FORD CONSERVATION CENTER

- MASONRY REPAIR PROJECT

Omaha, Nebraska ( Existing building )

The Ford Conservation Center in Omaha, Nebraska, built in 1995 is a historic building that suffers due to structural inability to control moisture transmission through exterior walls and ceiling. Constant damp surfaces were causing damage to masonry brick veneer and mortar joints. And, Efflorescence formed ugly white patches.

In an attempt to restore the structure, a maintenance plan was proposed. This included: 1) Removal of the 3 striking age old chimneys, 2)Relocation of the entire exhaust system that is within the chimneys, into the laboratories, and 3) Re-pointing the facade. This also involved research, and design support from the mechanical engineers to relocate the exhaust system.

Tasks accomplished:

1. Coordinated with mechanical engineer.

2. Produced construction drawing set.

3. Created 3D visuals for the maintenance proposal.

4. Researched on problematic areas causing moisture intrusion.

Project Highlights

Exhaust Fan relocation inside the laboratory

Documentation of existing interiors of the laboratories for providing base drawings to the mechanical team

Exhaust Fan within acoustic enclosure

Exterior Facade Treatment:

The exterior mortar joints on all facades, Brick Veneer Control Joints (VCJ) and Through wall Control Joints (TCJ), are required to be re-pointed in order to restore the facade.

Chimney demolition and fan relocation:

The demolition of chimneys was proposed along with relocating the fan into the labs. This will introduce a new wall with high performance moisture and vapor barrier at the North facade post demolition. Additionally an acoustic enclosure must be designed to encompass the re-located mechanical system inside the labs, which would otherwise remain exposed, creating noise pollution inside the labs.

TASK 4: CONSTRUCTION DOCUMENTS

Downspout & Gutter Sizing Reports

Project Name: Ford Conservation Center, Omaha

Rainfall Intensity (in/hr): 7.4

Based on rainfall averages in Omaha, NEBRASKA (10 years)

Roof Rainfall Design Area (ft²): 16,286.50

* Area of Largest Roof Serving a Single Gutter System

Design Area manually entered by user

Gutter in Lineal Ft: 664

* Length at Largest Roof Serving a Single Gutter System

Gutter Length Serving Single DS (ft.): 37

*Assumption: downspouts are equally spaced

**Maximum gutter length to be served by a downspout is 50ft per SMACNA ASMM

M (depth to width ratio): 0.75

Min. Gutter Width (in.): 6 [Rectangular]

Min. Gutter Depth (in.): 4.5

# of Downspouts: 18

Additional Downspouts: 4

*to reduce size of gutter and downspouts additional downspouts can be added

Min. Area per DS (in²): 5.66

Min. DS Size (in): 3 [Plain Round]

*Per Table 1-3 on page 1.4 of SMACNA ASMM

Roof gutter inefficiency:

Research was performed to determine whether the existing roof gutter meets the size requirements as per the SMACNA gutter sizing based on the roof area and volume of the annual rainfall that Nebraska receives. This clearly showed the existing gutter was undersized, proving its inefficiency in rain water drainage, adding to the problem.

16 OZ LEAD COATED COPPER COUNTER FLASHING

16 OZ LEAD COATED COPPER CRICKET FLASHING EXISTING ROOF DECK

General Notes

1. EXISTING DOCUMENTATION INDICATE THE STONE PANELS ARE MOUNTED ON STEEL SUPPORT FRAMES. CONTRACTOR TO CAREFULLY REMOVE STRUCTURE BELOW THE STONE PANELS WHICH ARE INDICATED AS "TO REMAIN" TO CONFIRM EXISTENCE OF SUPPORT STRUCTURE. NOTIFY ARCHITECT IF PANELS ARE UNSUPPORTED

HSS 6x3x1/4" SPANNING BTW EXISTING ROOF BEAMS (SEE HSS CONNECTION DETAIL 3 ON THIS SHEET)

DRILL TUBES FOR THREADED RODS TO PASS THROUGH; PROVIDE NUT & WASHER @ T.O. TUBE-TYP

ACOUSTIC

HSS 3x3x1/4" SPANNING BTW EXISTING ROOF BEAMS (SEE HSS CONNECTION DETAIL 3 ON THIS SHEET)

MIN 6" EMBED