Condo Media - April 2010 - (Page 40)

MAINTENANCE by Michael Norman Solid Upkeep oncrete is among the most durable building materials available. However, concrete can deteriorate if it is not applied and maintained properly especially in New England’s ever-changing weather conditions. Care and Maintenance of Concrete Structures another are usually a clue that the reinforcing cage may be improperly positioned. Premature removal of shoring may cause excessive deflection in beams. Deflection can cause distorted window frames, problems with window spalls, or popouts, may occur at edges where bar ends terminate near the concrete surface or at other localized areas of shallow concrete cover. Spalling also can be promoted when electrical conduit is placed too close to the surface. Larger spalls may occur near embedments and where long sections of reinforcing steel, with insufficient cover, run parallel to the concrete surface. For example, in a recent restoration at Primus Court Condominiums in Boston’s historic Beacon Hill section, Abbot found that the concrete band over street floor windows was severely deteriorated. In the process of renovating the concrete band, a structural steel beam was exposed and determined to be in need of repair. The steel beam was repaired and a new concrete surface was applied to match its original color and texture in compliance with the Beacon Hill Architectural Commission. Delaminations are areas where the concrete has lost bond with the reinforcing steel. The resulting planar cracks that run parallel to the surface are due to corrosion of rebar near the top surface or below embedments. Delaminations can be detected by tapping the concrete with a hammer. A hollow sound indicates a delaminated area. Spalls and delaminations on the building facade may be only warnings of more extensive structural damage extending into the building. Repairs inside the building are more expensive, often requiring shoring and bracing of windows or walls, and protection of interior spaces from dust and weather. C Concrete Deterioration Concrete deterioration is typically caused by one or more of the following conditions: Poor Quality Materials. Poor quality concrete may manifest itself when the ingredients of the mix are improperly calculated. To determine concrete quality, core samples should be taken from various locations for evaluation. It is a good idea to take core samples from both deteriorated areas and those that appear to be undamaged. Differences in the concrete may provide clues to the reason for the deterioration. Knowing the quality of the concrete can provide an indication of the expected life of the building, and it can help the owner plan and budget immediate and future repairs. Construction and Design Errors. Construction errors occur when what is actually built deviates from the original specifications or prevailing standards. Although construction defects typically can’t be completely corrected, efforts must be made to alleviate their detrimental effects. Insufficient concrete cover over the reinforcing bars is among the most common construction errors. This condition is often revealed by rust stains on spandrels or columns. Misaligned columns from one level to 40 CONDO MEDIA • APRIL 2010 Cross section of structurally built concrete column with reinforcing steel rods. seals and cracked masonry. Honeycombing or segregation of the aggregate results from concrete placement problems in small or substantially reinforced columns. Design errors occur when mistakes are made in the original specification. Design errors also may include an absence of drip edges at the underside of the slab, or expansion and control joints that are spaced too far apart. Spalling and Delamination. Spalls and delaminations are usually the result of internal pressure caused by corroding reinforcing steel. Spalls are areas where concrete has broken away from the wall. Small

Table of Contents for the Digital Edition of Condo Media - April 2010

Condo Media - April 2010
Table of Contents
From the CED’s Desk
President’s Message
CAI News
CAI Regional News
Asked & Answered
Homeowner’s Corner
Risk Management
Insurance
Management
Rising Fears
Vendor Spotlight
Maintenance
Industry Perspective
CAI National Law Conference Was Tops … Now for the Bottom Line
.2010 CAI-NE Insurance & Restoration Directory
Advertisers Index
Classified Service Directory

Condo Media - April 2010

https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202010
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202009
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202008
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202007
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202006
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202005
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202004
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202003
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202002
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_202001
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201912
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201911
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201911_v2
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201910
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201909
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201908
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201907
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201906
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201905
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201904
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201903
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201902
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201901
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201812
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201811
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201810
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201809
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201808
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201807
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201806
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201805
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201804
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201803
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201802
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201801
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201712
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201711
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201710
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201709
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201708
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201707
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201706
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201705
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201704
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201703
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201702
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201701
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201612
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201611
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201610
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201609
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201608
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201607
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201606
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201605
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201604
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201603
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201602
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201601
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201512
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201511
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201510
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201509
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201508
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201507
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201506
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201505
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201504
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201503
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201502
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201501
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201412
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201411
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201410
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201409
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201408
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201407
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201406
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201405
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201404
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201403
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201402
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201401
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201312
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201311
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201310
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201309
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201308
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201307
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201306
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201305
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201304
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201303
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201302
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201301
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201212
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201211
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201210
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201209
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201208
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201207
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201206
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201205
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201204
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201203
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201202
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201201
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201112
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201111
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201110
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201109
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201108
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201107
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201106
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201105
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201104
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201103
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201102
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201101
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201012
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201011
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201010
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201009
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201008
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201007
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201006
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201005
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200904
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201003
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201002
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_201001
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200912
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200911
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200910
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200909
https://www.nxtbook.com/nxtbooks/mcneill/condomedia_200908
https://www.nxtbookmedia.com