热桥（TB）是指建筑组件的一部分，其传导传热速率高于建筑外壳的相邻组件。它们通常是高导电性建筑组件中断绝缘的结果。热桥在建筑外壳中很常见，表1.1列出了住宅和商业建筑中最常见的一些热桥。本研究项目的目标有四个方面:-评估两种常用墙体组件的热性能（U系数）及其热桥特性；-评估设计和施工方法（尤其是护套），以改善热桥接的影响评估当前预测建筑类型和热桥接U值的方法； 和-开发新的或修改现有的计算方法。

Thermal bridge" (TB) is the term describing that part of a construction assembly which has a higher rate of conductive heat transfer than the adjacent components of the building shell. They are most often the result of high-conductivity construction components interrupting insulation. Thermal bridges are commonplace in building shells, and Table 1.1 lists some of the thermal bridges most commonly found in residential and commercial construction.The objectives of this research project are fourfold:- to evaluate the thermal performance (U-factors) of two commonly used wall assemblies and their thermal bridge characteristics;- to evaluate design and construction methods (in particular, sheathing) to ameliorate the impact of thermal bridging;- to evaluate current methods of predicting U-values of construction types and thermal bridging; and- to develop new or revise existing calculational methods.