Z240.10.1-16

Site preparation, foundation, and installation of buildings

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  Standards Update Service

  Z240.10.1-16

  December 2016

  
  

  Title: Site preparation, foundation, and installation of buildings

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Z240.10.1-16

Site preparation, foundation, and installation of buildings

Published in December 2016 by CSA Group A not-for-profit private sector organization

178 Rexdale Boulevard, Toronto, Ontario, Canada M9W 1R3

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ISBN 978-1-4883-0660-0

© 2016 CSA Group

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

Contents

Technical Committee on Factory Certification of Buildings 3

Preface 6

1. Scope 7

   1. Application 7

   2. Issues addressed 7

   3. Users 7

   4. Terminology 7

   5. Units of measure 8

1. Grading of excavated area 9

2. Granular fill and grading 9

3. Ground cover 10

1. Foundations 10

   1. General 10

      1. Compliance 10

      2. Location of foundation support points 10

   2. Clearance 10

      1. General 10

      2. Access to foundations and services 10

   3. Depth of foundations 11

   4. Piles 11

      1. Compliance 11

      2. Footings for piles 11

      3. Dimensions of reinforced concrete piles 11

      4. Frost protection of concrete and masonry piles 11

      5. Preservative treatment of wood piles 11

      6. Lateral restraint 12

   5. Footings for piers 12

      1. Compliance 12

      2. Bearing for piers 12

      3. Footing area 12

      4. Fill under footings 17

      5. Concrete footings for piers 18

      6. Wood footings for piers 18

   6. Piers 18

      
      

      6.6.1	Required footings for piers	18
      6.6.2	Dimensions of piers 18
      6.6.3	Lateral restraint 19
      6.6.4	Concrete masonry piers	19
      6.6.5	Wood-crib piers 19

      
      

2. Anchorage to resist overturning and pier toppling due to wind 20

   1. Rating 20

      1. Required rating 20

      2. Calculated resistance 20

   2. Required anchorage 21

   3. Pull-out resistance 21

      1. Minimum pull-out resistance 21

      2. Determination of pull-out resistance 21

   4. Anchorage adjustment 21

   5. Spacing 22

   6. Depth 22

   7. Deterioration resistance 22

      
      

3. Connection of modules in multiple-section prefabricated buildings 22

   1. Compliance 22

   2. Structural requirements 22

   3. Air barrier systems, vapour barriers, and insulation 22

   4. Weathertightness 22

      1. Roofing and flashing 22

      2. Sheathing membrane 22

      3. Siding 23

   5. Fire blocking of concealed spaces 23

      
      

4. Skirting 23

   1. Installation 23

   2. Ventilation of and access to crawl space 23

Annex A (informative) — Site preparation 24

Annex B (informative) — Foundations 25

Annex C (informative) — Anchorage systems 38 Annex D (informative) — Multiple-section units 43 Annex E (informative) — Skirting 46

Technical Committee on Factory Certification of Buildings

P.S. Aitchison Lethbridge, Alberta

Category: General Interest

Chair

K.D. Maynard Canadian Manufactured Housing Institute, Ottawa, Ontario

Category: Producer Interest

Vice-Chair

K. Adamson Quality Auditing Institute Ltd, Coquitlam, British Columbia

Associate

A. Al-Hussein University of Alberta, Edmonton, Alberta Category: General Interest

N. Belrechid National Research Council Canada, Ottawa, Ontario

Associate

W.E. Burningham W.E. Burningham & Associates,

Prescott, Ontario

Category: General Interest

A. Chase Ministry of Natural Gas Development & Minister Responsible for Housing,

Victoria, British Columbia

Category: Regulatory Authority

T. Chaudhry Town of Orangeville, Orangeville, Ontario

Associate

A. Chown Canadian Manufactured Housing Institute, Ottawa, Ontario

Associate

P. Cook Ministry of Government Relations, Regina, Saskatchewan

Category: Regulatory Authority

J.C. Einarson Whitehorse, Yukon

Category: General Interest

W. Fallow Province of New Brunswick Dept of Public Safety, Fredericton, New Brunswick

Category: Regulatory Authority

A. Ferguson Tarion Warranty Corporation, Toronto, Ontario

Category: User Interest

A. Gagné APCHQ A.E.S.E.Q., Anjou, Québec

Associate

P.O. Gildenstern Intertek Testing Services NA Ltd.,

Coquitlam, British Columbia

Associate

J.T. Gryffyn Ontario Ministry of Municipal Affairs and Housing, Toronto, Ontario

Category: Regulatory Authority

K. Habib CSA Group, Edmonton, Alberta

Associate

K. Koo KCG & Associates, Richmond Hill, Ontario

Associate

J. LeBlanc Province of New Brunswick Dept of Public Safety, Moncton, New Brunswick

Associate

1. McMillan M.M.H. Prestige Homes Inc., Sussex, New Brunswick Category: Producer Interest

   
   

2. Miller Chaparral Industries (86) Inc., Kelowna, British Columbia Category: Producer Interest

   
   

   1. Nigro Modular Housing Association Prairie Provinces, Sherwood Park, Alberta

Associate

C.G. Rattray Manufactured Housing Association of BC, Maple Ridge, British Columbia

Associate

K. Rauch Cobourg, Ontario

Category: User Interest

V. Rowe Atlantic Home Warranty,

Mount Pearl, Newfoundland and Labrador

Category: User Interest

E. Simard-Frenette Barrette Structural inc.,

Trois-Rivières, Québec

Associate

H. Starno MHI Canada,

Surry, British Columbia

Category: Producer Interest

J. Stevenson Champion Canada International ULC - Div of SRI Homes Kelowna,

Kelowna, British Columbia

Associate

J. Urquhart National Research Council Canada, Ottawa, Ontario

Category: General Interest

Y. Williams Manufactured Housing Association of Atlantic Canada,

Moncton, New Brunswick

Associate

A. Crees CSA Group,

Toronto, Ontario

Project Manager

Preface

This is the fourth edition of CSA Z240.10.1, Site preparation, foundation, and installation of buildings. It supersedes the previous editions published in 2008 under the title Site preparation, foundation, and anchorage of manufactured homes, and in 1994 and 1986 under the title Site Preparation, Foundation, and Anchorage of Mobile Homes.

Significant changes to this edition include the following:

1. change in the title to properly reflect the scope of the Standard;

2. clarification and expansion of application to additional types of buildings;

3. expansion of application of the foundation requirements to all one-storey buildings where the uniformly distributed live load on the floor does not exceed 2.4 kPa (50 lb/ft2);

4. addition of a general reference to the National Building Code of Canada for all issues not addressed in the Standard;

5. updating of the reference to CAN/CSA-O80 Series for preservative treatment of wood and addition of requirements for the appropriate type of treatment;

6. addition of a requirement in Clause 6.4.2 for integral footings for piles in frost-susceptible soil;

7. updating of the exposure factors for wind load resistance consistent with the National Building Code of Canada; and

8. updating of the calculation for resistance to pier toppling and overturning due to wind.

   This Standard is intended to be referenced by regulatory authorities, landlease community owners, and building designers and installers so that proper on-site installation of buildings can be achieved.

   
   

   This Standard was prepared by the Technical Committee on Factory Certification of Buildings, under the jurisdiction of the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee.

   Notes:

   1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

   2. Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

   3. This Standard was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this Standard.

   4. To submit a request for interpretation of this Standard, please send the following information to inquiries@csagroup.org and include “Request for interpretation” in the subject line:

      1. define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

      2. provide an explanation of circumstances surrounding the actual field condition; and

      3. where possible, phrase the request in such a way that a specific “yes” or “no” answer will address the issue.

         Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are available on the Current Standards Activities page at standardsactivities.csa.ca.

   5. This Standard is subject to review within five years from the date of publication. Suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquiries@csagroup.org and include “Proposal for change” in the subject line:

      1. Standard designation (number);

      2. relevant clause, table, and/or figure number;

      3. wording of the proposed change; and

      4. rationale for the change.

Z240.10.1-16

Site preparation, foundation, and installation of buildings

1. Scope

   
   

   1. Application

      This Standard applies to single- and multi-section buildings supported on longitudinal floor beams, or perimeter rim joists designed to perform as beams.

      
      

   2. Issues addressed

      This Standard specifies requirements for the following aspects of building installation:

      1. site preparation;

      2. permanent foundations;

      3. anchorage to resist overturning and pier toppling due to wind;

      4. connection of modules in multiple-section prefabricated buildings; and

      5. skirting.

      Note: The term “prefabricated building” is used in this Standard to refer to manufactured homes, modular homes, and other factory-constructed buildings.

      
      

   3. Users

      This Standard is intended to be used by builders, building officials, owners, and installers of

      1. buildings installed on surface foundations including prefabricated buildings; and

      2. multiple-section prefabricated buildings.

   4. Terminology 1.4.1

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.