OVER SILL WHITE 2.5m 220mm DEPTH

The 220 mm is the deepest of four projections in the white oversill line, sitting one step above the 170 mm on a shared 2.5 m length. It belongs to the white and anthracite oversill and verge trim collection at Renders World, alongside the matched end caps and the anthracite profiles at the same four depths.

What the Over Sill White 2.5m 220mm Depth Does on a Rendered Wall

The Over sill white 2.5m 220mm depth is listed by Renders World at £30.40 for a 2.5 m length, August 2026, and carries the drip edge of a window sill outward once insulation and render have closed over the original one. Its function is water management: rain leaves the opening at the front edge rather than tracking back down the new render face.

Depth is the whole decision on this product, and 220 mm is the figure the listing fixes exactly. How far the projection needs to reach past the finished wall is a project figure, taken from the measured build-up and the system supplier's sill detail, so the comparison below ranks the four depths on price and step size rather than assigning each an insulation band.

• Top of a four-step ladder: the deepest white projection stocked, and the end of the range rather than a step toward a deeper one.
• Only £2.50 above the 170 mm: the narrowest step in the whole range, which is why a build-up sitting near the limit of the 170 mm is usually better served here.
• £9.50 above the shallowest profile: the full span of the range, across 110 mm of extra projection.
• One 2.5 m length per opening: a single length across the opening keeps the deep trim face free of an intermediate joint, which shows more at this projection than at any other in the range.
• Stock-tracked and available: the store record counts inventory on this depth, so the counter can confirm quantity before a multi-window order.
• Matched white end caps listed at £5.90: the white sill and verge end cap pair is a stocked line, August 2026, not a special order.

White Oversill Specification: What Was Sourced and What Was Not

This audit publishes only what was read live this session. The published page asserted a material, a coating, an insulation band, a drip projection, a fall angle, fixing centres, a service life and a delivery restriction, none of which had a retrievable source; each is now removed or replaced by the route to a firm answer.

Property	Position, August 2026
Listed title	OVER SILL WHITE 2.5m 220mm DEPTH
Colour	White
Projection, from the product name	220 mm — deepest in the white range
Length, from the product name	2.5 m
Price	£30.40 per profile, product record, August 2026; no VAT treatment displayed with the figure
Availability	Available and stock-tracked in the store record
Material, coating and gauge	Not published — no manufacturer sheet was retrievable this session
Insulation build accommodated	Not published — a manufacturer and project figure, not a house figure
Drip projection past the render face	Not published — comes from the system supplier's sill detail
Fall angle, fixing centres and wind loading	Not published — taken from that detail and the project's exposure assessment
End caps	Separate item, white pair, £5.90, August 2026
Delivery	Site-wide policy: courier, pallet or company van, kerbside, carriage confirmed after the order

 

Three Renders World pages now give this depth three different insulation bands — 140–200 mm here, 90–120 mm on the 140 mm page's table, and a fourth figure on the anthracite equivalent — with no supplier document reachable to settle any of them, so none is republished. The instruction that does hold is short: measure adhesive, board, basecoat and finish on the wall, then send that figure and the elevation's exposure to the technical desk, which produces a defensible depth in one call.

How to Install the 220 mm Oversill Within the Render Sequence

Fitting an oversill is a sequencing job before it is a fixing job, and this order keeps the water path continuous and the visible face clean.

1. Confirm the depth against the wall, since measured board and render thickness on site can differ from what the drawing specified.
2. Set an outward fall before fixing, so water drains off the front edge rather than standing on the profile or working back toward the substrate.
3. Bed the rear upstand in a continuous low-modulus silicone line against the original sill — one uninterrupted bead, not spots, is the watertight detail, and a break behind a deep profile puts water straight onto the insulation.
4. Fix mechanically along the upstand at the centres the system detail gives for the build-up in use, and raise exposure with the specifier on this profile, since the deepest projection in a range is the one where wind loading is worth confirming rather than assuming.
5. Leave 2–3 mm clearance at each cut end so the cap seats without being forced, then deburr the cut edge before sealing.
6. Close both ends with the white cap pair and tool the joint, finishing and sealing each cut end in one action.
7. Where the profile arrives with a protective film, leave it on through basecoat and topcoat and peel it once the render has cured; cementitious splash is far easier to prevent than to lift off a pale finish.

One habit specific to this depth: a deep profile forced into a reveal a millimetre or two narrow bows visibly across its front edge, where the same error at 110 mm hides. That makes the end clearance less of a nicety here and more the thing that protects the trim line. The oversill is one junction in a wider reveal treatment, with jamb terminations handled by stop bead profiles and external arris points by corner bead profiles. For the order of work in full, the window sill extension fitting guide covers measuring and cap closure, and the guide to render detailing at windows and doors covers how the profiles around an opening coordinate.

Choosing Between the Four White Depths and What the Step Costs

All four share the 2.5 m length, the white finish and the same end cap pair, so depth and price are the only variables. Every figure was read from the product records in August 2026, is material cost only, and carried no displayed VAT treatment.

Profile	Depth	Price, Aug 2026	Step from this depth
110 mm white oversill	110 mm — shallowest	£20.90	−£9.50
140 mm white oversill	140 mm	£23.90	−£6.50
170 mm white oversill	170 mm	£27.90	−£2.50
Over sill white 2.5m 220mm depth (this profile)	220 mm — deepest	£30.40	—

 

The pricing is not evenly spaced, and that is the useful observation for anyone ordering across a facade. The steps run £3.00, then £4.00, then £2.50, so the jump from 170 mm to 220 mm buys 50 mm of extra projection for the least money in the range. On this profile the rate is £30.40 ÷ 2.5 m = £12.16 per linear metre, against £11.16 for the 170 mm — a difference of £1.00 per metre for the deepest trim available.

Working Out Quantities, Caps and Carriage Before Ordering

Oversills are counted by continuous runs rather than by windows, and the caps are the item most often left off an order sheet.

• One profile plus one cap pair per run: £30.40 + £5.90 = £36.30 in materials for a single opening, before sealant and fixings.
• Count caps by runs, not by openings: a bay made from three sections takes three pairs; one window closed by one length takes one.
• Cap price is independent of depth: the same £5.90 pair closes a 110 mm or a 220 mm run, so a mixed-depth elevation still costs one pair per run.
• Check load space before a collection run: at 2.5 m these are the longest profiles in the collection and a multi-window job reaches a dozen lengths quickly, so confirm capacity before the trip rather than at the counter.
• Confirm cap seating on this depth with the desk, since no manufacturer document for the pairing was retrievable this session.
• Carriage is quoted, not calculated: the Renders World shipping policy covers courier despatch for small parcels up to 25 kg next day, pallet service up to 1200 kg next day or two business days economy, and local company van delivery within 15 miles of Southampton, all kerbside, with the method confirmed by customer service after the order because the store cannot price carriage automatically across products of this size range.

Collection from Southampton is one route among those rather than the only one, so a 2.5 m profile can be planned into a delivery with the rest of a system order — including the reinforced layer and the thin-coat silicone render that finish over the trim.

Is the 220 mm White Oversill the Right Depth for Your Elevation?

• Deep build-ups on a white trim scheme: the right call where the measured finished face needs more clearance than the 170 mm projection gives, and the elevation runs white frames and rainwater goods.
• Where the 170 mm looks borderline: take this profile for £2.50 more, the cheapest step in the range and the lower-risk order when the figures are close.
• Where the build is modest: the 170 mm white oversill or the 140 mm white oversill keeps the trim proportionate to the wall, since an over-deep projection adds visual mass to the window detail for no water-management gain.
• Where the build exceeds this projection: nothing deeper is stocked in white, so raise it with the desk before ordering rather than accepting a marginal drip.
• Mixed elevations on one property: depths can be mixed while cap, colour and length stay constant, so label profiles by elevation on the order sheet and keep the cuts off the wrong wall.
• Dark or contrast trim schemes: the anthracite profiles at all four depths sit in the same oversill and verge trim collection.

FAQ — Depth Choice, Quantities and Ordering the Deepest White Oversill

How do I know 220 mm is deep enough?

Add up the full build you are applying — adhesive, board, basecoat and finish — then check the 220 mm projection clears that figure by the drip margin your system detail asks for. Both the margin and the insulation band are manufacturer figures this page could not source, and three Renders World pages currently quote different bands for this depth, so send the measured build-up and the elevation's exposure to the technical desk before ordering.

How many profiles and cap pairs does one window take?

One 2.5 m length covers most domestic openings without a joint, and one cap pair closes that run at both ends.

• Single opening, one length: one profile and one pair, £36.30 in materials.
• Bay in three sections: three profiles as measured and three pairs.
• Opening wider than one length: plan the joint away from the visual centre of the window, where a seam on a deep trim face is most visible.

Is it worth £2.50 more than the 170 mm?

Where the two are close on measured build depth, yes — it is the smallest price step in the range and buys 50 mm of extra projection, while a projection that turns out too shallow means changing trim after the render is on. Where the build clearly sits inside the 170 mm reach, the shallower profile keeps the window proportions better and saves the £2.50.

Is there a deeper white profile if this one is not enough?

Not in this range — 220 mm is the deepest white projection stocked, so a build-up beyond its reach is a conversation with the desk about alternatives rather than a bigger size in the same family. Worth having before the boards go on, since the sill detail is easier to solve at design stage than at scaffold stage.

How does an oversill differ from a verge trim at the same depth?

By the direction of the return. An oversill turns down at the front to shed water clear of the wall below an opening, while a verge trim turns up at the back to terminate the system against a fascia or coping. They share colour, length and end caps, do opposite jobs, and are not interchangeable.

Does a deep projection matter on a sensitive facade?

It changes the proportions of the window detail more than any other depth in the range, so on a listed building or in a conservation area show the profile on elevational drawings and raise it with the local planning authority at design stage. That conversation is straightforward early and awkward once the scaffold is up.