Renovation plans? Discover the benefits of roof sarking


If your roof isn’t properly insulated yet, now is the time to get the job done. One insulation method definitely worth looking into for sloped roofs is sarking, where insulation boards are installed on top of the rafters instead of in between them. In other words, you’d be insulating your roof from the outside. Read on to learn more about this interesting insulation method and the benefits it offers.

What is roof sarking?

Roof sarking consists of installing insulation on the top of the supporting construction (i.e. on the rafters). This explains why sarking is a popular insulation method for renovations, as there is no need to alter the existing interior finishing. Roof sarking is usually done in five steps:

  1. The existing roof covering (tiles or slates and the trellis) is removed. Any insulation material that is already there remains untouched.
  2. A vapor screen is applied. This step is crucial to prevent condensation problems.
  3. New insulation, e.g. SOPREMA’s PUR and PIR boards, is installed on top of the vapor screen. The roof’s insulation shield is now complete.
  4. Next, under roof insulation film is applied to the insulation, after which the trellis is reapplied.
  5. Finally, new tiles or slates are laid onto the trellis and your newly renovated roof is all set!

Four advantages of roof sarking?

Roof sarking doesn’t come cheap, but you do get plenty in return:

+ If there’s no room for (additional) insulation on the inside of your home or if you’ve been meaning to replace your roof covering anyway, roof sarking is the solution par excellence.

+ Taping insulation boards on the seams creates an uninterrupted and airtight insulation shield which significantly reduces the chance of thermal bridges.

+ The added insulation better protects the wood structure of the roof.

+ Roof sarking can be installed relatively quickly.

Want to learn more about roof insulation? Don’t hesitate to contact our experts.