BL4 Roof Information.pdf
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- Solicitation number
- 47PH0220R0017
About this file
This document outlines full maintenance services requirements for several federal buildings in Texas. The General Services Administration Public Buildings Service seeks a contractor to provide operation and maintenance, custodial, and ground maintenance services. Required services include building maintenance and upkeep for nine federal facilities in Houston, Beaumont, and Galveston housing various agencies including the U.S. Customs House, Bob Casey Courthouse, Alliance Tower, La Branch Federal Building, Mickey Leland Federal Building and Parking Garage, Galveston U.S. Courthouse/U.S. Post Office, FBI Office Building, FBI Guard House, FBI Parking Garage, and Jack Brooks Federal Building. The anticipated period of performance is from May 2021 onwards. This procurement is reserved exclusively for Service-Disabled Veteran-Owned Small Businesses.
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BL4: Roof Information
● TX0019 - Jack Brooks Cths/PO o Main Building (Original Structure)
▪ Low-Slope
▪ Modified bitumen over tongue-and-groove deck over wood structure.
▪ Insulation friction fitted and tacked into place at underside of deck.
▪ Low-slope roof transitions to steep-slope roof.
▪ Steep-Slope
▪ Clay tile over felt underlayment.
▪ On the front elevation of the building, the clay tile roof transitions to two small, low-slope copper roofs that cover portions of the building that “bump out”.
▪ Bump Out
▪ Copper roofing system slopes to gutters and downspouts that are routed thru the interior.
o Third Level Roof (over elevator penthouse)
▪ Modified bitumen roofing system.
o Two-Story Addition (‘U’-Shaped)
▪ Added in 1965.
▪ Main Roof
▪ Modified bitumen roofing system over deck (deck material unknown).
Assuming same as original structure.
▪ Overflow scuppers installed through the parapet wall on east elevation.
▪ Two expansions joints running east to west covered with stainless steel covers.
▪ Lower Roof
▪ Same as main roof.
▪ Expansion joint runs north to south along the back elevation of the original structure.
▪ Canopy Roof
▪ Probably was installed as loading dock cover but is now enclosed and used as office space.
▪ Ballasted, built-up roofing system.
● TX0081- Galveston Cths/PO
▪ Main Roof
▪ Clay tile roof over concrete deck into a copper gutter system.
▪ Copper gutter system has been repaired with gutter liners and a coating system.
▪ Low-slope roof is coated with an unknown coating system.
▪ Miscellaneous Roofs
▪ SBS modified bitumen roofing system (2-ply) over 1/2” cover board over multiple layers of polyiso insulation and tapered insulation over concrete roof deck.
▪ Sopraflam 180 (Base-Ply)
▪ Sopralene 180 FR GR (Cap Sheet)
▪ Roofing system drains to roof drains.
● TX0101- Houston US Customs House o Original Building
▪ Main Roof
▪ Standing seam metal roofing system over concrete roof deck.
▪ Drains to a trough-style gutter system coated with modified bitumen membrane.
▪ Mechanical Penthouses
▪ Standing seam metal roofing system over concrete roof deck.
▪ Elevator Penthouse
▪ Modified bitumen roofing system with a white acrylic coating over concrete roof deck.
o Towers
▪ Modified bitumen roofing system with a white acrylic coating over concrete roof deck.
▪ Water discharged thru internal roof drains.
▪ Mansard roof were added in 1963 and cover the original façade at the fourth floor level. Mansard roofs exist on three elevations and drain to copper-lined gutter troughs. The drainage trough is portion of the original drainage system constructed in 1935 which included an integrated stone gutter at the exterior apron, below the balustrades. The orginial stone getter has been capped with metal coping.
o Third Level Roofs
▪ Added in 1932 renovation project.
▪ Located behind the original structure.
▪ Modified bitumen roofing system with a white acrylic coating over concrete roof deck (assuming).
o First Level Roofs
▪ Added in 1932 renovation project.
▪ Modified bitumen roofing system with a white acrylic coating over concrete roof deck (assuming).
o Canopy and Freight Elevator Roofs
▪ Canopy covers the loading dock on the southeast side of the building.
▪ Both roofs have a modified bitumen roofing system with a white acrylic coating over concrete roof deck.
▪ Internal roof drains discharge water from the canopy.
o Walkway
▪ Modified bitumen roofing system with a white acrylic coating over concrete roof deck.
▪ Rainwater discharged via thru-wall scuppers and metal conductor head/downspout system.
● TX0211- Bob Casey Cths o Design documents indicated a modified bitumen cap sheet over 4-ply membrane roofing system over 3/4" perlite over tapered polyiso insulation over concrete roof deck. **Present of cap sheet over 4-ply membrane roofing system has not been verified.** o Design documents also indicate a batten-lok standing seam metal roofing system over flexible retarder over concrete roof deck is present.
o Firestone roofing system installed in 2003 & 2011.
o Rainwater discharge via internal roof drains.
o Thru-wall overflow scuppers are present along the shellstone panels.
o Parapet wall consists of double-wide, unsupported brick, enclosed with metal
R-panels on the backside and shellstone on the exterior side with metal coping.
o Lightning protection is installed.
● TX0297- Alliance Tower FB o SBS modified bitumen roofing system (2-ply) over 1/2” cover board over 1-
1/2” polyiso insulation and tapered insulation over concrete roof deck.
o Johns Manville roofing system installed in 2010.
▪ Membrane Spec. and Type: 2FID-CR-HW.
▪ Insulation Type: NRG3, DuraBoard.
o Rainwater discharged via internal roof drains.
● TX0298 - GT Leland FB o Main Structure
▪ Single-ply roofing system over polyiso insulation and tapered insulation over concrete roof deck.
▪ Rainwater discharged via internal roof drains.
▪ Secondary overflow roof drains are present.
o Rotunda and Pedestrian Connector
▪ Design documents indicate a structural standing seam metal roofing system over purlins and a single-ply roofing system.
▪ Currently, a green roofing system installed.
● TX0435 - FBI Building o Roof Type A, B & C: TPO roofing system over cover board over polyiso insulation over concrete roof deck.
o Roof Type D: TPO roofing system over cover board over polyiso insulation over fire barrier over metal roof deck.
● TX0436 - FBI Guard House o Standing seam metal roofing system over fabric underlayment over exterior grade plywood over polyiso insulation over gypsum thermal barrier over metal roof deck.
o Continuous gutter lined with an elastomeric membrane gutter liner.
● TX0701 - LaBranch FB o GAFGLAS built-up roofing system over cover board over polyiso insulation and tapered insulation over lightweight concrete roof deck.
o GAF roofing system installed in 2011.
▪ Membrane Spec. and Type: I02TGPFREC.
o Rainwater discharged via internal roof drains.
File details come from the government source that posted it. Updated .