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Common Structural Defficiencies

The document outlines common structural deficiencies in residential construction as per the Ontario Building Code (OBC) Part 9, including issues like cantilevered floors and tall basement walls, along with their remedies. It emphasizes the importance of lot-specific engineering for each house to address site-specific conditions and ensure safety. The presentation is led by Mike Baldinelli, a principal engineer, who advocates for professional engineer reviews to enhance reliability and transfer liability in residential projects.

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sullah
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27 views36 pages

Common Structural Defficiencies

The document outlines common structural deficiencies in residential construction as per the Ontario Building Code (OBC) Part 9, including issues like cantilevered floors and tall basement walls, along with their remedies. It emphasizes the importance of lot-specific engineering for each house to address site-specific conditions and ensure safety. The presentation is led by Mike Baldinelli, a principal engineer, who advocates for professional engineer reviews to enhance reliability and transfer liability in residential projects.

Uploaded by

sullah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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“Common Structural Deficiencies/Remedies

In Part 9 Residential Construction”

From: Mike Baldinelli, P.Eng, MESc, Principal


PRESENTATION TOPICS

 Strik, Baldinelli and Associates


• Who Are We?

 Ontario Building Code


• Part 9
• Part 4
• Engineers Role

 Common Structural Deficiencies and


Remedies

Our “beefs” with the industry


STRIK, BALDINELLI & ASSOCIATES
Principals: Mike Baldinelli, P.Eng and Aaron Strik, P.Eng

Offices in London and Cambridge

2006 & 2008, 20O9 Supplier of the Year– London Home


Builders Association (LHBA)

2010 –KWRHB-Supplier of the Year

2010 Finalist-London Chamber OF Commerce- Small


Business Category

President of the London Home Builders 2010-2011


STRIK, BALDINELLI & ASSOCIATES
 STAFFING: 14 Engineers and Designers
 Fully Certified BCIN Firm
 Large/Complex Buildings, Small Buildings and
House

 Primary Focus:
Structural Engineering Focusing on
Residential and Commercial Buildings
with a Specialty on Large Multi-Level
Wood Buildings up to 4 levels.

 Last year we engineered over 1800


residences across Ontario & 6 large wood
structures (30-50 thousand sq ft)
ONTARIO BUILDING CODE

PART 9 “HOUSING AND SMALL BUILDINGS”


ONTARIO BUILDING CODE

PART 4 “STRUCTURAL DESIGN”


ONTARIO BUILDING CODE
 PART 9 of OBC:

Provides charts, tables and basic guidelines


for the design of Part 9 type structures.
These items can be specified by A Certified
BCIN Designer.

Examples:

Tall Stud Wall Chart (now in 2006 code)


Steel Beam and Wood Lintel Sizes
Strip/Pad Footing Sizes (limited)
Brick/Wood Lintel Designs (limited)
ICF type walls (now in 2006 code)
Part 9
Building by
Definition
Part 9 OBC
Steel Beam
Chart
Engineers Role

 We work primarily for the Builder, Owner or


Residential Designer.

 We provide information in 3 main forms:

 Stamped drawings for specific Part 4 Items


 Stamped letter/details for specific Part 4
Items
 Site Inspections upon request

 Engineer requests differ from city to city,


Currently there is no “standard”, the same
house in one city may not require engineering
In another (example)
9’-3” span
COMMON STRUCTURAL
DEFICIENCES/REMEDIES
 Cantilever floor over brick
 Tall Basement Walls
 Half Wall Guards
 Laterally unsupported foundation walls
 Reinforced oversized concrete windows
 Large brick lintel supports
 Rolled brick angles
 Steel Beam to Beam connections
 Beams supporting brick
 Suspended Concrete Slabs (now in code)
 Box Beam at Tall Wall @ stairs
 Underpinning of Ex. Walls
 Lot Specific Engineering Seals or Letters
Residential
Design
Check List
Cantilevered
Floor over
Brick

OBC Code Ref:

9.23.9.9
Tall Basement
Wall

OBC Code Ref:

9.15.4
Table 9.15.4.2.A
Tall Basement
Wall

OBC Code Ref:

9.15.4
Table 9.15.4.2.A
Half Wall
Guard
OBC SB-7
Interior Half
Wall Guard

OBC Code Ref:

SB-7
ID-1
Foundation
Wall- Laterally
Supported

OBC Code Ref:

9.15.4
Table 9.15.4.2.A
Laterally
Unsupported
Wall

OBC Code Ref:

9.15.4
Table 9.15.4.2.A
Laterally
Unsupported
Wall

OBC Code Ref:

9.15.4
Table 9.15.4.2.A
Oversized
Basement
Window

OBC Code Ref:

9.15.4.2
Garage Brick
Lintel
Rolled Brick
Arches

OBC Code Ref:

9.20.5
Steel Beam
To Beam
Connections

OBC Code Ref:

No code ref
Suspended OBC Code Ref: 9.40
Concrete Slab
Non-
Continuous
Tall Wall
(at stairs)

OBC Code Ref:

9.23.10
Table 9.23.10.1
Table A-30-31
Underpinning
Of Existing
Basement
Walls

OBC Code Ref:

No code ref
Lot Specific Engineering

 In our opinion, each and every house should have lot


specific engineering, regardless if it’s the same model
or house type

WHY????
Professional Engineers of Ontario Require It

Engineers Liability won’t cover Issues if They arise

Site Conditions Change


Lot Grading
Truss Layout Can Change
Changes to Drawings without us Knowing
Snow Loading (different from city to city)
THE ULTIMATE REMEDY
“PROFESSIONAL ENGINEER REVIEW”

 Safe, Reliable Dwelling

 Transfer of Liability from City, Municipality and


Owner to Engineer

 Marketing Advantages-Well Engineered House

 Costs can be built into project, average engineering


costs are 0.1-0.2% of house construction cost.

 A Reality for the future of Residential Construction


“Common Structural Deficiencies/Remedies
In Part 9 Residential Construction”

From: Mike Baldinelli, P.Eng, MESc, Principal

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