One of the product pictures shows the wool covering up the entire bottom of the fireplace - even over the flame holes it appears. Is that correct?

It looks like it actually sits in front of the gas line for the flames. But it does ignite and the colors are really pretty. One bag was more than enough. peace

I replaced the fake logs in my gas fp with tumbled lava rock. if i use this under/around the rocks will it make the flames more yellow?

I don't think think so. After my gas fireplace has been started, the wool begins to glow, similar to burning embers. It does not change the color of the flame.

Can this be used in an outside gas fire pit

Probably It holds up well in the indoor gas logs. It may rust outdoors though.

how do I use with lava rock pebbles in fireplace basket?

I had lava rocks around my gas logs on the floor. I do not use them now but have the rock wool in the ember area.

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Rock Wool

Product ID: 20189322

Details

Brand
Midwest Hearth
Item Form
Mineral Fiber
Item Weight
170.1 g
Material
Rock Wool
Unit Count
1 Count

⛽Compatible with natural gas & propane

🔥Realistic glowing ember effect

🇺🇸Made in USA, asbestos-free quality

$67

Duties & taxes included

In stock

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Description

🔥 Elevate your fireplace game with embers that glow like the real deal!

DURABILITY THAT LASTS - Resists extreme heat and repeated use—one 6 oz bag covers a full fireplace plus touch-ups.
PROUDLY AMERICAN MADE - Crafted in the USA with 100% asbestos-free mineral fiber for trusted safety and quality.
IGNITE AUTHENTIC AMBIANCE - Rock wool glows like live coals for a mesmerizing wood-fire vibe.
UNIVERSAL FUEL COMPATIBILITY - Seamlessly works with both natural gas and propane fireplaces, vented or vent-free.
INSTALLER APPROVED APPLICATION - Easy to apply with tips for optimal ember glow and flame breathability.

Midwest Hearth Rock Wool is a premium, asbestos-free mineral fiber designed to create a realistic glowing ember effect in gas fireplaces. Made in the USA to high-quality standards, it is compatible with both natural gas and propane systems, vented or vent-free. Durable and easy to apply, this 6 oz pack provides long-lasting ambiance enhancement trusted by homeowners and professionals alike.

Specifications

ASIN	B00ZE2GSUK
Best Sellers Rank	#5,525 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #1 in Gas Logs
Brand Name	Midwest Hearth
Customer Reviews	4.6 4.6 out of 5 stars (4,970)
Item Form	Mineral Fiber
Item Highlight	Asbestos-Free Mineral Fiber, Vented & Unvented, NG & Propane Compatible, Realistic Glowing Embers Effect, Long-Lasting
Item Weight	170.1 g
Manufacturer	Midwest Hearth
Manufacturer Part Number	MH Rock Wool
Material Type	Rock Wool
Model Number	MH Rock Wool
Number of Packs	1
UPC	638170653155
Unit Count	1 Count

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$67