SOW Aries 325 - Roof Recovery Project_ Contractor guide. V1.pdf

CONTRACTOR SIGNATURE___________________________________________________________

US Embassy Statement of Work/ Contractor Guide – GOP Residential Roof Recovery Project

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Embassy of the United States of America Pretoria, South Africa.

STATEMENT of WORK

“CONTRACTOR GUIDE”

Project: Roof Recovery Project

Roof Recovery Project

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“CONTRACTOR GUIDE”

US Embassy – GOP Residential, Roof Recovery Project

325 Aries Street, Waterkloof Ridge, Pretoria, Gauteng, South Africa

1. GENERAL

1.1 Purpose of This Guide

This Contractor Guide accompanies the approved Architectural & Engineering (A&E) Design Package, titled "Aries 325 -

Roof Recovery Project- Roof Design Services_SOW" (the "Design Package"). The Design Package — including all drawings, schedules, sections, notes, and specifications contained therein — constitutes the official Scope of Work (SOW) for this project. This Guide does not replace, summarize, or supersede the Design Package. It is intended to:

• Direct Contractors to the Design Package as the governing technical scope document

• Highlight critical compliance, safety, environmental, and coordination requirements that apply across the project

• Establish proposal submission and administrative requirements

• Flag project-specific conditions requiring special approval sequencing (see Section 4)

Contractors must base all proposals, pricing, and execution planning on the Design Package. Where any ambiguity exists between this Guide and the Design Package, the Design Package governs, except where this Guide imposes an additional or more stringent requirement (e.g., Sections 4.2 and 4.3 below), in which case the more stringent requirement applies.

1.2 Project Description

The U.S. Government requires the recovery/replacement of the roof at 325 Aries Street, Waterkloof Ridge, Pretoria — a two-storey residential property (ERF 365) — in accordance with the Design Package. Work includes, but is not limited to:

• Removal of all existing roof covering

• Removal and replacement of all rafters

• Installation of new 420 x 332mm Marley Double Roman Concrete Roof Tile as the primary new roof covering

• Retention/construction of concrete slab roof sections in specific areas identified in the Design Package (e.g., bathroom), finished with cementitious waterproofing rather than tile

• Reuse and reinstallation of existing solar panels

• Associated waterproofing, insulation, ceiling installation, rainwater drainage systems, plastering/painting, and associated electrical work — all as detailed in the Design Package

• Asbestos survey, and if required, licensed abatement, prior to any demolition or intrusive work (see Section 4.3)

Refer to the Design Package for all technical scope, materials, dimensions, and specifications, including but not limited to:

• Site/zoning/coverage data

• Roof plan, slopes, tile schedule, and rainwater drainage layout

• Roof section, rafter specifications, insulation and ceiling assembly

• Floor plan and room layout (including concrete slab roof areas)

• Electrical legend and fixture layout

1.3 Proposal Requirements

Proposals shall include:

• Comprehensive project plan and timeline referencing each drawing/section of the Design Package (see Section 9)

• Detailed response to all tasks listed in Section 6 of this Guide

• Material specifications for rafters, Marley Double Roman concrete roof tiles (or approved equivalent), underlay/battens, wall plates, purlins, flashing, insulation, ceiling boards, plaster, paint, and finishes, cross-referenced to the Design Package and applicable SANS standards

• Itemized cost breakdown separating labour and materials per task (see Section 5.2 for format guidance)

• Detailed lump sum fee for services

• Project-specific safety plan addressing fall hazards, working at heights, structural demolition/bracing risk, and ACBM risk (see Sections 4.2 and 4.3)

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• A separate, sealed submission for the temporary bracing/shoring system (structural and architectural design), prepared and stamped by a competent, registered professional engineer/architect, for OBO review and approval (see

Section 4.2)

• A separate submission for the rafter/roof structure design, prepared by a Competent Person per SANS

10243/1900, for OBO/Engineer approval prior to commencing work (see Section 6, Task 5)

• Proof of asbestos survey firm accreditation and, if applicable, licensed asbestos abatement contractor credentials (see

Section 4.3)

• Roof tile manufacturer's (Marley or approved equivalent) installation guidelines and warranty terms

• Electrical contractor credentials and proof of certification

• Waterproofing contractor's certificate of competency for the concrete slab sections, and confirmation of ability to provide a 10-year insurance-backed guarantee (see Section 6, Task 7)

1.4 Site Access and Security Requirements

All Contractor personnel must complete security vetting prior to site access. The vetting process requires:

• Submission of identification document copies to the Point of Contact (P.O.C.)

• P.O.C. submission to the security office for temporary clearance approval

• Access clearances valid only for dates and times coordinated with the P.O.C.

• Documentation of all service dates on access control sheets

• Presentation of original (not certified copies) identification documents at each site visit for verification

2. DEFINITIONS

• Owner: The U.S. Embassy/OBO, Pretoria

• P.O.C. (Point of Contact): Etienne Smit

• Contractor: The awarded vendor

• COR: Contracting Officer's Representative

• POSHO: Post Occupational Safety and Health Officer

• Competent Person: An individual qualified by training, knowledge, and experience to design, certify, or inspect the specific structural or technical element in question (e.g., roof trusses/rafters per SANS 10243/1900)

• Design Package: The approved A&E drawing set governing the technical scope of this project

• Bracing/Shoring System: Temporary structural support installed to stabilize walls during roof removal and reconstruction, as required under Section 4.2 of this Guide

• Marley Double Roman Tile: A 420 x 332mm concrete roof tile profile, as specified in the Design Package

• ACBM: Asbestos Containing Building Material

3. SITE FAMILIARIZATION

A site visit will be conducted prior to proposal submission. The Contractor shall demonstrate thorough familiarity with the

Design Package, existing roof covering and rafter/structure conditions, the location and extent of concrete slab roof sections, potential ACBM locations (e.g., fibre-cement fascias, barge boards, ceiling boards), and all factors that may affect project execution, including the condition of walls that will require temporary bracing during roof removal. The Contractor shall notify the P.O.C. in writing of any additional information required or any discrepancy identified between the Design Package and as-built site conditions.

4. SUGGESTED MODIFICATIONS & SPECIAL APPROVAL

REQUIREMENTS

4.1 Suggested Modifications

The Contractor may propose modifications to the scope that would improve project outcomes (e.g., alternative tile fixing methods, rafter spans, battens). All suggestions will be reviewed for acceptance by OBO/the U.S.G. Point of Contact and must not proceed without written approval.

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4.2 Temporary Bracing/Shoring System — Mandatory Pre-Approval Per the Design Package's General Notes: "Where replacing roof structures, and/or demolishing beams and trusses, all walls must be shored" (temporary structural supports must be installed to stabilize the walls during the roof replacement process). In addition to that general note, the following requirement applies and takes precedence:

The temporary bracing/shoring system used to support walls during roof removal must be both structurally and architecturally designed by a competent, registered professional engineer and/or architect. The complete bracing/shoring design — including layout, connection details, and sequencing — must be submitted to and formally approved by OBO before the Contractor commences any roof removal work. Roof removal shall not begin under any circumstances until written OBO approval of the bracing/shoring design has been issued to the Contractor.

This requirement is separate from, and in addition to, the rafter/roof structure design and certification requirements noted in

Section 6, Task 5.

4.3 Asbestos Containing Building Materials (ACBM) — Mandatory Survey and Controls General Requirement: All works involving Asbestos Containing Building Materials shall be carried out in strict compliance with applicable United States and South African health, safety, and environmental regulations, including identification, handling, removal, encapsulation, transportation, and disposal. No disturbance of suspected or confirmed ACBM shall occur without proper assessment, authorization, and implementation of approved control measures.

Regulatory Compliance — United States Standards:

• U.S. Army Corps of Engineers Safety and Health Requirements Manual (EM 385-1-1) — mandatory for construction, major renovation, and alteration projects; includes requirements for hazardous materials, including asbestos

• Overseas Buildings Operations (OBO) Design Standards & Building Code — incorporates U.S. model codes for hazardous materials handling

• United States Occupational Safety and Health Administration (OSHA) requirements

Regulatory Compliance — South African Standards:

• Hazardous Chemical Agents Regulations, 2021 — governs exposure limits, risk assessments, control of hazardous substances, occupational exposure monitoring, control measures, and worker training/medical surveillance

• Asbestos Abatement Regulations, 2020 — requires approved asbestos inventory and risk assessment, use of licensed asbestos contractors, controlled removal methods and documentation, and air clearance certification post-removal

• Health and Safety Guidance 248: Asbestos — technical guidance on safe handling/removal, enclosure/encapsulation/disposal, and best practice methodologies

• SANS 10228 and SANS 10229 — packaging, transportation, and disposal of asbestos and hazardous waste material

Mandatory Sequencing (this section constitutes a hard gate, alongside Section 4.2):

1. A certified asbestos survey shall be conducted before any demolition or intrusive work begins (including before roof covering removal). All ACBM locations and extent shall be documented.

2. Abatement and management strategies shall be specified and documented based on survey findings.

3. If ACBM is confirmed, construction/removal shall be carried out by a licensed asbestos contractor meeting all relevant compliance requirements.

4. The U.S.G. Point of Contact/COR must participate in planning and monitor implementation to ensure compliance with all safety and health standards.

5. No contractor shall disturb ACBM without: approved method statements, completed risk assessments, and valid licensing (where required).

Contractor Note: The Contractor's proposal and schedule must account for asbestos survey lead time as a precondition to roof covering removal, in the same manner as bracing/shoring design approval (Section 4.2). These two approval gates may run in parallel but both must be cleared, in writing by OBO/P.O.C., before demolition begins.

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5. PROPOSAL SUBMISSION REQUIREMENTS

5.1 Required Documentation

• Company profile (if new to U.S. Government projects), including evidence of similar completed roofing/structural projects

• Detailed response to all tasks listed in Section 6

• Project timeline and work plan, explicitly showing the asbestos survey and bracing/shoring approval gates prior to demolition (see Section 9)

• Material specifications (rafters, Marley Double Roman tiles, wall plates, purlins/battens, underlay, flashing, insulation, ceiling boards, plaster, paint) referenced to Design Package pages and applicable SANS standards

• Sealed bracing/shoring design submission (per Section 4.2), for OBO approval prior to award or prior to notice to proceed with demolition, as directed by the P.O.C.

• Sealed rafter/roof structure design submission by a Competent Person (per Section 6, Task 5), for OBO/Engineer approval prior to fabrication/erection

• Proof of accredited asbestos survey provider, and licensed asbestos abatement contractor credentials if applicable

• Cost breakdown separating labour and materials per task

• Project-specific safety plan, including ACBM risk controls

• Proof of electrical contractor certification and qualifications

• Proof of insurance for all employees

5.2 Pricing Requirements

CONTRACTOR/COMPANY: ________________________________________

CRITICAL NOTICE:

• The Contractor must verify all measurements and existing conditions on-site prior to quotation submission, per the

Design Package's General Notes ("Field verify existing construction and dimensions prior to fabrication and installation of any item"). No cost adjustments will be approved due to measurement errors.

• Separated costing between material and labour is required for each task.

• Pricing must include the cost of the bracing/shoring design (professional fees) and its physical installation.

• Pricing must include the certified asbestos survey and, as a provisional sum, an allowance for licensed abatement should ACBM be confirmed.

• Pricing must distinguish between the tiled roof sections and the concrete slab roof sections, as these require different trades/materials.

Note on Format: The table below is provided as an indication only of the level of cost breakdown and task separation required. The Vendor is not required to use this exact table and may build and submit its own costing format, provided that it clearly reflects, at minimum:

• A separate line item for each major task/trade area listed below

• Labour and material costs separated for each line item

• Any provisional sums (e.g., asbestos abatement) clearly identified as such

• A subtotal, VAT (if applicable), and total amount quoted

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TASK DESCRIPTION COST

LABOUR

COST

MATERIAL

TASK 1 General – Project Management & Safety R R

TASK 2 Asbestos Survey & Abatement (Provisional Sum, if required)

R R

TASK 3 Bracing/Shoring Design & OBO Approval R R

TASK 4 Existing Roof Covering Removal R R

TASK 5 Rafter Removal and Replacement (incl. Wall

Plates, Purlins/Battens)

R R

TASK 6 Marley Double Roman Tile Roof Covering

Installation

R R

TASK 7 Concrete Slab Roof Sections & Waterproofing R R

TASK 8 Insulation and Ceiling Installation/Finishing R R

TASK 9 Plastering and Painting R R

TASK 10 Electrical Work and COC R R

TASK 11 Rainwater Drainage Installation R R

TASK 12 Solar Panel Removal, Storage & Reinstallation R R

TASK 13 Debris Disposal R R

Sub Total

R R

VAT (if applicable)

R R

TOTAL AMOUNT

QUOTED

R

Contractor Concerns and Notes: Please feel free to add any additional information and concerns together with the proposal submission package.

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6. TECHNICAL REQUIREMENTS AND SPECIFICATIONS

(All technical execution shall conform to the Design Package and cited SANS standards. This section lists sequencing, standards references, and administrative obligations only.)

TASK 1: General – Project Management and Safety The Contractor shall:

• Submit a detailed project schedule for P.O.C. approval prior to commencing work, explicitly showing the asbestos survey and bracing/shoring approval as sequencing gates

• Provide material samples (including a physical sample of the Marley Double Roman tile — color/finish — for approval) before any procurement commences

• Develop and submit a project-specific safety plan addressing fall protection, working at heights, structural demolition hazards, and ACBM controls

• Conduct a mandatory pre-construction safety meeting with all site personnel

• Conduct daily safety briefings throughout the project

• Coordinate all work with the P.O.C., particularly the asbestos survey, bracing/shoring approval sequencing, and electrical disconnection/reconnection

• Maintain a clean and organized work environment; perform daily site cleanup

• Confirm with P.O.C. before removing any materials from site

• Minimize disruption to occupants and movement on-site

• The Contractor is liable for repair or replacement of any damaged fixtures, fittings, walls, or finishes caused during works

• Installation/Workmanship Warranty: 12 months from date of final acceptance, covering rafter structure, tile roof covering, concrete slab roof sections, waterproofing, ceilings, plastering/painting, and all electrical work (note: this is separate from and does not limit the 10-year waterproofing manufacturer's guarantee required under Task 7)

TASK 2: Asbestos Survey and Abatement (Mandatory — Precedes All Demolition)

1. Survey:

o Engage an accredited firm to conduct a certified asbestos survey of all roof, ceiling, fascia, barge board, and cladding areas affected by the works, before any demolition or intrusive work begins o Document the location and extent of all identified or suspected ACBM

2. Assessment and Approval:

o Develop abatement and management strategies based on survey findings and submit to P.O.C./COR for review o No demolition of any area containing suspected or confirmed ACBM shall proceed without approved method statements, risk assessments, and valid contractor licensing (where required)

3. Abatement (if required):

o Engage a licensed asbestos abatement contractor compliant with the Asbestos Abatement Regulations, 2020, to carry out removal o Package, transport, and dispose of asbestos and hazardous waste per SANS 10228 and SANS 10229 o Obtain air clearance certification post-removal before proceeding with demolition in the affected area o P.O.C./COR shall participate in planning and monitor implementation throughout

TASK 3: Bracing/Shoring Design and OBO Approval (Mandatory — Precedes Roof Removal)

1. Design Development:

o Engage a competent, registered professional engineer and/or architect to design a temporary wall bracing/shoring system for all walls affected by roof removal o Design must address structural stability for the full duration of roof removal and reconstruction, including anticipated wind and construction loading o Design must include layout drawings, connection details, and installation/removal sequencing

2. Submission and Approval:

o Submit sealed design documents to OBO/P.O.C. for formal review and written approval o No roof removal activity may commence until OBO has issued written approval of the bracing/shoring design (and, per Task 2, until any required asbestos clearance has been obtained) o Any field changes to the approved bracing/shoring design require re-approval by OBO before implementation

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3. Installation:

o Install the bracing/shoring system strictly per the approved design o Have the installed system inspected and confirmed by the design engineer/architect (or Embassy technician, as directed by P.O.C.) before roof removal begins o Maintain the bracing/shoring system in place and in good condition until the new rafter and roof covering structure is sufficiently complete to permit safe removal, as confirmed by the design engineer

TASK 4: Existing Roof Covering Removal

1. Pre-Removal Requirements:

o Confirm asbestos clearance (Task 2) and bracing/shoring system installation, inspection, and approval (Task

3) before removal begins o Coordinate with a qualified electrical contractor for safe disconnection of fixtures affected by roof removal o Document existing conditions photographically before removal o Carefully remove and safely store existing solar panels designated for reuse per the Design Package

2. Removal Procedures:

o Remove all existing roof covering material systematically across all applicable areas, minimizing damage to walls and remaining structure o Identify and confirm the boundaries between tiled roof sections and concrete slab roof sections per the Design

Package before removal o Report any structural deficiencies or as-built discrepancies to the P.O.C. immediately before proceeding

TASK 5: Rafter Removal and Replacement (Timber Roof System)

1. Removal:

o Remove all existing rafters across the applicable roof areas, in coordination with the approved bracing/shoring sequence o Inspect wall plates and supporting structure for damage or deterioration; report findings to P.O.C.

2. Design Requirements (Mandatory Pre-Approval):

o The roof structure (rafters, and associated timber roof system components) must be designed by a Competent

Person in accordance with SANS 10243:2004 (Design, Manufacture and Erection of Timber Trusses) and, where prefabricated trusses are used, SANS 1900:2004 (Monoplanar prefabricated timber roof trusses) o Design information to be submitted for approval before any work starts must include, as applicable: span, pitch, and overhangs; points of support and roof loading; ceiling material; constraints on batten/purlin/truss centres; special bracing required; positions/mass/dimensions of water tanks, geysers, ducts, hatches, chimneys; truss/rafter configuration; preservative treatment (per SANS 10005); grade/species of timber; type of timber connections; and quality verification method as agreed between parties o The design submission must show, at minimum: sizes and grades of all timber components; sizes of trusses/rafters; nail plate sizes and positions (if applicable); special connections (hips, valleys, jack rafters);

sizes and spacing of purlins/battens; type of roof covering and design loads; point loads and supports (e.g., geysers); and bracing o No fabrication or erection shall begin until this design and accompanying guarantee/quality documentation has been submitted and approved by OBO/Engineer

3. Materials and Installation:

o Rafter timber must be treated structural timber (minimum H2 class) compliant with SANS standards for resistance to wood borer and termite activity, executed in line with ITC certification requirements o Structural timber must comply with SANS 1783 (stress-graded sawn softwood) or SANS 1460 (structural laminated timber), as applicable, with correct stress grade marking on each piece o Wall plates: sawn softwood structural timber, grade S5, size 114 x 38mm (or as specified), laid in long lengths on the inner leaf of load-bearing walls and strapped down until rafters are in place o Purlins: sawn structural softwood, grade S5, size 50 x 76mm (or as specified); Battens: sawn structural softwood to size as specified o Purlins and battens to be nailed in long lengths with staggered joints, splayed and occurring on rafter centres, using correctly sized galvanized wire nails per the specification o Battens on both sides of valleys to be installed so the first row of tiles lies at the same angle as following rows o Fasteners to comply with SANS 1700 (general), SANS 820 (steel nails), SANS 1900 (nail plates);

hangers/hurricane clips to be zinc-coated to SANS 1477 class Z275

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4. Certification:

o Upon completion, the Contractor must supply a Certificate of Approval of the roof structure, signed by the

Competent Person who designed it, confirming the whole roof structure has been fabricated and erected in accordance with SANS 10243 (or SANS 1900, if prefabricated trusses are used) o All rafter/roof structure work is subject to Engineer's and P.O.C. approval before proceeding to tile installation

TASK 6: Marley Double Roman Tile Roof Covering Installation

1. Material Requirements:

o Supply and install new 420 x 332mm Marley Double Roman Concrete Roof Tile (or OBO-approved equivalent) per the Design Package specification, including color/finish as specified or approved o Install appropriate battens, counter-battens, and an under-roof-tile membrane (0,25mm white polyolefin membrane complying with SANS 952 type E, grade 1, or 3-ply polypropylene laminate per Agrément

Certificate 2004/304, as specified) per manufacturer's specifications and SANS 10237 Edition 2 o Lay the under-tile membrane horizontally over rafters prior to battening, with a sag of approximately 40mm, minimum overlaps of 150mm, fixed with clout nails to rafter centres; terminate ±25mm beyond external walls and fold down against gable walls; lay a 600mm strip under the main membrane at valleys, and over the main membrane at hips and ridges

2. Installation Standards:

o Install tiles per manufacturer's fixing, lapping, and nailing/clipping requirements, accounting for wind-uplift/exposure conditions specific to the site o Ensure correct fall/pitch alignment consistent with the Design Package roof plan (slopes as indicated, e.g. 26° sections) o Install ridge tiles, hip tiles, valley flashing, and barge/verge details as required for a fully weathertight installation o Coordinate penetrations (e.g., solar panel mounts, vents, rainwater outlets) with tile installation to maintain weatherproofing integrity

3. Quality Control:

o Conduct a visual and functional inspection for leaks, cracked/misaligned tiles, and fixing deficiencies prior to final acceptance o Correct any deficiencies before proceeding to ceiling/finishing work

TASK 7: Concrete Slab Roof Sections & Waterproofing

1. Concrete Work:

o Construct/repair the reinforced concrete roof slab in the specific sections identified in the Design Package

(e.g., bathroom area) per Engineer's design and specifications, including screed laid to falls o Concrete, formwork, and reinforcement to comply with SANS 1200G (Concrete – structural) and SANS

10100 (Structural Use of Concrete) o Cement to comply with SANS 50197-1 (strength class 32,5N or higher), SABS-mark bearing; aggregates to comply with SANS 1083; reinforcement (steel bars) to comply with SANS 920, welded steel fabric to comply with SANS 1024, cut/bent per ARP 040 o Mix design proof to be provided by a Competent Person; consistency measured per SANS Method 5862

(slump test)

2. Masonry (if required for bracing bearing points, parapet repairs, etc.):

o Clay bricks to comply with SANS 227 (class and grade as specified); compressive strength to comply with

SANS 10400-K minimum requirements (3(5) MPa single storey/cladding/internal walls; 7(10) MPa double storey structural/free-standing/retaining walls) o Mortar cement to comply with SANS 50197/50413; sand to comply with SANS 1090

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3. Waterproofing:

o Apply new cementitious waterproofing layer (or other specified system: polymer modified bitumen, reinforced liquid acrylic/styrene-acrylic, polyolefin sheet, or synthetic/plastomeric membrane) per manufacturer's specifications and SANS 10021 o Substrate preparation must comply with SANS 10021 minimum requirements: screeds minimum 40mm thick, laid to minimum fall of 1:70; fillets/coves/chamfers at horizontal-vertical junctions; screed cracks up to

0,3mm acceptable; moisture content below 7%; outlets minimum 75mm diameter, non-plastic o Damp-proof courses/membranes (where applicable) to comply with SANS 952 (type B for DPC, type C for

DPM), installed per specification

4. Quality Control:

o Provide manufacturer's certificate of competency and a QA/QC programme prior to award of the waterproofing work o Organize a pre-installation meeting with the manufacturer, architect/principal agent, and waterproofing contractor o Conduct required testing before applying any protection layer: a flood test of 48 hours, or a spark/vacuum/air pressure test (horizontal surfaces); spark or vacuum test (vertical surfaces) o Provide a certificate confirming the waterproofing was handed over in a watertight and workmanlike condition o Apply the specified protection layer (e.g., bituminous aluminium paint, UV-block coating, or geocomposite drainage layer with stone/tile ballast, as specified)

5. Guarantee (Mandatory):

o Provide an insurance-backed guarantee from the manufacturer for the waterproofed area — including flashings, skirtings, outlets, expansion joints, and other details — for a minimum of 10 years on general surfaces and 5 years on retaining walls and plant boxes o Any finish installed over the waterproofing that must be removed due to leaks shall be replaced by the guarantor at no charge o Provide full maintenance particulars to the P.O.C. upon completion

TASK 8: Insulation and Ceiling Installation/Finishing

1. Insulation:

o Install insulation per the Design Package specification, using mineral fibre blanket, batts, cellulose loose fill, or reflective foil laminate (class A) complying with SANS 1381 o Fit blankets/batts snugly between rafters/trusses; nail batts where necessary o If reflective foil is used, lay over trusses with tile battens or on galvanized/PVC-coated span wire at recommended centres, with 140mm laps, drawn tight and fixed per manufacturer's instructions

2. Ceiling Boards:

o Use flat, plain fibre-cement ceiling board complying with SANS 803 (4 or 6mm thick as specified), or flat gypsum ceiling board complying with SANS 266 (4 or 6mm thick as specified) o Store board on an even surface, under cover, and dry o Install per manufacturer's instructions; use longest practical lengths, arranged symmetrically about the room at right angles to timber brandering, with cut boards along walls o Lay fibre-cement boards ripple-face down to hide nail heads; nail to brandering with 38mm galvanized clout nails or 32 x 2,5mm galvanized serrated ceiling nails at 150mm centres; insert prepainted H-profile metal cover strips between boards o For plastered gypsum ceiling boards: ensure the building is enclosed before fixing; fix wire scrim or self-adhesive brown paper tape over all joints; plaster the same day the board is erected, finished to a smooth polished surface

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TASK 9: Plastering and Painting

1. Plastering:

o Cement to comply with SANS 50197-1 (strength class 32,5N) or masonry cement to SANS 50413-1 (type

MC 22,5X); bags SABS-mark bearing; use oldest stock first; no lumped cement o Sand to comply with SANS 1090, fineness modulus as specified

2. Painting:

o Emulsion paint on plaster (walls): remove loose paint, ensure plaster fully dry, prime cracks with SANS

1586 grade 2 emulsion; apply one coat thinned 10% or two full coats per SANS 1586 grade/gloss as specified, or two coats emulsion-base textured coating per SANS 1227 o Plastered ceilings: two coats emulsion paint per SANS 1586 grade/gloss as specified o Fibre-cement fascias/barge boards/cladding: remove loose paint; touch up steel screw heads/metal cover strips with zinc phosphate primer (SANS 1319); touch up brass screw heads with vinyl wash primer (SANS

723); apply one thinned coat plus one/two full coats per SANS 1586 as specified o Fibre-cement and gypsum ceilings: remove loose paint; touch up nail heads/cover strips with zinc phosphate primer (SANS 1319), spot-fill indentations; apply two coats emulsion paint per SANS 1586 grade/gloss as specified

TASK 10: Electrical Work and Certificate of Compliance

1. All electrical work must be performed by a certified, registered electrician

2. Disconnect, tag, label, and document all fixtures prior to roof/ceiling work; reinstall per Design Package electrical legend and layout upon completion

3. Contractor must provide a valid Certificate of Compliance (COC) for all electrical work prior to final acceptance

TASK 11: Rainwater Drainage Installation

• Install rainwater downpipes, outlets, and associated components per the Design Package layout and specification (e.g., 100x100mm seamless powder-coated rwdp)

TASK 12: Solar Panel Removal, Storage & Reinstallation

• Safely remove existing solar panels prior to roof covering removal

• Store panels securely on-site (or at an approved off-site location) for the duration of roofing works

• Reinstall panels to original or improved mounting positions upon completion of the new roof covering, ensuring all penetrations are properly flashed and weatherproofed

• Test panel function and connections upon reinstallation

TASK 13: Debris Disposal

• Remove all debris and waste materials from site daily

• Handle all materials in accordance with local waste disposal regulations

• Any ACBM-related waste must be handled, packaged, transported, and disposed of per SANS 10228 and SANS

10229, separately from general construction debris

• Obtain P.O.C. approval before removing any materials from site

• Leave the site in a pristine condition upon completion

7. POINTS OF CONTACT

(a) OBO/U.S. Embassy Pretoria – Project Manager (P.O.C.): Etienne Smit (b) OBO/U.S. Embassy Pretoria – Procurement:

Before a Purchase Order/Contract is issued, all communication shall be routed via the Pretoria Procurement agent assigned to the project.

8. PROJECT LOCATION

325 ies Street, Waterkloof Ridge, Pretoria, Gauteng, South Africa (ERF 365)

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9. PROJECT DURATION

Project start and end dates are to be confirmed and will be added at a later stage.

Notwithstanding the above, the Contractor shall submit a proposed project timeline / base construction schedule as part of its proposal submission, in a format of the Contractor's choosing (e.g., Gantt chart, bar chart, or tabular schedule), clearly indicating the sequence and estimated duration of the following phases:

• Asbestos survey and clearance

• Bracing/shoring design submission and OBO approval

• Rafter/roof structure design submission and OBO/Engineer approval

• Mobilization and site setup

• Existing roof covering removal

• Rafter removal and replacement

• Marley Double Roman tile roof covering installation

• Concrete slab roof sections and waterproofing (including required curing/testing time)

• Insulation and ceiling installation/finishing

• Plastering and painting (including drying time between coats)

• Electrical work and Certificate of Compliance

• Rainwater drainage installation

• Solar panel reinstallation

• Final inspection, punch list, and demobilization

Note: The proposed timeline must clearly show the asbestos survey/clearance and bracing/shoring approval as sequencing gates that precede any demolition activity — these may run in parallel with each other but both must be cleared before roof removal begins (see Sections 4.2 and 4.3). The Contractor should also factor in adequate drying/curing time for waterproofing, plaster, and paint where applicable.

Once a confirmed start date is issued via Purchase Order/Notice to Proceed, the Contractor's approved timeline will be adjusted accordingly and will serve as the baseline construction schedule for the project, subject to P.O.C. approval.

10. REFERENCE DOCUMENTATION

Design/Governing Document:

• Approved Design Package: Aries 325 - Roof Recovery Project- Roof Design Services_SOW

Safety, Health & Environmental:

• U.S. Army Corps of Engineers EM 385-1-1 Safety and Health Requirements Manual

• OBO Design Standards & Building Code

• United States Occupational Safety and Health Administration (OSHA) requirements

• South African Occupational Health and Safety Act (Act 85 of 1993)

• DOSAR clause 652.236-70 – Additional Safety Measures

• Hazardous Chemical Agents Regulations, 2021

• Asbestos Abatement Regulations, 2020

• Health and Safety Guidance 248: Asbestos

• SANS 10228 / SANS 10229 (hazardous waste packaging, transport, disposal)

Roofing, Timber & Structural:

• SANS 10237 Edition 2 (Roofing)

• SANS 10400 Part L Edition 4

• SANS 10243:2004 (Design, Manufacture and Erection of Timber Trusses)

• SANS 1900:2004 (Monoplanar prefabricated timber roof trusses)

• SANS 1783 / SANS 1460 (structural timber)

• SANS 1707 (Eucalyptus battens/brandering)

• SANS 1288 / 10005 (preservative treatment)

• SANS 1700 / SANS 820 (fasteners/nails); SANS 1477 (galvanizing, hangers/clips)

• SANS 952 (DPC/DPM/under-tile membrane)

• Marley (or approved equivalent) Double Roman Tile Manufacturer's Installation Guidelines

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Concrete & Masonry:

• SANS 1200G (Concrete – structural)

• SANS 10100 (Structural Use of Concrete)

• SANS 10052 (Construction of Strongrooms) — if applicable

• SANS 10109 Parts 1 & 2 (Concrete floor bases/finishes) — if applicable

• SANS 920 / SANS 1024 (reinforcement); ARP 040 (bending)

• SANS 227 (clay bricks); SANS 10400-K (masonry compressive strength)

• SANS 50197-1 / SANS 50413 (cement); SANS 1083 (aggregates); SANS 1090 (sand)

Waterproofing:

• SANS 10021 (Waterproofing)

Ceilings & Insulation:

• SANS 803 (fiber-cement board); SANS 266 (gypsum board)

• SANS 1381 (thermal insulation)

Plastering & Painting:

• SANS 50197-1 / SANS 50413-1 (cement); SANS 1090 (sand)

• SANS 1586 (paint); SANS 1319 (zinc phosphate primer); SANS 723 (vinyl wash primer); SANS 1227 (textured coating)

Electrical:

• Local Electrical Regulations and COC requirements

11. SAFETY REQUIREMENTS

11.1 General Safety

POSHOs want to ensure all contractors and subcontractors conduct their duties on behalf of the U.S. Government safely and healthfully. The Contractor shall accept all legal requirements and regulations currently enforced concerning safety for staff, technicians, workers, and the public whom the work may directly or indirectly impact.

The Contractor shall:

• Address structural demolition, bracing/shoring, and ACBM hazards specifically in pre-planning and safety meetings

• Review the work site before starting and identify all hazards

• Provide a competent person to implement the site safety and health plan

• Provide proof of local insurance for all employees

• Conduct daily toolbox talks and maintain records

• Report all accidents and near misses to the COR within 24 hours

11.2 Applicable Safety Standards

• U.S. Army Corps of Engineers EM 385-1-1 Safety and Health Requirements Manual

• United States Occupational Safety and Health Administration (OSHA) requirements

• South African Occupational Health and Safety Act (Act 85 of 1993)

• DOSAR clause 652.236-70 – Additional Safety Measures

• Hazardous Chemical Agents Regulations, 2021; Asbestos Abatement Regulations, 2020; HSG 248 (see Section 4.3)

11.3 Personal Protective Equipment (PPE)

• Hard hats, dust masks/respirators (upgraded respiratory protection required if ACBM disturbance is authorized, per licensed contractor's method statement), safety gloves, steel-toed footwear, eye protection, hearing protection, fall protection equipment, high-visibility vests

11.4 Working at Heights and Structural Demolition

• Any work conducted more than 1.83 meters (6 feet) off the ground requires a fall arrest/safety plan prior to commencement

• No wall, rafter, or roof covering removal work shall proceed until: (a) asbestos survey clearance has been obtained (Section 4.3), and (b) the approved bracing/shoring system is fully installed and inspected (Section 4.2)

• Use appropriate scaffolding — not ladders — for extended work at heights

• Scissor scaffolds are strictly prohibited; only certified multidirectional and modular scaffolding authorized

• Tile installers must use appropriate roof ladders/crawl boards and anchor points suited to a pitched tile roof

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11.5 Electrical Safety

• All electrical work performed by qualified, certified, registered electricians only

• Isolate power before commencing any roof/ceiling removal

• Implement lockout/tagout procedures

11.6 Emergency Response

• Fully serviced fire extinguisher and first aid kit on-site at all times

• Stop work immediately if unsafe conditions develop (including any sign of bracing/shoring failure, or unexpected discovery of suspected ACBM not previously identified) and notify P.O.C.

12. QUALITY CONTROL

The Contractor shall implement a quality control program including:

• Daily inspection of work in progress

• Independent inspection/sign-off of bracing/shoring installation before roof removal (Task 3)

• Confirmation of asbestos survey clearance documentation before demolition (Task 2)

• Embassy technician or Engineer inspection of rafter/roof structure work prior to tile installation, and receipt of the

Competent Person's post-erection Certificate of Approval (Task 5)

• Post-installation weathertightness verification of the tiled roof and concrete slab sections, including required flood/spark/vacuum testing (Task 7)

• Confirmation of 10-year waterproofing guarantee documentation prior to final acceptance (Task 7)

• Documentation of all quality control activities

• Correction of deficiencies before proceeding to next phase

• Final inspection and testing before project completion and demobilization

CONTRACTOR ACKNOWLEDGMENT

By signing below, the Contractor acknowledges that they have read, understood, and agree to comply with all requirements of this Contractor Guide and the accompanying Design Package.

CONTRACTOR SIGNATURE: _____________________________________________________

CONTRACTOR NAME (PRINT): _____________________________________________________

COMPANY NAME: _____________________________________________________

DATE: _____________________________________________________

END OF CONTRACTOR GUIDE