The 8mm Screw Fixing with Metal Pin & Short Expansion Zone is a robust, screw-in fastener for external wall insulation (EWI) systems. It features a durable polyethylene body and a steel pin sealed in a plastic head to reduce point thermal conductivity and resist corrosion. The short 8mm expansion zone delivers strong anchorage with minimal installation effort, while the innovative sleeve ensures a flush finish and stable performance. Suitable for EPS, XPS and Mineral Wool (with support washers), this fixing offers quick, controlled installation via a TX-40 drive.
Suitable Insulation Boards
| Insulation Type |
Compatibility |
| EPS (Expanded Polystyrene) |
Compatible |
| XPS (Extruded Polystyrene) |
Compatible |
| Mineral Wool |
Compatible (use support washers) |
| PIR / Phenolic (e.g., Kingspan) |
Not compatible |
| Wood Fibre |
Not compatible |
Compatible Substrates (ETA Categories A–E)
| ETA Category |
Substrate |
Compatibility |
| A |
Concrete |
Compatible |
| B |
Solid ceramic brick / silicate brick |
Compatible |
| C |
Ceramic block (vertically perforated) / hollow block |
Compatible |
| D |
Lightweight aggregate elements (e.g., LAC) |
Compatible |
| E |
Aerated concrete (AAC) |
Compatible |
If the substrate condition is uncertain, carry out a pull-out test to confirm suitability.
Key Features
- TX-40 screw-in drive for quick, controlled installation with reduced risk of substrate damage.
- Plastic-sealed steel pin minimises point thermal transmittance and improves corrosion resistance.
- Short 8mm expansion zone provides strong anchorage in a wide range of substrates.
- Innovative sleeve and collar seat flush with insulation; adhesive pockets improve bond to basecoat.
- Compatible with EPS, XPS and Mineral Wool (support washers required for Mineral Wool).
- ETA-13/0724 approved for EWI/ETICS applications.
Sizes & Box Quantities
| Size (Ø8mm) |
Box Quantity |
| 95 mm |
200 per box |
| 115 mm |
200 per box |
| 135 mm |
200 per box |
| 155 mm |
200 per box |
| 175 mm |
200 per box |
| 195 mm |
200 per box |
Select length based on insulation thickness + adhesive layer + required embedment depth.
Application
Preparation
- Mark out the fixing grid to suit the system design and wind-load zone.
- Check for hidden services (cables/pipework) before drilling.
- Select the correct drilling mode: use rotary-only for hollow blocks and AAC; use hammer mode for dense concrete/brick as appropriate.
Installation steps
- Apply adhesive to the boards per your EWI specification and place boards tightly with staggered joints.
- Drill perpendicular through the insulation into the substrate using the selected drilling mode; clean the hole of dust.
- Insert the fixing body.
- Drive the metal pin using a TX-40 bit until the washer is seated flush; do not over-drive or dish the insulation.
- Install the specified number of fixings per board, adding extras around corners, openings and high-load areas.
- Proceed with basecoat and reinforcement mesh in line with the system specification. Surface or recessed installation may be used where specified.
Fixing pattern & density
- Follow the project design; as a guide, many façades use 4–6 fixings per m², with additional fixings at edges and around openings.
- Maintain consistent edge distances; avoid placing fixings too close to board edges or through joints unless specified.
Quality checks
- Carry out pull-out tests where substrate variability is suspected.
- Replace any fixings that spin or fail to grip; re-drill if necessary.
