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Elastostrip Joint Sealant

The Product

Elastostrip is a polymer modified bitumen sealing strip. Elastostrip is made in various profiles designed to seal all types and sizes of joints in precast concrete manholes, box culverts, inspection chambers, pipes etc. Plastoelastic properties and high adhesion provide a permanent watertight seal during and after settlement, ground movements, side loadings etc. Elastostrip is resistant to sulphates, acids, alkalis, salts, groundwater, trade effluent, grease, sewage and micro-organism.


Elastostrip enables the contractor to install watertight culverts, manholes and other precast concrete structures quickly and economically without the need for in situ concrete surrounds while still meeting full life cycle durability requirements. Elastostrip is supplied in rolls with siliconized release plastic. Elastostrip is created after many years of research and development work made together with leading precast concrete manufacturers.


Elastostrip has been tested in applicable parts based on standards like DIN 4062 and functional needs. Also tests are carried out by concrete manufacturers showing that Elastostrip meets the requirements of EN 1917 (new European standard for concrete manholes and joints.) This enables the concrete manufacturer to supply units that meet the new standard.


Elastostrip is used to joint precast concrete box culverts, manholes, inspection chambers, shafts, caissons, tunnels and ogee pipes.

Hot work

Heating is a hot work that must strictly comply with the protection and safety guidelines of insurance companies.



Apply Elastostrip, ensuring that all joint faces are clean and dry. It may be necessary to warm Elastostrip with a gas torch to increase tack.


Apply Elastostrip of the correct size to the joint, as shown in the drawings below.


On box culverts and ogee pipes heat the surface of the Elastostrip with a gas torch to obtain initial adhesion if needed. Don’t heat more than to get the surface oily.


Positioning of Elastostrip

On box culverts position the trapezoidal (wedge shaped) section of Elastostrip to cover the sloping face of the socket. The traditional rectangular cross-sections which are smaller should be positioned on the middle of the sloping face of the socket.


On ogee pipes position the Elastostrip on the sloping face of the spigot.

Joining Elastostrip

On manholes, box culverts and ogee pipes join the ends of the strip in a scarf joint by overlapping the ends then cutting through at 45° with a hot knife, playing a flame on the cut faces and smoothing over.


On box culverts cut the strip into the corners with a mitre joint.

Manholes and inspection chambers

On manholes with tongued and grooved joints of DN 1350 to 3000, use two layers of strip on the base and top joints. On all manholes and inspection chambers trim off any excess compound which extrudes internally.


On manholes the imposed loading from the upper units should be sufficient to compress the Elastostrip. Ensure that the Elastostrip is compressed by at least half its thickness before any water test.

Box culverts and ogee pipes

On box culverts and ogee pipes close the joint to an internal gap of 10 mm using a mechanical cable puller. The trapezoidal Elastostrip will fill the joint in the middle and inside on box culverts and in the middle and outside on ogee pipes. Any squeeze-out should be cut off and smoothed flush to the wall or to the back of the caulking groove.


If a joint should leak, check for gaps between the ends of the strips or poor fit between the concrete units.

Frost damage prevention

Encase the two top rings with regular wide plastic wrap. This way the frost can not get a hold on the concrete rings and lift them up by force.


The surplus product can be disposed of as normal industrial waste.

The plastic wrappings and cardboard box can be recycled.

More information

Download: Elastostrip brochure

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