Flat Roof Insulation Requirement

Another major performance issue with insulation and energy savings is its air sealing capability.

Flat roof insulation requirement. Insulation for flat roofing is used to make a structure more energy efficient and minimise heat loss. What is flat roofing insulation. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. The tables below show the suggested u values in england wales and scotland.

The higher the r value the better the insulation. Recommended home insulation r values. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. Insulation ratings are measured in r values per inch of thickness.

An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Laying flat roof insulation. There are many options available to fulfil this requirement as you will find out below. This will help to conserve energy and ensure thermal comfort is maintained within the building.

As a rule any roof with a pitch below 10 is classified as a flat roof. Cold roofs and warm roofs. Insulation level are specified by r value. The higher the r value the better the thermal performance of the insulation.

R value is a measure of insulation s ability to resist heat traveling through it. Insulation r values vary based on the type thickness and density of the insulation material. 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. Flat roof insulation.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. See the department of energy s doe ranges for recommended levels of insulation below. There are two types of flat roof. The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.

In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.