what makes the finished line read as one level.
- Check the fall before the fixings pull tight: a level held at the front edge takes seconds, and adjusting a profile after it is drawn down onto a sealant bed is the fiddlier of the two jobs.
- Where a profile arrives with a protective film, leave it on through basecoat and topcoat and peel it once the render has cured, which keeps cementitious splash off the visible face.
Fixing centres, fall angle and the overlap behind the profile are real specification questions that belong to a manufacturer document this session could not obtain, so they are settled with the technical desk at the point of order. The sill extension fitting guide works through measuring and cutting in sequence, and the reveal and opening detailing guide places the profile alongside the beads at the same openings.
Choosing Between the Four Anthracite Depths
All four anthracite profiles share the 2.5 m length and differ on projection, so depth, price and stock are the honest comparison. Every figure below was read from the individual product endpoints in August 2026 and is material cost only.
| Profile | Price, August 2026 | Stock at fetch |
|---|---|---|
| 110 mm anthracite over sill | £20.90 | Available |
| 140 mm anthracite over sill | £23.90 | Available |
| 170 mm anthracite over sill | £27.90 | Available |
| 220 mm depth, this profile | £30.40 | Out of stock |
The four depths span £30.40 − £20.90 = £9.50 end to end, and the step from the 170 mm up to this profile is £30.40 − £27.90 = £2.50, the smallest gap in the range. Two things follow for a buyer. Stepping up a depth costs very little, so a borderline build is worth resolving on the geometry rather than on the price; and with this profile showing out of stock at the time of the fetch, the 170 mm is the deepest anthracite over sill actually available, which is worth a call before an elevation is specified around 220 mm.
Ordering, Stock and Getting the Profile to Site
At £30.40 for the 2.5 m length in August 2026, with no VAT treatment shown beside the figure, the price covers the profile alone. End caps are a separate line, ordered one pair per continuous run in the matching colour, and the pairing is confirmed by the desk when the order is placed.
Renders World processes orders the same day where stock is available, and delivery is costed after the order rather than at checkout, because profile lengths and pallet weights vary too widely for an automatic calculation. These figures are site-wide policy rather than anything specific to this profile.
- Small parcels to 25 kg move next-day by courier, with a two-business-day economy option. At 2.0 kg per length, 25 kg ÷ 2.0 kg = 12 profiles inside that band.
- Pallets to 1200 kg travel on the same next-day or economy choice, wrapped but not weatherproof, so they need covering on arrival.
- Free local van delivery runs to 15 miles of the Southampton base on orders over £300, with £1.50 per additional mile beyond that to a limit of 60 miles.
- All deliveries are curbside, so plan for moving 2.5 m lengths from the roadside to the scaffold.
Is the Deepest Anthracite Profile the Right Call Here?
- Genuinely deep build-ups, dark trim line: the widest drip margin of the four, and the profile to specify once the desk has confirmed the geometry against your build.
- Lighter builds: the 140 mm anthracite over sill at £23.90 avoids projecting further than a thin build needs.
- Available today: the 170 mm anthracite over sill at £27.90 showed in stock this session, £2.50 below this one.
- The rest of the opening: specify render stop beads at the jamb terminations and render corner beads at the external angles so the whole detail reads as one line.
- The finish over the top: the coat that closes the detail comes from the thin-coat silicone render range.
FAQ — Quantities, Depth, Caps, Stock and Care
How many profiles and caps does one opening need?
One 2.5 m length covers most domestic openings in a single piece, and one cap pair closes that run at both ends. Count caps by runs rather than by windows: a bay built from three separate sections takes three pairs, while one wide opening formed from a single profile takes one.
Why is no insulation thickness stated for this depth?
A depth-to-build mapping rests on a manufacturer's stated minimum drip projection, and no document carrying that figure could be retrieved this session. The bands previously published across these four pages also disagreed with one another, so the measuring method plus a desk confirmation replaces them: measure the total added build outward from the original masonry face, counting insulation, adhesive, basecoat and finish, then send that figure to the technical desk with the render system you intend to use.
Do the anthracite caps suit this profile?
Caps are supplied colour-matched, so an anthracite run takes anthracite caps, and the pair is listed in the over sills and verge trims collection. Cap-to-profile fit is confirmed at the point of order, since no manufacturer compatibility document for these profiles was obtainable.
The page shows out of stock — what are the options?
Two routes are open. The customer service team advises restocking times on any out-of-stock line at the point of enquiry, and the 170 mm anthracite profile was available at £27.90 this session, £2.50 less, which suits many builds once the geometry is checked.
How is the profile looked after once the render is finished?
Periodic rinsing with clean water to clear airborne deposits covers it, avoiding solvents and abrasive pads. Keeping cementitious runoff off the face during the build pays off most, since marking on a trim face usually comes from render residue rather than from the finish itself.