Lanham_Roof_Restoration_15__Site_Investigation_Submittal_SURVEY_REPORT.pdf

LANHAM FEDERAL OFFICE BUILDING

819 Taylor Street Fort Worth, Texas Roof Report

September 23, 2016 WJE No. 2016.2751

Prepared for:

Mr. David Shively VAI Architects Inc.

16000 North Dallas Parkway, Suite 200 Dallas, Texas 75248

Prepared by:

Wiss, Janney, Elstner Associates, Inc.

6363 N. State Highway 161, Suite 550 Irving, Texas 75038

972.550.7777 tel | 972.550.7770 fax

Fort Worth, Texas

Bill Burger, AIA Principal

September 23, 2016 WJE No. 2016.2751

Prepared for:

Mr. David Shively VAI Architects Inc.

16000 North Dallas Parkway, Suite 200 Dallas, Texas 75248

Prepared by:

Wiss, Janney, Elstner Associates, Inc.

6363 N. State Highway 161, Suite 550 Irving, Texas 75038

972.550.7777 tel | 972.550.7770 fax

TABLE OF CONTENTS

Background & General Roof Area & Roof System Information Roof Area A Assessment Roof Area B Assessment Roof Area C Assessment Roof Area DAssessment Roof Area E Assessment Code Excerpts Overall Roof Assessment

Fort Worth, Texas Roof Report

ROOF ASSESSMENT

Background

The Fritz G. Lanham Federal Office Building, located at 819 Taylor Street in Fort Worth, Texas, is named after Fritz Garland Lanham, a U.S. Representative from Texas. Constructed in 1966, the Lanham Federal Office Building currently houses agencies such as the Social Security Administration, Internal Revenue Service, National Weather Service, and National Labor Relations Board.

The building has five distinct low slope roof areas, designated in this report as Roof A, B, C, D, and E. The roof structures consist of concrete roof decks. The building has two different type roofing systems; aggregate surfaced built up roofing systems and granular surfaced modified bitumen built up roofing systems. A roof plan and photos of existing conditions are included in the report to assist you in understanding the items described within.

General Roof Areas & Roof System Information

Roof Section Sq. Ft. Roof Type

A Built-up Roof with Modified Bitumen Capsheet B Built-up Roof with Modified Bitumen Capsheet C Built-up Roof with Modified Bitumen Capsheet D Built-up Roof with Aggregate Surface E Built-up Roof with Aggregate Surface

ROOF A

R O

O F

B

O

O

C

O

D

O

E

N

Roof A (Upper Main Roof) Observations

Roof A - Existing Assembly

Asphalt built-up roof with white granule cap sheet 1/8 inch per foot tapered perlite insulation Concrete deck

The roof slopes toward a series of interior roof drains The roof area does not have overflow drains or scuppers

The base flashings turn up walls and are counter flashed with surface mount type flashing

Mechanical units on this roof area have with low curb heights and an old cap at a duct penetration that should be replaced

Roof A has an air conditioner condenser unit that is setting on pavers. GSA personnel indicated that they do not want equipment on roof. We recommend that new equipment curbs be installed.

Satellite dishes on weighted skids on surface of existing roof. GSA personnel indicated that they do not want equipment of roof. We recommend that new equipment curbs or steel posts be installed.

Solar arrays are located on the surface of roof. GSA personnel indicated that they do not want equipment of roof. We recommend that new equipment curbs or steel posts be installed.

Louvers on south wall of penthouse. Temporary removal may be necessary to install new roofing.

Roof A - Recommended New Roof Assembly

A minimum of R-20 of polyisocyanurate insulation (attached with foam) A minimum of 1/8 inch per foot tapered insulation (attached with foam) 1/2 inch thick cover board (DensDeck or Securock) (attached with foam) 3-ply modified bitumen membrane - 2 base sheets and 1 cap sheet (in cold adhesive)

Roof B (Penthouse)

Roof B - Existing Roofing Assembly

Asphalt built-up roof with white granule cap sheet

Base flashing turns up walls and is counter flashed with surface mount type flashing

There are three dog houses on the roof that have windows and louvers. The metal counter flashing at the perimeter appears to have lifted at some point in time for roof replacement or repairs and should be replaced. The metal roof cap should also be replaced. Disassembly of the dog houses will be necessary.

Some of the equipment may be abandoned. GSA to verify.

Roofs vent need to have new metal counter flashing installed around duct.

Roof B - Recommended New Roof Assembly

A minimum of R-20 of polyisocyanurate insulation (attached with foam) A minimum of 1/8 inch per foot tapered insulation (attached with foam) 1/2 inch thick cover board (DensDeck or Securock) (attached with foam)

Roof C (Cooling Tower)

Existing Roofing Assembly

Asphalt built-up roof with white granule cap sheet 1/8 inch per foot perlite tapered insulation

Several of the chiller pipes were low.

An area of wrinkled cap sheet was observed at the east end of the roof. Possible ponding water issue.

Roof C - Recommended New Roof Assembly

A minimum of R-20 of polyisocyanurate insulation (attached with foam) A minimum of 1/8 inch per foot tapered insulation (attached with foam) 1/2 inch thick cover board (DensDeck or Securock) (attached with foam) 3-ply modified bitumen membrane - 2 base sheets and 1 cap sheet (in cold adhesive) New concrete paver walkway.

Roof D (7th Floor South)

Existing Roofing Assembly

Asphalt built-up roof with aggregate surface

There are two dog houses on the roof with louvers. The metal counter flashing at the perimeter appears to have been lifted at some point in time for roof replacement or repairs and should be replaced. The dog house roof consists of gravel surfaced BUR over tapered insulation over concrete with metal pan.

Some abandoned curbs and supports will need to be removed.

Penetration flashing is inappropriate and should be replaced during reroofing.

Stairs for the roof access door are setting on the roof surface. We recommend that new equipment curbs or steel posts be installed.

Roof D - Recommended New Roof Assembly

Concrete deck A minimum of R-20 of polyisocyanurate insulation (attached with foam) A minimum of 1/8 inch per foot tapered insulation (attached with foam) 1/2 inch thick cover board (DensDeck or Securock) (attached with foam)

New concrete paver walkway at base of stairs.

Roof E (7th Floor North)

Existing Roofing Assembly

Asphalt built-up roof with gravel surface

There is one doghouse on the roof with louvers. The roof consist of gravel surfaced BUR over tapered insulation over concrete with metal pan.

Some abandoned curbs and supports will need to be removed.

Penetration flashing is inappropriate and should be replaced during reroofing.

Stairs for the roof access door are setting on the roof surface. We recommend that new equipment curbs or steel posts be installed.

Roof E - Recommended New Roof Assembly

A minimum of R-20 of polyisocyanurate insulation (attached with foam) A minimum of 1/8 inch per foot tapered insulation (attached with foam) 1/2 inch thick cover board (DensDeck or Securock) (attached with foam)

New concrete paver walkway at base of stairs.

Ft. Worth Code Amendments (from website)

Excerpt from Ft. Worth 2009 IECC and amendments.

Excerpt from Ft. Worth 2009 IBC Amendments

IBC SECTION 1507

*IBC Section 1507.10.1; add an exception to read as follows:

Exception: Engineered roofs designed to provide adequate drainage after the long-time deflection from dead loads or designed to support maximum loads, including possible ponding of water from any source, including snow, due to deflection, may have a design slope of a minimum of one-eighth unit vertical in 12 units horizontal (1-percent slope).

IBC SECTION 1510

*IBC Section 1510.1.1; added to read as follows:

1510.1.1 Permit required. Roofing shall not occur, nor shall replacement roofing be applied without first obtaining a permit when required by Section 105.

*IBC Sections 1510.7, 1510.8 and 1510.9; added to read as follows:

1510.7 Maintain existing provisions. When reroofing, or repairing existing roofing, the installer is required to insure the following items are maintained:

1. Existing roof drains and drainage systems are maintained clear an unobstructed. When in the opinion of the Building Official the existing drainage system appears inadequate, the system shall be re-evaluated and when necessary required to comply with the provisions for new construction.

Fire-retardant requirements are maintained.

End of Report