John Guest Speedfit LowFit™ 16mm Castellated Panels are specifically engineered to deliver a high heat output while maintaining a low floor build-up in screed underfloor heating systems. The 16mm profile features evenly spaced castellations at 50mm centres, allowing 12mm pipe to be clipped securely and positioned accurately in line with system design requirements.

Designed for fast and straightforward installation, the panels incorporate an overlapping alignment system for precise, hassle-free laying. A high-strength adhesive backing enables direct fixing to the existing subfloor structure, reducing installation time and improving stability. The open grid design ensures screed flows evenly around the pipes and castellations, creating a strong and stable finished floor construction.

Key Features & Benefits:

• Ideal for screed floor underfloor heating applications

• Low-profile 16mm panel for 12mm pipe (total floor height including screed: 19–21mm)

• High heat output performance at low flow temperatures

• Compatible with 50mm, 100mm, 150mm, or 200mm pipe spacing

• Open grid design promotes smooth screed flow for a solid floor build-up

• Peel-off adhesive backing for secure, hassle-free installation to subfloor

• Overlapping panel system ensures accurate alignment

• Manufactured from 100% recyclable material

• Suitable for underfloor heating applications only