Roof waterproofing (750 m²) – derbigum torch-on membrane, the playhouse company, durban

Compulsory clarification meeting: 04 November 2026 at 10:00, at 29 Acutt Street.

Closing date and time: 11 November 2026 at 11:00.

Contact: Siya Manqele

Email: [email protected]

Telephone: +27313699507

Address for clarification meeting: 29 Acutt Street.

Submission method: not stated; tenders must be submitted on the official tender documentation issued and delivered per the Tender Data.

Returnable forms: not stated in the source document.

No scoring split or preference point system stated.

Minimum requirement: bidders must hold a CIDB contractor grading of 1SN or higher.

Attendance at the compulsory clarification meeting is required.

Scope of work: strip and dispose of the failed roof waterproofing over 750 m² of roof slab, correct falls and outlets, and apply a Derbigum 4 mm torch-on membrane finished with two coats of silver (aluminium) reflective paint.

CIDB grading: 1SN or higher is required.

Bid documents: download from the eTender portal (search by 'Organ of State') or request via email to [email protected].

Returnable documents (all must be completed, signed and submitted):

• Signed Form of Offer and Acceptance, with a resolution or power of attorney authorising the signatory.
• Fully priced BOQ: every item rated, no items altered, deleted or qualified; 10% contingency and 15% VAT unchanged.
• Active CIDB grading report (Grade 1 or 2SN or higher) valid at closing.
• ICCASA accreditation certificate and latest audit report (SANS 1393 construction management system).
• CSD report showing registration (MAAA number).
• SARS tax compliance PIN, verifiable on CSD.
• SBD 1, SBD 4 (declaration of interest) and SBD 6.1 (preference points) completed and signed.
• Attendance register or certificate for the compulsory site meeting.
• COIDA letter of good standing, valid at closing.
• The OHS file is required only from the successful bidder, not at bid stage.

Disqualification risks:

• Any mandatory item missing, unsigned or invalid.
• BOQ altered, deleted or qualified, or contingency/VAT changed.
• Bidder on the National Treasury Restricted Suppliers or Tender Defaulters register.

Evaluation in three stages; only bids passing a stage proceed:

Stage 1: Administrative compliance (pass/fail) — failure of any mandatory item makes the bid non-responsive and not scored.

Stage 2: Functionality (100 points, minimum threshold 70). Each panel member scores 0–5 per criterion; criterion points = average score ÷ 5 × weight.

• Relevant experience: 25 points
• Method statement and programme: 25 points
• Key personnel: 15 points
• Health, safety and fire approach: 15 points
• Manufacturer approval and guarantee: 10 points
• Quality management and handover: 10 points

Stage 3: Price and specific goals on 80/20 basis (price 80%, specific goals 20%).

Specific scoring notes:

• Relevant experience: 5 = three or more projects of 500 m2+ in last 5 years, at least one with Derbigum (or equivalent 4 mm APP/SBS) on an occupied public/commercial building; 4 = three projects of 500 m2+; 3 = two projects of 500 m2+ or three of 250–499 m2; 2 = one project of 500 m2+; 1 = only projects under 250 m2; 0 = no verifiable references. Each reference needs a letter with client, contact, area, value and completion date.
• Method statement and programme: site-specific sequence and Gantt programme; higher scores for phasing to avoid leaving stripped areas unprotected, scheduling noisy work around performances, completing pre-strip inspections and surveys, screed to min. 1:100 fall, moisture testing, membrane laid from outlets upwards with 100 mm/150 mm laps, handling of water tank and pump, all five hold points and 48-hour flood test in programme, realistic duration with matched resources.
• Key personnel: certified qualifications for contracts manager (5+ years on waterproofing/roofing), site supervisor (Derbigum-trained, 3+ years supervising torch-on, full-time on site), construction H&S officer (SACPCMP-registered, part-time acceptable).
• Health, safety and fire approach: short site-specific outline covering work at height, hot-work permits, fire watch, 2×9 kg DCP per face, 1-hour rule, waste lowering, public protection, gas cylinder storage and load-spreading.
• Manufacturer approval and guarantee: current Derbigum approval plus a Derbigum letter confirming a 10-year joint guarantee and that the specified primer and paint will not void it. 3 = current approval with written guarantee commitment but no Derbigum letter; 0 = guarantee by applicator alone or under 10 years.
• Quality management and handover: certified SANS 1393 construction management system or ISO 9001.

Scope: strip and dispose of failed roof waterproofing over 750 m2 of roof slab at The Playhouse Company head office, correct falls and outlets, apply Derbigum 4 mm torch-on membrane finished with two coats of silver reflective paint.

Site: The Playhouse Company Head Office Building, 29 Acutt Street, Durban.

Key work items:

• Establish site; store materials safely on roof (load-spread, wind-secured); remove on completion.
• Submit OHS file under OHS Act and Construction Regulations 2014 (risk assessment, fall protection plan, method statement, competent persons) — only for successful bidder.
• Torch-on work under daily hot-work permit, with fire watch and 2×9 kg DCP extinguishers at each work face; no torching near timber, plant, or within 1 hour of leaving site.
• Use certified access only (SANS-compliant ladders, scaffold or guardrails). Fixed roof-access ladder pulling away from wall must not be used until repaired.
• Clear roof of loose debris, redundant items, sand and vegetation before work starts and keep clear daily.
• Work in phases so no stripped area left unprotected overnight or before rain; programme noisy work around theatre performances and rehearsals.

Inspection and leak investigation:

• Joint inspection with Playhouse maintenance manager before stripping; photograph and record all defects.
• Survey existing falls; mark ponding areas (min. 1:100 fall required).
• Rod, flush and clear all roof outlets and downpipes; report blockages, cracks, leaking joints, including downpipes linked to basement ingress.
• Trace leak paths to 8th floor (under water tank); report slab cracks or micropores.

Removal and disposal:

• Strip all existing membranes, coatings, paint down to screed or concrete slab, including upstands, skirtings, around penetrations.
• Remove existing flashings, cover flashings, sealants, loose or debonded screed.
• Dispose of all waste at licensed landfill; provide disposal certificates. No waste thrown from roof — lower in chutes or bags.
• Strip only what can be re-covered or temporarily protected the same day.

Substrate preparation:

• Hack off defective screed; lay new sand-cement screed (min. 25 mm, bonded with slurry bonding agent) to min. 1:100 fall to outlets.
• Repair slab cracks (cut out, prime, fill with polyurethane sealant or epoxy) and spalled/honeycombed concrete with structural repair mortar.
• Form 50×50 mm sand-cement cove fillets at all upstands, walls and plinths.
• Grind high spots, high-pressure clean, dry to manufacturer's moisture content.

Stormwater outlets and downpipes:

• Clear and repair existing outlets; replace damaged bodies with new 100 mm outlets with torch-on compatible flanges.
• Repair or replace leaking downpipe sections and brackets.

Waterproofing system (Derbigum torch-on):

• Primer: one coat of solvent-based bituminous primer approved by membrane manufacturer, over all surfaces; allow to dry.
• Membrane: Derbigum SP4 (4 mm modified-bitumen, polyester-reinforced), fully bonded, laid from outlets upwards so laps shed water.
• Laps: min. 100 mm side, 150 mm end, staggered; every lap torched until continuous bitumen bead shows.
• Upstands: membrane turned up min. 150 mm above finished roof level (or under copings/chases), over cove fillets, with 300 mm girth reinforcing strip at angle.
• Outlets: 1 m×1 m reinforcing layer at each outlet, membrane dressed into throat and clamped.
• Puddle-free finish: no ponding deeper than 5 mm 48 hours after rain.

Silver reflective paint:

• After curing/weathering period set by Derbigum, clean membrane of dust and oil.
• Apply two coats of solvent-based aluminium (silver) reflective roof paint, compatible with bituminous membranes and Derbigum-approved so guarantee not voided.
• Apply to all horizontal membrane, upstands and flashings at manufacturer's coverage rate; second coat at right angles to first.
• Do not apply in rain, on wet surfaces, or above 35°C surface temperature.

Flashings and sealing:

• New 0.6 mm aluminium or pre-painted Chromadek cover flashings to all upstands, fixed into 20 mm chase with stainless steel fixings at max. 300 mm centres.
• Seal top of flashings with UV-stable polyurethane sealant over backer rod.

Testing and inspection:

• Five hold points for inspection by Playhouse representative: after stripping, after screed and falls, after priming, after membrane, after silver paint.
• Flood test each completed section with 50 mm water for 48 hours (or 2-hour hose test where structure doesn't allow); check ceilings below for leaks.
• Repair any failure and retest at contractor's cost.

Guarantee and handover:

• Minimum 10-year joint manufacturer and applicator guarantee.
• Hand over guarantee certificate, as-built roof plan showing outlets and falls, product data sheets, waste disposal certificates, test records.
• Leave roof clean, free of offcuts, gas cylinders and debris.
• Joint inspection after first heavy rains and at 12 months; defects made good.

Evaluation methodology (Stage 2) requires a site-specific sequence and Gantt programme. Higher scores for: phasing so no stripped area is left unprotected overnight or before rain; noisy work planned around performances and rehearsals; joint inspection, falls survey, outlet rodding and leak trace to 8th floor done before stripping; screed to min. 1:100 fall; moisture testing before priming; membrane laid from outlets upwards with 100 mm/150 mm laps; handling of water tank and pump during membrane work; all five hold points and 48-hour flood test in programme; realistic duration with matched resources.

Relevant experience (25 points): completed torch-on roof waterproofing projects in the last 5 years, each with reference letter giving client, contact, area, value and completion date. Scoring: 5 = three or more projects of 500 m2+, at least one with Derbigum (or equivalent 4 mm APP/SBS) on occupied public/commercial building; 4 = three projects of 500 m2+; 3 = two projects of 500 m2+ or three of 250–499 m2; 2 = one project of 500 m2+; 1 = only projects under 250 m2; 0 = no verifiable references.

Key personnel (15 points): CVs with certified qualifications for contracts manager (5+ years on waterproofing or roofing contracts), site supervisor (Derbigum-trained, 3+ years supervising torch-on work, full-time on site), construction H&S officer (SACPCMP-registered, part-time acceptable).

Five inspection hold points with the Playhouse representative: after stripping, after screed and falls, after priming, after membrane, after silver paint. Flood test each completed section with 50 mm water for 48 hours where structure allows, otherwise 2-hour hose test; check ceilings below. Repair failures and retest at contractor's cost. Joint inspection after first heavy rains and again at 12 months. A certified SANS 1393 construction management system or ISO 9001 is required for evaluation (10 points under functionality).

Priced Bill of Quantities required, with every item rated. BOQ sections: 1) Preliminaries (lump sums: site establishment, OHS file, H&S officer); 2) Removal and disposal (750 m2 horizontal, 110 m upstands, 110 m flashings, 750 m2 disposal); 3) Substrate preparation (750 m2 provisional screed repairs, 50 m crack sealing, 10 m2 concrete repair, 110 m cove fillets, 750 m2 cleaning); 4) Stormwater (6 outlets, provisional replacements and downpipe work); 5) Derbigum membrane (750 m2 + 110 m upstands, primer); 6) Silver paint (750 m2 + 110 m upstands); 7) Flashings and sealing (110 m each); 8) Testing (750 m2 flood test, lump sum hold points); 9) Guarantee (lump sum). 10% contingency on subtotal and 15% VAT must be included; no alterations, deletions or qualifications allowed. Measurement basis: roof area 750 m2, upstand length 110 m, outlets 6 (provisional).

Pricing format: priced Bill of Quantities (BOQ), every item rated. The 10% contingency on subtotal and 15% VAT must remain unchanged. Summary totals are calculated from the BOQ.

Measurement basis:

• Roof area: 750 m2
• Upstand/parapet length: 110 m (assumed perimeter of a square roof of this area)
• Existing roof outlets: 6 (provisional)

BOQ sections:

1. Preliminaries, safety and access (site establishment, OHS file, part-time H&S officer) — lump sum
2. Removal and disposal of old waterproofing — 750 m2 strip, 110 m upstands, 110 m flashings, 750 m2 disposal
3. Substrate preparation and screed to falls — provisional: 750 m2 hack screed, 750 m2 new screed, 50 m crack sealing, 10 m2 concrete repair, 110 m cove fillets, 750 m2 cleaning
4. Stormwater outlets and downpipes — clear 6 outlets, provisional: replace 6 outlet bodies, redirect 30 m downpipe, repair 20 m downpipe
5. Waterproofing system — primer 750 m2 + 110 m upstands, membrane 750 m2 + 110 m upstands
6. Silver reflective paint — 750 m2 horizontal + 110 m upstands/flashings
7. Flashings and sealing — 110 m cover flashing, 110 m sealant
8. Testing and inspection — flood test 750 m2, attendance at five hold points (lump sum)
9. Guarantee and handover — 10-year joint guarantee (lump sum)

No bid security, bonds, guarantees, retention or payment terms stated in the document.

Mandatory compliance (Stage 1, pass/fail) — evidence required:

• CIDB grading: Grade 1 or 2SN or higher, with active CRS printout at closing.
• Construction management system: ICCASA accreditation (SANS 1393) certificate and latest audit report.
• CSD registration, with CSD report showing MAAA number.
• Tax compliance: SARS tax compliance PIN, verified on CSD.
• Not on National Treasury Restricted Suppliers or Tender Defaulters register.
• COIDA letter of good standing, valid at closing.
• Compulsory site meeting attendance (attendance register or certificate).

Standard forms required: SBD 1 (offer), SBD 4 (declaration of interest), SBD 6.1 (preference points).

B-BBEE: document mentions preference points under SBD 6.1 and 80/20 price/specific goals evaluation, but no specific B-BBEE level or thresholds are stated.

OHS file required under OHS Act and Construction Regulations 2014 (risk assessment, fall protection plan, method statement, competent persons) — only for successful bidder. Torch-on work under daily hot-work permit, fire watch, 2×9 kg DCP extinguishers per work face; no torching near timber/plant or within 1 hour of leaving site. Use certified access only (SANS-compliant ladders, scaffold, guardrails); damaged fixed roof ladder must not be used until repaired. Lower waste by chute or bags; protect public at street level during hoisting and skip exchanges. Gas cylinder storage and load-spreading on roof. Part-time health and safety officer to be appointed and included in pricing.

All stripped waterproofing and waste must be loaded, carted away and disposed of at a licensed landfill site, with disposal certificates provided. No waste may be thrown from the roof; lower in chutes or bags.

Minimum 10-year joint manufacturer and applicator guarantee on the waterproofing system, with a guarantee certificate handed over. Handover also requires as-built roof plan, product data sheets, waste disposal certificates and test records. Joint inspection after first heavy rains and at 12 months, with defects made good. The specified silver paint and primer must be Derbigum-approved so the guarantee is not voided.

Evaluation in three stages: Stage 1 pass/fail compliance (mandatory items listed under submission guidelines), Stage 2 functionality with threshold 70/100, Stage 3 price and specific goals on 80/20 basis. Functionality criteria and weights: relevant experience 25, method statement and programme 25, key personnel 15, health safety and fire approach 15, manufacturer approval and guarantee 10, quality management and handover 10. Scoring scale 0–5 per panel member; criterion points = average ÷ 5 × weight. Only bids passing Stage 1 proceed.