Waterproofing of structural joints

Great care is a "must" for structural wall joints separating buildings and for dilatation joints in case of external basement waterproofing. They are a challenge for the planner and the contractor. Weber offers tailor-made solutions with its sealing tape systems for all cases of water load.

Step by step


    1. The sealing tape weber.tec Superflex B 240 E (with end T-piece) is used for the waterproofing of structural separation walls between buildings, for ex. in semi-detached houses with an end-to-end floor slab. The tape is fleece-covered on both sides and at both ends. When cutting the tape in the middle, two 3-m long tapes are obtained with one end piece each. The fleece-reinforced sides are glued with polymer-modified bitumen thick coatings PMBC) or epoxy resin on both sides.


    2. After priming apply the PMBC in a 3 mm-layer on both joint sides with a flat trowel. Lay the sealing tape with the wide fleece side facing the wall onto the fresh bitumen layer without delay.


    3. Cover the fleece-covered  sides with a 3 mm-layer of the same PMBC.


    4. The waterproofed joint sides are subsequently incorporated into the waterproofing layer of the main surfaces on walls.


    5. Butt joints, mitres and connections are obtained by heating the middle part (PVC) of the tape with an air-heating blower (approx. +350°C up to 450°C). Prior to heating clean the tapes with the thinner weber.sys 982.


    6. The sealing tape weber.tec Superflex B 400 (without end T-piece) is used for wider joints. It is convenient for being bonded into hot bitumen or in connection with bitumen felts, for ex. on earth- contacting concrete ceiling slabs (for ex. above underground parking decks). Bonding is done with the 2-comp. epoxy resin adhesive weber.xerm 848.


    7. Lay the sealing tape with the narrow fleece side facing the concrete. When bonding with the epoxy resin, use the 2-comp. epoxy resin primer weber.prim 807. In all cases the middle part of the tape must remain free of glue. In case of expected large dilatation movements lay the tape in a so-called "omega- loop" over the dilatation joints.


    8. Overcoat the tape sides with the EP adhesive weber.xerm 848. For buildings with horizontal and vertical joints, it is necessary to lay the water-proofing material continuously from the horizontal concrete slab up to the wall surface in order to avoid unnecessary joints.