Abstract
There is a need of upgrading the old building stock with respect to the thermal insulation of the building envelope and specifically the façades. There are several systems on the market, and some are quite new and innovative. To bring down the cost some of the systems many are based on prefabricated moisture tight insulated units. This means that in case there is moisture tight barrier on the interior side, two moisture tight barriers surround the wall structure. The leakage of driving rain into the structure then represents a major threat to the durability of these systems. This paper investigates the pressure build up in water rivulets running down a façade acting together with the wind pressure. A driving rain leakage potential is introduced. Using real weather data years and Monte Carlo Simulations, the mean and standard deviation of the annual leakage through small hole is estimated. The examples show that the leakage can reach a level 0-0.5 liter/year for a hole with a diameter of 1-2 mm, and 0.5-3 liter/year for a diameter of 3-4 mm.
Highlights
One of the main functions of the exterior walls is to separate and protect the indoor from the outdoor climate to provide an energy efficient building with good indoor environment
The risk of rain intrusion is greater in the presence of façade details than in an unimpaired wall since inward leakage often occurs in correspondence to the joints around façade details
There is a need of upgrading the old building stock with respect to the thermal insulation of the building envelope and the façades
Summary
One of the main functions of the exterior walls is to separate and protect the indoor from the outdoor climate to provide an energy efficient building with good indoor environment (thermal comfort, shading from sun and rain etc.). Joints around window-wall interfaces are one of the most common façade details, and windows often make up a relatively large proportion of the façade area For this reason, the façade material itself is impervious to rain, the wall itself may still be damaged due to leaks around façade details [13]. The façade material itself is impervious to rain, the wall itself may still be damaged due to leaks around façade details [13] Research in this area has newly been performed to offer more data and to quantify and understand the amount of leakages [10] basically to design and assess new and existing solutions, in a reliable manner. This means that in case there is moisture tight barrier on the interior side, two moisture
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