the term "Reduced Level" (RL) refers to a vertical measurement that indicates the height of a specific point relative to a predetermined reference point, often known as a datum. This datum is typically a known point of elevation, such as the Australian Height Datum (AHD), which is a standardized reference level across Australia.

In the context of Australian commercial construction projects, "rake" typically refers to the angle or slope of a surface. This term is often used when discussing the incline of roofs, ceilings, or other structural elements. For example, a "raked ceiling" would have a sloped design rather than being flat. The rake is an important consideration in construction as it affects both the aesthetic and functional aspects of a building, including drainage, structural integrity, and interior space dynamics. Understanding and specifying the correct rake is crucial for architects, engineers, and builders to ensure that the design meets both regulatory standards and the client's requirements.

a rainwater head, also known as a rainwater sump, is a component of a building's roof drainage system. It serves as a collection point for rainwater from the roof before it is directed into downpipes and subsequently into the stormwater drainage system.

a "rafter" refers to a structural component of a roof. Rafters are inclined beams that extend from the ridge or hip of the roof down to the wall plate, eave, or outer wall. They are an integral part of the roof framing system and are responsible for supporting the roof deck and its associated loads, such as roofing materials, insulation, and any additional weight from snow or maintenance activities.

Polyvinyl Chloride (PVC) is a widely used synthetic plastic polymer in Australian commercial construction projects, as well as globally. It is valued for its versatility, durability, and cost-effectiveness.

a "Provisional Sum" refers to an estimated allowance included in a contract for certain work or materials that cannot be precisely specified at the time of contract signing. This sum is typically used for elements of the project where the scope is not fully defined or where there is uncertainty about the cost.

a property survey is a detailed and precise assessment of a piece of land or property. It involves the measurement and mapping of the land's boundaries, features, and topography. The primary purpose of a property survey is to establish legal property lines, identify any encroachments or easements, and provide essential data for planning and development.

In Australian commercial construction projects, a prime or priming coat refers to the initial layer of coating applied to a surface before the application of additional coats of paint or other finishes. This preparatory coating is designed to create a strong bond between the surface and subsequent coatings, ensuring a durable and long-lasting finish

a Prime Cost Sum (PC Sum) refers to an allowance in the contract for the supply of materials or equipment that have not yet been selected or whose exact cost is not known at the time the contract is signed. This sum is included in the contract to cover the anticipated cost of these items, but it is an estimate rather than a fixed price.

a Pressure Relief Valve (PRV) is a safety device designed to protect a pressurized system or vessel from exceeding its maximum allowable pressure. The primary function of a PRV is to automatically release excess pressure from a system when it reaches a predetermined set point, thereby preventing potential equipment failure, explosions, or other hazardous situations.

Prefabricated construction refers to a type of construction where a building's components are constructed off-site . This method involves manufacturing or assembling components, such as walls, floors, and roofs, in a factory or other manufacturing site, and then transporting them to the construction site for assembly

See "Pre-cast"

pre-cast concrete refers to a type of construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment . This process allows for the creation of high-quality concrete elements, such as foundations, walls, and floors, that can be transported to the construction site and lifted into place .

See "cement (portland)"

a portal frame is a type of structural system commonly used for building large, open spaces such as warehouses, factories, and retail outlets. It is characterized by its rigid connections between the columns and the rafters, forming a stable and efficient framework that can span long distances without the need for internal supports.