Expansion Joints and Pre-Compressed Sealants
Watertight & Traffic Durable
through its side flashing sheets with the deck waterproofing
systems of split slab, concourse, and plaza deck design.
suited to joint openings between split-slab and solid slab construction
Uniquely suited to deck-to-wall and deck-to-column conditions in
Straddles structural joint-gaps 1/2"
Note: Sizes under 1 1/2" (40mm) are manufactured with a single bellows.
Larger sizes incorporate multiple bellows
(For larger than
Total 55% movement capability: +30% and -25% of nominal supplied size.
DSM-FP is a trafficable joint system for use in plaza decks and
split slabs. It is watertight, and sound-dampened designed for expansion
joint gaps measuring 4-inches and less.
DSM-FP System is designed to provide a
watertight, trafficable joint system
in smaller 1/2" (12mm) to 4" (100mm)
joint openings, in decks of split-slab
design. DSM-FP expands the use of the
DSM SYSTEM to
deck designs through the use of side flashing sheets that integrate with
the deck waterproofing membrane.
• For new construction and retrofit of old or failed joint systems.
• For restoring watertightness to chronic leaking over occupied spaces.
• Uniquely suited to joint openings between split-slab and solid slab
• Uniquely suited to deck-to-wall and deck-to-column conditions in
• Plaza and podium decks
• Split slab or asphalt-overlay parking decks
• Airport roadways
• Mall bridge connectors
• Stadium concourses, etc.
• The system consists of two subassemblies: 1) The structural-slab mounted
supporting legs with integral waterproofing side sheets; and 2) the joint
sealing silicone-faced foam.
• The mounting leg assembly is delivered with opposing legs
factory-set to the nominal joint size. It is installed onto a wet-setting
bed of epoxy mortar and bolted to the deck.
• The factory-assembled bellows and foam manufactured
at applicable widths and depths
from the factory.
• Epoxy gel adhesive is applied to the faces of the previously
installed mounting leg assembly.
• The DSM SYSTEM precompressed foam sealant is installed into the joint gap where
it self expands into the wet epoxy adhesive.
• Consecutive lengths are joined through the
field-application of manufacturer-supplied, low-modulus, high-movement
silicone to the intersecting bellows surfaces.
• A field-applied silicone sealant band is injected at the
bellows to joint substrate interface to complete the waterproofing.
With the DSM-FP side flashing sheets pulled out of the way, the deck
waterproofing membrane is installed on the deck and brought
over the top of, and up the DSM-FP mounting leg.
The side flashing sheets are lowered into the liquid
membrane (or into the non sag mastic component of a sheet waterproofing
system) and sandwiched with another layer of waterproofing. Drainage
board and/or protection board are added in accordance with the
• Concrete, pavers, asphalt, or other topping slab or
wearing course material is installed up to the stainless steel retaining
caps on the DSM-FP mounting rails with or without a field-applied sealant
control joint depending on the wear-course material (consult EMSEAL).
The material that bridges and
seals between the DSM-FP mounting rails is
DSM SYSTEM which is
comprised of silicone-and-impregnated-foam hybrid components that ensure watertightness, absorb sound, dampen vibration and offer uncomplicated
installation. DSM is the
latest evolution in the field-proven technology that EMSEAL
has used for 30 years of sealing horizontal plane joints with
impregnated foam sealants.
Watertight – The tensionless silicone bellows are
installed essentially flush to the deck surface just below the stainless
steel capping strips thereby ensuring watertightness at the
wear-course surface. This eliminates the need for secondary moisture
barriers and gutter systems.
Continuity of Seal – All EMSEAL expansion joint systems feature
continuity of seal
changes in plane and direction –– an essential performance
differentiator. Fabricated transitions
from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are
available with the DSM-FP.
Split-Slab to Solid-Slab Connections
DSM-FP is an effective watertight expansion joint for
bridging split-slab and solid-slab construction. The watertight
precompressed DSM foam sealant is held securely in place by utilizing the
back-pressure of the expanding foam, epoxy adhesive, and a field-injected
silicone sealant band at the substrate interface. The connection to
solid-slab construction is made directly to the slab substrate. The
split-slab connection is made to the DSM-FP mounting leg. The split-slab
connection incorporates an integral waterproofing flashing side flashing sheet
embedded between layers of the deck waterproofing membrane on the structural
slab and beneath the topping slab.
to Split-Slab / Deck to Deck
(R) Wall/Column to Split-Slab
Joint Sizes: Because DSM-FP installs into its own legs, the
legs can straddle mean-temperature, structural slab, joint sizes as small as
is determined by the designer to meet deck movement criteria.
Joints straddled by the DSM-FP system could be as small as 1/2-inch
and up to 4-inches
The minimum gap between the DSM-FP legs is 1-inch
(For joints larger than
As seen above, the width between the legs of the DSM-FP installed in the topping slab
does not need to necessarily be the same as the joint gap in the lower
structural slab. The lower gap should be no wider than the width of the DSM-FP
foam above it, although cantilevered leg options can be configured to suit
special conditions--consult EMSEAL.
Performance & Selection
Movement Capability: 55% (+30% and -25%) of nominal
Leg Heights: 3 3/16" inches
Note: As joint width increases so does the depth of the DSM precompressed
foam--minimum leg heights for wider joints will be determined by the depth
of the DSM foam.
For a similar system with a built-in, up to 2 hour fire rating ask
EMSEAL about the
Model selection is designated by product codes. The code
segments relate to the product configuration: For example,
Consult EMSEAL for model number suitable to your specific