When it comes to the construction of buildings, one of the most important considerations is the protection of the structure from the elements. This is why exposures of buildings must be calculated carefully, in order to ensure that adequate weather protection is provided.

When it comes to protecting your building from the elements, External Render is the go-to choice. Our team of experts understands the importance of calculating the exposure of buildings to the force of wind and rain, and how this can be impacted by location, orientation and surrounding environment. 

External Render Exposure Map

See NHBC Exposure Guidelines 

Exposures of buildings are calculated using a method defined in cycles of wet and drying conditions called spells, and measured in litres/m²/spell. This method takes into account the location and orientation of the building, as well as the surrounding environment and its exposure to wind and rain. 

For sheltered to moderate exposures, it is recommended that the minimum finished render thickness should be 15mm. For severe elevations, a 20mm thickness is recommended. Acceptable tolerances of up to plus or minus 2mm should be taken into consideration when calculating the nominal applied thickness.

It is important to ensure that the minimum thickness is achieved at the lowest point of the building in order to provide the correct level of weather protection. This should be taken into account when considering Ashlar Cutting, and any design should be adjusted accordingly.

Taking all of these factors into consideration when calculating exposures of buildings is essential in order to ensure that the structure is adequately protected from the elements. With the correct application of these guidelines, buildings can be designed and constructed to properly withstand the elements, and last for years to come.