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ROCKWOOL launches HARDROCK® Multi-Fix (DD); a new versatile system solution for all flat roof membrane types.

ROCKWOOL UK has launched its new flat roof board; HARDROCK® Multi-Fix (DD) in the presence of a selection of the UK’s largest roofing contractors. The board has been developed in response to listening to the market over the past 3 years and shows ROCKWOOL’s long term commitment to the flat roof sector.

With its unique facing, HARDROCK® Multi-Fix (DD) is compatible with all waterproof membranes and in conjunction with its superior acoustic and fire performance is now one of the most diverse roofing boards available within the UK market. This new system replaces all the current HARDROCK (DD) range.
The new system is extremely competitive in comparison to foam warm roof systems when used in acoustic and non-combustible roof systems and is a more cost effective solution.
The new roof board is exceptionally versatile and is suited to liquid applied, bonded single ply and torched bitumen systems.

The new HARDROCK® Multi-Fix (DD) system will consist of only 8 product options which significantly reduces the complexity of our current range. The improvements to the product
range will also mean that all options are held in stock, this will significantly improve the availability and enhanced service level of the new system.

Should you have any questions or require assistance with projects suited to the HARDROCK® Multi-Fix (DD) system then please do not hesitate to contact our Flat Roof Internal Specification Consultant Atiya Rehman on


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