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High density 20H SYSTEM impregnated expanding foam sealant for
below-grade wall applications. |
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***Note: The 20H
SYSTEM has been largely replaced for deck joint applications by the
DSM SYSTEM.
With its introduction in
2006 the
DSM SYSTEM supersedes it's predecessors, 20H SYSTEM and DSH SYSTEM, in
most applications.
The DSM SYSTEM builds on a track record of over 30 years of sealing
horizontal plane joints with impregnated foam sealants and is an evolution
of EMSEAL’s earlier technologies. The DSM SYSTEM features greater movement
capability, dual sealing, a fuel resistant silicone bellows coating, better low temperature flexibility, and improved high
temperature stability. It achieves these improvements through EMSEAL’s new
microsphere-modified-acrylic impregnation technology and is free of any asphalt
compounds. Additionally, the DSM SYSTEM is totally free of wax or wax
compounds. Consequently the suitability of the DSM SYSTEM is extended
geographically as well as to applications such as in metal-angles, and
top-decks previously not recommended for joint-face-adhered systems.
The 20H SYSTEM continues
to be well-suited for installations in below-grade, positive-side wall joints***
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Sealing Below-Grade
Walls using the 20H SYSTEM:
The 20H
SYSTEM is installed from the positive side of the retaining wall into a
pre-formed joint opening in cured concrete. The joint opening would be
formed with extruded polystyrene that is stripped out from between the
cured joint faces deep enough to receive the 20H foam (3-inches for
2-inch nominal 20H for example).
The 20H SYSTEM is installed flush to the face of the positive side of
the wall. The the below-grade waterproofing membrane and drainage board
are installed over the 20H SYSTEM using the membrane manufacturers
standard inverted, slip-sheet, detail.
While it is not necessary from a waterproofing standpoint to fill the
joint on the interior (negative) side of the wall it is wise to seal
this joint to keep vermin out. The 20H SYSTEM is fine for this purpose
however, if the aesthetic of a black joint filler is a concern, use
COLORSEAL
on the interior.
As
far as ensuring watertightness is concerned, it is very important to
thoroughly detail and specify the termination of the waterproofing
membrane AND the 20H SYSTEM at the wall footing. It is best to carry
both the membrane and the 20H SYSTEM below the elevation of the interior
floor or slab and into a well-designed drainage perimeter (gravel, tile,
etc.). This will ensure that water running down the wall in the
drainage board and/or on the membrane and 20H SYSTEM is properly drained
away does not back up against the wall.
The 20H
SYSTEM
consists of 20H foam, epoxy adhesive and topcoat.
Permanently elastic, high-density, cellular polyurethane foam,
impregnated with water-based, polymer-modified
asphalt, compressed to approximately 20% of its uncompressed dimension.
Supplied pre-compressed to smaller than mean joint size; installed flush
with, or near to surface into wet epoxy adhesive,
the material expands to seal the joint.
Exposed top surface is treated with Topcoat
flexible coating to enhance sealing and durability. |
General Contractor Expansion Joint Responsibilities
Division 3 Addendum (.doc)
The EMSEAL Expansion Joint Checklist (.pdf)
(For help in making a product selection, or to
accompany an order
click
this link to open, complete, and email our new universal checklist).
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Meet online now:
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Expansion joints and
precompressed joint
sealants by EMSEAL
1-800-526-8365 -- 508-836-0280 --
techinfo@emseal.com
-- Fax: 508-836-0281
EMSEAL JOINT SYSTEMS LTD. 25 Bridle Lane, Westborough, MA 01581
EMSEAL LLC. 120 Carrier Drive, Toronto, ON M9W 5R1
Last Modified:
February 06, 2012
Copyright © 1998-2012 by EMSEAL
Joint Systems, Ltd. All rights reserved.
This document may not be reproduced in whole or in part without permission.
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