18" Half-Moon Ceramic Heat Deflectors for XL Big Green Egg | CGS

Superior Flexibility - Outperforms One-Piece Deflectors

Our 18" (18.5" actual) ceramic heat deflectors are built for serious cooks. At approximately 3/4" thick, they handle the rigors of kamado cooking and deliver consistent performance.

Built specifically for the XL Big Green Egg, these deflectors work seamlessly with the CGS XL Woo, CGS XL Adjustable Rig, and EGGspander.

More flexible than a one-piece deflector (ConvEGGtor), the half-moon design allows full indirect, split-zone, or elevated setups.

While optimized for the XL Big Green Egg, these deflectors are also compatible with CGS systems for Kamado Joe Big Joe, Pit Boss 24, and Louisiana Grills 24, and can double as a pizza stone.

Benefits of Half-Moon Deflectors

A heat deflector transforms your kamado from a typical grill into a barbeque smoker or dual zone grill by blocking direct heat and redirecting it around the food. The deflectors require a rack (Woo, Adjustable Rig, EGGspander) to hold them.

• True indirect BBQ — ideal for brisket, ribs, pork butt, and poultry
• Two Temperature Zones — perfect for reverse sear and holding 
• Even heat distribution — reduces hot spots
• Versatile setups — bake, roast, or smoke with confidence

Pair vs. Full

A pair of half-moon deflectors is the most versatile option:

Half-moons

• Easier to place before a cook
• Easier to remove during a cook
• Use both for full indirect BBQ setups
• Use one for two-zone (direct + indirect) grilling
• Use both together for pizza
• Lower replacement cost if one breaks

Full round

• Best for a dedicated pizza stone

Use as a Pizza Stone

These deflectors can double as a pizza stone, but bigger isn’t always better:

• Wide diameter stones are harder to handle and move
• Temperature control becomes more difficult
  

Pro Tip: If you're not a pizza pro, go 16" for a pizza stone—easier to handle with more consistent results.

Grill Compatibility

XL Big Green Egg - CGS 18" Deflectors match the size of the XL ConvEGGtor and offer more flexibility when used in these systems.

• CGS XL Woo Expander
• CGS XL Adjustable Rig System
• EGGspander Basket
• CGS Spiders & Accessory Rings
• CGS Flexible 2nd Grid

Kamado Joe Big Joe - Designed for use with the Divide & Conquer system or CGS accessories.

• Divide & Conquer Rack (requires accessory rack)
• CGS Adjustable Rig
• CGS Deep Drop Spider
• CGS Big Joe Woo Expander

Note: CGS 18" deflectors do not fit the lowest level of the Divide & Conquer system. Use with the accessory rack above the firebowl.

Pit Boss 24 & Louisiana Grills 24 - Add more capability than a single grid.

• CGS Adjustable Rig system

Size & Specifications

• Diameter: 18.5" (commonly referred to as 18")
• Thickness: Approx. 3/4"
• Material: High-heat cordierite mullite refractory ceramics
• Total weight (pair/full): Approx. 13.6 lbs

Use Tips

• Place in the grill during warm-up to reduce thermal shock
• Use a drip pan to protect the surface
• Avoid rapid temperature changes

Care & Maintenance

• Do not use soap or detergents
• Do not clean in a dishwasher
• Scrape debris and burn off at moderate temperatures
• Expect natural darkening from use

Don't Forget the Drip Pan

For longer cooks, we strongly recommend using a drip pan above the deflector. This helps protect the ceramic, reduces buildup, and keeps your kamado cleaner.

Benefits of a Gap

On BBQ cooks, CGS Ceramic Spacers lift the drip pan off the deflector, reduce heat transfer, and help prevent burnt drippings and off-odors.

On the CGS Woo or EGGspander, 1-1/2" is the maximum lift for the CGS drip pan. Shown are CGS 2" spacers used on their 1-1/2" side for stability.

Adjustable Rig users: the rig naturally creates spacing between the deflector and drip pan. An extra Slide Guide or pair of Crossbars is needed.

This setup is our favorite for one-grid BBQ cooks in the XL EGG. It provides great airflow and direct access to the fire.

Pro Tip: On pizza cooks, use a gap between the deflector and pizza stone for more consistent pizza stone temperatures.

FAQs

How does the 18.5" compare to the Big Green Egg ConvEGGtor?

The CGS 18.5" deflector is slightly larger than the circular portion of the ConvEGGtor.

Are these the same size as Big Joe deflector plates?

No. Big Joe deflectors are approximately 19.5". CGS 18.5" deflectors will not fit the lowest level of the Divide & Conquer system.

Will heat escape between two half-moons?

Yes, but the amount is minimal and does not meaningfully affect cooking performance.

Can I foil the deflectors?

You can, but creases in foil can create pinholes that may leak. Avoid wrapping the bottom side, as extreme heat could damage the foil.

Can they be used as both a deflector and pizza stone?

Yes. For pizza, we recommend parchment paper or cornmeal to prevent sticking. Using a drip pan during BBQ cooks keep the deflector cleaner for pizza.

Can I high-heat clean burn the deflector?

We do not recommend it. Using a drip pan greatly reduces the need for cleaning.

Are half-moons better than a full round?

If you cook pizza frequently, a full round is a great dedicated option. For most setups, we recommend half-moons for their flexibility.

Brand Compatibility & Product Engineering

Ceramic Grill Store is an independent manufacturer and retailer of kamado grill accessories. We are not affiliated with or endorsed by Big Green Egg, Inc. or Kamado Joe Company.

“Big Green Egg,” “EGG,” “ConvEGGtor,” and “EGGspander” are trademarks of Big Green Egg, Inc. “Kamado Joe” and “Divide & Conquer” are trademarks of Kamado Joe Company. All trademarks are used solely to describe compatibility.

Since 2005, CGS has engineered premium accessories designed for compatibility with leading kamado grills.