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Old 01-05-2012, 09:03 AM   #1
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Fireplace Reno - Scratch Coat


Should be ready to apply my scratch coat this weekend once I finish hanging the wire mesh.

Is there any specific type of mortar that I should use? Type S or Type N etc.?
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Old 01-05-2012, 09:05 AM   #2
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Fireplace Reno - Scratch Coat


May want to let us know what it is you going to be applying to that wall.

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Old 01-05-2012, 09:08 AM   #3
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Fireplace Reno - Scratch Coat


Sorry Joe,

Natural stone - Idaho Quartz will be applied to the wall.
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Old 01-05-2012, 01:15 PM   #4
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Fireplace Reno - Scratch Coat


I have installation instructions for veneer stone (doing a similar project myself). They specify either type of mortar (N or S) that meets ASTM C270.
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Old 01-05-2012, 02:38 PM   #5
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Fireplace Reno - Scratch Coat


Thanks for the response.

I am seeing that the difference b/t Type N and S is in the pressure.

Type N: Reaches 750 psi @ 28 days
Type S: Reaches 1800 psi @ 28 days

I'm guessing this is compressed strength. Not sure if there is a difference when using one for this application. Anyone know the answer?
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Old 01-05-2012, 02:45 PM   #6
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Fireplace Reno - Scratch Coat


Compression doesn't matter in this case.

Use Type "S" tho.

I'm surprised the faux stone supplier didn't want to also sell you the mortar. Whats' up with that?
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Old 01-05-2012, 08:06 PM   #7
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Fireplace Reno - Scratch Coat


Thanks Bud, I didn't get the stone yet so they didn't have the chance to try selling mortar to me

1 last question, should i rake the mortar with a 1/4" notched trowel on the scratch coat, or just keep it tight against the wire mesh?
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Old 01-05-2012, 08:09 PM   #8
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I've always raked/comb them but not with a notched trowel. They make a tool for that purpose that is somewhat flexible.

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