Esiphiva primary school, kwazulu-natal: new sanitation infrastructure, toilet demolition and associated external works (CIDB 5gb)

Scope

• New sanitation infrastructure and associated external works at Esiphiva Primary School, for the Department of Education through Public Works.
• Contract period: 6 calendar months.
• Priced on a bill of quantities; earthworks, concrete, reinforcement and plumbing/drainage bills are marked provisional.
• Trade preambles follow the Model Preambles for Trades (2008 Edition).

Section 2 — Alterations to existing toilets

• Demolish and remove existing single-storey pitched-roof toilet buildings (concrete surface bed, brick walls, sheet steel roof on timber trusses), including desludging and removal of internal sanitary fittings and plumbing: 3 no. at 2,0 x 1,5 m; 2 no. at 2,15 x 1,82 m; 1 no. at 4,0 x 2,2 m; 2 no. at 4,0 x 2,3 m.
• Break up and set aside existing concrete surface bed or slab: 9 m³.
• Fill existing toilet pits with G7 material in 200 mm layers compacted to 93% Mod AASHTO: 168 m³.
• A desludging certificate must be submitted before payment is released for the toilet demolition.
• Temporary works: 425 m of 2 000 mm high 70% green shade cloth screen; one double swing construction gate 5 000 x 2 400 mm; hire of 2 chemical mobile toilets for 12 calendar months, fully priced.
• Old materials become the contractor's property, with credit allowed in the Final Summary; rubble and unused old materials must be carted away regularly; items designated for handover must be stored and receipted, failing which the replacement value is deducted from amounts due.

Section 3 — Prototype 1A-R (new build)

• Earthworks: strip and stockpile 100 mm topsoil over 84 m²; excavation in earth to 2 m and between 2 m and 4 m; 90 m³ pit holes; 10 m³ raft foundation; soft rock 11 m³ and hard rock 76 m³; cart away 75 m³ surplus to a site nominated by the contractor; backfill compacted to 93% Mod AASHTO; G5 filling 24 m³ under floors and 24 m³ to pit sides; 2 m³ coarse river sand; surface compaction to 95% Mod AASHTO over 73 m²; 14 Mod AASHTO density tests and 14 field density tests including optimum moisture content; soil insecticide to 66 m² under floors and 88 m² to trench bottoms and sides.
• Concrete: 15 MPa/20 mm blinding 1 m³; 25 MPa/20 mm strip footings 3 m³, ramps and aprons 2 m³, bases 4 m³, raft foundation 8 m³; smooth formwork to edges, suspended slab soffits, beams, raft sides and openings; Sikafloor Curehard-24 dry-shake hardener to 35 m² of power-floated surface; 3 sets of six 150 x 150 x 150 mm test cubes tested by an approved laboratory; saw-cut, isolation and construction joints.
• Reinforcement: 1,61 t high tensile bar of all sizes; 61 m² type 245 fabric.
• Precast concrete pit latrine access panels, 100 mm thick, with concealed keyholes: 2 each at 1 100 x 375 mm, 1 120 x 375 mm, 1 300 x 375 mm and 2 080 x 375 mm.
• Masonry: NFX brick foundations in class 1 mortar; NFP brick superstructure in class II mortar; Corobrick Firelight Satin FBX face brick with 6 mm square recessed joints over 83 m², plus cills, soldier courses and raking cutting; bagging; horizontal reinforcement; prestressed concrete lintels; galvanised hoop iron roof ties.
• Waterproofing: DPC in walls; 250 micron Gunplas sheeting to raft (55 m²) and pit base slab (19 m²); Sikafloor-156 with three coats Sikagard-63 N to internal pit walls (49 m²); two Sika Cemflex coats to external pit walls (35 m²); 3 mm Sikagard 720 EPOCEM to pit slab (18 m²); two coats Brixeal to bagged walls (53 m²); silicon and Sikaflex Pro 2HP joint sealants.
• Roof: Safintra 0,50 mm Widedek AZ150 G550 pre-painted sheeting on 75 x 50 mm SA pine purlins at 1 200 mm centres, 39 m²; ridge capping, cover flashings, pipe flashings and filler blocks; Sisalation 420 foil insulation 39 m²; Sondor eave polycloser.
• Carpentry: Monoplaner prefabricated connector-plate trusses at 1 600 mm maximum centres, 25° pitch, 5 no. at 5 100 mm span with 450 mm overhangs; wall plates, bracing and purlins; TR1 and TR2 certification of all trusses required; fibre cement barge boards and fascias; SABS 545 solid core doors (4), TDM hardwood doors (2) and meranti half doors (4) with timber frames.
• Ironmongery: brass butt hinges, Union lever locks, facility indicator bolts, stainless steel grab rails and flush valve back rail, lockable toilet roll holders, hat and coat hooks, door stops, door signage and paraplegic/female signage.
• Metalwork: hot dip galvanised steel windows (4 no. 533 x 654 mm; 1 no. 899 x 457 mm) with matching burglar bars; pressed steel door frames; galvanised steel posts, channels and 2 no. galvanised single gates.
• Plastering: 30 mm screeds to floors (18 m²) and pit base slab (19 m²); cement plaster to internal walls (84 m²) and pit walls (44 m²).
• Plumbing and drainage: uPVC rainwater goods (12 m half-round gutter, 14 m of 80 mm downpipe); 4 Atlas VIP toilets and 3 Atlas Viking handwash basins; rubber deep-seal traps; brass pillar taps and stopcocks; uPVC soil, waste and vent pipes with fittings; copper water supply.

• Pricing: bill of quantities with a rate and amount entered against every measured item; unpriced items are at the bidder's risk.
• Payment for the toilet demolition is withheld until a desludging certificate is submitted.
• Old materials from the alterations accrue to the contractor, who must allow credit for them in the Final Summary.
• Materials handed over to the department must be receipted; without a receipt the contractor remains liable for their full replacement value, deducted from monies due.

• CIDB: Grade 5GB or higher.
• TR1 and TR2 certification required for all roof trusses.
• Concrete test cubes must be made, stored and tested by an independent firm or institution nominated by the contractor and approved by the architect, with reports submitted to the architect.
• Masonry units must comply with SABS 1215 and SABS 0145; samples of at least 6 units of each masonry unit must be submitted.
• Soil poisoning, compaction and density testing to the specified Mod AASHTO standards.