Installation Guide

STEP THREE:
PRIOR TO INSTALLATION
Review sealant precautions prior to application.
REPLACING OLD SEALANT: It is recommended to remove old
or damaged sealant from a joint prior to installing new
sealant. Remove sealant by cutting away product with a knife
or razor and follow steps below for preparing the substrate.
SUBSTRATE PREPARATION: Substrate preparation should be
done on the same day you apply the product. Surfaces should
be clean (free of dirt, dust, oils, water repellants and old
sealant compounds), stable (substrate must handle
movement/hold together as the joint moves), dry (free of ice,
frost and standing water), and primed (if required by sealant or
needing additional substrate stabilization) prior to sealing. Be
sure to test any product on the substrate before installation.
Substrate
Joint movement for a 10
foot panel in x/16th of an inch
Wood (parallel to grain)
0.38 to 0.45
Aluminum
2.69 to3.07
Steel
1.41 to 1.66
Stainless Steel
1.29 to 2.21
Copper
2.05 to 2.18
Glass - Plate
1.15
Granite
1.01 to 1.08
Limestone
1.02
Marble
0.70 to 1.80
PVC
6.91 to 14.08
FRP
3.20
Polyurethane
7.37
Polycarbonate
8.32 to 8.96
Acrylic
8.70 to 9.60
Concrete
1.25 to 1.79
Brick Masonry/Mortar
0.60 to 1.15
STEP TWO: CAPABILITIES
ENVIRONMENT: Environmental stresses such as UV light,
temperature extremes, humidity/moisture levels, physical
stress such as creep (permanent) and elastic (temporary)
deformation due to wind and other variable loads and others
all affect joint movement.
CLASS: ASTM C920 Class can be used to determine if the
sealant has enough “stretch” to handle the dynamic joint in
question. ASTM C920 incorporates a number of tests that
determine cyclic movement on a number of substrates
ESTIMATED MOVEMENT:
Find the joint movement in the table based on your intended
substrate.
Recommended Joint Width = Joint Movement x (100/Class of Sealant)
It is recommended to install joints at midpoint of joint movement,
which will be at the midpoint of temperature extremes, giving you
equal joint movement during both ends of the temperature range.
For more detailed information on joint design, we recommend
reviewing the most recent additions of 1) ASTM C1193 Standard
Guide for Use of Joint Sealants and 2) ASTM C1472 Standard
Guide for Calculating Movement and Other Effects When
Establishing Sealant Joint Width.
BACKING MATERIAL:
Backing material is recommended for the best performance of
watertight joints.
Ideally, joints will be designed to accommodate a backing rod,
as this is the preferred method of installation.
See STEP FOUR for installation information.
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CONSIDER TEMPERATURE:
Sealant should be applied within the specified temperature
range stated on the product label. Not doing so may alter the
application and resulting performance of your product.
For best performance, apply sealant at the mid-range of
expected temperature extremes. This will minimize joint
movement in each direction, reducing stress on the sealant
(see troubleshooting).
Do not apply product in hot and dry conditions, or when heavy
rain or freezing temperatures are anticipated.
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