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Home My WebLink About2017-3 opt Structural OBS Report APRIL 26 2017_.pdfKHATRI INTERNATIONAL, INC. Page 1 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Structural Observation Report Memorandum 2017-3 CLIENT: YVETTE MARIE ALLEN, CMCAR CERTIFIED COMMUNITY MANAGER DIAMOND BAR VILLAGE ASSOCIATION Property Address: DIAMOND BAR VILLAGE HOA 1850 S DIAMOND BAR BLVD, DIAMOND BAR, CA 91765 Date of Structural Observation: April 26, 2017 1.0 SCOPE OF WORK: This Report is a follow up on the Field Investigation performed on March 22, 2017, to determine the extent of Termite, Dry Rot, and structural damage to the different buildings at this project. At the March site inspection, certain areas were exposed for further investigation and this Report provides conclusions based on that follow up Report. KHATRI INTERNATIONAL, INC. Page 2 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ 2.0 FIELD OBSERVATIONS All 12 Buildings are typical in structural design and construction. They are designed as Type V Wood Frame Two Story with roof rafters and flexible diaphragms in the 1970s-80s construction. Over several decades there has been an accumulation of water damage, termite infestation, dry rot, and long term wear and tear on the Roofs with infestation damage leading into the structural walls. Photographs in this Report (Memorandum 2017-3; 6/15/17) and the previous Report (Memorandum 2017-2; 3/26/17) provide field notes that apply to all of the buildings. In summary these notes are: 2.1 The Roof Rafters are severely to critically damaged due to long term water/termite/dry rot damage. They will have to replaced along with the plywood sheathing. 2.2 Moisture damage does extend from the Roof Rafter line into the 2nd Story Walls down to/near approximately the 2nd Story Floor Line. This is noted on several photographs wherein these walls were exposed to show the existing conditions of the studs. The damage is extensive and some of these Walls will have to be reconstructed with new lumber. 2.3 The Balcony Beams are in good condition and do not require replacement. The edge Facia Beams are extensively damaged and should be replaced. Although the edge Facia Beams are not KHATRI INTERNATIONAL, INC. Page 3 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ structural and not load bearing, it is advised that these edge members should be replaced to avoid further spreading of termite/dry rot damage to the remaining healthy structural members in the Balcony and Second Floor Joists. 2.4 The Balcony Decks should be replaced with new decking material and waterproofing. 2.5 The Parapet of one of the Buildings will require to be replaced with a new connection to the existing Building. 2.6 Certain Buildings have potential Foundation cracking/damage that will require further investigation with exploratory Destructive Testing to expose their footings. This will be concluded on further site investigations. KHATRI INTERNATIONAL, INC. Page 4 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ 3.0 CONCLUSIONS & RECOMMENDATIONS 3.1 All Balcony Decks should be removed of permanent loading such as equipment, furniture, potted plants, AC Units, and any Dead Loads that create overloading to the Balcony Beams. Balcony Decks are not designed as permanent storage areas and should be vacated from all these extraneous loads that result in structural problems. 3.2 The Roof Rafters, Roof Sheathing, and all of the existing Spanish Tile will have to be removed and replaced with new materials. This will have to be done on all 12 Buildings at the Project. This will require a structural Roof Plan with site observation from the Structural Engineer and Deputy Inspection to assure the Roof Structures are restored to their proper structural integrity. 3.3 Second Story Walls that are termite damaged will require full reconstruction from the second story plate line. This will have to be done on all 12 Buildings at the Project. This will require a structural Wall Reconstruction Plan with site observation from the Structural Engineer and Deputy Inspection to assure the structure is restored to their proper structural integrity. 3.4 Further investigation on the Foundation cracking is necessary on certain buildings and shall be followed up with a separate Report. KHATRI INTERNATIONAL, INC. Page 5 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ 3.5 The Parapet will require a Structural Repair/Replacement Plan to reattach a new Parapet to the existing Building. 3.6 All Parking Shed structures shall be removed with a Demolition Permit, as they are not in code compliance and pose a safety hazard. 3.7 The next step is to prepare a Reconstruction Plan and obtain Permits through the local building department to address these areas. All work shall be done with approved Plans and Permits and a licensed Contractor. 3.8 The Buildings have extensive damage but do not pose an immediate life safety threat, at the time of this inspection. The owners are urged to address these damaged areas promptly to avoid further risk to the occupants. KHATRI INTERNATIONAL, INC. Page 6 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ 4.0 Limitations and Disclaimer The scope of this investigation consists of a physical examination of the subject building for the structural condition, as -built condition, working service life, and recent distress. This report does not warrant, guarantee, or certify the future performance of the building for future conditions against earthquakes, landslide, soil subsidence, water leakage, and any other unforeseen circumstances. Hidden conditions, lack of knowledge of existing material strengths, maintenance issues, weather conditions, and other unknown factors can affect the performance of buildings and are difficult to predict. This report is based on the professional standards of the industry utilizing the available tools, visual observation, and data noted in this report. No warranties are provided either expressed or implied. Thank you for working with Khatri International. Respectfully Yours, Dilip Khatri, PhD, SE Principal Khatri International Inc. KHATRI INTERNATIONAL, INC. Page 7 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 1: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Balcony Supporting Beam. KHATRI INTERNATIONAL, INC. Page 8 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 2: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 9 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 3: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 10 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 4: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 11 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 5: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 12 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 6: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 13 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 7: Wall Damage is exposed to show Termite and Dry Rot Infestation. KHATRI INTERNATIONAL, INC. Page 14 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 8: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage is inside the Wall and the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 15 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 9: Wall Damage is exposed to show Termite and Dry Rot Infestation. This shows the extent of the damage to the Roof Rafters. KHATRI INTERNATIONAL, INC. Page 16 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 10: Balcony supporting Beams are in Good Condition and can remain. The edge FACIA Beam should be replaced, but the Balcony Beams are okay. KHATRI INTERNATIONAL, INC. Page 17 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 11: Balcony supporting Beams are in Good Condition and can remain. The edge FACIA Beam should be replaced, but the Balcony Beams are okay. KHATRI INTERNATIONAL, INC. Page 18 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 12: Balcony supporting Beams are in Good Condition and can remain. The edge FACIA Beam should be replaced, but the Balcony Beams are okay. KHATRI INTERNATIONAL, INC. Page 19 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 13: Balcony supporting Beams are in Good Condition and can remain. The edge FACIA Beam should be replaced, but the Balcony Beams are okay. KHATRI INTERNATIONAL, INC. Page 20 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 14: Roof Rafters and plywood sheathing will have to be replaced. Some areas of the 2nd Story Walls will have to be reconstructed due to the extent of the Termite/Dry Rot infestation. KHATRI INTERNATIONAL, INC. Page 21 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 15: Leaning area along the Parapet requires the Parapet will need replacement with a new connected structure. KHATRI INTERNATIONAL, INC. Page 22 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 16: Leaning area along the Parapet requires the Parapet will need replacement with a new connected structure. KHATRI INTERNATIONAL, INC. Page 23 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 17: Leaning area along the Parapet requires the Parapet will need replacement with a new connected structure. KHATRI INTERNATIONAL, INC. Page 24 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 18: Extensive Roof Rafter damage from dry-rot and termite damage. KHATRI INTERNATIONAL, INC. Page 25 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 19: Balcony Beams are in good condition. KHATRI INTERNATIONAL, INC. Page 26 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 20: Extensive Roof Rafter damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 27 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 21: Interior of 2nd Floor shows FJ are in Good condition, no structural repair/replacement necessary. KHATRI INTERNATIONAL, INC. Page 28 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 22: Interior of 2nd Floor shows FJ are in Good condition, no structural repair/replacement necessary. KHATRI INTERNATIONAL, INC. Page 29 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 23: Interior of 2nd Floor shows FJ are in Good condition, no structural repair/replacement necessary. KHATRI INTERNATIONAL, INC. Page 30 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 24: Extensive Roof Rafter damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 31 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 25: Extensive Roof Rafter damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 32 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 26: Extensive Roof Rafter damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 33 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 27: Extensive Wall damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 34 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 28: Extensive Wall damage from dry rot and termite damage KHATRI INTERNATIONAL, INC. Page 35 of 35 STRUCTURAL & CIVIL ENGINEERS Diamond Bar Village HOA R.C.E. # 40833, SE #4391, GENERAL CONTRACTOR #B555505 June 15, 2017 3579 E. Foothill Blvd., #736 Pasadena, CA 91107 www.khatrinternational.com , dkhatri@aol.com Tel. (626) 351-4830 ____________________________________________________________________________________________ Figure 29: Extensive Wall damage from dry rot and termite damage