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SBI Micore-300 Mineral Fiber Insulation Board - Pack of Four
SBI Micore-300 Mineral Fiber Insulation Board - Pack of Four
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SBI Micore-300 Mineral Fiber Insulation Board - Pack of Four
$233
53
Was
$289.99
Save
$56.46
(19%)
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1
Usually ships within 5-7 business days
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Product Details
Versatile and sturdy with a nearly endless list of applications, passive fire protection from SBI is simply peerless. This Micore-300 Mineral Fiber Insulation Board features slag wool mineral fiber construction for extra safety and durability. This pack contains four exceptionally high-quality Micore-300 boards. These protective insulating boards make a great addition to homemade stove boards, fireplace framing, and more. SBI's high-quality materials are among the finest in the industry, so you can't go wrong with this stellar Mineral Fiber Insulation Board from SBI.
Customer Q&A with Product Specialists
Tom
from Syracuse NY asked:
If I use Micore as a hearth pad insulation, can I mortar tile directly to it?
An additional layer of concrete board should be used on top of the Micore for added strength prior to installing mastik and tile.
Answered by:
Aaron D.
on Nov 03, 2025
Jon
from New Hampshire asked:
Will a leveling agent or thinset adhere to this for installing slate on a hearth pad?
A piece of concrete board should be installed on top of the Micore prior to installing your mastik/tile adhesive. The micore is not dense enough to bare the weight of the appliance.
Answered by:
Aaron D.
on Nov 03, 2025
Greg B.
from Quincy Ill asked:
Are these 4 48x24 pieces?
Yes, this is four 48 x 24 pieces.
Answered by:
Kathy O.
on Apr 04, 2024
Dan Z.
from 16115 asked:
Do you have this in 1/4" or 3/8" thickness?
We apologize, but we do not carry the Micore in 1/4 or 3/8 inch thickness.
Answered by:
Kathy O.
Showing 4 of
47 Questions and Answers
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Customer Reviews
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SBI Micore-300 Mineral Fiber Insulation Board - Pack of Four
Yes, I would recommend this item.
By Updatecategoryparent
Fast delivery, product in great shape!
Used to make a fire shield for my new wood stove. Put on a tin tile facing--and it's beautiful!
Yes, I would recommend this item.
By Ralph
Verified Buyer
Just what I needed for floor protection project
I needed a non-combustible board with a minimum insulation rating to build in floor protection system for a wood burning kitchen range. This board will be the bottom layer of the protection system followed by cement backer board and then ceramic tile. The top of the ceramic tile will be level with the surrounding kitchen floor for a better look and avoidance on any tripping hazards. If you are interested I can provide heat transfer calculations and construction photos.
Pros
Nice size for handling, just the right thickness to provide required R-value, easy to work with.
Cons
A little more expensive than my original calculations, but then everything construction related has increased in price.
Yes, I would recommend this item.
By Lori
Verified Buyer
Exactly what we needed!
First of all, I commend efireplace store on their customer service. The product was exactly what I needed to become part of a DIY wood stove hearth. The product was shipped before its promise date. Can’t beat that.
Yes, I would recommend this item.
By James
Verified Buyer
amazing product
I purchased this for our fireplace facing the area above a gas fireplace that prevents heat from transfer and combustion of regular drywall materials. The fireplace was installed by someone else and was too close to tv and also too large of a unit. We had hardi board but that was heating and retaining heat. We used micore 300 and finished with wire mesh and durabond spackle, came out great heats about 40-50% less than cement board. One note if not going to install cement board on face of micore 300, and going to use as finished wall surface prime the board first.Original fireplace came with 5" of "non combustible facing" but was unable to order more this actaully worked out for me getting almost 18" of micore 300 instead of 5" that came with.
Pros
light weightwithstands high heatlow thermal transfer
Cons
only con and mostly because i am using as a finished wall surface is needs to be primed prior to spackle ( not exactly a con just using in ways different than intended)
Yes, I would recommend this item.
By Hildabob
Verified Buyer
Exactly what I needed
Gave me a great R-value without making my Hearth massive. I did two layers of Micore-300 sandwiched between 1/2" Hardie board
Pros
So easy to install!!
Cons
Have not had a con yet
Yes, I would recommend this item.
By Toml
Verified Buyer
Prompt shipping arrived in great condition
Should work well for underlaymrnt of hearth
40
Reviews
98%
would recommend this to a friend
Showing 6 of
40 Customer Reviews
