Use and Care Manual

MiTek
®
Product Catalog
Copyright © 2020 MiTek Industries, Inc. All Rights Reserved
13
Corrosion Information
UC1 Interior construction, Continuously protected from
General framing,
Interior/Dry Above ground, weather or other sources of
interior construction Untreated G90
Dry moisture
UC2 Interior construction, Protected from weather, but may be
Sill plates SBX-DOT, Organic G90
Interior/Damp
Above ground,
subject to sources of moisture
ACQ-D (0.15), CA-B (0.10),
Damp
CA-C (0.06), MCQ (0.06),
µCA-C (0.05)
UC3
A
Exterior construction, Exposed to all weather cycles, not
Exposed exterior beams ACQ-D (0.25), MCQ (0.15),
Above Ground Above ground, exposed to prolonged wetting
or columns in an open,
CA-B (0.10), CA-C (0.06),
Protected Rapid water runoff
covered structure
µCA-C (0.05), Organic
UC3B Exterior construction, Exposed to all weather cycles,
Deck beams and joists ACQ-D (0.25), MCQ (0.15),
Above Ground Above ground, including prolonged wetting
CA-B (0.10), CA-C (0.06),
Exposed Poor water runoff
µCA-C (0.05), Organic
UC4
A
Ground contact, Fresh Ground contact or fresh water
ACQ-D (0.40), MCQ (0.23),
Ground Contact water; includes above exposed to all weather cycles,
CA-B (0.21), CA-C (0.15),
General Use ground applications Normal exposure
µCA-C (0.14)
UC4B Exterior construction, Ground contact, fresh/salt water
Permanent wood ACQ-D (0.60), MCQ (0.23),
Ground Contact Ground contact, water splash exposed to all
foundations, critical CA-B (0.31), CA-C (0.25),
Heavy Dut
y
Critical components
weather cycles
structural members µCA-C (0.23)
1
)
G90 and G-185 refer to
g
alvanization re
q
uirements for ASTM A653 material.
2
)
Connectors
g
alvanized to ASTM A123 ma
y
be used in
p
lace of either G90 or G185 coatin
g
s.
3
)
Other coatin
g
ma
y
be suitable for a
g
iven environment if the conditions are known and
p
redictable.
4
)
For G185 connectors use fasteners
g
alvanized
p
er ASTM A153. For Gold Coat connectors, use Gold Coat fasteners and for
stainless steel connectors, use stainless steel fasteners.
5
)
If the enviroment has the
p
otential to contain elements which ma
y
make it more corrosive, the use of stainless steel is recommended.
6
)
MCQ is a micronized co
pp
er treatment such as Micro Pr
o
b
y
Ko
pp
ers.
µ
CA-C is a dis
p
ersed co
pp
er treatment manufactured b
y
Arch
Treatment Technolo
g
ies. Or
g
anic
p
reservatives include L
3
from Arch Treatment Technolo
g
ies and EcoLife II from Viance
,
LLC.
7
)
For wood treatments not shown, contact MiTek or the wood
p
reservative manufacturer for recommended coatin
g
s.
8
)
Testin
g
b
y
MiTek has found that in interior a
pp
lications where the treated wood will remain relativel
y
dr
y
durin
g
its service life the use of
G90 connectors with MCQ or
µ
CA-C treated wood is a
pp
ro
p
riate.
9
)
American Wood Protection Assocation Standard U1-16.
10
)
SBX/DOT= Sodium Borate; ACQ-D = Alkaline Co
pp
er Quat T
yp
e D; CA-B = Co
pp
er Azole T
yp
e B; CA-C = Co
pp
er Azole T
yp
e C;
MCQ = Micronized Co
pp
er Quat;

CA-C = Dis
p
ersed Co
pp
er Azole T
yp
e C. The number listed in the
p
arenthesis is the re
q
uired retention
level in
p
ounds
p
er cubic foot, or PCF.
11
)
Deck
j
oists and beams must be treated to Use Cate
g
or
y
UCA4 when the
y
are difficult to maintain, re
p
air or re
p
lace and are critical
to the
p
erformance and safet
y
of the deck.
12
)
Users must
p
erform
p
eriodic ins
p
ection and
p
rovide re
g
ular maintenance to ensure the satisfactor
y
p
erformance of the structure.
Stainless Steel
Structural Connectors Coating Recommendations
Triple Zinc (G-185)
8,9
,
HDG (post hot dipped),
Exterior Coat
12
Triple Zinc (G-185),
HDG (post hot dipped),
Exterior Coat
12
or
MiTek Gold Coat
Triple Zinc (G-185),
HDG (post hot dipped),
or MiTek Gold Coat
Triple Zinc (G-185),
HDG (post hot dipped),
or MiTek Gold Coat
5
Example
Applications
Use
Environment
Service
Conditions
AWPA
9
Use
Category
Preservatives and
Retentions
6,7,10
Minimum Coating
Requirements
1,2,3,4
Deck posts, beams
and joists. Fresh water
docks
11
The Structural Connectors Coating Recommendations chart below
was developed by reviewing eld service performance and accelerated
corrosion test results. They are offered as general guidelines and are not
intended to cover all possible service conditions. Additional consideration
may also be needed for:
wet service conditions
preservation treated lumber
re retardant treated lumber
strength reducing chemicals
building near salt water coastal areas.
Additionally, the Corrosion Protection Guidelines to the right may also
be used to assist in making the proper choice of corrosion protection.
The building designer/engineer has the ultimate responsibility of selecting
the most viable protective coating based on knowledge of project specic
corrosive environments and local building code requirements.
Corrosion Protection Guidelines:
• MiTek recommends stainless steel connectors for the highest level of
corrosion protection. As an economical alternative to stainless steel
our new Gold Coat connectors are specically designed for exterior
application when in contact with preservative treated wood.
• For connectors in contact with preservative treated wood, the Triple
Zinc option provides the minimum G-185 coating thickness required
by code and is an economical alternative for exterior applications.
• The use of correct fastener with the connector is critical. Stainless steel
connectors require stainless steel fasteners. For exterior applications,
hot-dip galvanized fasteners (HDG) or exterior coat (EXT) must be
used with both Triple Zinc and hot-dip galvanized nishes. Gold Coat
connectors require gold coat or hot-dip galvanized fasteners.
• MiTek’s zinc dichromate WS Wood Screws are not recommended for
use with preservative or re-retardant treated wood. Some wood
screws are available in Gold Coat or exterior coat.
• MiTek clearly differentiates standard interior G90 connectors from the
corrosion resistant connectors. Gold Coat connectors are distinguishable
from other connectors due to their gold color.
Continued on next page
Structural Connectors Coating Recommendations