• Proven to last over 50 years
  • Insurance Backed Guarantees
  • No Splits, Cracks, or Blistering
  • Aesthetically Pleasing
  • No Moss or Plant Growth
  • Approved Installers For 17 Years
  • Solar Reflective
  • Environmentally Friendly
  • Vapor Permeable

About De Rosa Installations

We have been installers of Sarnafil single ply membranes for 18 years and hold an abundance of knowledge in the area of flat roofing. This gives us a greater understanding  of what our customers require in order  to achieve their needs. We believe the Sarnafil membrane offers homeowners the perfect solution for any flat roofing project they’re undergoing. We put our complete trust in the Sarnafil flat roofing system and can assure our customers can do the same with us.

Flat roofs are usually an area of concern for any homeowner and if a problem should ever occur it is definitely worth addressing immediately as the damage can be catastrophic.  There are usually a few tell tale signs that your flat roof is failing these could be, cracks, blisters, standing water or damp showing inside your property. If any of these should occur please don’t hesitate to contact us as our advice is free.

Warm Roofs

• In a warm roof the thermal insulation is immediately below the membrane finish.

The structural deck, any voids and the ceiling are at a temperature close to that of the building’s  interior.

• Condensation control is achieved by using a vapour control layer (VCL) on the warm side of the  insulation.

• The amount of insulation should be enough to maintain the VCL above dewpoint temperature.

• Warm roof voids are not ventilated.

In a warm roof construction the Sarnafil membrane and insulation is installed above the structural decking. In principle this keeps the structural deck (usually trapezoidal steel or timber) at more or less the same temperature as the inside of the building A vapour control layer is required underneath the insulation in to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof construction (interstitial condensation).

Warm roofs are generally considered as very effective for energy use reduction and building performance.

However the thermal insulation type and thickness is critical.

If you have any questions please don’t hesitate to contact us and speak to one of our specialists.