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Trisobuild® RWL/ R

Site assembled roofing systems.


Site assembled roofing system with internal and external profiles which offer design flexibility, a choice of perforated liner for acoustic applications and a depth of 19–32 mm.

The Trisobuild® systems can be tailored to meet project requirements including thermal and acoustic performance. The system comprises of a Colorcoat® pre-finished steel trapezoidal liner profile, a Instaloc® Plus spacer system, an insulation layer and a Colorcoat® pre-finished steel external weathering profile.

The roof and walkable liner (R and RWL) systems are fully compliant with ACR non-fragility standards. The systems can be adapted to suit a wide range of U-value performances with proven air-tightness that meet and surpass all Building Regulation requirements.

Available with a walkable liner option and also a range of glass-reinforced plastic (GRP) in-plane rooflight options to provide natural diffused daylight into the building.

Features and benefits:

  • Certified 'very good' to Building Research Establishment (BRE)'s responsible sourcing standard BES 6001.
  • Platinum® Plus is a system guarantee for up to 30 years, derived from a tailored specification to suit project requirements.
  • Loss Prevention Certification Board (LPCB) LPS 1181-1 approved 460a 14, 15, 19, 23 and 31.
  • The insulation within the system has both zero ozone depletion potential (ODP) and low global warming potential (GWP). Both these factors support the achievement of a high Building Research Establishment Environmental Assessment Method (BREEAM) rating.
  • All steel elements are recyclable, without any loss of quality. The insulation can be separated easily and if kept ‘clean’ can be recycled. An environmental product declaration (EPD) is available for all Trisobuild® systems.


Site assembled roofing systems.

General information

Uniclass 2015

Pr_25_71_14_22 Carbon steel insulating sandwich panelsPrimary


H43/10 Metal insulating sandwich panel

H43/120 Metal insulating sandwich panel

Specification data - Carbon steel insulating sandwich panels

Product Reference

Trisobuild® R Roof System

Uses LP1000 0.4 mm liner. 1.8 m span (maximum). Class C non-fragile.

Trisobuild® RWL Roof System With Liner

Uses walkable RL32 0.7 mm liner. 2 m span (maximum). Class B non-fragile.

Instaloc® Plus bracket height

140 mm

Insulation depth: 40 mm. U-value 0.30 W/m²K (R system). 0.32 W/m²K (RWL system).

160 mm

Insulation depth: 160 mm. U-value 0.26 W/m²K (R system). 0.28 W/m²K (RWL system).

180 mm

Insulation depth: 180 mm. U-value 0.24 W/m²K (R system). 0.22 W/m²K (RWL system).

200 mm

Insulation depth: 200 mm. U-value 0.21 W/m²K (R system). 0.20 W/m²K (RWL system).

220 mm

Insulation depth: 220 mm. U-value 0.19 W/m²K (R system). 0.18 W/m²K (RWL system).

240 mm

Insulation depth: 240 mm. U-value 0.18 W/m²K (R system). 0.18 W/m²K (RWL system).

260 mm

Insulation depth: 260 mm. U-value 0.16 W/m²K (R system). 0.17 W/m²K (RWL system).

280 mm

Insulation depth: 280 mm. U-value 0.15 W/m²K (R system). 0.16 W/m²K (RWL system).

300 mm

Insulation depth: 300 mm. U-value 0.14 W/m²K (R system). 0.15 W/m²K (RWL system).


As drawing

Insert details.

Material/ Finish


External facing

Coloroat HPS200 Ultra® pre-coated steel

Coloroat Prisma® pre-coated steel

Internal facing

Coloroat® High Reflect steel

PE15 steel


Consult technical literature for details and insert requirements.

Standard product features

Span arrangement:

Double span.

Reaction and resistance to fire:

  • All Trisobuild® R/ RWL systems when used as a roof achieve a Grade AA rating in accordance with BS 476-3 and B roof (T4) in accordance with EN 1187.
  • All Trisobuild® R/ RWL systems have an internal reaction to fire classification of A1.

Thermal performance:

All quoted system U-values and construction ‘psi’ and f values have been computer modelled in accordance with EN ISO 10211 as stated in the Metal Cladding and Roofing Manufacturers Association (MCRMA) Technical Note 14 by trained and experienced technical engineers.

U-Values are based on secondary steelwork support at 1.8 m centres, 1.2 m bracket spacing and insulation with a 0.040 W/mK thermal conductivity.

Water penetration:

All roof systems are capable of being laid at a 4° roof pitch (with the exception of the 13.5/3 profile which is limited to 10°) following guidelines provided by the MCRMA technical paper 15.

Third party certifications
  • Loss Prevention Certification Board (LPCB): Certificate: LPS1181 Part 1 : 460a, 14, 15, 19, 23, 31
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