cement-based flooring systems the good, bad and the ugly h. peter golter, pe
TRANSCRIPT
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Cement-Based Flooring SystemsThe Good, Bad and the Ugly
H. Peter Golter, PE
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Presentation Agenda
• Brief Overview of Concrete
• Brief Overview of Floor Rehabilitation/Resurfacing
• Project Overview – Moisture Related Problems
• Project Overview – Fast Track Construction
• Project Overview – Structural Deficiency/Floors Out-of-spec
• Recap – Review Successful Finish Floor Installations
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Brief Overview of Concrete
• Indestructible, Right?
• How many types of concrete are there?
• What are they?
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What are Floor Resurfacers?
* Referencing ACI 116R-00 Cement and Concrete Terminology
Toppings*
A layer of concrete or mortar placed to form a traffic bearing floor surface on a concrete base
Underlayments
A thin capping of existing concrete, wood or primed metal floors to provide a surface suitable to receive floor covering or coating
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What are Floor Resurfacers?
A thin build of material used to cover and level defects in concrete, vinyl, tile, metal, wood and other subfloors
To strike off a trowel grade, cementitious material to fill in or level rough concrete surfaces prior to the installation of floor coverings
ScreedsSkim Coats
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Why are Floor Resurfacers Necessary?
Requirements for concrete contractors
To correct or modify existing jobsite conditions
Requirements for flooring manufacturers
+/- 1/4” in 10 lineal feet +/- 1/16” in 10 lineal feet
There are different industry standards for the different tradesExample:
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Advantages of Floor Resurfacers
• With floor resurfacing products, installers can meet any flooring system requirement
• The following floor finishes require smooth floors
– Vinyl sheet goods
– Wood
– Thin coatings
– Stains
– Sealers
• Units of measurement:
– +/- “x" inches/10 feet
– Flatness (Ff)
– Levelness (Fl)
Level a floor within required specification
Wood flooring
Self-leveling underlaymentAdhesive
Concrete substrate
Primer/admixture (when required)
Patching material
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Commercial Applications
• Offices
• Educational facilities
• Municipalities
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Residential Applications
• High rises/condominiums
• Single-family homes
• Townhomes
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Healthcare Applications
• Medical office buildings
• Outpatient facilities
• Assisted living facilities
• Hospitals
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Retail Applications
• Restaurants
• Malls/shopping centers
• Big box and shoe box
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Industrial Applications
• Food processing
• Chemical
• Pulp and paper
• Manufacturing
• Warehouse
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What Technologies are Available Today?
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Available Technologies
• Gypsum: least expensive, most common material
• Portland-based: moderately priced; wide range of applications
• Modified Portland:
– Polymer: Adds density and flexural capabilities
– Pozzolans: Densifiers and increases ultimate strength
• Self-drying cements: Extremely quick return to service due to rapid internal hydration
• Polymers (resins): Very expensive, engineered plastics; typically vapor barriers
Price
High
Low
Performance
Low High
Gypsum
Portland-based
Modified Portland – pozzolans
Modified Portland – polymer
Self-drying cements
Polymers (resins)
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Advantages of Floor Resurfacers
• A variety of products are engineered for longevity and durability for the following traffic conditions: – Residential foot traffic– Commercial foot traffic – Vehicular traffic– Industrial hard wheel traffic – Steel wheel traffic
Support the traffic load
NOTE: Contact the manufacturer for specific material or product recommendations
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Advantages of Floor Resurfacers
• Conventional concrete is 3,000-4,000 psi compressive strength
• Engineered materials with performances up to and exceeding 10,000 psi for greater longevity and reduced maintenance costs
Abrasion resistance
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Who is Typically Involved in These Projects?
What does a winning team look like?
Owner Architect
EngineerContractor/Specialty Contractor
ManufacturerSupplier
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What is the #1 Priority for Any Property Owner?
VALUE!
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Perception versus Reality
• Factory-fabricated samples for system selection
• Insist on representative jobsite mockups
• Use jobsite mockups and field flow tests as quality assurance
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What Happens with Moisture in the Concrete?
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Concrete and MoistureConcrete and Moisture
Every flooring manufacturer has specific requirements regarding the moisture content of concrete to receive their flooring.
These requirements must be made known to the specifier, architect, general contractor and flooring specialist.
• Setting and Meeting Expectations
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Don’t install until it passes
Wait for the concrete to dry
Accept a sign off from the general contractor!?
When Moisture Testing Fails…
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Modes of Concrete Floor Moisture Failures
Adhesive breakdownDisbondingAlkali attackMicrobiological activityStainingEfflorescenceCondensationCurling
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Adhesive Breakdown
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Disbonding
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Adhesive Oozing
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Mold
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Efflorescence
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Moisture in New ConcreteNew meaning to embedded steel
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How Fast is – Fast Track Construction?
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Fast Track Construction Rehab a Floor Over the Weekend
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Preparing the Floor
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Application of PrimerExisting Concrete and Epoxy Coating
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1-Comp.Primer
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Attention to DetailsWeigh out the Pigments by Batch
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Delivery Method
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Gauge Rake – Proper DepthSmoother – Get the “Glass” Finish
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Protect the surrounding areaFinal Clean-up
Integral Color & Sealed – Before and After
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Finished Floor
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Structural Deficiency – Floors Out of Spec
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What Went Wrong?
• Structure was “Value Engineered”
• Construction was awarded to “Low Bidder”
• Bonus to GC to complete the project early
• Project Schedule was compressed
• Does “Pisa” come to mind?
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What Is The Solution?
• Analysis indicates dead loads are a major consideration.
• Design Criteria:– Level the floors. Some areas 3+ inches– Maximum 60#/Cubic Foot for repair material– Material must be at least 3,500 psi for finish
flooring manufacturer’s to warrant their product– Quick return to service, next day trades are on it
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Repair Material Staged on Job
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All floors marked to finish elevation
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All floors marked to finish elevation
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Surface Preparation - Shotblasting
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Application of Primer
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Verifying the Finish Elevation
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Water Source and Pump
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Getting Ready to Pump
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Pump Operator
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Mixed Material Going into Pump
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Material being placed and finished
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Floor is now level!!!
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Finished Cured Floor
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What is the Size of the Project?
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Bldg#2 - So what went wrong?
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Finished Installations
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Finished Installations Gone Wrong
• Wavy floors (i.e., sheet goods, epoxy coatings)
• Hollow spots under wood floors
• Transitions to different finished flooring materials (i.e., carpet, wood, sheet goods and tile)
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Cement MasonsA Wear Topping Stained and Polished
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LA RestaurantStained and Polished
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Finished Installations Done Correctly
• Screeds
• Self levelers
• What is the primary function?
– Utility (warehouse floors)
– Decorative (commercial floors)
Toppings
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Finished Floors
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Finished Installations Done Correctly
• Large body tile or stone placed tight together
• Slope to drain
• ADA compliance
Screeds (dry pack and wet mix)
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Examples of Finished Installations
• Installation consisting of
− Screed floor (mud bed)
− Polymer modified thin set
− Porcelain body tile
− Polymer modified grout
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Examples of Finished Installations
• Installation consisting of
− Skim coat
− Carpet adhesive
− Carpet tiles
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Examples of Finished Installations
• Installation consisting of
− Self-leveling underlayment
− Urethane wood adhesive
− Pre-finished engineered wood
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Examples of Finished Installations
• Installation consisting of
− Self-leveling underlayment
− Mastic
− VCT
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