Approximate Thickness Of Metal Lathe + Scratch Coat? - Masonry - Contractor Talk

Approximate Thickness Of Metal Lathe + Scratch Coat?

 
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Old 06-30-2019, 09:59 PM   #1
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Approximate Thickness Of Metal Lathe + Scratch Coat?


Im working on my exterior wall detail. Looking to do a brick veneer over 2 foam insulation w/ integrated studs. this will be 10 above grade to top of block

Just asking you experienced masons. What is your typical thickness of metal lathe plus scratch coat. My idea is to not have my brick veneer protrude past the siding. Rather have it recessed. I plan to use just a 1/2 brick veneer


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Old 06-30-2019, 11:44 PM   #2
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


The lath is pretty thin, like an 1/8th...But the problem is when the lath overlaps another piece or two it starts to build up

I would say no more than 3/8in thick


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Old 07-01-2019, 09:28 AM   #3
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


Quote:
Originally Posted by Windycity View Post
The lath is pretty thin, like an 1/8th...But the problem is when the lath overlaps another piece or two it starts to build up

I would say no more than 3/8in thick





And a tad thicker if you use self furring lath,which I prefer. Ideally,three coat stucco should finish out between 3 / 4 " -- 1".
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Old 07-01-2019, 09:42 AM   #4
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


Actually,the ASTM standard requires self furring lath over a solid surface.

Sometimes flat or non-self-furred lath,
or flat rib lath, is used over solid surfaces. ASTM states that self-furred lath
shall provide approximately 1/4-inch
furring away from the solid surface in
order to provide proper keying of the
stucco, and that self-furred lath must be
used on all solid surfaces. Self-furred
lath is furred with dimples or embossed
ribs in the mesh that provide for the
required 1/4 inch of furring. Flat rib
lath should not be considered selffurred because it does not offer an adequate amount of furring
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Old 07-02-2019, 06:42 PM   #5
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


3/8" to 1/2"
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Old 07-03-2019, 12:41 AM   #6
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


As You go to the "thin" side of any materials normal thickness, any previous errors will telegraph to the surface.

The crappier the underlying workmanship, the greater the need for an ever thicker scratch coat... Tom Jefferson's Monticello has rooms with 6-7 inches of plaster to square up the slave Mason built walls......

Remember at corners, if you don't stagger every other course there are FOUR layers of mesh, and any exposed steel mesh/fasteners will eventually rust.
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Old 07-13-2019, 02:57 PM   #7
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Re: Approximate Thickness Of Metal Lathe + Scratch Coat?


1/2" to 3/4" Using faces cut to half thickness is not the standard. Cut the faces to 1" or so. You need 7 of them (modular size) to weigh less than 14 pounds.

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