It seems there might be a slight confusion in your question. The term "veneer" typically refers to a thin layer of material, such as wood or stone, used to cover another surface, often for decorative purposes. However, in the context of construction and mortar, "veneer" may not be the correct term.
If you are referring to the best material to use for mortar in construction or masonry work, then the most common and widely used mortar types are based on cement. The choice of mortar depends on the specific application and requirements of the project. Here are some common types of mortar used in construction:
Portland Cement Mortar (Type M, Type S, Type N, Type O): This is the most commonly used mortar and is suitable for general masonry work. Different types are available, with varying proportions of cement, lime, and sand, offering different strengths and workability.
Masonry Cement Mortar: This is a pre-blended mortar mix that already contains the appropriate proportions of cement, lime, and sand. It is convenient to use and ensures consistent quality.
Lime Mortar: Lime mortar is made by mixing lime, sand, and water. It is commonly used in historical restoration projects or for buildings constructed with soft or historic bricks. Lime mortar allows for more flexibility, which can be beneficial for certain types of masonry.
Mortar with Additives: Some construction projects may require special additives in the mortar to enhance specific properties like strength, workability, or waterproofing.
The choice of mortar depends on factors such as the type of masonry units being used (bricks, stones, blocks), the climate and environmental conditions, the structural requirements, and any historical preservation considerations.
If you meant something else by "veneer" in your question, please feel free to provide more context or clarification so that I can better address your inquiry.