Joints and Mortar: No Cement Allowed

A brick wall undergoing repointing. The old cement mortar joints are carefully chiseled out and replaced with lighter-colored, looser lime mortar, with the joint depth slightly recessed from the brick surface. Some areas still retain the untreated cement joints for comparison. White efflorescence marks on the brick surface are being treated. Avoid: using high-strength cement mortar for repointing, making the mortar joints protrude beyond the brick surface, extensively grinding the brick surface with a polisher, ignoring the causes and treatment of efflorescence and wall cancer.

Translated from Chinese by AI.

一面正在重新勾縫的磚牆。舊的水泥填縫被小心鑿除,換上顏色較淺、質地較鬆的石灰砂漿,縫的深度略凹於磚面。局部區域還留著待處理的水泥縫作為對照。磚面上有鹽析的白痕正在處理。避免:使用高強度水泥砂漿勾縫、把灰縫做得比磚面凸出、用磨光機大面積打磨磚面、忽略鹽析與壁癌的成因處理。