In order to predict any potential condensation before installing insulation a condensation risk analysis can be performed.
Flat roof condensation risk analysis.
For a flat roof construction be it a cold roof a warm roof or a warm inverted roof the calculation method for year round condensation risk set out in bs en iso 13788 known as the glaser method is almost always sufficient.
However doing so increases the risk of condensation forming on the elements not surrounded by insulation such as cold roof decks.
A condensation risk analysis is unable to allow for varying standards of workmanship but a high.
In addition the various components of a flat roof assembly must be compatible with each other to ensure the roofing system is durable and reduces the risk of future defects and system failure.
A flat roof should be designed to minimise condensation and a condensation risk analysis should be undertaken taking into account positioning of insulating materials vapour control layers ventilation thermal insulation and the choice of materials.
This is something we do for all our new roofs as well as part of our design service.
A warm roof features a structural deck vapour control layer insulation and waterproofing a tried and tested solution that the industry knows works.
As long as the roof accords with good practice then a more complex calculation method should not be necessary.
The cold deck solution.
Because the waterproofing layer constitutes a vapour control layer on the cold side of the insulation there is a high risk of harmful interstitial and surface condensation on the underside of the deck or the upper surface of the.
For example insulation designed for use in an adhered system is required to undergo external testing with individual membrane manufacturers.
There are two forms of flat roof construction which can reduce the risk of condensation forming.
Get an interstitial condensation risk analysis.
In the above example of a condensation risk analysis the top line t represents temperature and the bottom line d represents the material s predicted dewpoint temperature which varies with the amount of moisture in the air in high humidity conditions a material s dewpoint temperature is increased.
Get an interstitial condensation risk analysis carried out.
Flat roof refurbishment best.
Determining the risk of interstitial or surface condensation in a building depends on the components of the assembly the order in which they appear in the construction the building s use and its.
This problem may become more common as existing buildings are altered to become eco friendly.
For example a condensation risk analysis will assume that any vapour control layers are installed to a perfect standard of workmanship and are not penetrated by.
Unfortunately a condensation risk analysis makes certain assumptions that may not reflect real life conditions.
Flat roofs are among the simplest construction elements that can feature in a building.
