Movement kills flat roofs — plan for it. E280 creates an expansion joint across large areas (commonly advised over ~50 m²) and can also form a decorative mop-roll ridge detail. Fit over a prepared deck gap, then glass right over it for a strong, flexible detail that takes up thermal movement. 

Why roofers pick it

• Controls thermal movement on large spans.
• Dual-use: also reads as a traditional lead mop-roll on ridges.
• System fit: install with PU adhesive + pins, bandage, then laminate/topcoat with RORR.

Install notes

• Cut a deck gap (e.g., around 25 mm typical practice), bed E280 over it, fix and bandage; laminate with RORR CSM, finish grey.

Specs (typical)

• Length: 3 m | Accessory: compatible ridge closures offered by some ranges.

FAQs — E280 Expansion Joint

Do I always need expansion joints?
They’re recommended on larger roofs to accommodate movement; follow your spec. 

How do I prepare the deck?
Create a controlled gap, then fit and bandage E280 before laminating. 

RORR compatible?
Yes — use RORR Resin + Catalyst, RORR CSM, RORR Grey Topcoat.