by | Apr 15, 2024 | Glossary | 0 comments

Parge Coating: Parging

Parge coating or parging refers to the addition of a thin layer of mortar or cementitious material applied to the interior or exterior surface of a masonry wall. Its primary purpose is to improve the aesthetics of the wall surface, but it also offers several functional benefits, including enhanced thermal comfort, improved air tightness, and better building acoustics.

Here’s how parge coating contributes to these aspects:

Improved Thermal Comfort

Parge coating can serve as an additional layer of insulation, reducing heat transfer through the wall, improving the U-Value. By filling in gaps and cracks in the masonry and providing an extra thermal barrier, it helps improve the overall insulation properties of the wall assembly. This results in a lower U-value, which indicates better thermal insulation and, consequently, improved thermal comfort inside the building. Learn more about SAP Calculations by clicking here.

Enhanced Air Tightness

Parge coating helps to seal small cracks and imperfections in the masonry substrate, thereby reducing air leakage through the building envelope. By creating a smoother, more continuous surface, it minimizes the infiltration of outdoor air and the exfiltration of conditioned indoor air. Improved air tightness leads to better energy efficiency by reducing the load on heating and cooling systems and enhances occupant comfort by preventing drafts and maintaining consistent indoor temperatures. Learn more about Air Tightness by clicking here.

Better Building Acoustics

Parging, the application of parge coating can also contribute to improved building acoustics by dampening sound transmission through the wall assembly. The dense and uniform surface created by the coating helps to absorb and scatter sound waves, reducing the transmission of noise from the exterior and between interior spaces. This results in a quieter and more comfortable indoor environment, particularly in urban areas or buildings located near busy roads or noisy environments. Learn more about Sound Insulation Testing by clicking here.


In building compliance testing, parge coating may be evaluated for its impact on thermal performance, air tightness, and acoustic properties as part of overall building envelope assessments. Standards and regulations related to energy efficiency, such as building energy codes, often include requirements or recommendations for improving insulation, air sealing, and noise control, making parge coating a valuable component in achieving compliance with these guidelines. Contact us today to learn more.