ICAA Insulator key terms

A measure of how well a material resists heat flow, expressed in square feet times degrees Fahrenheit times hours per Btu. Higher R-values mean better thermal performance, so both material choice and installed thickness matter.

The thermal conductivity of an insulation material: the Btu of heat passing per hour through one square foot of one-inch-thick material per degree Fahrenheit of temperature difference. Lower k-values indicate better insulating performance.

A path where heat bypasses the insulation through a more conductive component, such as a hanger, stud, or uninsulated fitting. Bridging lowers the effective R-value of the whole assembly.

Insulation spun from molten rock, slag, or glass into fibrous wool. It is noncombustible, tolerant of high temperatures, and widely used on pipes, vessels, and ducts where fire resistance is required.

A rigid insulation made of sealed glass cells, so it absorbs essentially no water vapor. It suits cold piping, underground lines, and chemical plants, but it is brittle and needs careful handling and joint sealing.

A rigid closed-cell foam board with high R-value per inch, commonly faced with foil or ASJ. It performs well on cold and moderate-temperature piping and ducts but has temperature limits that must be checked.

A flexible, closed-cell rubber-like insulation supplied in tubes and sheets. It bends around fittings and is common on chilled-water and refrigerant lines where condensation control and a built-in vapor retarder are needed.

A rigid, chalky-white insulation for high-temperature service on pipes, boilers, and vessels. It withstands temperatures that melt foam materials and is often used with metal jacketing and expansion provisions.

A listed system of sealant, putty, or collar used to restore the fire rating of a wall or floor where pipes, ducts, or cables pass through. Insulation often must be cut back or protected at the penetration.

The gloves, eye protection, hearing protection, hard hat, and clothing a worker wears to reduce exposure to job-site hazards. It supplements, but never replaces, engineering and work-practice controls.

A device worn over the nose and mouth to filter dusts, fibers, or vapors. Selection, fit testing, and medical clearance are required under a written respiratory protection program when hazards cannot be controlled otherwise.

Any product containing more than one percent asbestos. Before disturbing suspect insulation, a qualified person must test or presume it, and licensed abatement may be required before work can proceed.

An area with limited entry and exit that is not designed for continuous occupancy, such as a tank, pit, or vault. Entry requires atmospheric testing, an attendant, and a permit.

The procedure for isolating energy sources, whether electric, steam, pneumatic, or hydraulic, before work begins. Each worker applies a personal lock so equipment cannot be re-energized unexpectedly.

The right-to-know program requiring labels, safety data sheets, and training for hazardous chemicals on site. Insulation adhesives, mastics, and coatings all fall under it.

Systems and practices that prevent workers from falling from heights, such as guardrails, personal fall arrest, and safe ladder use. It is required above the trigger height set by the applicable standard.

A fine dust released when cutting or grinding concrete, masonry, or some board products. Inhalation can cause silicosis, so wet cutting, dust collection, and respirators are common controls.

Cleaning and conditioning the substrate, removing dirt, rust, oil, and loose material, before insulation, coating, or adhesive is applied. Proper preparation is what allows the system to bond and perform.

A thin coating applied to a prepared surface to improve adhesion, seal a porous substrate, or inhibit corrosion before insulation or mastic is installed. The specification usually names the product and dry time.

A brushable or sprayable adhesive used to bond jacket overlaps and seal the longitudinal and circumferential joints of ASJ or foil-faced insulation, keeping the vapor retarder continuous.

A material with low permeance that slows the movement of water vapor into insulation. It is placed on the warm side of the system to prevent condensation inside the assembly.

A number describing how much water vapor passes through a material, in grains per hour per square foot per inch of mercury. Lower numbers mean greater resistance to vapor flow.

The temperature at which air becomes saturated and water vapor begins to condense. Keeping the insulation surface temperature above the dew point prevents sweating on cold pipes and ducts.

A factory-applied laminate of foil, fiberglass scrim, and kraft paper on pipe insulation. It acts as a vapor retarder and a finish, and its joints are sealed with adhesive or tape.

Aluminum or stainless steel sheet wrapped over insulation to protect it from weather, abuse, and ultraviolet light. It is rolled, crimped, and banded, and needs expansion allowance on hot lines.

A plastic jacket used mainly indoors over insulation on cold lines, where it provides a clean, washable finish and a second vapor barrier. Joints are solvent-welded or taped.

A thick coating brushed or sprayed over insulation or jacketing to seal it against moisture and air. On cold systems it serves as the vapor retarder; multiple coats may be specified.

A gap or flexible element built into insulation to absorb movement of the pipe or equipment as it heats and cools, preventing buckled jacketing and cracked insulation.

A flexible, reusable insulation pad, often with a fabric or metal outer cover and fasteners, used on valves, flanges, and equipment that must be accessed for maintenance.

Factory-made cylindrical sections, often hinged or split, sized to specific pipe diameters and installed with staggered joints and secured with bands, wire, or adhesive.

A flexible blanket insulation applied to the outside of ducts to reduce heat gain or loss and control condensation. It is secured with pins or adhesive and finished with a vapor retarder.

Electric cables or tubing that add heat along a pipe to keep fluids from freezing or losing viscosity. Insulation is applied over the tracing, and the two must be designed together.

Cutting, forming, and pre-assembling insulation components in a controlled shop before delivery to the site. It improves accuracy and productivity, especially for fittings, tanks, and repetitive assemblies.

The process of measuring and listing every item of insulation, jacketing, and accessory from the drawings and specifications so quantities can be priced and ordered.

An estimate of the work hours needed to install one unit of a specific item, such as per linear foot of pipe or per square foot of board. Productivity factors adjust it for site conditions.

Product data, samples, and shop drawings sent to the designer for approval before installation. Approved submittals document that the materials and methods meet the specification.

The written portion of the contract documents describing materials, thicknesses, installation methods, and quality requirements. It works with the drawings and generally governs where the two conflict.

Model regulations such as the IECC or ASHRAE 90.1 that set minimum insulation levels and system requirements for buildings. Local adoption determines which edition and amendments apply.

A list of incomplete or deficient work compiled near the end of a project. Closing out punch items is usually required before final payment and acceptance.