How to Install Thin Stone Building Veneer
Tools and Materials: Hammer, Brick Trowel,
Scraper, Stiff Brush, Flat Trowel, Joint Tool, Grout Bag, Masonry Brush, Sand & Cement, Selected Stone.
How to Install: Natural Thin Stone Veneer
may be applied over any masonry surface, concrete block, brick, cement, etc.
Painted surfaces must be sandblasted, or otherwise stripped of paint.
If it is difficult to remove paint or if surface is of frame construction,
nail metal lath to wall securely, 6" on center. (For exterior, vapor barrier
first, then metal lath.) Apply scratch coat (2 parts washed sand to
1 part Portland cement) to lath. Make certain lath is covered completely
with a thin coat (1/2" - 3/4" thick) . Use a metal scraper or small
scrap of lath to lightly rake horizontal grooves in the scratch coat.
Allow scratch coat to set up or cure. This is now a masonry surface
to which the Thin Veneer may be applied using the following steps:
a. Mix rich mortar ( 2 parts washed sand
to 1 part Portland cement ) to a creamy consistency similar to whipped
potatoes. Mix a minimum of 5 minutes.
b. Determine if stones will be laid out on
ground to the desired fit prior to installation, or if trimming is required
to complete finished application.
c. Make certain surface is free of dirt, sand,
or loose particles. When necessary, wash stone completely. If
surface is dry, dampen first with a masonry brush but do not saturate.
This prevents the wall from pulling the moisture from the mortar, allowing
it to set up both naturally and with a better, stronger bond. For cleaner
installation, begin applying stone at the top of the wall and work toward
the bottom.
d. Trowel rich mortar onto wall approximately
1/2" thick
e. Take clean stone and slightly dampen
back side. This frees any dust and again prevents moisture loss from
mortar.
f. Apply thin coat of rich mortar onto
back side of stone. This fills in pits and rises in the stone and creates
a stronger bond with the wall.
g. Press stone into mortar, rotating slightly,
forcing some of the mortar to squeeze out freely. Any mortar forced
out beyond the finished joint or on the stone surface itself must be removed
with trowel, joint tool, or brush before the mortar is allowed to set up.
Narrow joints will provide a nice appearance.
h. Use a grout bag to fill all joints (or
use trowels). As the mortar stiffens, tool to the desired depth and
be sure to brush off all excess. Be sure not to allow any mortar to
harden on the face of any stone. This will aid in the cleanup process.
How to Clean:
Excess dirt and film may be removed using clean water
and a stiff brush, It is important not to allow mortar to dry on face
of stone. Remove it prior to it hardening.
How to Seal:
Stone may be sealed with a good quality penetrating
sealer only after thoroughly curing which usually takes 4 weeks on inside
work. Follow the manufacturer's directions on the application of sealer.
Sealed stone may be easier to clean than unsealed stone and certain
sealers also repel stains. However, sealers must be periodically reapplied,
especially on exterior applications, and could alter the natural coloring
of the stone.
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