Description
Description:
Expoband One is a non-reinforced Hypalon membrane incorporating a central release tape, available in 1mm thickness and widths of 100mm and 200mm. The 1mm thick membrane is supplied in a 25 meter roll. It is bonded to the structure on both sides of the joint using Nitomortar FC two-part epoxy adhesive.
Uses:
Expoband One is a Hypalon membrane system which is designed to be bonded over movement joints or cracks in structures to prevent the passage of water. It is bonded in position using Nitomortar FC two-part epoxy adhesive. Expoband One is suitable for construction use and in repair/remedial applications
Advantages
- Accommodates continuous and pronounced cyclic movement
- Excellent resistance to weathering
- Can be applied to dry or damp surfaces
Technical Support:
Fosroc offers a comprehensive range of high performance, high quality technical products. In addition, Fosroc offers a
technical support package to specifiers and contractors which includes computer-aided design (CAD), standard details as well as on-site technical advice from staff with unrivalled experience in the industry.
Design Criteria:
Example of a reservoir wall, sealed internally with Expoband One
- Expoband One
- Nitomortar FC
- Super cast Water stop
- Hydrocell
- Thioflex 600 or Nitoseal MS600
Also available from Fosroc
Maintenance:
There are no special requirements, however any damage should be repaired by exposing the damaged area, cleaning
the surface and replacing the strip.
Properties
Form: Elastomeric Strips
Colour: Light Grey
Density: 1.4 ± 0.1 approximate
Tensile Strength: 7 N/mm²
Elongation at break: 400%
Adhesion to concrete: tensile strength of
(With Nitomortar FC) substrate
Specification clauses:
Where indicated on the drawings, joints shall be sealed with Expoband One flexible expansion joint membrane system
supplied by Fosroc. Expoband One shall be installed strictly in accordance with the manufacturer’s printed instructions.
Application instructions
Joint preperation
Expansion joints must be packed with a firm, consolidated joint filler prior to laying the Expoband One. If necessary, joints
may be pre-sealed using a bituminous or elastomeric sealant. Ensure that any sealant used is capable of accommodating
the anticipated joint movement. Where Expoband One has to be turned up parapets and the like, a splay should be provided so that the change in direction is smooth and progressive.
Surface preperation
Concrete surfaces onto which the Expoband One is to be laid must be sound, frost and dust free. New concrete must be
fully cured and free from curing compound. The concrete surface ideally should be wood float finished for the width of
Expoband One and free from irregularities, with well deigned arrises and no vertical misalignment between each side of the
joint.
Prepare a suitable width of substrate 50mm wider than the membrane width selected. Sharp arises should be ground
down pencil round.
Remove all dirt, dust and laitance by rigorous wire brushing needle gun, abrasive blasting or grinding. Any spalling or
honeycombing must be repaired prior to the application of the Expoband One system. Should the substrate be wet, dry
gently with a gas torch or hot air blower. Dampness should not re-appear within 15 minutes for the substrate to be considered as being dry enough for the application of the Nitomortar FC. A maximum 25 mm width of masking tape applied adjacent to either arris will provide an increased unbonded width and greater movement potential if required.
Priming of concrete
Priming of concrete is not normally required with the Nitomortar FC / Expoband One system. The use of Fosroc Primer
MS2 should be considered where there could be doubt about porosity or condition of the concrete. Apply Fosroc Primer
MS2 by brush, working well in, to a width of 25 mm either side of the membrane. Fosroc Primer MS2 should be left for about 40 to 60 minutes (depending upon temperature) to allow evaporation of the primer solvent prior to the application of the
Nitomortar FC adhesive.
If the primer has been left longer than 8 hours or has become contaminated with dust, the surface must be reprimed.
The rate of cure of Fosroc Primer MS2 is temperature dependent. Ideally the substrate should be above 10°C to
ensure a reasonable cure rate, however this primer can be applied when substrate temperatures are 5°C and rising.
Preparation of the membrane
This operation is vital to the adhesion and performance of the Expoband One system. Measure and cut the length of
Expoband One to suit the joint. The Expoband One Hypalon membrane must be prepared by thoroughly wiping both faces
with Fosroc Solvent 102 and a clean cloth. DO NOT use excessive quantities of solvent. Allow 1 hour to dry before placing.
Mixing and application of the adhesive
Transfer the entire contents of Part B of Nitomortar FC adhesive into the Part A container and mix thoroughly using a
slow speed drill and Fosroc paddle stirrer for 4 minutes, stopping to scrape down the sides of the container. When
mixed, the adhesive should be a uniform grey color. Use masking tape at extremities and along centre line of joint.
Apply mixed Nitomortar FC using a serrated spreader. Apply to entire primed area, if not primed apply 25mm either side of
membrane. Remove central masking tape immediately and position Expoband One membrane into the Nitomortar FC
adhesive.
Roll firmly to displace trapped air and to ensure extrusion of Nitomortar FC through the edge perforations. Apply a second layer of Nitomortar FC to the full width of the top surface of membrane. Remove central release film from membrane. Finally remove outer edge masking tapes and featheredge the Nitomortar FC.
Note: Nitomortar FCFS can also be used as an adhesive if fast setting is required.
Jointing the Expoband One membrane
The surfaces to be jointed must be clean, buff thoroughly both surface of membrane to be jointed, make sure there are no
bright areas. Remove buffing dust without using any fluid. A 100mm overlap is required. Thoroughly mix the required quantity of Expoband Jointing Adhesive (Mix ratio of base to hardener is 96:4) until a homogeneous mixture is obtained. Use the mixture within pot life of 2 hours. Apply 2 even and thin coats onto each bonding surface. Allow the first coat to dry completely (approximately 30 minutes at 25 °C) before applying the second coat. Let the second coat dry until it slightly tacky (check with the back of your finger). Press surfaces together firmly and roll out using a solid roller. Ensure the two faces are completely fused together. In case the second coat over-dried, apply another coat and allow this to become tacky. After application the Expoband One system should be allowed to cure for 14 days at 20 degrees C (7 days at 35 degrees C) before permanent contact with water.
Ancillary materials and equipment
- Nitomortar FC.
- Nitomortar FCFS.
- Fosroc Solvent 102.
- Fosroc Primer MS2.
- Slow speed drill and Fosroc paddle stirrer.
- Adhesive spreader with 2 to 3 mm serrations.
Limitations
Joint layouts incorporating Expoband One should be kept as simple as possible to allow for site joints to be restricted to
straight butt joints. Avoid complex changes of angle or skew giving rise to difficulty in jointing and installation.
Storage
Expoband One should be stored in original unopened packaging, in cool dry conditions, away from sunlight. Fosroc
Primer MS2 should be stored in accordance with the Highly Flammable Liquids and Liquefied Petroleum Gases Regulations 1972.
Precautions
Health and safety
Expoband One There are no known hazards associated with this product in normal use.
Fire
Fosroc Primer MS2 and Fosroc Solvent 102 are flammable. Do not expose to naked flames or other sources of ignition.
No Smoking. Containers should be tightly sealed when not in use. In the event of fire, extinguish with CO2 or foam.
Important note
Fosroc products are guaranteed against defective materials and manufacture and are sold subject to its standard Conditions for the Supply of Goods and Service. All Fosroc datasheets are updated on a regular basis. It is the user’s responsibility to obtain the latest version.
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