ARC Spandrel Barrier

Stop fire racing up the gable … before the scaffold even comes down

Where a pitched roof meets an external wall, the cavity continues all the way to the verge unless you close it. ARC Spandrel Barriers push-fit into that awkward wedge, delivering a certified line of defence against fire, smoke and sound transfer in seconds.

• Euroclass A1 mineral-wool core with white polythene sleeve – no added fire load, weather-safe on site.

• 60 minutes fire integrity & insulation to EN 1366-4, third-party approved (IFCC 1727).

• Lambda 0.037 W/m·K: tackles the thermal bridge at the roof–wall junction, easing SAP calculations.

• Works with masonry walls and panelised timber or light-steel spandrel panels.

• No fixings – compression holds the barrier until the outer leaf is completed.

Need a drawing mark-up? Email plans to our tech desk or phone 0118 922 7941 – 35 years’ envelope know-how on tap.

Select the right barrier in seconds

*Click a code to jump straight to the bagged size on Spechunter.
Need >200 mm? Ask about made-to-order widths up to 300 mm.

How to install – three quick steps

1. Measure & cut – 1.2 m lengths trim with a hand saw; keep joints tight.

2. Compress & insert – push the barrier into the sloping cavity until the sleeve sits flush with the inner leaf. Maintain 5 mm compression.

3. Butt & seal – tight butted joints are fine; gaps > 5 mm get a mineral-wool off-cut or intumescent acrylic.

Pair with ARC Cavity Stop Socks at floor lines and ARC Party-Wall DPC Horizontal where separating walls meet the roof.

Compliance snapshot

Frequently asked questions

Do I need mechanical fixings?
No – the wedge profile and compression fit hold the barrier until the wall is closed.

Is this product suitable for timber-frame spandrel panels?
Yes – simply fit the barrier tight to the panel edge before craning into place. For party-wall edges use ARC TCB Timber Barriers.

What about cavities over 200 mm?
ARC can manufacture special widths up to 300 mm – typical lead time five working days; contact us for a quote.

Can I get next-day delivery?
Order before noon, meet the £200 ex-VAT threshold and check our delivery information for remote-area surcharges.

Complete your roof-line specification

• Party-wall stops – PW-TCB or PW-DPC Socks

• Window reveal closers – Rockfibre Insulated DPC

• Wide cavities – step up to ARC T-Barrier Masonry

Order today for free next-day UK delivery – and chase down every last spec with Spechunter.

Spechunter.co.uk – Chasing down specialist construction specifications since 1988. Fact checked & updated May 2025.