- 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
Solutions for your flat roofing problems
Is your flat roof leaking? Are you looking for the perfect flat roof covering for a new project? Or maybe you just want reassuring about an existing roof? Whatever your needs we can help. See an overview of our services below and click for more details.
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.
EXCELLENT SERVICE AND CUSTOMER SUPPORT.
The contractors were very professional and courteous. They made everything clean and tidy before they left.
Tidy, efficient, professional, competent staff who cleaned up at end of each day.
Both the salesman and fitter were on time, courteous and the quality of work was very satisfactory.
Very pleased with everybody at De Rosa. They were Professional and pleasant people to deal with. They did exactly what they said they would do, on time and without fuss. No hesitation in recommending De Rosa.
They are a first class firm that are very prompt and they have exceptional workers.
They are excellent workers.
Great service, fitting team great and courteous would definitely recommend. Booked further work to be carried out.
The workers were very polite and did a brilliant job.
The work was carried out over 2 days as promised, despite inclement weather. The workmen were pleasant and courteous, worked hard to get the job done on time and left everywhere clean and tidy. I would definitely recommend De Rosa Installations.
• 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.