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The following criteria for job conditions and effects of lighting should be considered essential for a successful ceiling system installation (All criteria are taken from the Ceilings and Interior Systems Construction Association guidelines publication “Acoustical Ceilings: Use and Practice.” In addition, excerpts were taken from the CISCA “Code of Practices for Acoustical Ceiling Systems”):
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All windows and exterior doors shall be in place and glazed, and the roof shall be watertight prior to the start of the ceiling installation. This condition should be maintained prior to, during and after the installation.
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Acoustical materials are interior finish materials and as such are designed for installation within the normal occupancy condition range of 60 to 85° F at a maximum of 70% relative humidity.
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Final Appearance
The Fellert plaster system is designed to be an acoustical sound absorption system with architectural aesthetic design capabilities. The visual appearance is intended to be a monolithic and natural looking hand-crafted plaster. As a sprayed and hand troweled product, it allows sound to be absorbed while retaining an attractive, wall-to-wall seamless appearance.
The final appearance of either the Natural, Troweled or Ultra finishes will vary slightly throughout the expanse of the surface area, as with any hand-crafted plaster--especially under critical lighting conditions. As per the Fellert specifications an approved project mockup is required.
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Effects of Lighting
While considering job conditions which affect the appearance of the completed ceiling installation, it is advisable to consider that the lighting selected be of the type that will complement the ceiling rather than promote an adverse or unsatisfactory appearance.
The most critical factor is the direction of the light source. A critical horizontal light that strikes the ceiling surface at an acute angle accentuates normal ceiling irregularities, affecting the final appearance of the installation.
Exterior lighting from high windows and window walls can result in similar problems. Frequently, a ceiling may appear unsatisfactory during installation due to low angle daytime illumination; however, when the job has been completed with draperies or blinds and lighting fixtures in operation, the ceiling will provide a commercially acceptable appearance. |
