- All clear spans 5.0m and over should be propped in the centre during the casting of the joints.
- All clear spans over 5.0m require a structural topping on the slab in addition to concrete in the joints.
- Props should be left in position for a minimum of 10 days after the casting of joints and topping.
- External walls at first floor level can be built while props are in position. Internal walls which are supported by the slab (i.e. no wall underneath) can only be constructed after props have been removed.
- Openings up to 2 metres wide can be covered by a lintel plus five courses (with brickforce in between the courses). This is suitable for the support of slabs up to 7.8m long. Openings wider than 2 metres should be referred to the engineer for the detailing of additional structural steel support.
- Bearing for 200mm deep beam or channel or angle – 220mm minimum on brickwork on either side of opening.
Bearing for 250mm plus deep beams – minimum 330mm on brickwork on either side of opening.
- Cantilevers:
a) Steel is required in a structural topping on all cantilever panels.
b) For an Echo slab, twice the length of the cantilever must sit on the building
c) For a steel beam or channel, three times the cantilever length must sit on the building.
d) Cantilevers up to 1.8m long can be done with Echo slabs with a structural topping and reinforcement.
- Where Echo slabs are used as roof slabs, balconies, external walkways or flat roofs, we recommend a minimum reference 100 mesh in the screed/topping over the slabs.
- Where the Echo slab soffit is to be plastered, we recommend a minimum reference 100 mesh in the screed/topping over the slabs together with a fibreglass bandage over the V joint on the soffit.(see Finishes to "Echo Floors" slabs). A mastic filler may also be used.
- It is reccomended that either a textured paint or Tyroleen finish is used on the soffit of the slabs.
- Echo Floors keep stock at all times, in lengths of up to 8.2m in 100mm increments. Standard width 900mm and depth of 150mm.
- The slabs are cut to shape and size to suit your building.
- Maximum clear spans should not exceed 6.8m
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