Rafter lengths, roof bevels, and the steel square. by McEwin, George.

Cover of: Rafter lengths, roof bevels, and the steel square. | McEwin, George.

Published by Crosby Lockwood in London .

Written in English

Read online


  • Roofs -- Tables,
  • Rafter gages

Book details

LC ClassificationsTH2398 .M28 1968
The Physical Object
Paginationx, 120 p.
Number of Pages120
ID Numbers
Open LibraryOL5673836M
ISBN 100258967358
LC Control Number68135800

Download Rafter lengths, roof bevels, and the steel square.

Full-Length Roof Framer. A series of tables giving the full length of all rafters for any span for 48 different pitches. Cuts and bevels for Common, Hip, Valley, Jack, and Purlin rafters; also cuts and bevels for Gable and Cornice Mouldings, accompanying each of the 48 pitches with illustrations/5(60).

The CARPENTER'S STEEL SQUARE: And Its Uses: Being a Description of the Square and Its Uses in Obtaining the Lengths and Bevels of All Kinds of Rafters, Hips, Groins, Braces, Brackets, Purlins, Collar Beams, and Jack-rafters [PDF] Industrial publication Company, The calculations cover every roof pitch from 5° to 75° in 1° increments.

Full details on the use of this simple guide are given in the Introduction to the book. The angles are clearly drawn in line diagram form allowing the reader to set up a sliding bevel quite simply and KNOW the result is accurate. 11 Inch Run 12 pitch roof 12 roof 9 Run Amount To Drop board as shown builder center line Common Rafter Figure Common Rafter Lengths crowned edge Cut at Ridge Cut Rafter Tail degree angle Dropping The Hip end wall feet Figure 13 Foot 7 Inch foot of run framing square gable roof hip and valley hip jacks hip or valley Hip Rafter hip roof.

Main same roo'f to be marked with a square or bevel 12x6 inches. Length of rafter measures from A to B 13' 5 inches, as 'shown on fig.

13 and Hip or valley rafter for same roof to be marked with a square or bevel 6x and inches, length of. Title: rafter book - page 1 Created Date: 2/24/ PM. the respective lengths for those two rafters and add them together. EXAMPLE: Using the 7 Inch Rise table (and our 15' run), the common rafter length is 17' 43⁄ 8".

This is the rafter length from the top cut to the seat plumb mark. tail or eave Length: The tail or eave overhang must be added to the rafter length.

Calculate the length of a rafter from the roof slope ratio of inches per foot, and a building width measurement. Includes result for hip/valley factor, slope factor and the roof slope in degrees. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

The length of the rafter. The rise of the rafter. The run of the rafter. Height of the scaffold; Rafter Calculator Instructions. Enter the value for the roof width (outside to outside) in feet, inches, and fraction, inches and fraction, or use the inches box to enter a value in decimals if that is your preference.

The dotted line is how the rafter length measurement is used, measure from the point at the top, down the length and plumb a line there. Step 1: Determine the camber along the timbers length; Before you can mark the rafter lengths and layout, check the camber of the timber.

Lengths of roofing timber almost always bow slightly. Fig. - Obtaining the Lengths of Jack Rafters with the Steel Square. Fig. - Finding Lengths and Bevels of Rafters on Roofs of Unequal Pitches. The lengths of hips, valleys and jacks on roofs of unequal pitches may be found in the same manner by taking figures on the blade and tongue of a square which will represent the different pitches.

Our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length calculator, lineal feet of rafter, board feed in ridge and sub-facia,and the total board feet in the roof.

Rise and Run Rafter lengths that a 6/12 pitch roof has 6" of rise (vertical) for each foot of run (horizontal). Full Length Roof Framer: A Series of Tables Giving the Full Length of All Rafters for Any Span, for 48 Different Pitches.

Cuts and Bevels for Common, Hip, Valley, Jack and Purlin Rafters; Also Cuts and Bevels for Gable and Cornice Mouldings, Accompanying Each of the 48 Pitches with Illustrations5/5(3). Rafter Length Formula: While making roofing for your house with the roof rafters, it is important to know the rafter length to make the roof seat perfectly on the rafter.

Given here are the formulae to calculate the length of a shed roof rafter to make your roofings stronger and look beautiful.

Common Rafter Length and Bevels When determining the lengths and bevels of common and the steel square. book, it is normal to consider them as single lines rather than rafters of a certain width or thickness.

If the rise and the span are known, it is a simple procedure to determine the length of the common rafter and its main bevels. The roof section can be set. This is our Ultimate Roof & Rafter Guide for people designing and building an off grid cabin or tiny home. Discover the pros and cons to multiple roof designs.

Learn the #1 rafter design that will guarantee your roof that is safe and strong for years to come. How to use a framing square and its etched-on tables to figure out roof slope & rafter lengths. A carpenter's framing square includes some tables stamped right into the tool itself.

This article explains how to make quick use of a framing square and its imprinted data to get some basic roof measurement data like roof pitch or slope, rafter lengths, and end cuts.

the rafter length, but the two are added together to obtain the total rafter length. Plan View The plan view is a view looking straight down on the roof Measuring Line The length of a rafter is measured and laid out on a measuring line on the rafter.

The measuring line on a common rafter with an eave, is located along the side of rafter parallel to. Hip roof framing rafter cut angle template diagram: If using a Circular Saw or Compound Miter saw, set saw bevel angle to 45° to obtain Creeper and Hip side angles. With the saw bevel angle set to 45°, cutting hips and creepers at the plumb cut angle will produce correct side angles.

See Saw Miter and Blade Angle Settings. The rafter tables on the standard framing square were developed at the turn of the last century and provide values to determine only 5 basic pieces of information: 1) length of common rafters, 2) length of hip and valley rafters, 3) the side cuts for the hip or valley and jacks rafters, 4) the difference in length for jack rafters.

Allow for Ridge Thickness when determining Rafter Run to Outer Wall. eg: Half building width minus 1/2 ridge thickness. See Rafter Run to Outer Wall Calculator below. Print full scale Rafter Plumb Cut Templates and Birdsmouth Templates Fold template over rafter to mark or cut through.

How to transfer the bevels required to construct a Hip roof from paper to a steel square. Structures such as sheds or barns can be frames with rafters every " Again, make sure to consult local codes.

If your project had a rafter length of 8' or less, a safe and strong method is to use 2x8 framed 16" on center. It is always better to have a large rafter, rather than be concerned with a sagging roof.

M easure the rafter length along top edge of rafter. Mark another plumb cut same as above. This line represents outside wall of the build­ ing. (The same point from which you meas­ ured the width of the building). Add what­ ever length you want for a tail or eave to the rafter lengths given in the table in back of book.

When the widths of the major and minor roofs are not equal a long valley rafter will run from one inside corner of the intersecting roofs to the ridge of the major roof and a short valley rafter will run from the opposite inside corner of the intersecting roofs to a point on the long valley rafter that it inline with the ridge of the minor roof.

The steel square is a mighty factor in roof framing, and without doubt the greatest tool in practical potency that ever was invented for the carpenter. With its use the lengths and bevels of every piece of timber that goes into the construction of the most intricate design of roof, can easily be obtained, and that with but very little knowledge.

Re: Rafter lengths and bevels by triangles Joe, Roof framing is basically divided into two parts,lengths and obtain the necessary information the two most widely used methods are by using a roofing square or a calculator with trigonometry functions (or a combination of both).

It seems that most of the others used a rafter length book, or some sort of book reference, to get the length of rafters, jack rafters, etc., instead of taking the time to go into the math involved to determine how to get rafter lengths, presetting your ridge beam, heel stand height, the theory of the hip roof, gang cutting rafters, etc.

A roof 14 feet wide would have a run of 7 feet, third-pitch would rise 8 inches to every foot run. Therefore, place the square on 8 and 12 seven times, and you have the length and cuts. Fig. For the octagon rafter, proceed same as for common rafter, only use 13 for run (in place of 12 for common rafter).

Roof Pitch Calculator Results Explained. Slope - The slope of a roof is represented as X/12, where X is the number of inches in rise for every 12 inches of is very useful information for many purposes, especially for roof framing - the slope, sometimes called pitch, is calibrated on speed squares.

Angle - The angle of a roof is the same as the roof's slope, except instead of being. The length of the common rafter doubles its run or has a length equal its span when it has a rise of 60 degrees, which taken on the square is inches rise to the foot.

The same is true of the octagon hip when it has a rise of a fraction less than 23 inches, and that. the roofing square is an amazing tool when you know how to use it e.g all you need is the span of the roof and a pitch e.g if you want a 35 degree pitch common rafter the square tells you it has a mm length per meter run so for a 4m span roof with the run being half the span the common rafter is mm at the measuring line its the same for a hip or valley but they are mm p.m.r.

The steel square is a tool used in ters use various tools to lay out structures that are square (that is, built at accurately measured right angles), many of which are made of steel, but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various the steel square is more commonly referred to as the.

Five tools in one: a tri-square, a miter square, a protractor, a line scriber, and a saw guide. The Speed Square is constructed of durable heavy-gauge aluminum alloy. Includes markings for Swanson's One-Number Method of rafter layout, and is packaged with the Swanson Blue Book of Rafter Length and Roof Construction.

Matte finish to prevent s:   For instance, for a rafter that has a roof pitch of 12/12, the square reads instead of in. Take any unit of run for your rafter for this pitch and multiply it by to get your rafter length. For example: 12″ run x = ″ 1 foot run x.

This Swanson square comes in 7 inch length and manufacture in USA with finest quality aluminum alloy. This model already has best rating on amazon due to working accuracy and easy in use.

The square comes with detailed guide book that contain 62 pages and provide extremely help in straight measuring while construction of roofs and stairs.

Framing square guides are small, inexpensive metal attachments to the framing square that are locked in position on the square’s edges at the pitch and run dimensions to define the roof angle and make the repeated marking of the rafters much more efficient.

Square guides are available at most hardware and home improvement centers. A bevel. The Rafter Book: A Modern Handbook for Roof Framers by David Mahin McIntire. Give yourself an edge over the competition. Become a faster, more accurate, and more efficient roof framer with The Rafter Book.

Used by Carpenters Union apprenticeship programs from Hawaii to New York. The Rafter Book works. It's modern. Photo 2 shows how to use the speed square to mark a /2 degree angle—the same, as you would need on a rafter tail for a roof with an 8/12 pitch. Before miter saws, and even since, professional carpenters used speed squares as a quick saw guide for cutting and degree angles.

Rafter Tools+ is a rafter calculator for complex roof framing angles that other roof framing calculators don't offer. Stair Tangent for iPhone This iPhone app is for rough frame carpenters that don't build stairs everyday, but could use an stair app calculator to check their stair building calculations.

The carpenters' steel square, and its uses: being a description of the square, and its uses in obtaining the lengths and bevels of all kinds of rafters, hips, groins, braces, brackets, purlins, collar-beams, and jack-rafters: also, its application in obtaining the bevels and cuts for hoppers, spring mouldings, octagons, stairs, diminished.

This video show how to develop the bevels required for an Oblique End Hip Roof using the steel square method. Oblique End Hip Roof Bevels, Steel Square Method. Hip Rafters. For lengths and bevels of jacks, proceed as follows: For end of roof, and set 2 feet on centers, take a board and apply the square to it, as shown in Fig.

91, with the length of the end rafter on the blade and the run of the side rafter on the tongue. Space off 2, 4, 6, 8 and 10 in. on the tongue after marking along both blade and tongue.

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