Description
The 1 mm Base Track 93 mm × 2.5 m is the heavy-duty aluminium starter profile in the 93 mm range, pressed from gauge nearly twice as thick as the standard version for multi-storey EWI work, highly exposed sites, and system-certified assemblies that call for a thicker starter rail. It accepts the same 90 mm insulation boards as the standard profile.
This track is part of the insulation fixing accessories range at Renders World and pairs directly with 90 mm graphite EPS boards from the EPS insulation boards collection.
What the 1 mm Heavy-Duty 93 mm Base Track Does in a UK EWI System
The 1 mm base track is a heavy-duty aluminium starter profile that carries 90 mm insulation boards on multi-storey or highly exposed UK EWI builds, fixed above the DPC at 300 mm centres to set a rigid perimeter datum that resists deflection under sustained board weight and wind load.
- On the wall — sets the perimeter datum and holds the line under heavier cumulative board weight than a standard-gauge profile can carry without deflection.
- On the system — drains the splash-back zone via an integral drip edge and ventilates residual moisture through a perforated horizontal web.
- On the certification — satisfies EWI system approvals that specify a 1 mm gauge starter profile as part of the tested fire or structural assembly.
What Makes the 1 mm Heavy-Duty 93 mm Base Track Worth Specifying
- 1 mm aluminium gauge — nearly twice the thickness of the standard 0.6 mm profile, with measurably higher bending resistance to support the cumulative dead load of insulation boards on taller facades.
- Specified for system-certified assemblies — where the EWI system holder's fire or structural test was conducted with a 1 mm gauge starter rail, this profile satisfies the certification without derogation.
- Sized for 90 mm solid-wall insulation — the 93 mm internal channel accepts 90 mm EPS graphite boards, the thickness most commonly calculated for 9-inch solid brickwork targeting a U-value in the region of 0.30 W/m²K, subject to calculation.
- Integral drip edge — the formed lower lip projects clear of the wall face, shedding rainwater and splash-back away from the base zone where moisture exposure peaks.
- Perforated horizontal web — ventilation apertures allow construction moisture and minor vapour drive to escape from behind the boards, supporting long-term drying performance.
- Familiar site procedure — fixes at the same 300 mm centres as the standard track and accepts the same clip-on mesh profile, so install sequence stays identical despite the heavier gauge.
Technical Specifications — 1 mm Heavy-Duty 93 mm Base Track
| Property | Value |
|---|---|
| Profile width | 93 mm |
| Length per piece | 2,500 mm (2.5 m) |
| Material | Aluminium alloy |
| Gauge | 1.0 mm (heavy-duty) |
| Finish | Natural mill aluminium |
| Drip edge | Integral lower lip |
| Ventilation | Perforated horizontal web |
| Recommended fixing centres | 300 mm |
| Suitable insulation thickness | 90 mm boards |
| Pre-installed mesh | No — clip-on profile required |
The 1 mm gauge sits at the heavy-duty end of the range. Where loading and exposure are within domestic norms, the lighter 0.6 mm profile in the same 93 mm width covers the same 90 mm board specification at a lower cost; where the project moves to wider insulation at the same heavy gauge, a 1 mm 163 mm equivalent picks up the spec for 160 mm boards.
Where the 1 mm 93 mm Base Track Performs Best — Multi-Storey, Exposed, Certified
This profile earns its place in three distinct scenarios. Each represents a real load or specification step that the standard 0.6 mm gauge is not intended to cover.
- Multi-storey EWI installations — on buildings of three storeys or more, the cumulative dead weight of insulation above the base track is significantly greater than on a typical two-storey domestic property; the 1 mm gauge holds the line without the deflection that would telegraph through the finished render as a visible ripple at the base.
- Highly exposed sites — coastal locations, hilltop developments, and corner plots on prevailing-wind frontages place sustained lateral pressure on the cladding; the thicker gauge resists wind-driven loading at the base zone more effectively than the standard profile.
- System-certified assemblies — where an EWI system holder's BBA, fire, or structural test was conducted with a 1 mm gauge starter rail as part of the tested build-up, substituting a thinner profile would invalidate the certification; this track satisfies that test specification directly.
The track pairs with 90 mm graphite EPS boards from the EPS insulation boards collection, and equally with 90 mm mineral wool slabs on projects where an A1 fire-rated insulation layer sits above the heavy-duty starter rail as part of a wider compliance strategy.
How the 1 mm 93 mm Base Track Installs Above the DPC
For the best result, establish the datum line with a laser level transferred around the full building perimeter before fixing any track. The profile sits typically 150 mm above finished ground level and directly above the existing DPC. The 1 mm aluminium requires marginally more pressure than the standard gauge when drilling fix holes, but a sharp HSS bit cuts cleanly without difficulty.
Pre-drill at 300 mm centres with a 6 mm masonry bit and fix through into the substrate with plugs and screws rated for the brickwork or block being anchored. On multi-storey projects where the specification calls for enhanced pull-out resistance, step up to stainless-steel screws with high-load nylon plugs or resin anchors, particularly on older brickwork with variable mortar quality. Leave a 2–3 mm expansion gap between adjacent lengths — the heavier gauge generates marginally higher thermal expansion forces, so maintaining the gap is essential.
- Cutting tool selection — aviation snips or a fine-tooth metal-cutting disc on an angle grinder; standard tin snips distort the edge at 1 mm gauge.
- External corners — mitre-cut both lengths at 45° using aviation snips, and deburr every cut edge with a flat file before the boards go in.
- Internal corners — butt one length cleanly into the adjacent wall face and seal the junction with a compatible flexible sealant.
Once the run is fixed and verified level, apply adhesive to the rear face of each 90 mm board and seat it firmly into the channel. The clip-on mesh profile attaches to the front lip ahead of the basecoat layer. Step-by-step procedures for fixing patterns, mechanical anchor placement above the track line, and adhesive coverage rates are covered in the EWI fixings installation guide.
Pro Tips From UK Installers Fitting the 1 mm Heavy-Duty Track
The 1 mm track behaves differently to the standard profile on site, and a few practices keep the heavier gauge working for the install rather than against it.
- Feel the rigidity in the hand — a full 2.5 m length of the 1 mm profile holds its shape when carried; the standard 0.6 mm version flexes noticeably. That rigidity is the point: the base track is carrying more board weight per linear metre on a taller building, and any sag between fixings shows up as a visible ripple in the finished render line.
- Budget extra time per corner — tin snips will struggle with 1 mm aluminium, so plan on an angle grinder with a fine-tooth disc or a nibbler for clean mitre cuts. A few extra minutes per corner protects the fit at the junction.
- Deburr every cut edge — sharp 1 mm aluminium edges slice through mesh and gloves faster than the 0.6 mm gauge ever does; a flat file or deburring tool across each fresh cut prevents damage to boards, basecoat reinforcement, and hands.
- Step up to the wider heavy-duty profile where the spec calls for thicker insulation — deep retrofits at 160 mm boards on the same heavy-duty gauge transition cleanly onto the 1 mm aluminium 163 mm base track without dropping back to a lighter starter rail.
Is the 1 mm Heavy-Duty 93 mm Base Track Right for Your Project?
- Ideal for multi-storey and exposed-site EWI projects — choose this 1 mm heavy-duty track when the building is three storeys or more, the site is highly exposed to sustained wind loading, or the EWI system certification specifies a 1 mm gauge starter profile as part of the tested assembly.
- For standard two-storey domestic retrofits — the 0.6 mm standard-gauge 93 mm base track covers the same 90 mm board specification at lighter weight and lower cost, suitable for the majority of residential solid-wall projects under normal loading.
- For heavy-duty starter rails at wider insulation thicknesses — the heavy-duty 163 mm profile for 160 mm boards carries the same 1 mm gauge through to deep-renovation and near-zero-energy build-ups where thicker insulation is specified.
- For companion fixings and clip-on mesh profiles — browse the wider fixing accessories range for masonry anchors, spiral plugs, hole cutters, and mesh carriers that complete the heavy-duty base-track installation.
FAQ — 1 mm Heavy-Duty 93 mm Base Track Coverage, Compatibility, Ordering
Is the 1 mm track worth the extra cost on a two-storey house?
On a standard two-storey domestic property with normal exposure conditions, the 0.6 mm gauge track provides more than adequate support for 90 mm insulation boards. The 1 mm profile adds cost and weight without a proportional performance benefit at that scale. The heavy-duty version becomes cost-justified when the building height, wind exposure, or system certification specifically requires it — if the project specification does not call for 1 mm gauge, the standard track is the appropriate choice.
Can I mix 1 mm and 0.6 mm tracks on the same building?
Mixing gauges on the same elevation is not recommended, because the difference in rigidity creates an uneven deflection pattern under load that can telegraph through the finished render as a visible line at the junction. Where different gauges are genuinely needed — a 1 mm track on an exposed gable and a 0.6 mm track on a sheltered rear wall, for example — transition at an internal or external corner where the change in plane masks any dimensional difference between the two profiles.
Does the heavier gauge affect the clip-on mesh profile fitment?
No. The front-edge geometry that accepts the clip-on mesh carrier is the same on both the 0.6 mm and 1 mm profiles. The clip-on profile snaps onto the lip identically regardless of gauge, so no alternative mesh carrier is required when specifying the heavy-duty track.
What cutting tools work best for 1 mm aluminium?
Aviation snips, also known as compound-action tin snips, handle straight cuts through 1 mm aluminium cleanly. For mitre cuts at corners, a fine-tooth metal-cutting disc on an angle grinder gives the most precise result. Standard single-pivot tin snips may distort the profile edge at this gauge. After cutting, deburr every edge with a flat file or deburring tool to prevent damage to insulation boards, mesh, and gloves during the rest of the install.
What fixings should be specified to anchor a 1 mm heavy-duty track?
Standard nylon frame plugs with 6 mm masonry screws work for sound brickwork on domestic-scale heavy-duty applications. On multi-storey buildings, exposed sites, or substrates with variable mortar quality, step up to stainless-steel screws with high-load nylon plugs, or to resin-bonded anchors at fix points where the masonry is friable. The full fixing pattern for the boards above the track is covered in the EWI fixings installation guide.
How does the 1 mm gauge interact with EWI system certification?
Many EWI system holders certify their assemblies with a specific starter-rail gauge written into the tested build-up. Where the certification names a 1 mm gauge profile, substituting a 0.6 mm rail would step outside the tested specification and could invalidate the certification, fire test, or BBA approval for that assembly. The 1 mm heavy-duty track satisfies system specifications that call out 1 mm gauge starter rails directly. For projects where the system holder's certification accepts either gauge, the choice can be made on loading and exposure criteria rather than on certification grounds.