EXPANSION <—> CONTRACTION
Accommodate expansion-contraction cycles to
minimize stress damage in concrete.
SEALTIGHT Control Joints are offered in a variety of materials (i.e. fiber,
asphalt, cork, self-expanding cork, sponge rubber and flexible foam). Control
Joints accommodate movement at predetermined locations to prevent the
development of stresses from contraction or expansion that could damage the
For additional SEALTIGHT Control Joint products, refer to SEALTIGHT Fibre
Expansion Joint Filler Catalog No. 320-F, SEALTIGHT Premoulded Tongue and Groove
Joint Catalog No. 321, SEALTIGHT CERAMAR Flexible Foam Expansion Joint Filler
Catalog No. 323 and SEALTIGHT Vinyl Contraction Joints Catalog No. 324.
Minimize stress damage and enhance the performance capabilities of concrete with
proper jointing techniques to accommodate expansion-contraction cycles.
Concrete expands and contracts with temperature and moisture changes. As the
temperature rises or the moisture content of the concrete increases, expansion
takes place. As the temperature drops, the concrete will contract.
The provision to accommodate movement at predetermined locations with proper
joint applications, prevents the development of stresses that could rupture the
Joint type and spacing will vary with each project according to the type of
structure, climatic conditions and anticipated stresses in the concrete. The
coefficient of thermal expansion in concrete is 0.0000055 per linear inch of
concrete per degree Fahrenheit of temperature change yielding approximately .66
inch of movement per 100 feet with a 100ºF (38ºC) temperature range.
To estimate expansion, multiply length in inches x number of degrees of
anticipated temperature differential x 0.0000055. Use the resulting anticipated
movement to determine correct thickness of the control joint and proper spacing
for placement of the joint.
Thinner joints (1/4", 3/8" or 1/2") (6.35mm, 9.53mm or 12.7mm)
spaced at frequent intervals offer greater control than thicker joints spaced at
greater intervals. The basic concept is to provide ample room for the concrete
to expand and contract without creating damaging stresses and resultant
Expansion and Contraction Joints
SEALTIGHT ASPHALT EXPANSION Joint Filler is
composed of a blend of asphalts, vegetable fibers and mineral fillers formed
under heat and pressure between 2 asphalt-saturated liners. It is waterproof,
permanent, flexible and self-sealing.
SEALTIGHT FIBRE Expansion Joint is composed of cellular fibers securely bonded
together and uniformly saturated with asphalt to assure longevity. Fibre
Expansion Joint is versatile, resilient, flexible and non-extruding. When
compressed to half of its original thickness, it will recover to a minimum of
70% of its original thickness.
SEALTIGHT CERAMAR Flexible Foam Expansion Joint Filler is composed of a unique
blend of isomeric polymers in a very small, closed-cell structure. Gray in
color, CERAMAR is a lightweight, highly flexible and resilient material offering
recovery qualities of over 99%. This mini closed-cell structure is virtually
non-absorbent. It can be wrapped or formed around curved or circular surfaces.
SEALTIGHT SPONGE RUBBER Expansion Joint is produced to a uniform thickness and
density from gray-colored, top-quality, blown sponge rubber. It is easily
compressed and has a recovery of 95% or more of the original thickness and a
density of not less than 30 pounds per cubic foot (480.56 kg per cubic meter).
SEALTIGHT STANDARD CORK Expansion Joint Filler is produced from clean, selected,
granulated cork bonded with a phenolic resin. It is highly resilient, will
compress without extrusion and recover to 95% of its original thickness after
SEALTIGHT SELF-EXPANDING CORK Expansion Joint is formed and compressed under
heat and pressure to permit expansion up to 140% of original thickness after
installation which permits the filler to compensate for concrete shrinkage.
Normal humidity conditions after installation activate the self-expanding
properties of the cork.
Typical Control Joint Installations
SEALTIGHT Asphalt Expansion Joint can be used
in 80% of all control joint applications. It is ideally suited for joints in
sidewalks, driveways, streets, single and multi-level floor slabs. Due to its
unique self-sealing characteristic, no subsequent joint sealing is required.
SEALTIGHT FIBRE Expansion Joint is ideal for use on highways, streets, airport
runways, sidewalks, driveways, flatwork and scores of commercial and industrial
applications. Use SEALTIGHT SNAP CAP to install 1/2" (12.7mm) below the
concrete surface and seal with SEALTIGHT #164, HI-SPEC or Cold-Applied SOF-SEAL
for maximum protection from water infiltration, weathering and to assure proper
performance. Refer to Catalog Nos. 220, 221, and 224.
SEALTIGHT CERAMAR Flexible Foam Expansion Joint is gray in color and provides an
excellent joint filler and back-up material for use in either horizontal or
vertical applications where expansion and contraction movements must be
CERAMAR is compatible with all currently popular cold-applied sealants, caulks
and hot-pour joint sealing compounds. It is lightweight, highly flexible and
easy to cut or form in the field without waste. CERAMAR compresses easily for
use with shrinkage-compensating concrete and it may be used to relieve stress
and pressure in concrete pavements.
HIGHLY FUNCTIONAL JOINTING AND SEALING SYSTEM: Two excellent SEALTIGHT Products,
CERAMAR and GARDOX Horizontal Sealant, may be used together to provide an
excellent horizontal sealing system for plaza decks, sidewalks, driveways,
commercial and industrial floors. Refer to SEALTIGHT GARDOX Catalog No. 226.
SEALTIGHT Sponge Rubber Expansion Joint is frequently used on bridge structures
and sewage treatment plants that undergo rapid changes in temperature. Because
of its excellent recovery capability, during wide temperature variations, Sponge
rubber is used around supporting pillars, drains, hydrants, lamp and sign posts
as well as in isolation applications or between materials having dissimilar
coefficients of expansion.
SEALTIGHT Standard and Self-Expanding Cork Expansion Joints are used where high
resiliency is needed, such as in sewage plants, flood walls, spillways,
filtration plants and in numerous commercial and industrial applications.
Self-expanding cork is especially desirable where a constant friction-fit is
Advantages and Benefits
|Used in 80% of all control joint situations
|Protects against water infiltration
|Non-extruding... versatile... offers a minimum of 70%
recovery after compression
|A tough, lightweight, easy-to-use, semi-rigid joint
filler available in strips and shapes fabricated to most requirements
|Easy to cut...dimensionally stable...not sticky in
summer, or brittle in winter
|Manufactured in the U.S.A.
|Proven field performance|
|Lightweight, flexible foam...forms or wraps around
curved or circular surfaces
|Cuts easily on the job with a razor knife...no breakage
|Offers high resiliency and 99% recovery qualities...low
compression values... non-extruding... virtually non-absorbent
|Resists ultraviolet degradation
|Non-impregnated...no staining or bleeding
|Bonds easily with common cartridge adhesives
|Compatible with all hot-or cold-applied sealants|
SPONGE RUBBER, STANDARD CORK, and SELF-EXPANDING
|High resiliency with excellent recovery after
|Protects against water infiltration when properly
|Easy to handle and install
|Offers isolation capabilities|
SEALTIGHT Control Joint type and spacing
will vary with each project according to the type of structure, climatic
conditions and anticipated stresses in the concrete. Thinner joints of 1/4"
(6.35mm), 3/8" (9.53mm) or 1/2" (12.7mm) spaced at frequent intervals
offer greater control than thicker joints spaced at greater intervals. The basic
objective is to provide ample room for the concrete to expand or contract
without creating damaging stresses.
The expansion joint should be positioned against forms at interrupting objects
or columns, and against abutting structures prior to the placement of the
concrete. SEALTIGHT Asphalt Expansion Joint should be recessed 1/4"
(6.35mm) below the concrete surface. A sealant is not required.
SEALTIGHT SPONGE RUBBER, CORK and SELF-EXPANDING CORK Expansion Joints should be
recessed 1/2" (12.7mm) below the concrete surface to accept the joint
sealant. To isolate filler from sealant, use SEALTIGHT SNAP CAP (Refer to
Catalog No. 324).
SEALTIGHT Expansion Joints are positioned against the forms, at interrupting
objects or columns, and against abutting structures prior to the placement of
concrete and must be sealed with a suitable SEALTIGHT sealant. SEALTIGHT SNAP
CAP should be installed flush with the surface. After removal of the top section
of the SNAP CAP, the joint opening is ready for sealing.
A joint sealer is not required for Asphalt. For Cork and Self-Expanding Cork
Expansion Joints, suitable SEALTIGHT sealants recommended for horizontal
applications are #164, HI-SPEC, POLY-JET, SOF-SEAL, GARDOX, POURTHANE and
DECK-O-SEAL. SEALTIGHT POURTHANE GARDOX and DECK-O-SEAL are recommended for use
with SEALTIGHT Sponge Rubber Expansion Joint.
Control Joint Specification Data and Size Information
|ASTM D 994
FED. Spec. HH-F-341 F, Type III
AASHTO M 33
FAA Spec. Item P-610-2.7
|ASTM D 1751
AASHTO M 213
FAA Spec. Item P-610-2.7
Corps of Engineers CRD-C 508
Fed. Spec. HH-F-341 F, Type I
5', 6', 12' (1.5,
|ASTM D 1752, Sec. 5.1
through 5.4 with
the compression requirement & modified
to 10 psi (.069 MPa) minimum and 25 psi
(.173 MPa) maximum
|ASTM D 1752, Type I
Fed. Spec. HH-F-341 F, Type II, Class A
AASHTO M 153, Type I
FAA Spec. Item P-610-2.7
Corps of Engineers CRD-C 509, Type I
|ASTM D 1752, Type II
Fed. Spec. HH-F-341 F, Type II, Class B
AASHTO M 15.3, Type II
FAA Spec. Item P-610-2.7
Corps of Engineers CRD-C 509, Type II
|ASTM D 1752, Type III
Fed. Spec. HH-F-341 F, TYPE II, Class C
AASHTO M 153, Type III
FAA Spec. Item P-610-2.7
Corps of Engineers CRD-C 509, Type III
Sheets and cut strips of ASPHALT
Expansion Joint Fillers should be stored on a flat surface. Silicone Sealants
are not recommended for use with SPONGE RUBBER Expansion Joint. NOTE:
SELF-EXPANDING CORK is shipped in waterproof wrappings and confined on all sides
by heavy crating. This packaging should not be damaged or opened until time of
installation. Crates should not be stored for extended periods or exposed to
weather, heat or moisture.
Due to its light weight, CERAMAR may float and should be held in place by
compression or with a mechanical attachment. Read and follow application
information, precautions and Material Safety Data information.
This material last updated February, 2000.
W. R. MEADOWS, INC. warrants that, at the time and place
we make shipment, our materials will be of good quality and will conform with
our published specifications in force on the date of acceptance of the order.
THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY,
EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY
OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the
exclusive remedy for breach of this Warranty, we will replace defective
materials, provided, however, that the buyer examine the materials when received
and promptly notify us in writing of any defect before the materials are used or
incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has
shipped the materials, all our Warranty and other duties with respect to the
quality of the materials delivered shall conclusively be presumed to have been
satisfied, all liability therefore terminates, and no action for breach of any
such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event
be liable for consequential damages. Unless otherwise agreed to in writing, no
warranty is made with respect to materials not manufactured by W. R. MEADOWS,
INC. We cannot warranty or in any way guarantee any particular method of use or
application of the performance of materials under any particular condition.
Neither this Warranty nor our liability may be extended or amended by our
salesmen, distributors or representatives, or by our distributor's
representatives, or by any sales information or drawings.