A prehung door is a door unit that comes already assembled with its frame, hinges, and often the hardware installed. It is delivered ready to be installed in an opening, simplifying the fitting process for new construction or remodel projects.
Unfaced insulation is a type of thermal insulation that lacks a vapor‑barrier facing. It is commonly used in applications where a separate vapor barrier is installed, or where moisture control is not a primary concern. The term refers to the material’s lack of an attached kraft paper or foil facing.
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In construction, NTP stands for Notice to Proceed, a formal written directive issued by the project owner or their representative authorizing the contractor to begin work. It marks the official start of the construction phase and triggers contractual obligations such as schedule commencement and mobilization.
5/4 lumber refers to lumber that is nominally 1 1/4 inches (31.75 mm) thick before surfacing. After planing, the actual thickness is typically about 1 inch (25.4 mm), making it a common choice for decking, furniture, and exterior projects.
Seasoned wood refers to timber that has been dried to a stable moisture content, making it suitable for burning, construction, or crafting. Proper seasoning reduces shrinkage, cracking, and improves energy efficiency.
A turnkey contract in construction is a delivery method where the contractor handles all phases—from design to commissioning—so the owner receives a fully operational facility ready for immediate use. It consolidates responsibility, offering predictable costs and reduced coordination risk.
S4S is an abbreviation for ‘surfaced on four sides,’ indicating that all four faces of a piece of lumber have been planed smooth. This process removes the rough exterior of the wood, resulting in a finished product with consistent dimensions.
In construction contracts, OFCI stands for Owner Furnished, Contractor Installed. It designates items supplied by the owner but installed by the contractor, outlining shared responsibilities.
In construction documents, “AFF” is a common abbreviation that usually stands for “Above Finished Floor.” It indicates a vertical measurement taken from the top of the completed floor surface. The term helps architects, engineers, and contractors communicate clear height references across drawings and specifications.