roof-membrane integration flanges
fastening—adhesion or welding & termination
• Heat welded
transitions at tees, crosses, roof-to-wall, etc.
SEISMIC COLORSEAL wall joints
addresses wall joint to roof joint interface
• TPV or PVC
for broadest compatibility with PVC or TPO sheet
membranes, as well as asphaltic and thermoset rubber roof
Black or Reflective White
and Movement Capability
Joint-Gap In Field
1-2 inches (25-50mm)
*Note: Movement as a
percent of joint size is affected by the joint-size into which
the RoofJoint installed. In general it is safe to assume
that the RoofJoint is capable of 100% movement of
mean-temperature joint size. Consult EMSEAL for specific
EMSEAL RoofJoint, roof expansion joint, is a dual-seal, double-flanged, extruded thermoplastic
rubber system for sealing expansion joints in roofs. Watertightness is
achieved through positive integration with the roofing membrane and a
purpose-designed system for transitioning between the joint in the roof and
joints in walls.
The waterproofing elements of roof expansion joints currently are looped
membranes. The loops either hang down into the joint in the case of
metal-cover systems, or are humped up by means of a foam backing. Either
way, while they look good in cross-section, looped membranes don’t work well
at the transition from the roof joint to wall joints.
EMSEAL’s decades of experience lies in sealing parking and plaza deck joints
with systems that sit in the joint.
As with the products used for these other critical waterproofing
applications, an extruded joint profile that incorporates redundant levels
of sealing, low-strain compression and extension capability, and a broad
cross-section that can be welded to ensure continuity of seal in changes in
plane and direction, are the hallmarks of EMSEAL’s RoofJoint system.
Unique to EMSEAL’s RoofJoint is the double-level flange. This flange
configuration facilitates multi-layered, watertight integration with the
The lower flange is welded or adhered to the roof membrane brought up to the
joint. A termination bar and anchors mechanically locks the flange to the
roof decking or blocking.
The upper flange counterflashes the termination bar and underlying membrane
ensuring that penetrations made by the attachment of the termination bar are
completely sealed. The upper flange is further flashed to the roofing
membrane by means of the roofing manufacturers’ standard flashing tape or by
over-welding a strip of roofing.
Movement at the joint is accommodated by the folding design of the gland.
The double-cell configuration ensures redundancy in sealing.
The geometric shape is purpose-designed for the lowest strain during
movement to ensure longevity.
RoofJoint Composition - PVC or TPV
RoofJoint is available in two formulations:
a PVC-Thermoplastic alloy or TPV (Thermoplastic Vulcanizate).
Manufactured for direct welding to PVC-based roof membranes; for adhesion
into hot or cold-applied asphaltic systems; and for adhesion to thermoset-rubber roof membranes (EPDM,
The PVC version of RoofJoint is extruded from a thermoplastic PVC alloy. Unlike typical PVC’s this blend is
recyclable. While other
PVC’s can be down-cycled (made into something lesser than the original part)
the RoofJoint, during die balancing for example, can be ground up and put
directly back into the extrusion stream. This assures virtually no waste in
Its composition is based on ultra-high molecular weight PVC resins. This family
extends the performance of flexible PVC by providing improved toughness,
abrasion resistance, compression set resistance and low-temperature
A PVC thermoplastic blend was chosen for this product for its compatibility
with most known roofing systems.
It can be heat-welded to PVC roofs, and subject to the recommended
procedures of the particular roofing membrane manufacture in respect to
preparation, cleaning, priming, etc., adheres well to the accessories of all
adhered (sheet-goods), and asphaltic (hot or cold applied) systems.
TPV (Thermoplastic Vulcanizate)
Manufactured for welding to TPO (Thermoplastic Olefin)-based roof membranes,
the TPV version of RoofJoint, is offered for its ability to be welded to TPO
At least 100% (+50%; -50%) of nominal joint size at mean temperature for
joints from 2 to 4 inches (50 - 100mm) wide.
(NOTE: Movement is affected by the joint size into which it is designed.)
Continuity of Seal
As with all EMSEAL expansion joint systems, continuity of seal is extended
to crosses, tees, upturns, downturns, roof-to-wall, and other compound
conditions typically found in construction projects.
Factory-fabricated transition pieces can be welded to straight lengths in
our plant wherever field measurements are provided or can be butt-welded to
straight lengths in the field using simple equipment and training available
from EMSEAL. All welds are strengthened with reinforcing strips.
Solid-Wall RoofJoint Closure
This factory-fabricated transition piece is manufactured from SEISMIC
COLORSEAL wall-expansion joint material from EMSEAL. This single unit
piece has factory-coated silicone bellows on the top and upper-back
faces for integration with SEISMIC COLORSEAL in the wall and HORIZONTAL
COLORSEAL as a secondary seal and insulator across the roof.
silicone-coated top side of the closure is shaped to match the underside
of the RoofJoint extrusion. The Solid-Wall RoofJoint Closure is
installed before installing the RoofJoint. It is installed ¾” down from
the roof deck or wood blocking surface. A sealant band of silicone is
applied across the upper mating surface of the closure. The RoofJoint is
then installed. The underside of the RoofJoint will mate with the top of
the already installed closure.
Cavity-Wall RoofJoint Closure
Like the solid-wall closure, the cavity-wall RoofJoint closure, is a
factory-fabricated transition piece made from SEISMIC COLORSEAL.
The difference is an extended,
horizontal setback portion of coated foam to bridge the cavity from
facade to structural backup wall. The sides of the “bridge” are
additionally coated with silicone to seal them against moisture in the
cavity and to constrain the lateral expansion of the foam into the
RoofJoint is ideally suited for use in sealing the structural slabs beneath
green, vegetative roof assemblies. Because the growing medium is loose,
compressible and granular, movement that occurs at the structural slab can
be absorbed without detrimental effect in the green roof overburden.
Limitations--Not for Hardscape Plazas
RoofJoint is for use in roof decks only. It is not intended for use in
split-slab, podium, or plaza deck design.
This is because there is no inherent capability within RoofJoint to
separate--topping slab, pavers or other rigid wear course materials from one
another at the deck surface to properly accommodate movement in the wear
For split-slab, podium and plaza deck design see the FP (For Plaza) series
of expansion joints from EMSEAL: Migutan FP-Series, DSM-FP Series, SJS-FP
series or SJS-FP-FR Fire Rated Series. If designed for installation into the
structural slab of a split-slab or plaza deck design, EMSEAL takes no
responsibility for buckling pavers or cracking or binding in topping slabs that will occur
as movement from the structural slab is referred through the wear course.
Insulation in the joint opening beneath a roof expansion joint is critical
in maintaining energy efficiency in the structure. Insulation under EMSEAL’s
RoofJoint can be achieved in two ways:
(Specify and Install
HORIZONTAL COLORSEAL Beneath the RoofJoint)
The advantage of this solution is that in addition to insulating, the
HORIZONTAL COLORSEAL provides an additional watertight barrier
beneath RoofJoint that ties into the SEISMIC COLORSEAL RoofJoint
transition piece and further ensures continuity of seal and insulation with the wall
The R-Value of HORIZONTAL COLORSEAL is 2.15 per inch of depth.
Therefore in 4-inch joint, HORIZONTAL COLORSEAL has a depth of 4.5
inches and an R-Value of 9.675. To increase the R-Value of any size of HORIZONTAL COLORSEAL, specify an increased custom depth.
|Insulation Method 2
(Batt Insulation and Looped
Membrane by Others)
By installing a looped membrane of standard roofing material (by others)
to support fiberglass or mineral wool insulation batts before installing
commonly done, this solution provides no continuity of R-value with the
wall expansion joint and is additionally subject to insulation value
loss through moisture retention due to condensation accumulation in the