Ultra Soffit Liner Rockfibre

Product Information

Ultra Soffit Insulation Liner Rockfibre

Ultra Soffit Liner Rockfibre is a non-combustible rigid mineral wool rockfibre insulation board for installation to the underside of concrete soffits. It is suitable for use for in domestic and commercial applications and can be fixed directly to the underside of concrete slabs, or to timber or metal framing systems using appropriate fixings.

The soffit insulation board is available in a range of facings including a 6mm thick non-combustible cement fibre board, class 0 aluminium foil, and white or black tissue. The product can also supplied as a plain slab with no facings.

Depending on the U value requirement, the product is available in a range of thicknesses. Larger thicknesses may consist of multiple layers of rockfibre laminated together. Alternatively the insulation can be supplied as a multiple layer to be fixed separately.

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Installation Guidelines

The soffit insulation boards should be mechanically fixed directly to the soffit or soffit frame. Fixings should be at maximum 600mm centres, positioned between 50mm and 150mm from the board edge and the fixing should penetrate the substrate by minimum of 25mm.

The boards should be tightly butted together at joints. Boards with the cement fibre facing should be cut on site using a TCT saw. The plain or foil/tissue faced boards can be cut with a fine-toothed hand saw. Cutting boards will produce some dust so use of a face mask is recommended.


Direct Fixing To Concrete Soffit

  • Fix the Ultra Soffit Liner board directly to the underside of the semi-exposed soffit using proprietary fixings.
  • Use fixings at nominal 600mm centres around the edge and throughout the board.
  • The length of fixing is determined by the board thickness and the fixing manufacturer’s load-bearing recommendations.

Fixing To Metal Framing Timber Battens

  • When using MF system framing, fix the frame to the soffit as per the manufacturer’s recommendations.
  • Fix the Ultra Soffit Liner at right angles to the MF top hat sections at nominal 600mm centres around the edges and throughout the board.
  • When using timber battens, these must be fixed at maximum 600mm centres and ensure that all four edges of the board are supported.
  • Fixings must be allowed to penetrate a minimum of 25mm into the timber.

Fixing Pattern


U Value Examples

Rockfibre Insulation Thickness
125mm
150mm
160mm
180mm
220mm
300mm
U Value W/m2k
0.25
0.21
0.20
0.18
0.15
0.11

Ultra Soffit Rockfibre Insulation
Board Size 600mm × 1200mm
Insulation Thermal Conductivity 0.034 m2k/W
Insulation Fire Rating Al Non-combustible: EN13501-1
Cement Fibre Facing Board
Thickness 600mm × 1200mm
Nominal Weight 7.6kg/m2
Fire Rating Al Non-combustible: EN13501-1
Colour Grey

Handling and Storage

Ultra Soffit Liner board is supplied packed on pallets. The boards need to be stored off the ground and clear of standing water. If stored outside, additional protective covering is recommended to prevent the boards becoming wet. Boards should be kept dry until installation.

Environmental Properties

Ultra Soffit Liner boards offer no threat to the environment and have zero ozone depletion potential (ODP). The global warming potential (GWP) of the rockfibre insulation is zero.

Fire Properties

The Ultra Soffit Liner Rockfibre insulation product has been independently tested at Warrington Fire Research Centre to EN 13501-1 and achieves a Euroclass A2,1,dO non-combustible fire rating.


Recent Projects

Project Title: Greenmill Gardens, Leeds
Main Contractor: Morgan Sindall
Products Supplied: Ultra Soffit Liner Rockfibe FB (Cement Facing Board)
226mm thick

 

Project Title: Pall Mall Apartment Block, Liverpool
Main Contractor: Graham Construction
Products Supplied: Ultra Soffit Liner Rockfibe FB (Cement Facing Board) 136
and 150mm thick
Ultra Soffit Liner Rockfibre Plain 100mm

 

Project Title: Chapel Street Apartments and Retail Units, Salford
Main Contractor: Eric Wright Construction
Products Supplied: Ultra Soffit Liner Rockfibe FB (Cement Facing Board)
226mm thick
Ultra Soffit Liner Rockfibre FB (Cement Facing Board) 56mm
thick
Project Title: Riverside Regeneration, Rochdale
Main Contractor: Wilmott Dixon
Products Supplied: Ultra Soffit Liner Rockfibe Plain 100mm and 150mm thick

 

Project Title: Crown Street, Residential Development, Salford
Main Contractor: Renaker Build
Products Supplied: Ultra Soffit Liner Rockfibe FB (Cement Facing Board)
176mm thick
Ultra Soffit Liner FF (Foil Faced) 170mm thick

 

Project Title: Queen Street Residential Development, Salford
Main Contractor: Renaker Build
Products Supplied: Ultra Soffit Liner Rockfibre FB (Cement Facing) 126mm thick

 

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