Suspended Ceiling
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Description
Chapter 24 Finish Ceilings & Floors
‘Interior’ Ceiling @ the Venetian Hotel (Las Vegas)
Functions of Finish Ceilings Visual - color, texture, pattern, shape Control diffusion of: light sound
Conceal MPE Accommodate: lights, diffusers, communication, sprinkler…
May assist with fire resistance distribution / return of HVAC
Types of Ceilings Exposed Structural & MPE Tightly Attached
Suspended Interstitial
Exposed Exposed Structure & MPE Industrial, warehouse, … Economy & ease of maintenance
Timber, trusses, etc. Often for appearance
Flat Plate, PC plank (HC) Painted - hotels & apartments Minimal MPE services in ceiling Economy and reduces story height
Exposed Structure Ceiling “Joint” Preparation for Sprayed on Textured Ceiling
Textured Ceiling
Exposed Timber & MPE Services @ a Ski Lodge
Tightly Attached Attached directly to joists or slabs Special arrangements / accommodations for: Structural members (beams, girders) MPE systems
Suspended Ceilings Suspended from the Structure Generally by wires Materials: drywall, plaster, fibrous (acoustic) Structure Ceiling Plenum space
Support Wires
for ducts, pipes, conduit ...
Support System •Metal Framing •Furring Channels •“Metal Grid
Suspended Ceiling •Drywall •Plaster •Acoustic (incombustible fibers)
Suspended Plaster Ceiling (note the delamination of the finish coat)
Acoustic “Lay-in Panels”
•Exposed Metal Grid •2x2 or 2x4 Lay-in Panels •MPE “sized” to fit grid or cut into the acoustic tile •Economical
Acoustical Ceiling Grid Systems
“Difficult” to access
Main Runners Cross Tees •Provide Main Ceiling Support •Intermediate Support •Generally 4’ o.c. •“Rest”/ attach to Mains •Attached to “Hangers” •Spacing depends on tile •Additional hangers may be required to support MPE “loads” Wall Angle •Attaches to wall
“Recessed” Grid (also can be Flush, …)
Ceiling mounted - lights, sprinkler, smoke detector, communication
Multiple Tile Finishes Available
Diffuser sized 2x2
Common Support Grid Profile
Suspended Ceiling used as a Fire Resistant Membrane Combination Light/Diffuser The Integrity of the Fire Resistant Rating Must be Maintained at the Ceiling Penetrations
Suspended Acoustic Ceiling with a Gypsum ‘Fire’ Ceiling Above
Interstitial Ceilings Common with elaborate MPE systems Hospitals & laboratories
Purpose: Accommodate extensive MPE systems Provide access for maintenance & updating services
Finish Flooring Functions & Considerations Functions: Visual Acoustics Light Wearing Surface
Considerations Life / durability Skid resistance Sanitation Noise Fire (resistance, combustibility) Other (conductivity,..)
Under-floor Services Distribution of electrical /communications Methods Conduit Cellular Raceways Cellular Decking Raised Flooring
Under-floor Electrical Services Placed in the concrete slab
Reducing Noise Transmission
Use of a Soft material Padded carpet Cushioned resilient flooring Resilient underlayment
Selection of surrounding material Dense ceiling material below (plaster, drywall) Mount ceiling on resilient clips or spring hangers
Skid & Fire Resistance Skid Resistance Measure by its static coefficient of friction (SCOF) Skid resistance – desirable to minimize slipping
Flame Resistance Most flooring required to meet minimum criteria Exit corridors typically have higher requirements
Hard Flooring Materials Resistant to: Wear Moisture
Noisy -conduct sound Types Concrete, stone, brick, tile, terrazzo
Concrete Flooring Advantages Low initial cost Durable
Common Uses Parking decks Warehouses Industrial
Exposed Concrete with a pattern & tinting
Stone Types Marble Granite Slate Sandstone, …
Installation Setting Bed Grouted joints
Marble
Granite
Bricks & Brick Pavers Typically laid on face (but can be laid on edge) Often with a setting bed
With Grouted Joints
Without Grouted Joints
Paver Patterns
Quarry Tile Fired Clay tiles Multiple shapes/sizes Installation Setting Bed (typical) Thin Set Grout Joints
Ceramic Tile Fired Clay Often Glazed Finish Floors & Walls Multiple sizes & colors, smaller tiles shipped with backing sheets
Laying Ceramic Tile
Reinforced ‘Mesh’ Bridge Cracks in Floor
Applying Adhesive with a Notched Trowel
Spacers Being Installed
Tile Placement
Cutting Tile
Small tile shipped with backing sheet
Decorative Ceramic Tile
Terrazzo Ground/polished concrete Typ. granite or marble chips w/ colored cement Divider strips At changes in color/texture, expansion/contraction
Brass Divider Strips
Wood Flooring Materials white & red oak, pecan, maple, pine, ….
Types Wood Strip Flooring - blind nailed Square edge - fasteners visible (or filled) Parquet
Pre-finished or finished in-place (except parquet)
Blind Nailed Strip Flooring
Multiple Floor Finishes wood, tile, & carpet
Resilient Flooring Vinyl Composition Thin (1/8”), rolls or tiles (VCT) Will show substrate irregularities
Multiple colors & patterns Low cost, moderate durability Installation - glued
Carpet Multiple styles, colors, … Indoor and Outdoor Installation Glued directly to substrate, or Pad & tackless strip
Edge Strip
Glued Carpet abutting Terrazzo
Sustainability in Floors and Ceilings Indoor air quality: problems often caused by finish materials and coatings ( glues, binders, fabrics, etc.)
Mold & Mildew: can be a problem in carpets, wall coverings, & fabrics
Vinyl common in finishes: manufacture of vinyl releases significant amounts of air pollution
Recycling of interior materials in its infancy
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