Description
The 163 mm channel is the widest standard member of the base-track ladder, and the manufacturer's own range runs wider still. What follows separates the figures the vendor's technical table actually carries from the ones a naming convention only implies.
What the Widest Standard Channel Is Sized to Carry
Base track 163mm 2.5m is the starter profile levelled above the DPC to carry a 160 mm graphite EPS board, which declares a thermal resistance of 5.00 m²K/W under EN 13163:2012+A1:2015. That resistance belongs to the board rather than the profile — what the track contributes is geometry, holding the bottom edge of a deep first course to a single line and giving basecoat and render a defined stop at the plinth. Renders World holds it on the matched insulation fixing accessories shelf, so channel, board and plug are settled in one order.
At this depth the base line stops being a convenience and starts being the reference the whole facade inherits.
- Deep retrofit where the calculation lands at 150 or 160 mm, and the base course has to be set before any sill or threshold detail is committed.
- Elevations at mixed depth, where the main wall runs deep while reveals and returns take a narrower channel off the same datum.
- Work tied to a fixed DPC height, where the render stop meets an existing line rather than a convenient brick course.
- Jobs where the facade line moves well past existing details, and sills, meter boxes and thresholds are surveyed before the track is fixed rather than after.
Figures on File for a 150–160 mm Base Course
| Parameter | Value | Scope |
|---|---|---|
| Channel width | 163 mm | PROFIGIPS plinth profile technical table, code AC |
| Available lengths | 2.0 m and 2.5 m | As above; this SKU is the 2.5 m length |
| Carton quantity | 10 pieces | As above; the range's narrower widths pack 20 |
| Pallet quantity | 1,500 pieces | As above |
| Material | Aluminium | PROFIGIPS material listing for the plinth profile |
| Drip cap | Present | Manufacturer's product description, as a feature not a dimension |
| Declared thermal resistance at 160 mm | 5.00 m²K/W | EPS 032 Fasada Extra board; declared row, not thickness ÷ λ |
| Declared resistance at 150 mm | 4.65 m²K/W | As above |
| Declared thermal conductivity | λD 0.032 W/mK | EPS 032 Fasada Extra graphite EPS board |
| Reaction to fire | Class E | EPS 032 Fasada Extra board alone, never a rendered build-up |
| Gauge and finish | Not published | Vendor's table carries width, length and pack only |
| Fixing centres for the profile | Not published | No installation instruction retrieved this session |
Declared resistance is the figure worth quoting because it is the one the manufacturer stands behind, and dividing thickness by conductivity returns a slightly different answer that appears on no document. A whole-wall U-value is a build-up calculation rather than a property of a board or a channel, and the U-value and thickness calculation method owns that sum.
The carton break is the practical detail on this width. Narrower profiles in the same family pack twenty to a carton and this one packs ten, so a buyer comparing carton prices across widths is comparing different quantities of profile.
Why the Deep Datum Gets Set Before Anything Else
- Depth multiplies every error — a base line out by a few millimetres reads as a visible step once a deep build-up carries it up the elevation, so the datum is worth the extra survey time here more than anywhere.
- Existing details have to move first — a deep facade line puts sills, thresholds and meter boxes inside the new wall zone, and surveying them before the track goes on keeps that work off the critical path.
- The plug step is a manufacturer table — length and count are published figures rather than rules of thumb, and the plug length calculation method settles the substrate side before the first board is bonded.
- Width and gauge are separate questions — this channel is also stocked in a profile named for a heavier 1.0 mm gauge, so a specification calling out starter-rail thickness is answered by that named member rather than by this one.
- The manufacturer's range runs wider — 183 mm and 203 mm channels exist in the same family, so a build-up beyond this width is a sourcing question rather than a dead end.
- A 2.5 m module keeps the take-off simple — every length in the ladder matches, so ordering against measured runs stays straightforward arithmetic.
How to Install the Profile, Then Bond a Deep First Course
All of this happens before a bag of adhesive is opened, and at this depth the sequence matters more than the technique.
- Survey the details before the datum — mark where the finished facade line will fall against existing sills, thresholds, soil pipes and meter boxes, so the extensions and relocations are known while the wall is still bare.
- Establish one datum and project it — set the base line above the DPC with a laser, carry it to every elevation from that single reference rather than transferring by spirit level, and snap a chalk line so the height survives until boarding starts.
- Check the channel against the actual board — offer up an off-cut with its adhesive bed allowed for, and confirm it seats squarely on the shelf rather than riding the lip. A 150 mm board in a 163 mm channel leaves clearance behind it; a 160 mm board leaves very little.
- Dry-run the lengths before drilling — laid along the chalk line they show a fixing point landing on a movement joint or a service penetration while it is still a pencil mark.
- Fix to the profile's own instructions — drill diameter, plug type and fixing centres come from those instructions or the system designer for the substrate in question, confirmed on the first length rather than carried from the last job.
- Keep the run continuous at corners and leave the movement allowance those instructions call for, so the base and its drip cap read as one line around the building.
Once the run is verified level, boards are bonded off the shelf and the reinforcement detail the render system calls for is set at the base edge. The first-day base track and datum method covers levelling in full, and the EWI fixings installation sequence picks the elevation up from the first bonded course.
Plug Length and Count Above a 150–160 mm Course
The fastener schedule is a manufacturer table, and the LTX-10 data sheet publishes it directly: length equals board thickness, plus adhesive and any old plaster, plus 30 mm anchorage into the structural substrate.
| Plug length | New build, 10 mm adhesive | Over 20 mm existing plaster |
|---|---|---|
| 180 mm | 140 mm board (120 mm in aerated concrete) | 120 mm board (100 mm) |
| 200 mm | 160 mm board (140 mm in aerated concrete) | 140 mm board (120 mm) |
| 220 mm | 180 mm board (160 mm in aerated concrete) | 160 mm board (140 mm) |
The step that catches buyers out is the retrofit column. A 160 mm board on a wall keeping 20 mm of old plaster takes the 220 mm plug, not the 200 mm one that suits 160 mm on bare masonry — and at 220 mm the box drops from 200 pieces to 100, so the quantity changes with the length.
A 150 mm board sits between rows and takes the length above it rather than below. Recessing the collar with a cutter moves every row up one step. On count, the same sheet recommends a minimum of six fasteners per m² in the field of a wall and eight per m² in corner zones below 15 m, rising to eight and ten above that height, and states plainly that the recommendation does not replace the thermal insulation design. Those figures cover EPS and XPS boards only, and the fixing pattern and spacing method turns a wind zone and a building height into a real count, with the whole ladder of lengths on the starter tracks, plugs and discs shelf.
How This Width Sits Against the Rest of the Ladder
Renders World holds seven standard widths, and the table compares them on what the vendor's table actually declares — channel width at a common 2.5 m length.
| Profile | What the vendor's table declares | Where it sits |
|---|---|---|
| 23, 33 and 53 mm profiles | 23 / 33 / 53 mm, 2.5 m | Reveals, soffits and thin build-ups |
| 83 mm channel profile | 83 mm, 2.5 m, 20 per carton | Mid-ladder |
| 93 mm channel profile | 93 mm, 2.5 m, 20 per carton | Also stocked in a heavier gauge |
| 103 mm channel profile | 103 mm, 2.5 m, 20 per carton | Middle of the ladder |
| 163 mm profile (this product) | 163 mm, 2.5 m, 10 per carton | Widest standard member stocked here |
Nothing is stocked between 103 mm and 163 mm, so a build-up landing at 120 or 140 mm steps up to this channel with the slack taken up behind the board — the manufacturer lists 123 mm and 143 mm profiles that are not held here. Where the same channel is wanted at heavier gauge, the 1.0 mm gauge profile at this width is the named member for it. Where one elevation runs deeper than another, transition at an external corner so the change in plane absorbs the step under the basecoat.
Choosing and Ordering the Widest Standard Profile
- Measure the board, then pick the channel — take the thickness at the base course, allow for the adhesive bed, and choose the channel that seats it without slack. The order line then reads base track 163mm 2.5m.
- Price and availability — £11.40 per 2.5 m length, August 2026, shown as displayed on the product page, in stock. At one length per 2.5 m of base line, that is £4.56 per linear metre before corner waste: 11.40 ÷ 2.5 = 4.56. VAT treatment is as displayed at checkout and is not converted here.
- Work the length count as arithmetic — a 24 m base line gives 24 ÷ 2.5 = 9.6, so ten lengths cover it at £114.00, with one more worth carrying where corners are mitred.
- Order the boards on the same delivery — pairing the track with graphite EPS insulation boards keeps datum, channel and first course consistent.
- Where the specification calls for a stone wool layer, Renders World stocks Rockwool mineral wool insulation slabs; the declared class for those slabs comes from their own declaration of performance, and the fixing schedule from the system designer.
- Delivery — orders are processed the same day where stock is available, with courier delivery next working day on express or two business days on economy, kerbside.
FAQ: Channel Fit, Quantities and Application Limits
How many lengths does a deep-retrofit run need?
Divide the measured base line by 2.5 m and round up. A 24 m perimeter gives 24 ÷ 2.5 = 9.6, so ten lengths cover it at £114.00 on the August 2026 figure, and an eleventh is worth carrying where external corners and bay returns are cut. Measuring each elevation separately beats one perimeter figure, because the offcuts fall differently on every wall.
Which plug length suits a 160 mm board above this track?
On bare masonry with a 10 mm adhesive bed, the manufacturer table gives the 200 mm plug for a 160 mm board; where 20 mm of old plaster is staying, the same table moves to 220 mm. Both assume 30 mm anchorage into the substrate, the 220 mm length comes 100 to a box rather than 200, and holes in hollow or aerated blocks are drilled without impact so the pull-out resistance is preserved.
Does the channel take 150 mm as well as 160 mm boards?
Both fit within a 163 mm channel, and the two thicknesses declare 4.65 and 5.00 m²K/W respectively on the board card, so the choice between them is a calculation output rather than a track question. The 150 mm board leaves more clearance behind it for the adhesive bed; the fit is confirmed with an off-cut on site rather than assumed from the names.
How does this profile differ from the 1.0 mm version at the same width?
By the gauge named on it, and nothing else the vendor's table declares — both are aluminium, both are 163 mm, both come in 2.0 m and 2.5 m lengths. No gauge figure is published for this profile, so where a specification or system approval names a starter-rail thickness, the heavier profile is the member that answers it and the system holder confirms which the assembly was tested with.
Can the channel carry mineral wool slabs at this thickness?
Geometrically the channel takes any rigid slab that fits it, and wool is commonly bedded off a starter profile. What does not transfer is the fastener schedule: the LTX-10 sheet names EPS and XPS only, so plug type, length and count for a wool build-up are specified by the system designer against that system's own assessment, and the slab's reaction-to-fire class is read from its declaration of performance rather than from this page.
Does 160 mm on this track satisfy Building Regulations?
Compliance is a whole-wall calculation and never a property of one board thickness or one channel width. The U-value calculation for wall insulation thickness sets out the method, and the target for a particular project is confirmed by the assessor working on it. A deep build-up also moves the facade line well past existing sills, and whether it stays within permitted development is confirmed with the local planning authority under current guidance.
Technical Documentation Fetched This Session
- PROFIGIPS plinth profile technical table — channel widths, available lengths, carton and pallet quantities, material and drip cap for the profile range this SKU belongs to.
- EPS 032 Fasada Extra technical card, no. W32FE — declared resistance per thickness, λD and reaction to fire for the boards this channel carries.
- Klimas LTX-10 fastener product data sheet — selection table, anchorage depths, box quantities and fastener-count recommendation for the courses fixed above the track.