This project is comprised of approximately 10 buildings of concrete block and steel construction.  Roof structures are primarily bar joists with light gauge steel decking with either lightweight concrete or gypsum decks, which are providing some drainage.  Bar joists are bearing on poured concrete tie beams, the presence of steel imbeds is unclear, bar joists appear to be level.  Roof systems vary by building but are consistently asphalt based built up with either gravel or cap sheet.

Square Footage as follows:

Building “A” 19,825   Building “B” 8,711   Building “C” 13,325   Building “D” 5,551   Building “E” 5,551   Building “F” 8,100   Building “G” 5,822   Building “H”     Building “I”     Building “J” 24,310   Building “K” 10,065   Building “L” 6,588   Total 107,848 1,078 Roofing Squares Delete "D" & "E" (11,102)   Revised Total 96,746 967.5 Roofing Squares

Observations:
Building "A" 1The roof structure on this building consists of light gauge steel decking puddle welded to bar joists. Gypsum is placed over the steel deck. Roof cores indicate two roofs with areas of elastomeric coating.
2This core indicates moisture trapped beneath the top layer of roofing and the first layer installed over the gypsum deck.
3This core indicates the thickness of the two installed roofs. The pasty nature of the gypsum is due to the high moisture content.
4This is a view down inside the core hole, the brownish area indicated by the arrow is corrosion of the steel deck, the lighter sand like material is the gypsum decking.
Building "B" 5Building "B" is typical to building "A" in overall construction.
6This core indicates the thickness of the two installed roofs. The white material is the elastomeric coating utilized as a repair in some areas.
7This is the bottom of the first layer of the original roof, which is presumably attached to the gypsum. The wet brown material is the gypsum. This is demonstrative of the level of moisture trapped in this roof system.
8Fiberglass shingle roof on building "B"
Building "C" 9Building "C" is typical to building "B" in overall construction.
10This core indicates the existence of one roof system. One base sheet presumably attached to the gypsum deck with a granulated cap sheet mopped to the base sheet. Gypsum is reasonably dry at core location.
11All roof top mounted A/C units will need to be placed on new aluminum stands, all buildings. Minimum 18" off the finish roof.
Building "D" 12Building "D" is typical to building "C" in overall construction.
13The roof structure on this building consists of light gauge steel decking puddle welded to bar joists. Gypsum or lightweight concrete is placed over the steel deck. Elevation is higher than other buildings on site.
Building "E" 14Building "E" is typical to building "D" in overall construction. TO BE DEMOLISHED.
Building "F" 15Building "F" is typical to building "D" in overall construction.
16This core indicates the thickness of the two installed roofs. The white material is elastomeric coating utilized as a repair. Gypsum is reasonably dry at core location.
Building "G" 17Building "G" is typical to building "F" in overall construction. Roof type is typical to building "F". No core was taken.
Building "H,I,J"
18This core indicates the existence of one roof system. One base sheet presumably attached to the lightweight deck with what appears to be 2 plies of fiberglass ply sheet. Lightweight concrete appears to be reasonably dry.
19This core indicates the existence of one roof system. One base sheet presumably mechanically attached to the lightweight concrete and 3 plies of fiberglass ply sheet with aluminum coating. Lightweight concrete appears to be reasonably dry. This core is the low elevation of this building.
20This core indicates the existence of one roof system. One base sheet presumably mechanically attached to the lightweight concrete and 3 plies of fiberglass ply sheet with what may be a poor asphalt glaze or an alternative coating, some aluminum coating is present. This core is the high elevation of this building. The lightweight concrete appears to be reasonably dry.
Building "K" 21The roof structure on this building consists of light gauge steel decking puddle welded to bar joists. Gypsum or lightweight concrete is placed over the steel deck.
Building "L" 22The roof structure on this building is unique to the site. This roof deck is structural poured in place concrete with concrete block parapet walls.
23There is no roof present, the cracks in the structural concrete have been sealed with a generous application of the roof cement.
Cost Analysis:
Building "A" - Acceptable roofing practice and building codes preclude the installation of more than two roof systems. The moisture level in the gypsum deck is unacceptable for the installation of a new roof system. Intended use of the building requires the installation of a roof insulation. The steel deck does not meet the 22 gauge requirement set forth for screw attachment if the insulation were to be screwed on top of the gypsum through to the steel deck. The only viable alternative is complete removal of the existing roofing, gypsum and steel deck. Upon removal the bar joist span will be exposed which will allow access to the center bearing. Raising the center 6" will provide slightly less than ½"/foot slope to adequately drain the new roof.
Scope: Deck Removal & Replacement Complete removal of the existing roof material, complete removal of the existing gypsum decking, complete removal of the existing light gauge steel deck, installation of new 22 gauge steel deck.  Installation of pressure treated wood nailer. New Roof Mechanically attach with screws R=19 isocyanurate insulation with base sheet to steel deck, mop 3 plies type 4 ply sheet, alumacoat. Building “B” Scope: Deck Removal & Replacement Complete removal of the existing roof material, complete removal of the existing gypsum decking, complete removal of the existing light gauge steel deck, installation of new 22 gauge steel deck.  Installation of pressure treated wood nailer. New Roof Mechanically attach with screws 1-1/2” perlite insulation with base sheet to steel deck, mop 3 plies type 4 ply sheet, alumacoat. Building “C” Scope: New Roof Prime existing roofing, mop install one layer white granular surface SBS. Remove and replace perimeter edge metal. Building “D” Scope: TO BE DEMOLISHED Building “E” Scope: TO BE DEMOLISHED Building “F”    Scope: Remove existing roofing to expose gypsum deck, nail base sheet with mechanical fasteners, mop 3 plies type 4 ply sheet, replace perimeter flashing metal, alumacoat. Building “G”  Scope: Remove existing roofing to expose gypsum deck, nail base sheet with mechanical fasteners, mop 3 plies type 4 ply sheet, replace perimeter flashing metal, alumacoat. Building “H”-“I”-“J” Scope: Remove existing roofing to expose gypsum deck, nail base sheet with mechanical fasteners, mop 3 plies type 4 ply sheet, replace perimeter flashing metal, alumacoat. Building “K” Scope: Remove existing roofing to expose gypsum deck, nail base sheet with mechanical fasteners, mop 3 plies type 4 ply sheet, replace perimeter flashing metal, alumacoat. Building “L” Scope: Prime concrete deck, mop 1” perlite insulation, mop 3 plies type 4 ply sheet, alumacoat, prime parapet walls, mop base sheet to walls, mop fiberglass granulated cap sheet to walls, install metal coping cap.
Breakdown: Building “A”     Structural Deck Repair:* 200 Squares @ 310.00/Sq. 62,000.00 Roofing Insulated 200 Squares @ 346.00/Sq. 69,200.00 Building "B"     Structural Deck Repair* 89 Squares@ 310.00/Sq. 27,590.00 Roofing 89 Squares@ 310.00/Sq. 27,590.00 Building "C"     Roofing 135 Squares@ 115.50/Sq. 15,592.50 Building "F"     Roofing 58 Squares@ 226.00/Sq. 13,108.00 Building "G"     Building "H"-"I"-"J"     Roofing 24 Squares@ 115.50/Sq. 29,297.50 Building "K"     Roofing 101 Squares@ 115.50/Sq. 11,665.50 Building "L"     Roofing 67 Squares@ 235.00/Sq. 15,745.00
To avoid steel  deck replacement consideration may be given to the removal of all roofing. Mechanical attachment of the base sheet to the gypsum with a time allowance to dry the gypsum, moisture will escape at the laps of the base sheet. Mop installation of isocyanurate insulation, mop installation of ½” perlite as a barrier board, 3 plies of type 4 fiberglass with an aluminum coating.  This installation will also require the installation of a pressure treated nailer at all perimeter locations.  However, subsequent failure of the steel deck and blistering of the new roof system due to the high moisture content of the gypsum may occur.  This installation would be approximately 380.00/Sq.. Throughout this report the word presumably is used, a core of a roof provides the specific characteristics of the roof system at that location, it does not indicate type style or frequency of fasteners or overall moisture content of the gypsum deck or the extent of the deterioration of the steel decking.  Prior to commencement of the work an asbestos survey should be performed.  All roof mounted air conditioning units will need to be raised, this cost has not been included in this report. If you wish to proceed with this work, we will provide a scope of work and specifications in concert with your Architects overall design package.  We can distribute this package to local roofing contractors. If you wish to move forward, we will prepare bid documents for local roofing contractors. If you require any additional information please feel free to call.   Sincerely, Tech e-Roof Solutions