CTF-UB2: Stone Wool/MgO Upstand

CTF-UB2 is an upstand board for use in inverted roof applications to prevent cold bridging.  The CTF-UB2 consists of flat CTF-05 (stone wool) board laminated to a flat CTF-FS2 (MgO), providing an A2 non-combustible product to comply with building regulations.




  • A2 non-combustible 
  • Standard stock item available 
  • Alternate coloured finishes available 


Technical Data


CTF-05 Flat
Reaction to fire A1 EN 13501-1
Thermal conductivity @10%c 0.037W/m²K EN 12667
Compressive @10% deformation 30kpa EN 826
Tensile Perpendicular to face 15kpa EN 1607
Length 1200mm +/-2% EN 822
Width 600mm +/- 1.5% EN 822
Thickness 50mm T5 EN 823
Vapour transmission MU1 EN 12086
Water absorption ≤3gm/m² max NPD EN 12087
CTF Factory Adhesive
(Tensor grip L17 applied @ 16gm/m² A2-s1,d0 reaction to fire classification)
Reaction to fire A2 EN 13501-1
CTF-FS2 Flat
Reaction to fire Euroclass rating A1 EN 13501
Thermal conductivity 6-10mm 0.19W/m²K EN 12667
Density @10%c 1100kg/m³ EN 12467
Vapour resistance 0.31MNs/g EN 12572
General board size 1200mm 600mm EN 13165
Board thickness 6mm EN 13165
Solubility Insoluble in water EN 12467
Freeze / thaw resistance Pass EN 12467


  • Exposed upstands for inverted roofs
  • Mechanically fixed