bs-86!3!1990 damp proof courses - guide to characteristic strength of damp-proof course materials...

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DRAFT FOR DEVELOPMENT DD 86-3:1990

Damp-proof courses Part 3: Guide to characteristicstrengths of damp-proof coursematerial used in masonry

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DD 86-3:1990

This Draft for Development,having been prepared underthe direction of the Elementsand Components (of DiverseMaterials) for BuildingsStandards Policy Committee,was published under theauthority of the Board of BSIand comes into effect on30 November 1990

BSI 02-2000

The following BSI reference

relates to the work on thisstandard:

Committee reference ECB/44

ISBN 0 580 18848 5

Committees responsible for thisDraft for Development

The preparation of this Draft for Development was entrusted by the Elements

and Components (of Diverse Materials) for Buildings Standards PolicyCommittee (ECB/-) to Technical Committee ECB/44, upon which the followingbodies were represented:

Associated Lead Manufacturers Limited

Association of British Roofing Felt Manufacturers

Association of Jute Spinners and Manufacturers

Autoclaved Aerated Concrete Products Association

Brick Development Association

British Board of Agrement

British Ceramic Research Ltd.

Consumer Policy Committee of BSIContract Flooring Association

Copper Development Association

Department of the Environment (Property Services Agency)

Department of the Environment (Building Research Establishment)

Institute of Building Control

Institute of Clerks of Works of Great Britain Inc.

Lead Sheet Association

Local Authority Organizations

Mastic Asphalt Council and Employers Federation

Natural Slate Quarries Association

Packaging and Industrial Films Association

Royal Institute of British Architects

Royal Institution of Chartered Surveyors

Society of Chemical Industry

Amendments issued since publication

Amd. No. Date of issue Comments


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DD 86-3:1990

BSI 02-2000 i

Contents

Page

Committees responsible Inside front cover

Foreword ii1 Scope 1

2 Definitions and symbols 1

3 Characteristic strengths 1

Table 1 Characteristic strengths for DPC materials 2


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DD 86-3:1990

ii BSI 02-2000

Foreword

This Part of DD 86 has been prepared under the direction of the Elements andComponents (of Diverse Materials) for Buildings Standards Policy Committee.

The code of practice for structural use of unreinforced masonry, BS 5628-1 states:Designers should pay particular attention to the characteristics of thematerials chosen for damp-proof courses. Materials which squeeze out areundesirable in highly stressed walls, and the effect of sliding at thedamp-proof course should be considered especially in relation to lateralloading. In general, advice on the resistance to compression, tension, slidingand shear should be sought from the manufacturers of the damp-proof course.

This Draft for Development is intended to provide provisional data relevant tothe design of unreinforced masonry incorporating damp-proof course materials(see qualifying provisions below).

It has been assumed in the drafting of this Draft for Development that thestructural design will be entrusted to appropriately qualified and experiencedpersons conversant with the recommendations and calculation procedures givenin BS 5628-1.

This publication is not to be regarded as a British Standard.

It is issued in the Draft for Development series of publications and is of aprovisional nature because further evidence is required before the data givencan be incorporated into a British Standard.

It is recommended that it should be applied on this provisional basis so thatinformation and experience of its practical application may be obtained.

A review of this Draft for Development will be carried out not later than two yearsafter its publication.

Notification of the start of the review period, with a request for the submissionof comments from users of this Draft for Development, will be made in an

announcement in the appropriate issue ofBSI News. According to thereplies received, the responsible BSI committee will judge whether theDraft for Development can be converted into a British Standard or what otheraction should be taken.

Observations which it is felt should receive attention before the official call forcomments will be welcomed. These should be sent to the Secretary of BSITechnical Committee ECB/44 at the BSI Head Office address as shown onthe back cover.

The British Standards Institution requests that, because of the provisionalnature of this publication, its reference number should not be marked onproducts.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,

pages 1 and 2 and a back cover.

This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table on theinside front cover.


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DD 86-3:1990

BSI 02-2000 1

1 Scope

This Draft for Development provides guidance on

the characteristic strengths developed betweenmortar and the damp-proof course (DPC) materialaccording to the mode of loading. The provisionaldata derive from tentative test methods givenin DD 86-1 and DD 86-2. The characteristicstrengths are intended to be used in combinationwith the design procedures set out in BS 5628-1and concern those loadbearing elements of anunreinforced masonry structure including a DPC.

NOTE The titles of the publications referred to in this Draft forDevelopment are listed on the inside back cover.

2 Definitions and symbols

For the purposes of this Draft for Development,the definitions and symbols given in BS 5628-1and BS 5628-3 apply.

3 Characteristic strengths

3.1 When selecting a DPC material, considerationshould be given to the following design aspects.

a) Flexural stress occurs at the interface betweenthe DPC and the mortar bedding when themasonry is subjected to lateral forces such aswind loading or earth pressure, and when lateralloads and bending moments are transmitted fromconnecting members. Free standing walls,parapet walls and panel walls are particularlyvulnerable.

b) Shear stresses occur at the interface betweenthe DPC and the masonry, both transverse to and

along the line of the wall, when the masonry issubjected to lateral forces or moments as initem a) or as a result of relative expansion orcontraction of masonry on either side of the DPC.

c) Bituminous DPCs of the type complying withBS 6398 may squeeze out from the face ofmasonry walls when subjected to permanentvertical load, particularly on south facing walls.The compressive loads should be limitedaccordingly.

3.2 The characteristic strengths at the mortar/DPCinterface for flexible DPC materials are givenin Table 1. The strengths are derived from tests in

accordance with DD 86-1 and DD 86-2.

The values given in Table 1 should be used incombination with a partial safety factor m of notless than 3.5 regardless of the category ofconstruction or manufacturing control.

In no case should the characteristic strength at themortar/DPC interface be taken as greater than thatof the mortar itself without DPC.

3.3 For rigid and semi-rigid DPC materials, thecharacteristic strengths should not exceed thevalues given in Table 3 of BS 5628-1:1978 for thecategories of brick, block and mortar shown or,

alternatively, tests may be carried out in accordancewithA.3 of BS 5628-1:1978.


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DD

86-3:1990

2

BSI02-2000

Table 1 Characteristic strengths for DPC materials

PropertyMortar

designationin BS 5628-1

Bitumen DPCPitch/bitumen

polymerPolyethylene

Masticasphalt

Copper Lead Zinc

N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 N/mm2

Characteristiccompressivestrength,fk

i)

ii)

iii)

iv)

0.5

0.5

0.5

0.5

(see note 1)

Mortarstrength

(see note 2)

Mortarstrength

(see note 2)

Mortarstrength

(see note 2)

Mortarstrength

(see note 2)

Mortarstrength

(see note 2)

Mortarstrength

(see note 2)

Characteristicshearstrength, fv(see note 3)

i)

ii)

iii)

iv)

0.25 + 0.6gA0.25 + 0.6gA0.25 + 0.6gAMortar

strength(see note 5)

(see note 4)

0.20 + 0.6gA0.20 + 0.6gA0.20 + 0.6gAMortar

strength(see note 5)

0.15 + 0.6gA

0.60 + 0.6gA

0.40 + 0.6gA

0.07 + 0.6gA

0.45 + 0.6g

Characteristicflexuralstrength,fkx

i)

ii)

iii)

iv)

0.35 or 0.55(see note 6)

See note 7

0.20

0.55

Mortarstrength(see note 5)

0.35

Mortarstrength(see note 5)

NOTE 1 The value offk is for a single layer of bitumen DPC. It is limited by the long term compression of the DPC.

NOTE 2 Limited by compressive strength of the mortar. There is no extrusion or long term compression of the DPC.

NOTE 3 gA is the design vertical load per unit area as defined in BS 5628-1.

NOTE 4 The value offv corresponds to a short loading time, e.g due to wind action.

NOTE 5 The characteristic strength of the DPC material is either equal to or greater than the mortar strength. Hence for purposes of calculation the strength of the mortar shouldbe the determining factor.

NOTE 6 The value of 0.55 applies only to high bond strength DPCs (see Appendix C of BS 6398:1983).

NOTE 7 Reference should be made to manufacturers literature. The value offkx is unlikely to be critical except when using designation i) mortar with low absorption bricks.


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DD 86-3:1990

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