Synonyms for framework include structure, frame, scheme, system, configuration, fabric, arrangement, order, basis and composition. To me, the rafter span is unchanged. I'm a little confused as I'm still getting the instability error? common rafter on an 18/12 sloped roof, the rafter length will be 21.63" Also use these tables for stair rise and run and riser heights and stair stringer layout. Your hand calcs provide a significant resistance to the horizontal thrust which may or may not be present. The spread deflection (at the roller) is shown as .331" under full load (DL, snow, and wind). But you DO need to consider this ridge board thickness when laying out the exact location of the birds' mouth cut at the rafter's lower end. Your actual overhang will simply be about 3/4" further out than was called for by your architect. Here is another example of common rafter length for a very low slope The thrust reaction is 527 pounds so it will be about 270 pounds at each wall right? blade front. The model is currently unstable." Unknown safety factor I guess. lengths for the various types of rafters on a 6/12 slope roof. Plywood sheathing by itself is not reliable as a beam. READ PAPER. try adding an out of plane reaction at the peak and to each of the bottom supports. Over the weekend I created 2 models. There in the top of the column of numbers you'll see 12.37. ARPASEVAN's numbers must assume no thrust resistance at the supports, which is conservative. 10.75" on a 6/12 slope roof. The error says "inadequate restraint. Our new rafter run will be 12 ft. not 10 ft. (before allowing for 8 feet of horizontal run (in our example) will give us 8 ft x 13.89" = 111" = 9' 3" of rafter length. That is, on this roof there will be a 6-inch rise in 12-inches of horizontal run. foot of horizontal run on a 6/12 slope roof. The walls can not resist thrust through cantilever action. the top plate of the wall. You're NOT BUILDING FURNITURE Henry would shout. I have all the ends of the members set as pinned and the supports are pinned. 3. concrete shall have minimum strengh of 2000 psi 28 days. is this really the final rafter line length? two feet horizontally past the wall front, we need to increase the run Not really. rest definition: 1. to (cause someone or something to) stop doing a particular activity or stop being active for a…. applications this is the Rafter span. Gantry definition is - a frame for supporting barrels. An integrated E/E solution solves tomorrow’s challenges and supports companies as they strive to overcome complexity and reduce time to market. You need to increase the run length to account for the amount of roof run. Roof measurement methods: these articles explain various methods for measuring all roof data: roof slope or pitch, rise, run, area, and other features. distance) and rise (vertical distance) along the length of a rafter. I created a model, but am getting an instability issue. Definition of Roof slope: the slope of a roof or rafter is its angle off of dead flat or horizontal, expressed as the number of inches of rise or increase in height per foot or 12" of horizontal run or distance. Using the rafter The only way your system to work with the current location of the truss tie is using a stronger/stiffer rafters, probably a 2x10 or 2x12, possibly an LVL. roof sketch shown earlier. By inspection the length of … roof slope also as inches of rise per foot of horizontal run. Note that many of these terms are humorous and appear only in word lists. I feel like the double top plate can take out 270 pounds at 16" on center. If the resistance is set up … Already a Member? Well it could be. They're anchored to the foundation but I don't count on that to provide any out of plane resistance. Yes, the hurricane tie won't do anything. [1] "How to Measure Angles with a Ruler", South Dakota School of Mines and Technology, Website: http://www.mcs.sdsmt.edu, http://www.mcs.sdsmt.edu/tkowalsk/portfolio/downloads/pub_HowToMeasureAngles.pdf retrieved 10/26/2013, copy on file. Shingles are thin pieces of wood or other materials that ovelap each other in covering a roof. The rafters are about 14'-6" in length, roof pitch is 6:12. That tells us that for a each foot of horizontal run distance. Neither top of wall connection can provide a horizontal restraint. Notes for surveyors / building control officers. Maximum Fascia Beam Span, can also be used as Post spacing R Maximum Rafter spacing also used for Maximum Purlin span P Maximum Purlin spacing. A collar tie and a tension tie in IRC code terms are different animals. This key is at the left end of the front of the framing square Am I missing something? Now let's put those line names together with the numbers we read a frame for supporting barrels; a frame structure raised on side supports so as to span over or around something: such as… See the full definition blade on a framing square. I strongly dislike acronyms and abbreviations. As someone said above the other issue is going to be the connection between the rafter tie and rafters...the tension is 1.6 kips. = 21.63 = inches of rafter length per unit I think in real life this falls somewhere in between the pinned and rolled condition and the walls can take some thrust. Some texts may also call this the rafter line length so one needs to take care. Panels shall be precut so that they shall be attached to the framing surrounding the opening containing the product with the glazed opening. fractions. convert this to 8ths 16ths or 32nds or 64ths, multiply 0.3 x 8 (for one with a roller support at one end and one with a pin. length table below, this signifies that we are looking at rafter What are you calling a cantilevered wall? Sterling Publishing. This shouldn't be the case as the frame should resist the forces and not just deflect indefinitely, right? The roof diaphragm provides this restraint. image of the model attached also. InspectAPedia tolerates no conflicts of interest. Find more similar words at wordhippo.com! inch number along the blade's upper edge. Timber framing and "post-and-beam" construction are traditional methods of building with heavy timbers, creating structures using squared-off and carefully fitted and joined timbers with joints secured by large wooden pegs. tells us that the length of a common rafter for each 12" of run will be The tension tie does not support the rafter vertically. Please let us know here why this post is inappropriate. John Wiley & Sons, 2006. . back to inches. A collar tie and a tension tie in IRC code terms are different animals. I made one of the supports a pin and fixed all the rafters except the end of one member at the ridge. A. aerie (or eyrie) of eagles 4. open lattice or trellis shall be pressure treated lumber. Above my pencil is pointing to the 6-inch mark read along the FRONT of the framing square BLADE (the long arm). The difference in length of sequential jack Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Rafter Boards: The boards creating the slope of the roof are wider than lumber used to build trusses – 2x8s, 2x10s and 2x12s are most common in rafters vs. 2x4s in trusses. Registration on or use of this site constitutes acceptance of our Privacy Policy. The two ends of the collar tie are pinned and I'm still getting an instability. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. And Typically, truss action is not effective in this setup unless the tension tie is located either at the wall plate or very close to it. since unlike furniture makers, roof framers won't measure accuracy to Normally roof slopes are expressed as inches of rise per foot of 12" /ft. Henry Page (H.G. My questions is in practice there is no blocking at 4' so are we assuming that the sheathing is laterally bracing the rafter? will be 11.32" long on a 6/12 slope roof. For example on a 10 ft. run, if we want the roof overhang to extend choosing a "full scale" number that matches the unit rise (slope or Click Here to join Eng-Tips and talk with other members! under the 6-inch mark on the same blade surface. When I see a roof framed by a carpenter who simply omits the birds' mouth cuts I figure that she didn't know how to lay out the birds' mouth cut and was just avoiding this predicament. triggerHandler(): If you are using this jQuery / jqLite function on the input elements, you don't have to attach the elements to the document, but instead change the triggered event to "change". "Choosing Roofing," Jefferson Kolle, January 1995, No. the top edge of the framing square blade. Check Boundary Conditions. Any idea why I'm getting this error? What is the preferred method for attachment? rafters if spaced 24" o.c. The tension tie does not support the rafter vertically. Roof Rafter Collar Tie Calculations/Design, Structural engineering general discussion Forum, https://files.engineering.com/getfile.aspx?folder=26ccf25e-8a2a-4381-b274-1, https://files.engineering.com/getfile.aspx?folder=fc21f104-c26d-46f8-9949-a, https://github.com/buddyd16/Structural-Engineering, https://files.engineering.com/getfile.aspx?folder=3a6e0412-bab6-4520-9539-f, https://files.engineering.com/getfile.aspx?folder=b4504adf-b391-4274-aa27-7, https://files.engineering.com/getfile.aspx?folder=376ceffb-30e2-49ca-8d05-0, https://files.engineering.com/getfile.aspx?folder=c50911cd-8a37-4e13-a796-3, Engineering as It Should Be - Chapter 2: Document Security, Accelerating Electrical Systems Design and Analysis, Blurring Boundaries in E/E Systems Development. I'm not understanding why the IC of the collar tie is coming up at 0.0 though. Holding the framing square with the front of the blade facing you and the tongue pointing down and on your right, you'll see six lines of rafter tables: To the right of each of these rafter type line names are columns of numbers under each This is our most economical choice in detached multiple car garages that are built on site. Looking at the moment diagrams (attached), it's behaving as expected. I do these in a 2D frame program as I can easily see the deflection - which seems to control a lot of the cases. Constructing Staircases Balustrades & Landings. I'm not sure how to approach it calculation wise? So what's our total rafter length from center point of the ridge to outer face of the wall? Spence, William P. (2000). Our sketch above illustrates the concepts of run (horizontal Definition of Rafter Rise or Roof Rise: a rafter's rise or the roof's rise is the total increase in vertical height over the rafter run or rafter span - the vertical distance shown in the center of our sketch above. Above we see the key to the lines in the rafter length table. more than an eighth. 32 Full PDFs related to this paper. Rafter Length = 18 ft 1/4" is the length from the ridge centerline Just load the goddamn lumber and stop picking over it. In our sketch above, the mid-span rafter tie is shown as under "neutral" force. This column of numbers go up to a maximum of 4500 allowing for long spanning roof sheets. To use the rafter length tables on the framing square blade front So if our rafter run or span is 10 feet we calculate the rafter length from ridge to outer wall face as, 12.37" / foot of span x 10' of span = 123.7" of total rafter line length (before adding for roof overhang and before subtracting half the thickness of the ridge board. Promoting, selling, recruiting, coursework and thesis posting is forbidden. How to use the rafter tables on a framing square to measure & lay out rafters or to figure roof pitch, slope, length, and all other roof and angle measaurements. In my office, we set the in plane horizontal restraint at the ridge. For the pin model, the rafter ICs are below 0.805 and are adequate for strength. You need to check deflection at the top of the wall for H/240 or whatever you deflection criteria is in addition to the ridge deflection. MCQ OF STEEL STRUCTURE DESIGN. I did a hand calc and this is what I came up with (attached). ..so I don't think that will be an issue. I assume the C is "capacity" but I'm darned if I know what the I stands for. I modeled it with collar ties located for a 9' ceiling. If you're not building a precise overhang you don't have to change the total rafter length to account for half the thickness of the ridge board. Let's look again at the drawing above and review some definitions of basic rafter and roof framing terms. ), This discussion got promoted to its very own web page. Under loading, both walls should spread evenly. Architectural-Graphic-Standards.pdf Assembly descriptions can be found in ANSI/ASHRAE/IESNA Chapter 2 and Appendix A.; Where using R-value compliance method, a thermal spacer block with minimum thickness of 1/2 -inch and minimum R-value of R-3.5 shall be provided, otherwise use the U-factor compliance method in Table C402.1.4. length in inches of the rafter type for the corresponding particular Watch out: Ignoring this adjustment means your bird's mouth cut for the wall top plate connection will end at the wrong location - the plumb cut part of your birds' mouth cut will be too far out past the wall face. No. Here is a car garage that offers a permanent detached garage for your home or business. What the heck is IC? Learn more. The model results show that 2x10s are over stressed (image attached), however, they will be sistered to the existing 2x6 rafters so I don't think that will be an issue. Define pier. Login. horizontal run on a 6/12 slope roof. The tops of the walls are modeled as rollers. Yes, I think that might be the best option. Dezeen Awards is the architecture, interiors and design awards programme organised by Dezeen, the world's most popular design magazine. Open Source Structural Applications: https://github.com/buddyd16/Structural-Engineering. For a common rafter, or for each of the other rafter types, these Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Definition of Rafter Total Length: When we add the additional rafter length necessary to include the roof overhang I call that the rafter total length. The tension in the collar tie is 1.23 kips, so the connection between the collar tie and rafter must be designed for this tension. rafters spaced 16" o.c. I agree with Celt83. Interaction coefficient. She has served as a U.S. representative from California since 1987. If in our building the rafter span is 10 feet (the building, would thus be 20 feet wide), we calculate the required rafter length This is often done with fully vaulted ceilings for spans up to 30 feet or so. I don't use RISA and would not have known what UC meant either. 12.37" long if the roof rise is 3" in 12. a platform on pillars extending from shore over water: Part of the pier was washed out in the storm. will be 17.88" long on a 6/12 slope roof. 2. roof sheathing shall be continuous over 2 or more rafter spans, face grain shall be perpendicular to supports and macimum span shall be as follows. The tie to rafter connection also has to be very robust. 92, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the, Best Practices Guide to Residential Construction, by Steven Bliss. A common rafter will be 13.42" long per foot of Unless the walls are not wide and you can get some benefit from the top plate stiffness, there is technically no horizontal resistance available. The side cut length of hip or valley rafters listed earlier. The drawing below is excerpted from ROUGH CARPENTRY (NAVEDTRA) . Watch out: be sure you are finding the 7-inch number along the TOP of your BLADE FRONT - not the 7" marked on the bottom of the blade front. I go into attics all the time and don't see blocking and 2x10s spanning 20' and the rafters are not buckling. Just about anything can be used to hurt or kill someone. The single story detached garages (also called our Standard Garages) come in 2, 3 or 4 Car Garage designs and can be customized in many ways to match your tastse. or do you assume the rafter is spanning the full 14-6"? We haven't yet considered the roof overhang past the face of the building wall. roof. you need first to understand the type of rafter you are cutting. Detached Garages Single Story. I have found a few depending on what your definition of "weapon" is. The only thing I am unsure about is the thrust reaction at the roller. Farm buildings have been constructed on that principle but engineered structures. I don't have to account for any moment in the connection. For a simple gable roof, the span (wall to wall) will be twice the size of the run (wall to ridge, horizontally). Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. I marked it in red to make it easier to spot. Or if you want to So basically, sistering a 2x12 to the existing 2x6 may work (have to check it). This "7" heads a column of numbers below it, corresponding to the various rafters, hips etc. *Eng-Tips's functionality depends on members receiving e-mail. Here we describe how to use the rafter tables found on the front 1.When a body is subjected to a system of loads as a result of this, some deformation takes place. Bending does not need to be designed for since the member was modeled as tension only correct? Spar definition, a stout pole such as those used for masts, etc. Nancy Patricia Pelosi (/ p ə ˈ l oʊ s i /; née D'Alesandro; born March 26, 1940) is an American politician serving as Speaker of the United States House of Representatives since 2019, and previously from 2007 to 2011. Previously, these 2x6 members were at the top plate level acting as ceiling joists/rafter ties, but it's been opened up to create an open space. Apologies for the delay. They could hold up under dead load, then collapse when loaded with snow. After several conversations with the owner/carpenter, he finally understands that this will not work so he's agreed to lower the collar ties. So basically, we need the collar tie and rafters to resist all the thrust. mfstructural,model it as shown below and you will not get the instability error. Valley rafter is the diagonal rafter forming the intersection of two sloping roofs. An 18-in-12 slope roof is one whose height above horizontal increases 18 inches up for every 12 inches of horizontal distance. In the top line of the rafter table shown above on the framing square BLADE FRONT, near the HEEL of definition of - senses, usage, synonyms, thesaurus. length by two feet. thickness of siding and trim). I haven't done a calculation for roof rafters/collar ties in a while and I'm a little rusty. For more complex roofs, you may need to calculate it section by section. Really? The first or highest line under the inches scale is COMMON RAFTER LENGTH PER FOOT OF RUN. Uninteresting that none of the comments above consider the effect of roof plywood sheathing providing a beam effect within the plane of the roof sides. Valley is the internal angle formed by two slopes of a roof. We have no relationship with advertisers, products, or services discussed at this website. The collar tie is set as a tension only member. Click to Show or Hide Citations & References, How to figure roof rise, run, rafter cuts, braces, or stair stringer layout with a framing square, FRAMING SQUARE N JOISTS RAFTERS N RUN FT-IN, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, COMMON RAFTER LENGTH PER FOOT OF RUN - this is the top line in the rafter length tables, HIP OR VALLEY RAFTER LENGTH PER FOOT OF RUN. Online Dictionaries: Definition of Options|Tips Options|Tips It also looks like the tension tie is too high. See more. How would I approach this? Same thing as UC in RISA. Divide the slope by two to get the pitch. Plywood sheathing, properly nailed, combined with a continuous chord member along the eave could provide beam action. per horizontal foot of run. angle) of the roof. This The drawing, one we've corrected from NAVEDTRA and cited and provided in PDF form at the end of this page, shows that for each horizontal foot (12") of run, the sloped rafter length will be 13.89". a framing square, look under the 3-inch mark where you find the 3" on I set the unbraced length as 4'. either N5 or N1 needs to be a roller, otherwise you haven't satisfied this. To me, the rafter span is unchanged. ; a mast, yard, boom, gaff, or the like. If the attic is accessible by permanent stairs or ladder, any cable running across the top of joists will have to be protected. Illustrated here is how to figure the rafter length from ridge board face to the edge of the rafter at the face of the outer wall, if the slope is 7" of rise per 12" of horizontal run. Another solution may be to use a deep glulam structural ridge beam to act as an interior support at the ridge and remove the need for the tension tie. Watch out: take a second look at our Details of how to do it as well as photos of hardware that let you omit the birds mouth cut are. Yes, it is unfortunate that they went and did all this without doing an analysis before. For a roof with the ridge above one wall, the span is the same as the run. Definition of Roof Span: In a symmetrical roof such as the gable roof shown above, the total building width between the outer faces of the walls or wall top plates is the total area spanned by the roof or total horizontal span. The side cut length of jack rafters will be I have a habit of calling it IC from a while back. As others have mentioned, horizontal deflection at the top of the is a concern, I believe the truss plate institute limits it to 1.25” at the top of the wall. In that article you'll see that my cuts are not perfect either. And this is with 2-2x6. There at the top of the data column you will see the value 13.89 - that is the number of inches of rafter length for a rafter whose slope is 7 inches of rise per 12 inches of horizontal run. What is the preferred method for attachment? (one foot) of run, Rafter Length = 10 units x 21.63" per unit, Rafter Length = 216.3" or we can divide by 12 to get feet and 15 x 12 girders = 18Q stinups 2. . overhang or eaves out past the wall. Neither of these terms is standard structural jargon and should be avoided or defined before use. Truss is a prefabricated triangular shaped unit used for supporting roof loads over long spans. Cable run across the top of joists. Rafter Line Length ridge to top plate outer face = 216.3 / 12 = 18.025 ft. And to be very precise we could convert the fraction of a foot ( .025) The full scale number will be the length of the rafter in inches for Does the collar tie reduce the span of the rafter? at FRAMING SQUARE for BIRDS MOUTH CUT - don't feel bad. You know you're reading correctly when the whole inch numbers (like the red 7 in my example) is centered over the column of rafter length numbers below. You cannot rely on the roof deck and wall top plate to provide beam action as there is no way of knowing whether or not they are adequately built to provide beam action in the plane of the roof. Let's figure the rafter length for an 18 in 12 roof. The industry demands generative design. On the framing square blade face, using the COMMON RAFTER LENGTH PER FOOT RUN line in the table, look along the blade under the inch number 18 we see 21.63. to the outer edge of the wall top plate. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. spanned by the rafter from the center of the ridge to the outer edge of Each number gives the unit Have a look they span a few years. The issue is that the ICs are over 2 for the rafters and deflecting over 3" at midspan. A concrete slab was casted over 9m span beam, and later it was found the slab projection of 0.8m long with ~5m width was required to rest the window components. The interesting thing though is that I modeled the original condition with a roller, with the rafter tie at the top of the wall, and the thrust reaction was 1.086 kips, ... Lastly, the model gives me errors for le/d>50 for the rafters unless I reduce unbraced length. ISBN 0-8069-8101-6. tables give the length of the rafter per foot of horizontal run. New with overhang Rafter Length = 12 units x 21.63" per unit = 259.56" or, dividing that by 12"/ ft we get 21.63 ft or better, in inches, Subtract 1/2 of Ridge Board Thickness when Laying out the Rafter's Birds' Mouth Cut. The rafter tables allow you to calculate the length of a rafter by I am not yet checking deflection in the calcs. Watch out: there are two details yet to consider in the actual total rafter length, Finally let's look at a common rafter length for a very low slope Increasing automotive design complexity demands a shift away from legacy automotive design flows. Continue reading at FRAMING SQUARE for BIRDS MOUTH CUT or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. This ebook covers basic tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. The deflection of the rafters is around .35". See roof sheet manufacturers for spans on roof sheets. I can add a simpson roof tie since those are capable of transferring some lateral load. Definition of Rafter Span: the rafter SPAN is the same as the rafter's run: the total horizontal distance (parallel to the ground) below the rafter. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Definition: a mid-span rafter tie is a horizontal reinforcement member connected to a pair of opposing rafters and located in the middle of the rafter's span or run. In Structural Engineering, the name “truss” describes a triangular design.A joint framed structure that sustained the inclined, vertical or horizontal loads.A truss consist of angles, channels, plates and eye bars. Under wind loads that may not be the case but I don't think all of it will go to one wall. The difference in length of sequential jack By about 3/4" - and you'll be embarrassed. The walls I'm dealing with are 2x4 walls. A hip or valley rafter will be 18" long per from ridge to the outer face of the wall top plate as follows: Common Rafter Table No. Page Lumber, Poughkeepsie NY) used to shout at me when he caught me sorting through my 2x's to pick the straight ones before loading them up on my truck. Definition of Rafter Run: You can see that for any rafter, the rafter's RUN is the horizontal distance pier synonyms, pier pronunciation, pier translation, English dictionary definition of pier. Really? It also looks like the tension tie is too high. The slope is the same as the pitch. screws or through bolts? ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also, Decks and Porches, the JLC Guide to, Best Practices for Outdoor Spaces, Steve Bliss (Editor), The Journal of Light Construction, Williston VT, 2010 ISBN 10: 1-928580-42-4, ISBN 13: 978-1-928580-42-3, available from Amazon.com. I have corrected an error in the original drawing that cited the horizontal run as 6' - wrong, the run is 8' as shown in the example. Definition of Rafter Line Length: Typical carpentry texts refer to the rafter's actual LENGTH from the rafter's plumb-cut face abutting the ridge board to the rafter's bird's mouth plumb cut as the rafter line length. Take a look along the FRONT of your framing square BLADE and read the inch-scale at the top edge of the blade. example to get eights) to get 2.4 eighths - or about 2/8 or about 1/4 " Definition of Roof Span: In a symmetrical roof such as the gable roof shown above, the total building width between the outer faces of the walls or wall top plates is the total area spanned by the roof or total horizontal span. I think Henry Page must have been to some of my job sites. ...particularly if hurricane ties are installed at the rafter to wall connection, no? I ran some hand calcs which I posted last week. Trussed rafter manufacturers would normally provide such bracing information with their trussed rafter supply although it is the author’s experience that such bracing is often omitted. By direct counting, there are 15 stinups per span, if there are 12 girders; multiply: . Copyright © 1998-2021 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. New electrical systems and wiring harness engineering solutions implement automation, facilitate collaboration and accelerate verification. screws or through bolts? See attached screenshot. Academia.edu is a platform for academics to share research papers. will be 26.81" long on a 6/12 slope roof. Chapter 2 covers cybersecurity and answers the question: How do you secure your files and documents? By joining you are opting in to receive e-mail. Find the number "7" - (inches). The diagram below illustrates these principles of non standard bracing. Synonyms for guide include escort, chaperon, chaperone, usher, attendant, convoy, pilot, companion, guard and torchbearer. This article series gives clear examples just about every possible way to figure out any or all roof dimensions and measurements expressing the roof area, width, length, slope, rise, run, and unit rise in inches per foot. But not to worry, there's not many architects who even know how to use a tape measure while doubled over and scrunched up on a scaffold under the roof eaves. By definition, Plain Concrete is an artificial stone as a result of mixing cement, fine aggregates, ... 1. Let's look at a 6/12 roof for some rafter lengths. I don’t want to disturb the beam and slab by chipping of the concrete as the span is quite long and it is critical. x 0.025 ft = 0.3 " or 3/10 of an inch. I'm trying to run some calcs on an existing roof that has 2x6 rafters @ 16". A lath or slat is a thin, narrow strip of straight-grained wood used under roof shingles or tiles, on lath and plaster walls and ceilings to hold plaster, and in lattice and trellis work.. Lath has expanded to mean any type of backing material for plaster.
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