Custom stone fireplaces
Custom stone fireplace surrounds, mantels, and outdoor fireplaces. Heat-rated stone for firebox and hearth. Full design and installation available.
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All stone sourced from quarries in Mexico · Per project request · 4–8 week lead time for Southern California projects
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Common questions about custom stone fireplace
From stone origin and material selection to installation requirements and maintenance.
What mortar is used for stone fireplace surrounds?▼
Stone fireplace surrounds require refractory mortar rated to 2,000 degrees Fahrenheit within 12 inches of the firebox opening. Standard Type S masonry mortar is used beyond 12 inches. Never use standard mortar in the firebox zone.
Where does the stone for NexaBuilder fireplaces come from?▼
Fireplace stone is sourced from quarries in Queretaro and Oaxaca, Mexico. Cantera, Chiluca, and Basalto have been used in Mexican architecture for centuries. The fireplaces of historic haciendas and colonial churches were built from the same Cantera stone we source today.
How much structural support does a stone fireplace mantel need?▼
Stone fireplace mantels require mechanical anchors bolted into structural framing at minimum every 16 inches. Do not rely on adhesive alone. A stone mantel over 6 feet wide typically needs a steel support angle reviewed by a structural engineer.
Can I get a custom-sized stone fireplace surround?▼
Yes. All NexaBuilder stone fireplace surrounds are fabricated per project to your exact dimensions. Stone is CNC-cut in Mexico and hand-finished by maestros.
What clearances are required for an outdoor stone fireplace?▼
Minimum 18 inches of clearance to any combustible material per standard fire code. A spark screen is required. Verify local jurisdiction requirements with your building department.
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Installation & Finishing Guide
Materials, methods, finishing products, tools, and pricing guidance for stone fireplaces installation in Southern California.
Structural & Setting Requirements
Fireplace surrounds and firebox faces use refractory mortar rated to 2000F within 12 inches of firebox opening — not standard masonry mortar. Hearth stone is set on a reinforced concrete slab extension rated for ember impact. Mantel stone requires mechanical anchors to structural framing. Outdoor fireplaces need a spark screen and clearance to combustibles per local code.
Standard setting mortar: Type S masonry cement + washed plaster sand (1:3 ratio). For wet areas and pools: white latex-modified thin-set. Never use pre-mixed mastic in wet or exterior applications.
Natural stone is heavy. Calculate dead load per square foot: cantera avg 12–14 lbs/ft², travertine 13–15 lbs/ft², quartzite 16–18 lbs/ft². Submit loads to structural engineer for any overhead or load-bearing applications.
For any wet-area application, apply crystalline waterproofing membrane (XYPEX, Kryton, or equivalent) to substrate before stone setting. Two coats at 90° to each other. Allow full cure before setting stone.
Cleaning, Sealing & Enhancement
After mortar cure (72 hrs), clean with pH-neutral stone-safe cleaner. Remove grout haze with manufacturer-recommended haze remover — not muriatic acid, which damages porous stone. Rinse thoroughly.
Apply penetrating impregnator sealer (silane/siloxane blend) after cleaning and full cure. Exterior: StoneTech BulletProof or equivalent. Pool-adjacent: chlorine-resistant formula. Re-seal every 1–3 years.
For color enhancement (wet-look or natural finish), use enhancer + sealer combo product. Test on back of sample piece first — some stones will darken significantly. Enhancement is permanent.
pH-neutral cleaner only for daily cleaning. No vinegar, bleach, or citrus. For stain removal, use stone poultice appropriate to stain type (oil, rust, organic). Re-seal on schedule. Inspect joints annually.
Tools & Jobsite Equipment
- Angle grinder with 4″ diamond blade
- Wet tile saw with diamond blade (7″–10″)
- Hand-held circular saw with segmented diamond blade
- Stone chisel set + 3 lb mash hammer
- Bull-nose router bit (for edge profiles)
- Laser level (rotary, self-leveling)
- 4’ and 6’ bubble level
- Rubber mallet + wooden beating block
- Notched trowel (1/2″ square-notch for thick-set)
- Suction cup lifters (for large slabs)
- Stone spacers (3/8″ and 1/2″)
- Grout float (for wide joints)
- Grout bag + nozzle (for raked joints)
- Sponges + 5-gal buckets
- Caulk gun (for silicone joints)
- Painter’s tape (protect stone from mortar drips)
- Stone dolly / panel cart (for heavy slabs)
- Mortar mixer (drum or paddle)
- Scaffolding or pump jack (elevated work)
- Vacuum + HEPA filter (silica dust control)
- PPE: N95 respirator, safety glasses, cut-resistant gloves
Cutting dry stone generates crystalline silica dust — a known carcinogen causing silicosis. Always wet-cut or use vacuum dust collection. Never dry-cut cantera or travertine without N95 minimum respiratory protection.
Pricing a Stone Fireplaces Job
All stone is sourced and imported from Mexico per project. Lead time is typically 4–8 weeks from order confirmation. Do not schedule installation without confirmed delivery date and full material inspection on arrival.
Order 10–15% overage on all stone — breakage, cuts, and pattern matching demand extra material. Once a lot leaves the quarry, matching is nearly impossible. Leftover stone has resale value; short material stalls the project.
Include in your bid: substrate prep, waterproofing, structural steel (if required), mortar and grout materials, sealer, equipment rental, and disposal. Stone is often 40–60% of project cost.
Always inspect stone in person before full order — photos don’t capture variation, color, or finish accurately. Request samples of the actual lot. Verify dimensions are exact before cutting begins.
Ready to order stone fireplaces?
All stone is sourced per project from Mexico. Request a quote and we’ll match you with a CSLB-verified stone contractor and confirm material availability.
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