Abstract: Nowadays there is a huge trend on using timber roof structure with traditional joineries in hotels constructions because of its advantages like flexibility, durability, beautiful appearance, strength, eco-friendly, energy efficient, and aesthetical freedom. The king post and beam joinery is one of traditional timber joinery that commonly used when designing cabanas, summer houses, greenhouses and lobby in hotels. There is a standard measurement system is used by carpenters when design a roof structure and one of the basic measurements is the distance between two king-post trusses. Generally, carpenters in Sri Lanka use 8-10 feet as the range for the distance between two king-post trusses.