214_Proposed_Solution_Report_B861-2018-03-13.pdf

SCOTT AIR FORCE BASE

TERMITE DAMAGE / STRUCTURAL INTEGRITY ASSESSMENT B861

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08/29/11 K:\SAFB\BV\170021-0004 SAFB Termite Damage\01 Administration\09 Reports\Basis of Design\B861\2018-03-13 Final Report\214_Proposed Solution Report B861-2018-03-13.docx

PROPOSED SOLUTION REPORT

On Tuesday, January 23, 2018, representatives of Kuhlmann design Group, Inc.

performed a site visit to Building 861 located on Scott Air Force Base with the intent to observe the structural framing and architectural composition of the building structure, assess known instances of existing termite and water damage, evaluate the structural integrity of the building as a result of this damage, and report the findings of this investigation and propose solutions to correct the damage. This Proposed Solution Report and Probable Cost summarize the corrections necessary to rebuild the structural integrity of the building based upon the existing construction and the scope of damage resulting from termite activity and other causes.

In order to perform the necessary repairs / replacement of the existing building structure, the exterior walls will require major demolition. Any existing light fixtures, ceiling tile pads, HVAC devices, fan coil units (FCUs), electrical / COMM equipment, office cubicles and furniture will be removed as required, stored during the repairs and re-installed in their original locations. An assessment of the condition of the above mentioned items was not part of this task. The use of conex boxes / trailers is recommended for short term storage.

Prior to any repair work, a termite control plan should be implemented for the building.

The program should include an inspection, treatment and follow up inspections by an exterminator to determine termite activity has stopped and is under control. Due to the extent of the termite damage in the building, the entire footprint of the building should be treated to halt current termite activity, and ensure that future activity is prevented so as to protect the repaired building framing.

BUILDING STRUCTURE

The area of Building 861 is approximately 42,200 square feet, and is comprised of a central building running from east to west on plan, as well as four pairs of “wings” that run plan north and south from this central building. These five areas are reflected in Appendix A Figure 1, which illustrates the overall floor plan of Building 861.

The building structure is a traditional post and beam framing system that utilizes heavy timber truss fabrications supported on timber columns to support roof loads and transfer these loads into the foundation. Wood framed walls infill between this post and beam framing and comprises the remainder building structure. The bottom of the roof trusses are clad with gypsum board with the attic protected by a dry suppression system.

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The framed walls rest on a 3x6 plate atop a continuous 6” concrete curb. The floor structure is constructed of a concrete slab on grade system, of thickness and reinforcing unknown due to the lack of original building drawings.

Overall these five principal areas comprise the entirety of Building 861, and were observed for past and present termite and water damage during the course of the site investigation. The solutions are as follows.

PROPOSED SOLUTIONS

Based on the findings of the site investigation and the damage outlined in the Post Investigation Analysis Report, water penetration and termite damage is prevalent throughout the exterior walls of the building. The exterior facade of the building will require replacement to stop the water penetration into the exterior walls. The removal of the exterior façade will also allow for a more detailed inspection of the wall framing for termite damage/activity. A summary of the repairs required in each area is as follows.

Exterior Façade Repairs Remove the existing faux brick, sheathing, batt insulation, all damaged sill plates and wood stud wall framing on all exterior walls. Removal of the existing windows or doors will be determined by the extent of damage to the window or door opening framing. The existing fan coil units may require removal if they block access to damaged wall framing.

Install new 3x6 pressure treated sill plates and new 2x6 framing at 24 o.c. in the place of damaged framing. Damaged window opening shall be reframed (See Appendix B).

Damaged door openings shall be reframed (See Appendix B). Provide new R19 kraft faced batt insulation in between the studs. The exterior finish will consist of the following: 5/8” glass matt gypsum board sheathing with a weather-resistive barrier (WRB) wrap covered buy a drainage mat. A polyurethane faux brick panel is applied using screws and adhesive. See Appendix C for more information on the faux brick panel and its installation. Sealant shall be applied around the perimeter of window / door frames and sills.

The condensate line for the FCUs shall be reworked to extend out of the exterior wall finish and turn down to a french drain (See Appendix E Figure 3). Provide new louvers for the fresh air intake for the FCUs.

The existing sheet metal guttering shall have the joints reworked to eliminate leaking.

Gutters should be lapped to match direction water flow and be sealed. Downspouts should be replaced to ensure against leaking. The existing splash blocks shall be reset to ensure water drains away from building and provide splash blocks at downspouts without one.

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All wood chips used in landscaping beds shall be removed and replaced with a decorative landscape rock. If the existing grade is within 8” of the faux brick finish it shall be reworked to provide the 8” clearance.

Interior Repairs When exterior wall framing requires replacement the interior gypsum board will need to be replaced with a mold / moisture gypsum board and the existing ceiling grid and tiles will be need to be reworked.

Once framing repairs have been performed, existing MEP systems and finishes shall be reinstalled to their original locations, with new components (conduit, pipe, seals, etc.)

utilized as necessary based on any discovered deterioration or damage resulting from the demolition process.

Prior to any repair work, a termite control plan should be implemented for the building.

The program should include an inspection, treatment and follow up inspections by an exterminator to determine termite activity has not impacted this area and is under control. The entire footprint of the building should be treated to halt current termite activity, and ensure that future activity is prevented so as to protect the repaired building framing.

CONCLUSIONS

On Tuesday, January 27, 2017, representatives of Kuhlmann design Group, Inc.

performed a site visit to Building 861 located on Scott Air Force Base with the intent to observe the structural framing and architectural composition of the building structure, assess known instances of existing termite and water damage, evaluate the structural integrity of the building as a result of this damage, and report the findings of this investigation. The Post Investigation Analysis Report summarized the observations and assessments made during the site visit.

This Proposed Solutions Report summarizes the repairs necessary to correct the damage caused by termites and water intrusion. In addition this report outlines the challenges in implementing the necessary repairs, with special consideration given to second and third order effects necessitated by the repairs.

Based on the findings of the site investigation and the damage outlined in the Post Investigation Analysis Report, water penetration and termite damage is prevalent throughout the exterior walls of the building. The exterior facade of the building should be rebuilt with a finish system that will prohibit moisture from entering the building. The gutters and downspouts should be reworked / replaced to stop water from washing the

4 0097-001 base of the exterior finish. Landscaping should be upgraded to eliminate termite attraction and grading reworked to keep termites and water from entering the building.

Prior to any repair work, a termite control plan should be implemented for the building.

The program should include an inspection, treatment and follow up inspections by an exterminator to determine termite activity has stopped and is under control. The treatment will ensure that future activity is prevented so as to protect the repaired building framing.

Without proper treatment and or repair, this termite activity appears likely to continue when conditions are favorable for termite activity (warmer temperatures and higher moisture levels in the spring and summer seasons). Continued activity will cause further degradation of the exterior wall structure.

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