Multi-fix has good thermal performance and fire safety and is suitable for a variety of roof coverings including:
Fully bonded, partially bonded, mechanically fastened single-ply membrane systems and EPDM membrane systems
Torch-applied, bitumen-based and mastic asphalt built-up systems
Liquid membranes / Liquid applied systems
Green roof systems
On the other hand, UB34 is more impact and weather-resistant and is more suitable for upstands and parapet walls, UB34 is the best choice.