Roofing Ready Reckoner: Metric and Imperial Dimensions for Timber Roofs of Any Span and Pitch

185 Pages·2001·0.86 MB·English

by  Ralph Goss(auth.)

ROOFING READY RECKONER
METRIC AND IMPERIAL DIMENSIONS FOR
TIMBER ROOFS OF ANY
SPAN AND PITCH
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© 2001 by the estate of Ralph Goss and Blackwell Library of Congress Cataloging-in-Publication Data
Science Ltd Roofing ready reckoner: metric and imperial
dimensions for timber roofs of any span and
Blackwell Science Ltd, a Blackwell Publishing pitch/Ralph Goss.—3rd ed./revised by Chris N.
Company Mindham.
Editorial Offices: p. cm.
Blackwell Science Ltd, 9600 Garsington Road, ISBN 978-0-632-05765-8 (alk. paper)
Oxford OX4 2DQ, UK 1. Roofs—Handbooks, manuals, etc.
Tel: [phone]. Carpentry—Mathematics. 3. Roofing.
Blackwell Publishing Inc., 350 Main Street, Malden, 4. Engineering mathematics—Formulae.
MA 02148-5020, USA I. Mindham, C.N. (Chris N.) II. Title.
Tel: [phone]
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CONTENTS
1 Introduction 1
2 Roofingterminology 2
3 Howtousethereadyreckoner 9
4 Metriccalculationtables 23
5 Imperialcalculationtables 99
6 Wallplateandgablestrapping 176
7 Windbracing 178
8 Roofingmetalwork 180
9 Toolsandequipment 182
v
1 INTRODUCTION
Theaimofthisbookistoprovideaquickandeasilyusablereferenceforthoseconstructingroofsfornew
buildings and extensions using cut roof or trussed rafter construction. The tables include data for
commonrafters,hipsandvalleyandcanalsobeusedforatticconstruction.Thisthirdeditionincludes
the218pitchincrementsusedintrussedrafterroofconstructionforpitchesfrom1718–4218.Thedatafor
2 2 2
steeperpitchesandmansardroofsupto758isretained.
Theadditionofhelpfulillustrationsandtextonwallplateandgableendstrapping,windbracing,truss
clipsandotherroofingmetalworkplusvaluableinformationonthetoolsandequipmenttocarryoutthe
work,extendstheguidanceonroofconstruction.
Although the text is in metric units, imperial comparison is shown in brackets after each dimension
withseparateimperialworkedexamples.Theallimportantdatatablesareretainedinbothmetricand
imperialunitsrespectingthecontinuingpopularityofthistraditionalmethodofmeasurement.
1
2 ROOFING TERMINOLOGY
Wallplate The‘foundation’oftheroofusually506100mmwide(2’’64’’),mustbebeddedsolid,level
andstraightonthetopofthewall,ornailedtothetimberframedpanelandstrappedinplacetoprevent
movementfromthestructure.
Purlin Membercarryingpartloadofthelongcommonrafters,traditionallyplacedatrightanglestothe
rafterbutnowmorecommonlyfixedvertically.
Pitch Theanglemadebytheslopeoftheroofwiththehorizontal.Thismaybestatedindegreesonthe
drawing,ormayhavetobemeasuredbyprotractorfromthedrawing,ormayhavetobecalculatedby
measurementifthenewworkistomatchanexistingroof.
Ridge The timber at the top of the roof where the rafters meet, giving a longitudinal tie to the roof
structure, commonly 38mm (11’’) thick, and of a depth equal to the top cut on the rafter plus approxi-
2
mately38mm(11’’).Thisdepthwilldependuponthepitchoftheroofandthetilebattenthickness.
2
Commonrafter Thetimberrunningfromtheridge,downoverthepurliniffitted,overthewallplate,
andtothebackofthefascia.
Jackrafter Thetimberrunningfromthehiprafterdownoverthepurliniffitted,overthewallplate,and
tothebackofthefascia.
2
Fig.1
3
Fig.2.
4
Valleyjackrafter Thetimberrunningfromtheridge,downoverthepurlin,downtothevalleyboardor
rafter.
Trussedrafter Aprefabricatedframeworkincorporatingrafter,ceilingjoist(ortie),andstrengthening
websformingafullytriangulatedstructuralelement.
Ceilingjoistortie Timbersupportingtheceilingofthebuilding,butoftenimportantly‘tieing’thefeetof
thecommonandjackrafterstogetherthustriangulatingandstabilisingtheroof.
Windbracing Usually25mm6100mm(1’’64’’)timbernailedtotheundersideofraftersandtrussed
raftersrunningatapproximately458tothem,totriangulateandstabilisetheroofinitsverticalplain.
5
Fig.3.