Install William De Morgan ceramic fireplace tiles by mounting handmade 6-inch square tiles featuring authentic Persian Iznik floral or mythological beast motifs. Set the tiles over 1/2-inch cement backer board using heat-resistant polymer-modified thinset mortar, leaving a 1/16-inch hairline grout seam packed with non-sanded grout.
At a Glance: Key Takeaways
- Reduction-Fired Metallic Lustre Glazes: Starving the kiln of oxygen forces copper and silver salts to deposit pure iridescent metal films.
- Persian Iznik & Moorish Animal Motifs: Mythical peacocks, galleons, dragons, and Persian carnations rendered in jewel tones.
- 6-Inch (152mm) Handmade Ceramic Bisque: Subtle undulating handmade surface ripples that scatter firelight reflections.
- Thermal Shock Resistance: High-fired stoneware bisque withstands roaring radiant fireplace heat without cracking.
- 1/16-Inch Hairline Grout Joints: Ultra-narrow grout lines maximize tile pattern continuity across the fireplace surround.
1. Ceramic Chemistry: William De Morgan & The Lost Art of Lustre
Working in close collaboration with William Morris, ceramicist William De Morgan (1839–1917) rediscovered the lost Renaissance technique of Reduction Lustre Glazes (*Lustre Métallique*).
De Morgan painted ceramic bisques with Copper Carbonate and Silver Nitrate Glazes. At the peak kiln temperature (\(1,350^{\circ}\text{F} / 730^{\circ}\text{C}\)), he closed the kiln dampers and introduced wet wood chips to create an oxygen-starved (reducing) atmosphere. The carbon monoxide ripped oxygen atoms from the metal oxides:
$$\text{CuO} + \text{CO} \longrightarrow \text{Cu (Pure Iridescent Metallic Copper)} + \text{CO}_2$$
This deposited a sub-microscopic film of pure gleaming metal on the glaze surface that shifts between ruby red, copper gold, and turquoise blue. Explore overall styles in Aesthetic Movement interiors.
2. Fireplace Installation: Heat-Resistant Thinset & Hairline Grout
Because fireplace surrounds experience extreme thermal cycling, tiles must be bedded over 1/2-inch Cement Backer Board (Durock) using High-Temperature Polymer-Modified Medium-Bed Thinset (such as Laticrete 254 Platinum).
Use 1/16-inch (1.5mm) Hairline Grout Joints filled with Polymer-Modified Non-Sanded Grout in soft charcoal or antique slate. Learn about ebonized woodwork in ebonized cherry Eastlake millwork.
William De Morgan Tile Motif Categories
Use this reference table to calculate exact physical dimensions, ratios, and specifications before purchasing:
| De Morgan Motif Category | Color Glaze Palette | Lustre Reflection Tone | Architectural Role |
|---|---|---|---|
| Persian Flowers & Foliage (Optimal) | Turquoise, cobalt blue & sage green | Iridescent silver & gold shimmer | Fireplace cheeks & arch borders |
| Fantastic Beasts (Dragons & Peacocks) | Copper ruby, dark amber & cream | Vibrant metallic copper-red shine | Center feature tiles / Overmantels |
| Moorish Galleons & Ships | Midnight navy & ruby lustre | Deep golden bronze reflection | Corner accent medallions |
| Standard Solid Victorian Tile | Single flat glaze color | Zero metallic lustre | Generic hearth flooring |
Sanded Grout Lustre Scratching Constraints
Every successful decoration project must account for physical and environmental constraints:
Using Sanded Grout Scratching the Delicate Metallic Lustre Glaze Surface
Sanded grout contains coarse silica quartz that scratches the microscopic metallic lustre film, leaving permanent dull scuffs; strictly use Non-Sanded Polymer Grout (or epoxy grout) applied with a soft gum rubber float.
How to Install De Morgan Lustre Tiles Around a Fireplace
Execute this professional sequence to achieve flawless results without backtracking:
Fasten 1/2" Cement Backer Board to Framing
Screw Durock cement board around firebox opening using ceramic-coated screws spaced 6" OC.
Dry-Lay 6" Tiles to Balance Pattern Symmetry
Arrange De Morgan tiles on the floor; verify equal cut tiles at left and right outer borders.
Trowel High-Temp Polymer Modified Thinset
Spread Laticrete 254 Platinum thinset with a 1/4" square-notched trowel over the cement board.
Set Tiles with 1/16" Precision Tile Spacers
Press tiles into mortar bed, aligning edges with 1/16" flexible rubber cross spacers.
Apply Non-Sanded Grout with Soft Rubber Float
After 24-hour mortar cure, pack charcoal non-sanded grout into seams holding float at 45° angle.
Wipe Glaze Clean with Hydrophilic Sponge
Clean grout haze immediately with clean, damp hydrophilic sponge; buff dry with microfiber cloth.
Common Mistakes & Countermeasures
Avoid these costly errors that compromise aesthetics, ergonomics, and budget:
Using Acidic Grout Cleaners on Metallic Lustre Tiles
Project Execution Checklist
Track your physical progress. Checkboxes persist automatically on this device:
Frequently Asked Questions
Can William De Morgan tiles be used on the floor hearth as well as the vertical surround?
Yes! Authentic reduction lustre tiles are fired to high stoneware temperatures (over 2,000°F) and are fully certified for light domestic floor hearth foot traffic.
