1.5mm Aluminium Retention Trim - 2.4m Length

Create clean, secure edges on green roofs with lightweight aluminium trim that won't compromise drainage.

This 2.4m retention trim is designed to keep green roof materials in place while allowing water to drain freely. Made from lightweight 1.5mm 1050A-grade aluminium, it's easy to handle on-site and provides a professional finish to roof edges. The perforated base ensures proper drainage, making it ideal for sedum, gravel, or ballasted roofing systems. Suitable for domestic and commercial use, this trim delivers long-term durability in a simple form.

Choose a variant:

Retention Trim Size

Starting at £17.66

excluding shipping cost

Features + Benefits

2.4m length reduces the number of joints needed
1.5mm aluminium for easy handling and clean finish
Retains gravel, soil, and planting media on green roofs
Drainage slots allow water to pass through freely
L-shaped profile prevents displacement of roof materials
Fire-rated A2-s1,d0 for full compliance
Coated with external-grade polyester powder
Works with most green roof designs
Available in RAL/BS colours
Fully recyclable and made in the UK

Specs & Options

Material: 1050A Grade Aluminium
Thickness: 1.5mm
Length: 2.4 metres
Finish: Polyester powder-coated (external grade)
Fire Rating: A2-s1,d0
Drainage: Pre-drilled perforations along the base
Use Case: Sedum roofs, gravel retention, roof gardens
Colours: Full RAL and BS colour range
Lead Time: 3 to 5 working days
Custom Sizes/Shapes: Available on request

Installation / Usage Instructions

Fix the trim along the edge of the green roof where materials need to be contained. Align drainage holes outward. Fasten securely to the substrate. Can be cut to length as needed. No special tools required.

Looking for a lightweight edge trim for your green roof?

This 1.5mm aluminium retention trim is simple, effective, and built to last. Order now or contact the Online Metal Store team for project support or bespoke sizes.