Flat Roof Condensation Risk Analysis

Flat roofs are among the simplest construction elements that can feature in a building.

Flat roof condensation risk analysis.

Condensation risk analysis for individual elements performed in accordance with bs 5250. 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. 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. 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 type of roof has normally been used over small extensions to dwellings using timber joists and plywood deck. Get an interstitial condensation risk analysis carried out. A condensation risk analysis is unable to allow for varying standards of workmanship but a high. Get an interstitial condensation risk analysis.

2002 are supplied free of charge alongside u value calculations produced by kingspan insulation s technical services department. As long as the roof accords with good practice then a more complex calculation method should not be necessary. 2006 and bs en iso 13788. 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 warm roof features a structural deck vapour control layer insulation and waterproofing a tried and tested solution that the industry knows works. The analysis will determine the dew point and you can check where the condensation is happening in the report. This is something we do for all our new roofs as well as part of our design service. For example insulation designed for use in an adhered system is required to undergo external testing with individual membrane manufacturers.

A condensation risk analysis is then provided to justify this stance. 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.