Flat Roof Insulation Requirements

Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses.

Flat roof insulation requirements.

It is top quality and the most cost effective product for your flat roof. Insulation is placed in between the joists underneath the roof surface. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines.

Mineral wool rolls are ubiquitous and cheap meaning a whole roof on a standard home could be insulated to the recommended 270mm with a spend of little more than 200. The material that works best depends largely upon preference in a given situation. Be able to provide support for or. We recommend having at least 20 r value worth of material for optimal energy efficiency.

There are two main types of flat roof that require different approaches to installation. There must be a slope of 1 80 part h of the building regulations regarding drainage state that water should drain to one or two edges waterproofing should extend up the adjacent walls at least. The insulation material for a warm flat roof should. Be durable and suitable for external use.

If insulation is installed below the flat roof deck this is called a cold roof. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. While expensive the best insulation is polyiso rigid foam. Insulating a roof is perhaps the easiest of all the energy saving home improvements.

For a 1 inch board equivalent of 6 r value. Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc 2004 2007 2010 2013 2016 2009 2011 2014 2012 2015 2009 2012 2015 0 25 1 15 20 2 15 20 25 3 15 20 25 4 15 20 302535 5 15 20 302535 6 15 20 3035 7 15 20 3540 25 8 20 3540 25 minimum r value non residential above roof deck. From there the flat roof system you choose will determine the materials you apply. Be able to cope with extremes of temperature and uv light without deterioration in thermal performance.

It s also within the capability of most diyers although not the most pleasant of tasks. Be able to resist pressure from any anticipated foot traffic. Consider geography budget and use for the roof to determine the best option. You can expect to pay about 55 100 sq ft.

Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane. A note to consider before construction.