19SA7026Q0009-0002.pdf

mailto:RiyadhContracting@state.gov

Solicitation no. 19SA7026Q0009 Roof Repairs and Insulation at DOW Annex Offices

Embassy of United States of America Riyadh, Saudi Arabia

*Note: no edits were made to the original questions submitted by vendors.

QUESTION* AND ANSWER (Q&A)

SOLICITATION # 19SA7026Q0009

ROOF REPAIRS AND INSULATION AT DOW ANNEX OFFICES

Q1. SPF Minimum Thickness Section IV (Scope of Work and Deliverables) references an application rate of "1.5 to 2 kg per m²" but the Quality Assurance requirements specify a minimum installed thickness of 5 cm via depth gauge verification. Please confirm whether the 5 cm minimum thickness governs, or whether the kg/m² application rate is the controlling specification.

A1. 1.5 to 2 kg per m² is for the ceramic roofing granules, SPF will be 45 kg/m³ with 5cm thickness.

Q2. Waterproof Coating Specification the SOW specifies a UV-resistant elastomeric waterproof coating in two contrasting colors (gray base coat, white topcoat).

However, no minimum dry film thickness (DFT) in mils, specific product, or governing performance standard (e.g., ASTM, manufacturer technical data sheet) is referenced. Please provide either an approved product list or the minimum DFT and performance standard the coating must meet for each coat to be accepted during inspection.

A2. There is no governing Approved Product list, all products shall be approved prior to the execution by the COR. SDS and relevant documents need to be submitted after award. All material must be a high-performance, specific to the application.

ASTM D6083 & ASTM D6694.

Required Thickness Base Coat: Minimum Dry Film Thickness (DFT) of 15 mils (approx. 24 mils Wet Film Thickness / WFT).

Top Coat: Minimum Dry Film Thickness (DFT) of 15 mils (approx. 24 mils Wet Film Thickness / WFT).

Total System Minimum Thickness: A combined minimum cured thickness of 30 dry mils across the entire roof area.

Q3. Primer Specification the QA section references an adhesion pull test on a "primed area" before full SPF application, but no primer product or specification is included in the SOW. Please provide the required primer type and any compatibility requirements with the metal substrate and the SPF system.

A3. Primer needs to be compatible with roof surface and SPF system.

Q4. Metal Roof Repair Scope the SOW states the contractor shall "remove old membrane, repair the metal roofing" before applying SPF, but does not quantify the extent of metal roof repairs anticipated. Please clarify:

(a) whether a condition survey/inspection report is available,

(b) the approximate percentage of roof panels requiring repair or replacement, and

(c) whether the Government has an estimate for the number of corroded or perforated panels.

A4. (a) No Report available.

(b) Consider 40 percent.

(c) NA.

Q5. AC Duct Insulation Specifications the SOW specifies 20 M³ of AC duct insulation replacement but does not define the insulation type, thickness, facing material, or thermal performance requirement for the ductwork. Please provide the technical specifications or product standard for the duct insulation.

A5. Refer to the scope. Information is provided under “AC Duct Insulation & Repair”

Q6. Gutter and Downspout Material and Profile the SOW calls for dismantling and replacing 185 LM of gutters and downspouts but does not specify: (a) gutter material (galvanized steel, aluminum, etc.), (b) gutter profile and size (box gutter dimensions), (c) downspout cross-section dimensions, or (d) required finish/color. Please provide these specifications or reference a standard drawing.

A6. (a) Galvanized material mentioned in Scope.

(b) Profile and size shall be suggested by vendor, based on the flowrate requirements of the roof.

(c) 4-inch diameter.

(d) Match existing. Drawings shall be provided by vendor for prior approval.

Q7. Roof Drawings / As-Built Drawings The solicitation does not include any architectural or structural drawings, roof plan layouts, or as-built documentation for the Freedom Hall roof. Without dimensioned drawings, offerors cannot verify the approximate quantities stated in the SOW (2,000 m² coating, 185 LM gutters, 20 m³ duct).

A7. Dimensions taken on site will be provided with pictures.

Q8. Existing Roof Condition Has the Government conducted any previous structural assessment or condition survey of the Freedom Hall roof? If so, please share the findings, as they are material to accurately scope the metal repair work prior to SPF application.

A8. NA

Q9. Site Access and Security Clearance Requirements Please confirm the process and lead time for obtaining site access for non-U.S. personnel for during contract performance. Are specific visa categories, security clearance documents, or Embassy badges required for contractor workers?

A9. This information shall be provided after the award.

Q10. Notice to Proceed (NTP) Timeline The solicitation states a 25-working-day performance period commencing upon NTP but does not indicate the anticipated date of award or the expected NTP issuance date. Please provide the Government's anticipated award date and NTP issuance window so that the mobilization plan and workforce schedule can be prepared accurately.

A10. Sufficient time will be provided after the award date for the preparation before the NTP.

Q11. Staging Area Details Section V (Logistics) notes that staging/storage areas are available on Embassy grounds. Please provide:

(a) the approximate available staging area dimensions,

(b) whether the area is covered or open, and

(c) any restrictions on the type or quantity of materials that may be stored on-site (e.g., flammable SPF components).

A11. (a) Open space available. No limitation on dimensions.

(b) Open area.

(c) Follow the manufacturer’s recommendation for the storage procedure.

Q12. Weekend Work Authorization the SOW states work may need to be scheduled on weekends to avoid disruption to Embassy operations, but the holiday schedule references a Sunday-Thursday workweek. Please confirm whether weekend work (Friday and Saturday) is permitted, whether it requires advance COR approval for each instance, and whether any premium or overtime cost consideration applies.

A12. Advance notice and approval required from COR. No Premium or Overtime Cost will be compensated after the award.

Q13. Please provide photographs and specifications (including size) of the ceramic roofing granules required under the scope of work.

A13.

#11 roofing granules for traction. The granules must be embedded 50% of the diameter within the wet paint layer.

Q14. Please provide photographs showing the SPF (Spray Polyurethane Foam) application at the bottom of the walls.

A14. Pictures and videos will be provided.

Q15. Kindly share any photographs and videos taken during the site visit, if available, for better understanding of the existing site conditions.

A15. Pictures and videos will be provided.

Q16. Roof Lighting and Electrical Conduits: During our site visit, the existing lights appeared to be old and deteriorated. In the event that any of these fixtures are damaged or found to be non-operational during execution, please advise how such items should be handled.

A16. Care needs to be taken, anything damaged due to negligence shall be replaced at contractor’s cost.

Q17. Roof Drawings and Photographs: Kindly provide roof photographs and relevant drawings, including dimensions, to enable us to accurately assess the scope and prepare our pricing.

A17. Pictures and videos will be provided.

Q18. Period of Performance: Based on our site visit, we observed that additional work appears to have been added to the Scope of Work. Please advise on the updated Period of Performance accordingly.

A18. No additional work was added. Any observations noted during the site visit have been provided at the bottom.

Q19. Specification of Preferred Waterproofing Material Brands The RFP documents do not specify any preferred or approved brands for waterproofing materials and accessories. Kindly advise whether the Client has any brand preferences or an approved manufacturers list (AML) that the Contractor is required to comply with, so that material submittals may be prepared accordingly.

A19. Contractor needs to provide suggestions and Datasheets for approval.

Q20. Temporary Relocation of Building Occupants During Waterproofing Works

Please confirm whether the building occupants will be temporarily relocated during the execution of waterproofing works, or whether the building will remain occupied throughout the construction period. This information is required to develop the appropriate phasing plan, access arrangements, and HSE controls within the Method Statement.

A20. Building will be occupied.

Q21. Preferred Work Sequencing / Priority Zones

Kindly advise whether the Client has a preferred sequence or priority area within the building from which waterproofing works should commence, prior to progressing to remaining zones. This will enable the Contractor to develop a phased execution plan aligned with the Client's operational requirements.

A21. No.

Q22. Requirement for Waterproofing Coating on the Underside of Side Metal

Cladding Sheets The RFP documents do not explicitly specify whether waterproofing coating is required to be applied to the external face (underside) of the side metal cladding sheets. Kindly clarify whether the scope of works includes the application of waterproofing coating to the external face (underside) of the side wall metal sheets.

A22. Only outside.

Q23. Replacement of Deteriorated Plywood Substrate Beneath Roofing System

During the site visit it was observed that the existing plywood substrate underneath the roofing system has significantly deteriorated and is not in a condition suitable to receive the new waterproofing system. However, the replacement of this plywood substrate does not appear to be included within the current scope of works as defined in the RFP documents.

Kindly confirm whether the removal and replacement of the deteriorated plywood substrate falls within the Contractor's scope of works.

A23. Remove the damaged plywood, replacement not required.

Additional Information

• Spray foam shall also be applied along the bottom edge of the warehouse perimeter.

Approximately 30 cm high.

• All waterproofing membrane needs to be removed. All gutters and drains shall be removed and disposed of.

• Dumpster will be kept on site and replaced as necessary by the contractor.

• Scaffolding needs to be certified and safe for application, shall have stairs, proper landing area and handrails at the minimum.

• The Contractor shall provide lifeline structure for fall protection for the staff working on the roof.

• Any changes in the schedule will be coordinated with the successful candidate in advance by the COR.