Knauf Insulation Warm Flat Roof
Flat Roof - Warm Roof
Flat Roof Mechanically Fixed Single Ply

APPLICATION OVERVIEW

Mechanically fixed, single ply build-ups consist of a system that is held in position by mechanical fasteners alone. These secure the membrane over the top of the insulation and VCL, and are fastened in place into the roof deck. Mechanically fixed single ply is suited to applications where speed of installation is key, such as schools.

Our insulation solutions for flat roofs provide both excellent fire and acoustic performance in addition to high levels of thermal performance.

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RECOMMENDED PRODUCTS

Why Mineral Wool?

  • Mineral Wool provides the best combination of thermal, fire safety and acoustic performance.

  • When manufactured using Knauf Insulation's Krimpact® Technology it provides high levels of compressive strength and durability. It is also non-combustible, with the best possible Euroclass A1 reaction to fire classification.

Download our Solutions Guide 

Typical U-values

Using Rocksilk® Flat Roof Slab with Single Ply Membrane

 U-value (W/m2K)
Rocksilk® Flat Roof Slab thickness (mm)
  • 150mm concrete
  • 40mm screed
  • 13mm plaster
Profiled metal deck
  • 19mm OSB
  • 100mm timber joists
  • 12.5m standard plasterboard
360 (2x180)0.110.110.10
325 (180+145)0.120.120.13
290 (2x145)0.130.130.12
245 (145+100)0.150.160.15
200 (2x100)0.190.190.17
1800.210.210.19

Typical U-values

Using Rocksilk® Flat Roof Slab Extra with Single Ply Membrane

 U-value (W/m2K)
Rocksilk® Flat Roof Slab thickness (mm)
  • 150mm concrete
  • 40mm screed
  • 13mm plaster
Profiled metal deck
  • 19mm OSB
  • 100mm timber joists
  • 12.5m standard plasterboard
300 (2x150)0.130.130.12
275 (150+125)0.140.140.13
250 (2x125)0.150.160.14
230 (125+105)0.170.170.15
210 (2x105)0.180.190.17
190 (2x95)0.190.210.18
For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766666.
For written U-value calculations, please complete our contact form by clicking here, including details of your full through construction build-up and we will respond accordingly to meet your requirements.