You are holding the 17th edition of Pakistan's "Building Resource Book" — the product of over 19 years of continuous research, dedication, and effort by our hardworking team. This edition stands as a comprehensive reference for anyone involved in construction materials and the building industry. It has gained recognition not just from professionals—such as architects, engineers, and builders—but also from first-time home owners and aspiring home builders seeking trusted guidance. The Building Resource Book (BRB) has firmly established itself as an essential guide for both design and construction. Its credibility has been built on consistent feedback, market insights, and unwavering support from our readers and contributors. Despite the unprecedented challenges posed by COVID-19, we are grateful to all the companies that continued to support and participate in this edition. Your trust has been instrumental in our growth, and we look forward to your continued collaboration in future publications. We are especially thankful for the kind words and recommendations from: Muhammad Arif Changezi, Honorable Chairman, Pakistan Council of Architects and Town Planners (PCATP) President, Institute of Architects Pakistan Dr. Javed Younas Uppal, President, Institution of Engineers Pakistan Your encouragement fuels our mission, and we remain committed to evolving and improving the BRB for the benefit of the entire industry.