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Chapter 2 Substrates

Proper Preparation and ANSI Requirements for Thin-Set Method Tile Installation.................................................................... 42

Proper Preparation and ANSI Requirements for Thin-Set Method - Notes to the Tile Contractor – Sample Letter for Contractor _43

General Statement on Deflection........................................................................................................................................ 44

Ceramic Tile and Stone Installations over Concrete Substrates............................................................................................. 46

Floor Flatness................................................................................................................................................................... 48

Division 3 versus Division 9 Floor Flatness Tolerances – ASCC Position Statement #6.............................................................50

Concrete Flatness and Level.............................................................................................................................................. 52

Floor Flatness Requirements – Request for Information – Sample Contractor Letter.............................................................. 53

Concrete Substrate Issues................................................................................................................................................ 54

Curing Compounds, Release Agents, and Sweeping Compounds...........................................................................................58

Testing for Curing Compounds – Sample Letter for Contractor .......................................................................................... 59

Interior Horizontal Installation of Tile Over Exterior Glue Plywood (EGP) Introduction..............................................................60

Interior Installation of Tile Over Exterior Glue Plywood (EGP)..................................................................................................61

Ceramic and Stone Tile Installation Over Engineered Wood Structural Floor Assemblies..........................................................63

Summary of Subfloor (Plywood or OSB) Design and Construction Guidelines for Tile Installation............................................... 64

Technical Background – Engineered Wood Structural Floor Assemblies.................................................................................65

General Contractor’s Guide for Ceramic and Stone Tile Installations Over Wood Structural Floor Assemblies.............................68

Glossary of Terms for Engineered Wood Products................................................................................................................. 70

Tile Over Wood Sub-Floors – Notes to the Tile Contractor – Sample Letter for Contractor ...................................................... 71

Tile and Stone Applications on Equivalent Gauge (EQ) Steel Framing.......................................................................................72

Tile Over Steel Stud Assembly – Sample Letter for the Contractor ......................................................................................... 73

NTCA White Paper – Wall-Flattening Products. .....................................................................................................................74

Questionable/Unsuitable Substrates.................................................................................................................................. 76

Substrates/Applications that Require Design Consideration..................................................................................................78

NTCA Reference Manual | 2024 / 2025

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Chapter 2 | Substrates