Construction, Materials, and Specifications
Specifications and MasterFormat
Specifications are the written half of the contract documents and are organized by MasterFormat divisions, which group work by trade and material rather than by building sequence. Divisions you must recognize: 03 Concrete, 05 Metals, 06 Wood, Plastics, and Composites, 07 Thermal and Moisture Protection, 08 Openings, 09 Finishes, 10 Specialties, 11 Equipment, 12 Furnishings, 21 Fire Suppression, 22 Plumbing, 23 HVAC, 26 Electrical, 27 Communications. Interior designers work most heavily in 06, 08, 09, 10, and 12.
Three-part format
Each section uses CSI three-part format: Part 1 General (scope, submittals, quality assurance, references, warranties), Part 2 Products (materials, components, fabrication, finishes), Part 3 Execution (installation, preparation, field quality control, cleaning). If a sentence describes how something is installed, it belongs in Part 3.
Types of specifications
Proprietary names a single manufacturer and model, appropriate when performance cannot otherwise be described. Performance describes required results and leaves means to the contractor. Reference cites an established standard. Most project manuals are hybrid, using “basis of design” products with “or equal” language and a substitution procedure.
Materials and assemblies
Understand finish compatibility and substrate requirements: gypsum board types (regular, moisture-resistant, fire-rated Type X), tile substrates and movement joints, wood veneer and laminate grades, resilient flooring and moisture testing, paint systems, and the fire-resistance-rated assemblies that walls and ceilings must match.
Traps
Questions confuse performance and proprietary specs, misplace content between parts, or assume the contractor selects finishes. Means and methods belong to the contractor; design intent and quality standards belong to the design professional.
Rule of thumb
Before filing any sentence, ask “is this scope, product, or installation?” - that determines Part 1, 2, or 3.