Attachment - 2025-0506 JV-COVA Replace Roof 1A_Bid Project Manual.pdf

PROJECT # 757-21-101

Replace Roof Building 1A

CHALMERS P. WYLIE VA AMBULATORY CARE CENTER (VAACC)

COLUMBUS, OH

PROJECT MANUAL

BID DOCUMENTS

May 21st, 2025

PREPARED BY

Site: Columbus OH, Chalmers P. Wylie VACC, Project No.: 757-21-101

Project Title: Replace Roof Building 1A

[i]

PROJECT MANUAL – BID DOCUMENTS

TABLE OF CONTENTS

OWNER’S PROJECT REQUIREMENTS

DESIGN NARRATIVE (BASIS OF DESIGN)

HAZARDOUS ABATEMENT

CIVIL

LANDSCAPE

STRUCTURAL

ARCHITECTURAL

FIRE PROTECTION

PLUMBING

MECHANICAL

ELECTRICAL

CONSTRUCTION COST ESTIMATE

Project # 757-21-101, Replace Roof Building 1A

BID DOCUMENTS PHASE Chalmers P. Wylie VA Ambulatory Care Center (VACC)

[2]

OWNER’S PROJECT REQUIREMENTS

OWNER AND USER REQUIREMENTS

Pertinent Project History

The budget was established in 2020 based on costs for EPDM roofing at approximately $32/SF.

Primary Purpose, Program, and Use of Project

The primary goal of this project is to provide the Chalmers P. Wylie Veterans Outpatient facility with a cost effective, durable, and reliable roof system. The A/E will perform an initial roofing investigation to develop improvement plans based on items identified in the walk-through and on information found in final roof condition report. Where deficiencies are identified, the A/E shall develop comprehensive corrective solutions such as replacement or restorations as well as a hybrid solution using both approaches.

Overarching Goals Relative to Program Needs

Replace approximately 130,000 SF of fully adhered TPO and PVC roof.

- Material used must be able to withstand local high winds and extreme weather.

- All existing items protruding the roof shall have a proper watertight seal around the items.

- All curbs will be inspected and replaced or waterproofed, as needed.

Lightning protection system will be assessed and recommended for reuse or replacement.

Relocate non-curbed HVAC around new work.

ENVIRONMENTAL AND SUSTAINABILITY GOALS

Specific Environmental and Sustainability Goals

Minimize odors to occupants during roof tear-off and installation.

Minimize noise above patient spaces and critical hospital spaces (e.g. Operating Rooms).

ENERGY EFFICIENCY GOALS

VA requested a minimum R-value of R-14 be maintained. Minimum code standards will be met where roof replacement occurs. The thickness of roof insulation and profile of roof will be maintained.

INDOOR ENVIRONMENTAL QUALITY REQUIREMENTS

All air intakes near the roof will be filtered during construction to minimize odors and VOCs into the building.

BUILDING OCCUPANT AND O&M PERSONNEL REQUIREMENTS

Occupant and Operations & Maintenance Personnel requirements have not been provided.

[3]

DESIGN NARRATIVE (BASIS OF DESIGN)

HAZARDOUS ABATEMENT

Not Applicable.

CIVIL

Not Applicable.

LANDSCAPE

Not Applicable.

STRUCTURAL

Fall protection is not a part of this project. Existing fall protection features will remain. All existing roof structure

(concrete and metal deck) will remain.

ARCHITECTURAL

Exterior Envelope:

Thermography Scans

On October 3rd, 2024 A/E performed thermographic scanning to obtain roof temperature differentials. The temperature differential indicated where moisture might have penetrated below the membrane. The thermographic scans work alongside the hydrogen density metering to indicate where coring samples were to be conducted. The results of this scan were submitted with the 35% phase deliverable.

Hydrogen Density Metering

On October 4th, 2024 A/E used a hydrogen density meter to detect the moisture content in the roofing materials. With electrical capacitance, pin type moisture meters push a very low level of electrical current between the probes to check for roofing material conductivity against a known baseline. Wet materials conduct more readily than dry materials. The baseline for a metal roofing substrate read around 5-8 and the baseline for a concrete roofing substrate read around 20-22. These variations can be seen in the testing results that were submitted with the 35% phase deliverable.

Core Samples

Once the thermography scans and hydrogen density metering were complete, core samples of the roof were taken and analyzed at locations with higher readings from the hydrogen density meter. These samples were also analyzed for moisture content to determine the depth of the water penetration. The wet roof areas were then marked with an orange paint marking. All core locations were patched with a compatible single-ply roof patch

(TPO and PVC, where applicable).

Analysis

On October 4th, A/E walked all roof surfaces to review the results of the thermography and HDM scans and analyze the general condition of the roof. A report of these results, including the composition of the roof (from core cuts) was in the 35% phase deliverable.

[4]

Our preliminary findings show that most of the roof is a single-ply 45 or 60 mil PVC roof membrane over tapered insulation, with some areas of light weight concrete. The roof at the east end of the building, over the O.R. suite is

TPO over tapered insulation. The TPO in this location has become delaminated from the insulation, plausibly from the “cupping” of the rigid insulation, which is presumed to be from moisture caused by the lack of vapor barrier at the roof deck. In general, the PVC is in decent condition, with very few instances of wet insulation found beneath the membrane.

Proposed Solutions

The A/E has identified the four following solutions for the VA to consider (The roof option matrix at the end of this section provides a visual when comparing the solutions to one another):

Option One – Replace all roofs with Ethylene Propylene Diene Terpolymer (EPDM) Roofing System.

(VA DID NOT CHOOSE THIS OPTION FROM A MEETING IN 12/2024)

The first solution for the VA to consider is full removal of the existing PVC (Polyvinyl Chloride) and TPO

(Thermoplastic Polyolefin) roofing systems. These roofs will then be replaced by a single-ply EPDM (Ethylene

Propylene Diene Monomer) roofing system. EPDM is one of the better single-ply roofing systems, but it is not ideal for institutions for several reasons. EPDM is not very resistant to chemicals like oil and grease, causing the roof membrane to deteriorate. EPDM is a flexible material; it can be easily torn and punctured. Although the

EPDM roof can be easily patched; the patches themselves can easily tear or be punctured. Due to this material’s characteristic, EPDM is not ideal for moderate to high foot traffic.

EPDM roofing is offered in large scale sheets which makes installation easier. Maintenance for the EPDM roof is more involved; relying on frequent inspections of the seams to ensure they are still withstanding and not allowing moisture to reach the rigid insulation below. Patchwork needs to be performed immediately once a tear or puncture has been identified. With water infiltration, EPDM roofs are prone to mold and mildew growth. Even with a hands-on approach to the maintenance of the roof system; EPDM is roughly a twenty-year roof system.

Unlike other single-ply roof systems, EPDM is a flexible roof system that can hold up to a variety of temperature changes and can handle building movement without cracking, breaking, or becoming brittle.

The appearance of EPDM is not the most desirable. They are not typically recommended for roofs that can be visible from floors above the roof. Unless paying a premium for titanium dioxide to produce a white EPDM roof surface, most EPDM roofs utilize carbon which creates its black appearance. Unfortunately, when carbon black is added, this substance converts UV rays into heat. During the hot months, this makes the roof’s surface substantially hotter than the ambient temperature. This increase in heat can cause the facility to increase its energy usage by trying to cool the building down. Besides the increase in energy used by the facility, this increased temperature on the roof’s surface will also assist in raising the Heat Island Effect in that area.

Lastly, this option calls for full removal of existing roof systems and then installing a new EPDM roof. The $32/SF estimate from 2020 will be significantly lower than an estimate using today’s prices. This will equate to not being able to resolve all the roof surfaces in the scope of work. Another challenge to this solution is that some sections of the roofs are over specialty spaces such as the operating rooms, and sterile processing services. The work in these areas will have to be conducted after normal VA business hours or on weekends. This in turn will drive up the construction cost. Due to the challenges and concerns previously mentioned throughout this solution, A/E does not recommend this solution as the best option available moving forward.

[5]

Option Two – Replace all roofs with Modified Bitumen Roofing System.

(VA DID NOT CHOOSE THIS OPTION FROM A MEETING IN 12/2024)

This solution is like the first solution with regards to a full removal of the existing roof but differentiates with the introduction of installing a modified bitumen roof system. Modified bitumen (modified bit) is a multi-ply roofing system that is considered the most popular and commonly used system for flat and low-sloped roofs. This type of roofing surface involves two main components, asphalt and the modifier. The modified bitumen we are proposing would be a two-ply styrene butadiene styrene (SBS)-modified bitumen roof using a cold-applied adhesive system. Modified bitumen roofs have become known for their great flexibility, weather resistance and durability. The roof system can accommodate extreme temperatures allowing for the material to expand and contract without cracking or getting brittle. The roof system’s durability makes it ideal for roofs that will need to accommodate higher volume of traffic.

Although roof maintenance is not as involved as the EPDM roof system, installation of a modified bitumen roof can provide a challenge. The challenge is that the modified bit roof needs to be installed by a certified professional. Unlike a single-ply roof, a multi-ply roof system requires at least twice the labor of a single ply roof considering the base sheet and then the cap sheet. Maintenance on a modified bit roof is not as involved as EPDM roof but is still needed. Perform a periodic inspection and fix/repair any issues right away to ensure longevity. A good, modified bitumen roof can last twenty to thirty years if it is properly installed and maintained. Finally, this roofing method is also resistant to fires and combusting, making it an appealing option for safety reasons. Since these roofs are made to be fire resistant, they are not eco-friendly particularly regarding waste generation.

The appearance of modified bit roofs is similar to EPDM roofs; meaning they do not have the best appearance.

They are not typically recommended for roofs that can be visible from floors above. Just like EPDM, the roofs can have a reflective coating or surface added for an extra cost. Many modified bitumen roofs have a black or dark grey appearance which causes the sun’s ultraviolent rays to be absorbed by the roof. This increase in heat can cause the facility to increase its energy usage, cooling the facility down. Not only will there be an increase in the energy consumption of the facility but will also contribute to the heat island effect of the immediate area.

Another note to add here is that if the modifiers added in the roof system are not designed to be UV-resistant; the roof can degrade and begin cracking.

Again, this option calls for the full removal of the existing roof system and then installing a new modified bitumen roof. The $32/square foot estimate from 2020 will now be much higher when using today’s construction costs.

The modified bitumen roof will provide the VA with a multi-ply roof system that should protect better than the

EPDM roof. The downside is that a modified bit roof will cost more to install than the EPDM. That translates to installing a roof system that is more suitable for the needs of an institution like the Veterans Outpatient Clinic facility but will only allow for a smaller amount of roof surface to be replaced when compared to the EPDM option previously mention (to meet the budget). As with the EPDM roof option, another challenge to this solution is that some sections of the roofs are over spaces that are sensitive to adjacent construction like operating rooms, and the sterile processing services area. The work in these areas will have to be conducted after normal VA business hours or on the weekends. This in turn will drive up the construction cost. Due to the challenges and concerns previously mentioned throughout this solution, A/E does not recommend this solution as the best solution available moving forward.

[6]

Option Three – Replace roof damage in kind and restore all roofs; Roof 5, 5A and 5B will be replaced with EPDM.

(VA CHOOSE THIS OPTION AS THE ‘BID ALTERNATE’ FROM A MEETING IN 12/2024. UPDATE 3/24/25: THIS IS

NO LONGER THE BID ALTERNATE BECAUSE THE DIFFERENCE BETWEEN EPDM AND MODIFIED BITUMEN WAS A

FIFTEEN HUNDRED DOLLAR CHANGE IN COST)

This solution involves two steps, replacement of damaged roof sections based off the findings of the Roof

Diagnostic Survey (refer to Exhibit A) and restoration of the entire roof surfaces in scope. The damaged/wet portions of the roof will be removed down to the deck. The roofs will be replaced with either the PVC or TPO roofing systems depending on the location. This solution intends to replace roofs 5, 5A, and 5B in their entirety with EPDM roof system. After all roof damaged has been replaced, restoration will be conducted on the roofs in scope except roofs 5, 5A, and 5B. This is performed by installing a fluid-applied coating on the existing/new roofs.

The material is poured from buckets onto the roof and squeegeed around for universal coverage. The fluid applied barrier will provide anywhere from ninety to one hundred mil thickness of protection over to the existing forty-five to sixty mil protection of existing/replaced single-ply PVC or TPO roof system. This replace and restore roof solution will provide a total of 135 to 160 mil of protection.

Although the replaced roof portions will be with the single-ply PVC or TPO roof system, the fluid applied system will protect that initial roof system. When the fluid-applied system is installed, there will be a monolithic layer protecting the original roof system. The fluid-applied aspect of this roof system is that there are no seams to have to frequently inspect. This membrane also protects the seams of the existing PVC and TPO roofs. Similarly to the

EPDM, this roof system needs to be periodically inspected. If there are any areas of the fluid-applied membrane found to be thinning or damaged, maintenance just requires applying a bit of the fluid material in the areas of concern to restore the membrane. The fluid-applied material performs well enough that it can also be used for flashing around penetrations. The membrane also performs well in cold weather and resists chemicals, hail, mildew and mold. Because it is a monolithic system it is also flexible, expansion and contraction along with building settling do not create a concern. The durability of this solution allows the roof to perform for twenty to thirty years.

Unlike the EPDM and modified bitumen solutions, the fluid-applied membrane in this solution is a light color material that has a desirable appearance. This makes it suitable for roof surfaces that will be visible from spaces that are higher in elevation. The light color will also allow for reflectivity, so the roof system is not absorbing all the sun’s ultraviolet waves. When compared to the previously mentioned solutions, this solution will not require extra energy consumption to cool the building down along with reducing the potential heat island effect of the immediate area. This solution is also ecologically friendly because it calls for only replacing damaged portions of the roof, meaning that less material will make its way to the landfill. Like the other roofing solutions, two portions of the roof that are over the sterile processing services area need to be replaced which will require the work to be done after normal business hours or on the weekends. Another benefit to this roofing system is the fluid-applied restoration can be done during normal business hours because applying the material doesn’t require machinery to run creating noise and any off gassing is marginal due to its bio-based composition. Only replacing the damaged roof portions and restoring the rest of that roof’s surface creates less demolition work and should allow the contractor to resolve more of the roofs in the scope of work. Since this roof solution provides more advantages than challenges when compared to the first two solutions; the A/E recommends this solution as a viable option.

[7]

Option Four – Replace roof damage in kind and restore all roofs; Roof 5, 5A and 5B will be replaced with modified bitumen.

(VA CHOOSE THIS OPTION AS THE ‘BASE BID’ FROM A MEETING IN 12/2024)

The fourth and final solution to present is very similar to solution three, but since roofs 5, 5A, and 5B must be fully replaced; the replacement roofing system would be modified bitumen. All other damaged roof portions will be replaced in kind whether that is PVC or TPO. Most of the advantages with solution three will also apply to this solution with exceptions. Replacing roofs 5, 5A, and 5B with modified bitumen instead of EPDM like in solution 3 will provide a better roof system than the existing system that has failed completely in these areas. Installing a multi-ply system would be more appropriate given the facility and its functions. Although putting a modified bit roof will cost more on those roof surfaces; it is fortunately the smallest sections of roofs in the scope of work. The only additional setback the A/E perceives with this solution compared to solution three is that since modified bitumen cost more than EPDM, the extra cost for modified bitumen could cause a smaller percentage of the roofs in scope to be restored than with solution 3. Even though this solution may limit what percentages of roofs get restored, the A/E believes having a multi-ply roofing system where the roofs have completely failed will provide the best solution for that area and thus is the best recommend solution of the four options presented.

Option Four UPDATE for 04/21/25 100% Construction Documents Submission:

After further investigation into the existing conditions for roofs 5, 5A, and 5B; it is determined that modified bitumen roof systems would require altering the metal panel exterior walls of the building for installation. Given that the project is close to budget, modifying the existing exterior walls is not feasible. In these areas, we are proposing a fluid-applied waterproofing and paver roof system. This system will include a base layer roof membrane. Then a layer of liquid-applied reinforced flashing will be applied in areas requiring flashing which will be followed by a layer of liquid-applied reinforced base coat. The base coat will then be covered by a liquid-applied topcoat. Then a layer of extruded polystyrene will be placed over the topcoat. The final layer over the polystyrene will be the installation of hydraulically press concrete pavers. This will provide the waterproofing this roof area requires along with durable protection from the pavers.

[8]

Single Ply(1 ply)

Replacement

Modified Bitumen(MB)

Replacement

Built Up (BUR)

Replacement Restoration Over 1 ply

Durability

- Typically 45-60 mil thickness

- Least durable option.

- Prone to tearing / punctures.

- Not ideal for institutions and long term solution needs

- Very durable

- Ideal for higher foot traffic.

- Multi-ply 280 mil membrane.

- High puncture resistance

- Typically mineral surfaced

- Very durable

- Ideal for higher foot traffic.

- Multi-ply 350 mil thickness

- Highest puncture resistance

- Typically gravel surfaced

- Polyester reinforcement adds significant durability to 1 ply.

Tolerates most roof needs.

- 90-100 mil fluid applied over existing 45-60mil systems.

- 135-160 mil of final protection.

Installation

- Quickest installation of all roof replacement options.

- With only 1 ply, seam installation integrity is critical.

- Solvent & solvent free option

- Slower installation than 1 ply

- More labor needed than 1 ply

- Solvent & solvent free option

- Requires more skill than 1 ply

- Can be 2 or 3 ply system

- Slower installation than MB

- Solvent & solvent free option

- Requires most skilled labor

- Typically a 3 or 4 ply system

- Solvent & solvent free option

- Replace isolated deteriorated portions of the roof. Reuse remaining in place asset.

- Minimal impact to facility operating processes compared to disruptive replace options.

Maintenance

& Safety

- Frequent inspections of seams/penetrations needed.

- Slippery when wet.

- Thermoplastic systems (TPO, PVC, KEE) unwalkable with frost, ice, snow

- Naturally a non slip system

- Easy inspection & maintenance. Small problems can be found and easily repaired

- Naturally a non slip system.

- More difficult inspection but easy to maintain. Small problems can be found and easily repaired

- Areas needing a non slip surface, can receive a second top coat with embedded grit.

- Walkway systems are best for high traffic areas.

- Easy inspection & repair.

Longevity

- 10-20 years depending on type, install and maintenance.

- Indefinite with maintenance and resurfacing if installed and maintained properly

- Indefinite with maintenance and resurfacing if installed and maintained properly

- Indefinite with maintenance and resurfacing if installed and maintained properly

Material

Resistance

-- Chemical resistance varies by sheet. EPDM not resistant to petroleum, oil, and grease.

- Resilient against chemicals, hail mildew, mold and corrosive substances.

- Resilient against chemicals, hail mildew, mold and corrosive substances..

- Resilient against chemicals, hail mildew, mold and corrosive substances.

Appearance -Not recommended for roofs that will be visible. Shows dirt accumulation quickly.

- Good appearance, hides dirt better than 1 ply

- Color and reflective options

- Uniform appearance, no seams and hides dirt best of all options.

- Color and reflective options.

- Good appearance, no seams but it can show dirt.

- Color options.

[9]

Flexibility

- Early on, single ply systems can withstand variety of temperature changes and building movement but this decreases with time as sheets age, shrink and lose flexibility.

- System is inherently flexible to expand and contract with temperature changes. This remains throughout system life.

- System is inherently flexible to expand and contract with temperature changes. This remains throughout system life.

- The fluid applied system creates a monolithic flexible membrane.

- It can also be used as a flashing system.

Energy Usage

- Color and R value drive energy usage

- Darker roofs require more energy to cool the facility.

- Black surfaces creates Heat Island Effect.

-Color and R value drive energy usage.

-Standard color is white/light gray.

-Color options are available

-R value drives energy usage.

-Standard color is medium gray.

-Color options are available

- Typical surface is highly reflective white

- Significantly lower rooftop temperatures.

- Reduces the Heat Island Effect.

Noise

- Roof replacement will create noise to the occupants below.

- Roof replacement will create noise to the occupants below.

- Roof replacement will create noise to the occupants below.

- Noise only generated in localized replacement areas.

- Fluid applied restore process generates minimal noise.

Duration /

Phasing

- Roof replacement duration and phasing will be dependent on what the facility can tolerate in terms of noise and odors.

- Some work may need to weekend or off hours which increases the cost impact.

- Roof replacement duration and phasing will be dependent on what the facility can tolerate in terms of noise and odors.

- Some work may need to weekend or off hours which increases the cost impact.

- Roof replacement duration and phasing will be dependent on what the facility can tolerate in terms of noise and odors.

- Some work may need to weekend or off hours which increases the cost impact.

- Other than for the localized replacement areas, this is the fastest project completion approach. Unless over super sensitive areas, can generally be done without any impact to operations thereby eliminating additional weekend & off hours cost impacts.

Cost

- Lower first cost impact than MB & BUR options.

- Highest life cycle cost.

- Increased first cost over single ply but significantly lower life cycle cost

- Increased first cost over MB but significantly lower life cycle cost than 1 ply

- Lowest first cost

- Lowest life cyle cost

[10]

Overall

- Best for shorter term solution durations and with no foot traffic.

- Life cycle cost wise is generally 2-4x the cost of Restoration, MB & BUR systems

- Ideal (sweet spot) replacement option for institutional/ long term solution facility needs.

- Maintainable long term.

- Naturally non slip so safe for access 12 months of the year.

- Low life cycle cost

- Preferred system for very high foot traffic needs where maximum roof durability and roof top slip resistance is required.

- Longest track record for all low slope roof system options.

- Most expensive roof replacement first cost, but low life cycle costs and maintainable long term.

- Best first cost and life cycle cost of all options

- Maintainable long term.

- Warranty length as long as client desires

- Allows client to complete more roof scope work and free up capital for other infrastructure maintenance needs.

- Diagnostics required to determine if the roof system is a restoration candidate

Color Legend: Green = Best Yellow = Moderate Orange = Significant Concern Red = Least Desirable

[11]

It is recommended that the VA consider maintaining much of these roofs by applying a fluid-applied rehabilitation system over the existing roof.

For cost analysis, at the 35% Schematic Design deliverable, A/E showed all roofs being replaced with a single-ply

Ethylene Propylene Diene Monomer (EPDM) membrane roof system. The cost was well beyond the budget and so a restoration option was considered. In the restoration option, only roofs found to have moisture beneath the membrane will be replaced and a fluid-applied self-flashing membrane will be provided over the remaining roof membrane system. Comparatively, the restoration system has less material sent to the landfill, less odor, less cost, is less intrusive, and provides more thickness of protection (120+ mil vs 45-60 mil for a single-ply EPDM membrane). Both options will include a 20-year warranty of the roof system. Replacement over sensitive areas

(e.g. SPS) will need to be planned for weekend-only hours, whereas restoration scope can be installed over sensitive areas without the general application needing to be installed during off-hours.

A comparison of EPDM, SBS modified bitumen, and a fluid-applied restoration system were submitted with the

35% Schematic Design phase deliverable to help assist the VA with selecting the best system for the Columbus VA facility.

Walkways

Most of the existing walkway pads are rubber pads adhered to the roof membrane. In several locations, the water appears to have trouble navigating around the walkway pads to flow to the roof drains. In other locations, the walkway pads had deteriorated to allow water to be held between the pad and the roof membrane. A new FRP walkway system will be provided.

Interior Systems:

Any roof drain replacement will require access to the interior space below the roof drain location. The VA has provided Capital Asset Inventory (CAI) plans for A/E to determine areas of roof that will need to be accessed for roof drain replacement (if applicable) and for areas that are recommended for weekend-only or off-hours work.

Full replacement of roof drains is not anticipated.

Base Bid:

The base bid that has been approved by the VA is to replace damaged portions of the roof in kind. After damaged portions have been replaced, a fluid-applied membrane will be applied to restore the effectiveness of the roofs.

The base bid applies to roofs 1(A - D), 3(A & B), 6, 7(A), 12, 13, 14(A & B), and roof 17(A & B). Roofs 5, 5A, and 5B will be replaced by a modified bitumen roof system.

Bid Alternates:

The bid alternate descopes roofs 6, 12 and 13 from the project.

Code Compliant Design:

All work will conform to the:

NFPA 101 Life Safety Code, National Fire Protection Association

NFPA Fire Codes with the exception of NFPA 5000 and NFPA 900, National Fire

Protection Association

OSHA Standards

[12]

FIRE PROTECTION

Fire protection design is not anticipated to be a part of this project.

PLUMBING

New roof drains shall be designed to match the existing system (Zurn).

New drains shall be cast iron with clamping device for making watertight connection and shall conform with ASME

A112.6.4. Free openings through strainer shall be twice area of drain outlet. New roof drains are not anticipated at this time, but any broken, missing, or plastic drain baskets and clamps will be replaced.

Miscellaneous:

Seismic design considerations are included in the scope of work.

All work will conform to:

International Plumbing Code, 2012 edition, International Code Council

MECHANICAL

Rooftop equipment that are anticipated to be affected are limited to outdoor condensing units and equipment on roof supports not flashed into the existing roof. Utilities serving this equipment will all be disconnected and temporarily capped during roofing work under the equipment. Special precautions will be taken to protect the existing equipment and utilities during construction. After reinstalled, and where applicable, a re-testing effort will be required to restore equipment functionality. Curbs and support rails are not anticipated to be modified or replaced as needed to accommodate the new roof. New roofing will be flashed to the existing curbs and support rails with equipment remaining in place. For all roof equipment, the design team will analysis equipment mounting height and adjust as needed to account for any added roofing/insulation height.

Additionally, all equipment and supports that are exposed to wind will be re-anchored to the new roofing structure to resist the wind pressure requirements. Both removed and reinstalled equipment and equipment to remain in place.

All work will conform to 2017 VA HVAC Design Manual (with 2024 revisions), ASHRAE 90.1-2021, or ASHRAE 170-

2021, whichever is more stringent. Seismic design considerations are included in the scope of work.

Life-cycle Cost Analysis

Not Applicable.

Miscellaneous:

Seismic design considerations will be included in the scope of work.

All work will conform to:

International Mechanical Code, 2009 edition, International Code Council

Ventilation for Acceptable Indoor Air Quality – ASHRAE 62.1

Ventilation of Health Care Facilities – ASHRAE 170

ELECTRICAL

Smaller HVAC units will be temporarily disconnected and reconnected electrically to accommodate the new roofing installation.

[13]

The existing lightning protection system will be removed from all roofs within scope, salvaging only the down conductors and ground rods (and anything below the roof level). All existing to remain roofs shall be reconnected to the new system as required.

Copper roof conductors and air terminals will be utilized, unless installed on existing aluminum materials. Air terminals will be 18” long with blunt points. All metal on the roof will be bonded. Roof conductors will be exothermically welded to the existing down conductors.

The new lightning protection system will be designed and installed to meet both the VA Electrical Design Manual and NFPA 780 standards. The new system will be certified with a UL Master Label.

Calculations:

Seismic design considerations will be included in the scope of work.

All work will conform to the:

National Electric Code, NFPA 70, 2017 Edition, National Fire Protection Association

Standard for Electrical Safety in the Workplace, NFPA 70e, 2018 Edition, National Fire Protection

Association

[14]

CONSTRUCTION COST ESTIMATE

The construction budget for this project is $4,137,400. A cost estimate was provided after the 35%

Schematic Design submission. Due to unexpected rates of inflation and construction industry cost escalation, the full replacement of the roof will not fit within the current budget. To maintain the budget, the design will include either scope reduction (e.g. removing areas of roof from the scope) or restoration

(e.g. fluid-applied system over existing roofs deemed to be in suitable condition).

[15]

EXHIBIT A: Roof Diagnostic Survey