The variability of the thermal conductivity value - is the real world different from the technical specs?

May 13, 2020 2020-05-13 2020-05-13 The variability of the thermal conductivity value - is the real world different from the technical specs? OBEC Canada America/New_York


Wednesday, May 13, 2020

The Ontario Building Envelope Council is pleased to announce a new series of educational webinars in addition to our traditional monthly presentations.

Constant thermal conductivity values of insulating materials are typically used in building design and assessment. However, the thermal conductivity depends on many factors, such as on the temperature and moisture content within the material. This is critical in porous materials like the insulating ones. Linear temperature-dependent laws have been occasionally proposed for inorganic fibrous materials such as fiberglass or rock wool that exhibit a decreased thermal conductivity (better performance) at low temperatures. However, the petrochemical-foamed insulating materials such as the polyisocyanurate, have less regular temperature-dependent behaviors with a poorer performance at both extremely cold and warm temperatures. This means that the use of constant thermal conductivity values results in actual building envelope performance different from the design predictions, with increasing building energy consumptions, greater risks of condensation issues, and decreased occupants’ comfort.

This seminar aims to quantify the impact of the temperature dependency of the thermal conductivity in exterior walls and flat roofs. Common insulating materials will be taken into accounts, such as fiberglass, rock wool, polyisocyanurate, and polystyrene.

Follow this seminar to learn how critical is the increase in the energy fluxes from common building envelopes once the effective (real-field) thermal conductivity is considered.

Speaker: Dr. Umberto Berardi

Dr. Umberto Berardi, Associate Professor and BeTOP Lab Director at Ryerson University, Faculty of Engineering and Architectural Science will be presenting on the topic of Variability of Thermal Conductivity Values and will highlight the impact of temperature dependency on common building materials and their performance in real world applications.


Member/OAA Member: $28.00 plus HST
Non-Member: $28.00 plus HST
Student: $10.00 plus HST

We realize that the COVID-19 pandemic has resulted in financial hardship for many people at this time. If you feel you are not able to contribute to the registration cost for this webinar but want to participate in this professional development opportunity please send us a message to be accommodated at no cost, space permitting.


Event qualifies for 1 BSS Credit | 1 OAA Core Learning Hours