Description
Renders World lists this profile as the second of four anthracite over sill depths, and everything below is either read live this session or named as an omission. The profile belongs to the window sill extensions and over sills range, alongside its matched verge trims and end caps.
Where the 140 mm Anthracite Over Sill Sits on a Rendered Wall
The over sill anthracite 2.5m 140mm depth profile carries a window's drip edge out beyond a newly rendered wall face, priced at £23.90 per 2.5 m length as at August 2026. Insulating and rendering an elevation pushes the finished face past the original masonry sill, and an over sill restores the shed line across each opening.
Within the anthracite range this is the second depth of four, one step up from the shallowest. That position is genuinely useful — it is the depth most often reached for on light-to-moderate build-ups — and it is also where the depth call is worth checking rather than assuming, since the profile sits close to the middle of the range rather than at either safe end.
- Certain from the range itself: four anthracite depths at 110 mm, 140 mm, 170 mm and 220 mm, each on a 2.5 m length.
- Read live this session: the price above, and stock showing as available at the time of the fetch.
- Confirmed on ordering: profile geometry and depth against your own build-up, checked by the technical desk against current stock.
Why Installers Order Matched Anthracite Profiles Together
The case for a matched profile rather than a generic one is practical, and it holds at every depth in the range.
- One piece per opening: a 2.5 m length spans most domestic window widths without a joint, and a joint in a trim face shows more on a dark finish than on a pale one.
- Continuity across the elevation: anthracite reads as a single line only where sills, verge trims and caps come from the same colour family, so specifying them in one order is the straightforward route.
- Caps pair to their own trim: the anthracite cap pair closes an anthracite run, and caps are colour-specific — a mismatched cap shows at the most visible point of the detail.
- Colour costs nothing: the white and anthracite profiles are priced identically at this depth, so the trim colour follows the window frames and fascia rather than the budget.
- One counter, one order: profiles, trims and caps come from the same trade desk, which closes every opening on an elevation in a single transaction.
Checking the 140 mm Depth Against Your Own Build-Up
Depth is chosen against the finished wall rather than the insulation alone. Measure the total added build outward from the original masonry face — board thickness, adhesive, the reinforced basecoat and the decorative finish — then take a depth that projects past that finished face rather than stopping level with it. The method is sound and needs no document behind it.
What this page will not publish is a depth-per-insulation-thickness chart. The previous version of the over sill anthracite 2.5m 140mm depth page carried two different bands for this one profile — 70–90 mm in its body copy and 90–120 mm in its own meta description — and a minimum drip projection is a manufacturer figure rather than something derivable on site. No document for these profiles was retrievable this session by pointer, page or search. The over sills and verge trims collection takes the same position, so the two pages now agree.
- Send the build-up to the desk: board type, thickness and the render system going over it are enough to confirm the depth against current profile geometry.
- Measure the cured basecoat, not the drawing: as-installed build-ups drift from specified ones, and the finished face is what the drip edge has to clear.
- Measure each opening separately: reveal depths on older housing vary along one elevation, so a single template carried across a wall fits poorly somewhere.
- Where the call is borderline, the step up to the next depth is £4.00, which makes the deeper profile an easy decision once the desk has confirmed the geometry.
How to Fit the Profile Into the Render Sequence
Sequence is what makes these profiles read as one continuous line, and it belongs inside the render programme rather than before or after it. Fixing centres, fall angle and the sealant specification are all real questions that sit in a manufacturer document this session could not obtain, so they are confirmed on ordering rather than stated here.
- Fit after the boards, before the reinforced layer: the profile goes on once insulation is bonded and fixed, so basecoat and mesh return up to its edge and lock it into the system.
- Set an outward fall: the profile drains forward, clear of the wall, rather than letting water track back toward the substrate.
- Bed the rear upstand in one continuous run of sealant rather than intermittent dabs — an uninterrupted line is what keeps driven rain out at the frame junction.
- Cut with a fine-toothed blade and deburr, so an end cap seats without being forced onto a rough edge.
- Leave any protective film in place through basecoat and topcoat and peel it once the render has cured, which keeps cementitious splash off the visible face.
- Work to a datum across the elevation: a string line or laser between the first and last opening before the intermediate profiles go on is what makes the finished line read as one level, and it costs minutes.
The sill extension fitting guide works through measuring and cutting in order, and the reveal and opening detailing guide sets this profile alongside the beads at the same openings — render stop beads at jamb terminations and render corner beads at external angles. The finish going over the whole detail comes from the thin-coat silicone render range.
The Four Anthracite Depths and What They Cost
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 product's own page 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 depth, this profile | £23.90 | Available |
| 170 mm anthracite over sill | £27.90 | Available |
| 220 mm anthracite over sill | £30.40 | Out of stock |
The four depths span £30.40 − £20.90 = £6.50 end to end, and the steps between adjacent depths are small: £3.00 from 110 mm to 140 mm and £4.00 from 140 mm to 170 mm. A depth decision is therefore a technical one rather than a commercial one, which is worth knowing before the desk call.
What It Costs and How It Reaches Site
At £23.90 for the 2.5 m length in August 2026, no VAT treatment was displayed alongside the figure. The price covers the profile alone: end caps are a separate line, one pair per continuous run, in matching anthracite.
Renders World processes orders the same day where stock is available, and delivery is priced after the order rather than at checkout, because profile lengths and pallet weights vary too widely to calculate automatically. Small parcels up to 25 kg and pallets up to 1200 kg both move next-day by courier, with a two-business-day economy option, and all deliveries are curbside. Free local van delivery runs to 15 miles of the Southampton base above the order value stated in the shipping policy, with a per-mile charge beyond that to a limit of 60 miles.
Is the 140 mm Depth the Right Call Here?
Four points settle it, and the last is the fastest route to certainty.
- Moderate build, dark trim line: the second depth of four suits a light-to-moderate added build-up where the scheme calls for anthracite.
- Lighter builds: the 110 mm anthracite over sill at £20.90 avoids projecting further than a thin build needs.
- Deeper or exposed elevations: step up to the 170 mm anthracite over sill, in stock at £27.90, where the finished face sits further out or the wall faces the weather.
- Not certain yet: send the build-up to the technical desk and order the confirmed depth with its matching cap pair in one go — the £4.00 spread between depths means little rides on the guess.
FAQ — Quantities, Caps, Depth Bands 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.
Do the anthracite caps suit this depth?
Caps are supplied colour-matched and pair to their own trim, so an anthracite run takes anthracite caps. Cap-to-depth fit is confirmed by the desk at the point of order, since no manufacturer compatibility document for these profiles could be obtained this session.
Why does this page no longer state an insulation thickness?
Because the two figures previously published for this profile disagreed with each other — 70–90 mm in the body against 90–120 mm in the page's own description — and a depth-to-build mapping rests on a manufacturer's stated minimum drip projection that no available document carries. The measuring method plus a desk confirmation is a firmer answer than either band was.
Is the 170 mm profile the safer specification?
On a deeper build or a weather-facing elevation it usually is, and at £4.00 more it is an inexpensive margin to buy. On a genuinely light build the deeper profile projects further than the wall needs, which is why the desk check is worth the call rather than defaulting either way.
How is the profile looked after once rendering 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 the finish itself.