Mortar Bed for Hearth Extension

[BrianR99]

I've got a 1950's ranch with a wood burning fireplace. During the remodel we busted out the hearth extension. The extension was flush with the wood floor and hade ceramic tile covering a thick mortar bed reinforced with metal lathe. I plan on re pouring the mortar bed. Is there a certain type I should use? Refractory mortar for example
My plan is to use Mapei Mud Bed 4-1. Thanks far the help.

 

[bholler]

I've got a 1950's ranch with a wood burning fireplace. During the remodel we busted out the hearth extension. The extension was flush with the wood floor and hade ceramic tile covering a thick mortar bed reinforced with metal lathe. I plan on re pouring the mortar bed. Is there a certain type I should use? Refractory mortar for example
My plan is to use Mapei Mud Bed 4-1. Thanks far the help.

Concrete reinforced with rebar. And no combustibles contacting the bottom of the slab

 

[BrianR99]

Is there a reason for concrete instead of a mortor mix? I will use wire mesh with the mortar. Thanks

 

[bholler]

Is there a reason for concrete instead of a mortor mix? I will use wire mesh with the mortar. Thanks

Because mortar isn't strong enough to be self supporting

 

[BrianR99]

There is existing framing that is underneath the bed. This was used to support the original bed,

 

[BrianR99]

It has existing framing that supported the original bed. Does that change anything? I was going to put tar paper down and then pour on top. I could also make a metal pan if that would be better.

 

[bholler]

It has existing framing that supported the original bed. Does that change anything? I was going to put tar paper down and then pour on top. I could also make a metal pan if that would be better.

It can't have framing under it

 

[BrianR99]

From what I've read, code states that you need 2" thick non-combustible material for the hearth extension which I will have and was also there before. It's all original framing so at one point it was legal I guess.

 

[kborndale]

From what I've read, code states that you need 2" thick non-combustible material for the hearth extension which I will have and was also there before. It's all original framing so at one point it was legal I guess.

Just because that's how it was doesn't make it legal. Code is often ignored.

 

[bholler]

From what I've read, code states that you need 2" thick non-combustible material for the hearth extension which I will have and was also there before. It's all original framing so at one point it was legal I guess.

2" thick self supporting reinforsed concrete slab with no combustibles contacting the bottom of that slab.