Mayplas Thermal Roof Panel System is designed for use as warm roof rafter insulation within pitched roofs. The system consists of a high density rock fibre upper panel and a low density rock fibre lower panel.


  • Reduces condensation risks.
  • Easy to fit roof panel system.
  • Excellent thermal insulation.
  • Creates warm room loft space.

General information

Uniclass 2015

Pr_25_57_06_50 Mineral fibre slab insulationPrimary


P10/10 Loft insulation

P10/125 Insulation laid between ceiling ties/ joists

P10/135 Insulation laid across ceiling ties/ joists

P10/140 Insulation fitted between rafters

P10/15 Insulation fitted between rafters

Specification data - Mineral fibre slab insulation

Product Reference

325 Thermal Roof Panel System



Upper panel

40 mm

50 mm

60 mm

65 mm

70 mm

75 mm

80 mm

90 mm

100 mm

Lower panel

50 mm

60 mm

75 mm

100 mm

Product Options

Upper panel:

  • Type: High density rock fibre slab.
  • Panel size: 1200 x 900 mm.
  • Fire performance: Class 0 to The Building Regulations.
  • Thermal conductivity: 0.036 W/mK.

Lower panel:

  • Type: Low density rock fibre slab.
  • Panel size: 1140 x 600 mm.
  • Fire performance: Class 0 to the Building Regulations.
  • Thermal conductivity: 0.035 W/mK.

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