The above spans are based on American Softwood Lumber Since the example house we are designing for is 12 feet wide, we need to find, in the floor joist span table, a joist size and centering that can span 12' or wider. But most will display: The stamp above indicates in the triangle that the wood is Douglas Fir (D FIR). Now we'll look at how to read these tables. Calculated allowable properties are based upon AISI S100-07, North American Specification for the Design of Cold-Formed Steel Structural Members. Continuing on from Part 1: Residential Structural Design Vertical Structural Forces, we were about to start learning about floor joist span tables. Nordic I-joists provide a first-rate solution for residential, multiresidential, and commercial construction projects. Tables listing Maximum Spans for Southern Pine joists and rafters are detailed below. These tables can also be used to determine deck joist span. Floor Joist Span Tables for various Sizes and Species of Wood Joist span table - Use these tables to determine floor joist spans based on grade of lumber, size of joist, floor joist spacing, and a live load of 30 lbs/ft 2 or 40 lbs/ft 2. The picture below shows a plan view, that means looking straight down from above the house. (on center). 2.) Find a span that meets or exceeds the required clear span. To learn about designing with beam span tables, continue on with the next part of Residential Structural Design: Part 3: Designing with Wood Beam Span Tables. This span table is to the format and methodology given in BS 5268-7.1. Read the corresponding joist series, depth and spacing. 1 and No.2 Grade of Hemlock-Fir, Table valid for No. No part of this web site may be reproduced or copied without written permission. dead load (weight of structure and fixed loads) 10 lbs/ft 2. Live loads of 40 psf assumed. 1 and No. The maximum span is measured o.c. of bearings and is based on uniformly loaded joists. Span Tables F7 Rafters – 30mm 11 F7 Rafters – 42mm 14 Verandah Beams F7 – 42mm – Sheet Roof 17 Verandah Beams F7 – 42mm – Tile Roof 20 Verandah Beams GL8 – Sheet Roof 21 Verandah Beams GL8 – Tile Roof 24 Ridge Beams F7 – 42mm – Sheet Roof 25 Ridge Beams F7 – 42mm – Tile Roof 28 Internal Floor Joists F7 – 42mm 30 Joists of 35 mm or 38 mm width are only suitable where proprietary deck fi xings are used which a fi xed to the side of joists. Interactive Span Table If you are considering using JJI-Joists in your construction project, use our Interactive Span Table to quickly identify the size and specification that you will require. for 2-grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load, which is typical of normal residential construction: Builders can adjust their choice of lumber size and spacing depending on circumstances. Ceiling Joist Span Use this table to determine the maximum lengths of ceiling joists based on species of lumber, joist spacing, and joist size. the joists. Joists crippled over supports shall be considered as single span joists. This application will specify a list of acceptable JJI-Joists once you enter your support conditions, load case and clear span. 2. For example, in the joist span table below, the highlighted cell was obtained from Web crippling capacity is based on a minimum bearing length of 3.5". Copyright 2009-2018 The-House-Plans-Guide.com, Table valid for No. SPAN TABLES FOR JOISTS AND RAFTERS 3 AMERICAN WOOD COUNCIL Table 9.1 Required compression perpendicular to grain design values (F c⊥) in pounds per square inch for simple span joists and rafters with uniform load. CAUTION: For floor systems that require both simple span and continuous span joists, View Joist & Rafter Tables The REDfigures in this load table are the nominal LIVE loads per linear foot of joist which will produce an approxi-mate deflection of 1/360 of the span. Total Load deflection is limited to L/240. The floor joist spacing is the distance between the centers of any two installed joists. For two equal spans, the listed span is the center-to-center distance from either end to the center support,… Other (more complex) load condition spans can be determined with our free Hyne Timber Design 7.5 software. Other common designations are: The stamp shown above indicates the lumber grade is standard or better (STAND & BTR) this is the same as number 3 or stud. As a general rule - floorboards should be a minimum 16mm thick for joist centres up to 500mm and 19mm minimum for centres up to 600mm. Live load is weight of furniture, wind, snow and more.. 1 psf (lb f /ft 2) = 47.88 N/m 2; 1 ft = 0.3048 m 5. FLOOR BEAM TABLE Now, let's make the house wider so that it is necessary to have a center support for the floor joists. In general, all lumber is stamped near the end of the lumber piece by the manufacturer. 30 lbs/ft2 or 40 lbs/ft2. Click on a span to generate a full calculation (you can adjust the exact span). When choosing a joist spacing, check that your floorboards (or sheets) are strong enough to span over the width chosen. Find a span that meets or exceeds the required clear span. You must consult your local floor joist span tables to ensure that the joist sizing is correct for your area. Do not install them upside down. Maximum deflection is limited by L/360 or L/480 under live load. So the house dimensions will now be 24' X 13'. To manufacture our EWP products, we use fast growing, under-utilized and less expensive wood species; therefore, large old growth trees are preserved. Joist sizes can be found in the span tables 50 in as1684. The approximate DEAD load of the joists may be determined from the weights per linear foot shown in the tables. Select the Simple Span or Continuous Span table, as required. Maximum deflection is limited by L/360 or L/480 under live load. The narrow double lines show the floor joist themselves. Spans in this table were derived from the IRC Table R502.3.1(2) Design Criteria: Hem–Fir # 2 joists with a live/dead load of 40/10 psf. Dead load deflection is limited to L/360 and total load deflection is limited to L/240. These tables can also be used to determine deck joist span. Max. Live Load deflection is limited to L/480 or L/360 as indicated in the tables above. Additional dead loads are due to various combinations of construction materials. Floor Truss Span Tables Alpine Engineered Products 17 These allowable spans are based on NDS 91. Important Notes on Span Tables: Spans are based on uniformly loaded joists and include allowances for repetitive use members. To use the joist span calculator below, first select the species of lumber you will use for your construction project from the drop-down list. Don't worry, you won't need to do a lot of calculations in determining the size and placement of the structural framing within your house design. Reading the table, you'll see that 2 X 8s installed 16" apart on center can span 12'4". Bearing Length, in. Spans are based on continuous lateral support of the compression flange. grade of #2, and are spaced 24" apart can have a maximum span of 10 feet Table Notes Spans are based upon continuous support of compression flange over the full length of the joist. FLOOR JOISTS SUITABLE FOR … For simple construction, such as domestic construction, this can be determined from span table supplements in AS1684.2 and AS1684.3. For more precise spans you will need to consult span tables. Spacing of trusses are center to center (in inches). 2 Grade of Douglas fir are indicated below. F:\\gris\users\BUILDING\2008 REVISED DOCS\009 CBC Handout Span charts.doc 1 of 10 (reprinted from CBC) (Revised 01-9-08) EXCERPTS FROM TABLE 2308.8(2) C.B.C. For a member to be in continuous span the smallest span must be greater than 80% of the other span… Span Tables below illustrate common combinations of the multiple variables available. The minimum bearing length is 1 ½”, spans values in bold indicate that web stiffeners are required at the OSB end panel. The content on this page will explain how to interpret the results from the calculator. Spans in this table were derived from the IRC Table R502.3.1(2) Design Criteria: Hem–Fir # 2 joists with a live/dead load of 40/10 psf. for 2-grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load, which is typical of normal residential construction: For each application, a PDF download is available. Top Chord Home, Copyright © 2009-2021 www.mycarpentry.com | Privacy Policy. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on-center (o.c.) 2. The maximum span is measured o.c. Performance. If you are just starting out, you might want to start at our previous page, residential structural design page which explains basic house structure. Due to variations in timber grades, load sets, support conditions and bearing widths, the tables are not suitable as a design tool. also available for the Android OS. Joist span table - Use these tables to determine floor joist spans based Span Tables below illustrate common combinations of the multiple variables available. If you are using a very small screen or smart phone, rotate your device to landscape view to use the calculator below. Next use the buttons in the table to select the maximum length in feet (or metres in brackets) that your floor joists must span. 1 & 2 2X8 2X10 2X12 Subfloor Installation Joist Spacing Joist Spacing Joist Spacing Thickness 12” 16” 12” 16” 12” 16” A 12-2 11-7 14-4 13-8 16-5 15-7 5/8 B 13-6 12-10 15-10 15-1 18-1 17-3 C 13-9 12-10 15-10 14-10 17-10 16-7 All TrimJoist® products are cambered to compensate for dead load deflections. Table assumes a maximum flooring mass of 40kg/m2. Before jumping into the span tables, let's first consider wood species and wood grades. BCI ® Joists are specially constructed I-joists with flanges made from strong VERSA-LAM ® laminated veneer lumber with oriented stranded board webs and approved waterproof structural … So our house would look like the picture below (with all floor joists 2" X 8"). So our house would look like the picture below (with all floor joists 2" X 8"). Multiple spans are based on the longest span. See our Design Your Own House tutorial site map to go through the tutorial in order, or to jump around it as it suits you. Common lumber grade designations include: These designations and numbers will become important when you are reading your structural tables since the strength of a wood depends on its designations. The minimum bearing length is 1 ½”, spans values in bold indicate that web stiffeners are required at the OSB end panel. 1. Looking at this table you will see there is a choice in the size of floor joist (2 X 6, 2 X 8, 2 X 10 or 2 X 12) and there is a choice in the joist spacing (12", 16" or 14"). ** Note: The data in the floor joist span tables above 1 and No. The following Easi – Joist span tables are to be used as a basic guide to achievable joist span for given depth and spacing, and should be used for estimating of feasibility only. FLOOR BEAM TABLE Maximum floor joist span for No. The minimum available TradeReady® rim … This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on-center (o.c.) teel Joist Span Tables are to be utilized in conjunction with the notes below. Spacing of trusses are center to center (in inches). Floor joist span tables for surveyors – Floor construction Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to … Table Notes Spans are based upon continuous support of compression flange over the full length of the joist. Rafter spans can be extended slightly beyond what the rafter tables suggest, when there is a cantelever extending beyond the supporting wall. RFPI Joists are an inherently green product because they are a more efficient use of raw materials. The spans are based on simple-span joists. (or Standard & Better). Floor Span Tables: 40 psf Live Load and 10 psf Dead Load TO USE: 1. This table is for residential construction only and is meant only for the purposes of initial estimation. Read the corresponding joist series, depth and spacing. The shortest span shall not be less than 40% of the longest span. Reading the table, you'll see that 2 X 8s installed 16" apart on center can span 12'4". CAUTION: For floor systems that require both simple span and continuous span joists, For two equal spans, the listed span is the center-to-center distance from either end to the center support,… Max. Span Tables for Domestic Floor Joists (to BS 5268-7.1) Note: Our floor joist span tables are based on loadings given in the newer, amended version of BS 6399-1. The spans are based on simple-span joists. Floor Truss Span Tables Alpine Engineered Products 17 These allowable spans are based on NDS 91. Leave joist span table and return of bearings and is based on uniformly loaded joists. Maximum spans are shown in 6 inch (150mm) increments. Listed are 46 tables based on common loading conditions for floor joists, ceiling joists and rafters. Architectural Drawing and Light Construction by Edward J. Muller. These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards. Notes: Rafter or uss Spacing W Lintel Span Sheet Roofing Tiled Roofing Roof Load Width (RLW) mm 1500 2100 4500 7500 1500 2100 4500 7500 MAXIMUM SPAN OF LINTEL (mm) Basic Lumber Design Values are F =2000 psi F =1100 psi F =2000 psi E=1,800,000 psi Duration Of Load = 1.00. The table below shows the maximum span for a floor joist with the following designations: The table excerpt above is simply a sample and may not be valid for your region. dead load (weight of structure and fixed loads) 10 lbs/ft 2. Floor Joist Span Use this table to determine the maximum lengths of floor joists based on species of lumber, joist spacing, and joist size. Joists & Rafters Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. Important Notes on Span Tables: Spans are based on uniformly loaded joists and include allowances for repetitive use members. Additional dead loads are due to various combinations of construction materials. On this page we will explain how to design with floor joist span tables. The house will have a gable roof and will be framed with wood studs. on grade of lumber, size of joist, floor joist spacing, and a live load of 2. 1 and No.2 Grade of Spruce-Pine-Fir, Joist Dimensions, inches x inches (mm x mm), Table valid for No. From a three-dimensional perspective, the floor joist framing would look like this: Keep in mind the span table above shows just the allowable spans for Douglas fir or larch, there are different tables for all the construction lumber species. 2 Grade of Douglas fir are indicated below. 1 and No.2 Grade of Northern Species lumber, The wood grade - could be a number or description, The wood association of which the lumber manufacturer is a member, How the wood was seasoned - this will give an indication of the moisture content, The mill identification—indicated by name or mill number, N. Species (red cedar, certain pines, balsam and poplars), No. Do not install them upside down. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. Since the example house we are designing for is 12 feet wide, we need to find, in the floor joist span table, a joist size and centering that can span 12' or wider. True floor joist span calculations can only be made by a structural engineer or contractor. also available for the Android OS. standard sizes. conditions, etc. Calculated allowable properties are based upon AISI S100-07, North American Specification for the Design of Cold-Formed Steel Structural Members. Top Chord Uniform Floor Load (PLF) Tables 10-11 Uniform Roof Load (PLF) Tables 12-13 Roof Span Tables: Low Pitch (6:12 or less) 14-15 Roof Span Tables: High Pitch (6:12 to 12:12) 16-17 Load-Bearing Cantilever Tables … DOL 1.00; L / 360. Let's expand our house beyond that 17'2" span capability to 24 feet wide. You will however, need to become familiar with reading your local floor joist span tables for floor beams, floor joists, window and door lintels, ceiling joists, roof joists, roof rafters, and roof ridge beams, as well as the sizing and spacing of wood studs tables. FLOOR JOIST SPANS FOR COMMON LUMBER SPECIES (Residential Living Areas, Live Load = 40 psf, L/ ∆ = 360) DEAD LOAD - 10 psf DEAD LOAD - 20 psf 2x6 2x8 2x10 2x12 2x6 2x8 2x10 2x12 Basic Lumber Design Values are F =2000 psi F =1100 psi F =2000 psi E=1,800,000 psi Duration Of Load = 1.00. The widest span in the floor joist span table in Part 2 of this tutorial module showed that floor joists can span 17'2" if they are 2 X 12s spaced 12" o.c. Uniform Floor Load (PLF) Tables 10-11 Uniform Roof Load (PLF) Tables 12-13 Roof Span Tables: Low Pitch (6:12 or less) 14-15 Roof Span Tables: High Pitch (6:12 to 12:12) 16-17 Load-Bearing Cantilever Tables … conditions, etc. All TrimJoist® products are cambered to compensate for dead load deflections. The information displayed varies between wood associations. 3. Live loads of 40 psf assumed. 4. Live load is weight of furniture, wind, snow and more.. 1 psf (lb f /ft 2) = 47.88 N/m 2; 1 ft = 0.3048 m Span Calculator for Wood Joists and Rafters also available for the Android OS. - 3 inches (10-3) if designing for a live load of 40 lbs/ft2. Spans do not reflect any … Illegal Internet copies will be detected by Copyscape. These spans were calculated using our floor joist calculation engine. At the bottom of this page you'll find a joist span calculator. Engineered Wood Products (EWP) Span and Size Charts for BCI ® Joists. 1 and No.2 Grade of Douglas fir and larch, Table valid for No. Please note our Posi-Joist Span Table is an indicative tool and full details should be confirmed with your chosen fabricator. 3 / Stud / Stand & Btr. These 46 tables are based upon design values for visually graded Southern Pine dimension lumber that became effective June 1, 2013. DOL 1.00; L / 360. The stamp displays several types of information. The outer gray walls are the concrete foundation walls which support the floor joists. 3. 4. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. Data taken from CMHC Wood-Frame House Construction Tables Span Calculator for Wood Joists and Rafters also available for the Android OS. shows that 2" x 8"  Southern Yellow Pine joists, that have a See the image below for an example of joists spaced 16" on center (16" o.c.). Select the Simple Span or Continuous Span table, as required. Floor Joists – Living Quarters Span Tables Hem-Fir No. Joists Design Properties 6 Floor Span and Load Tables 7–8 Tips for Preventing Floor Noise 8 Allowable Holes 9 Cantilevers 10–11 Roof Span and Load Tables 12–13 Framing Connectors 14–15 SECTION 2: ®18"–24" TJI Joists. S pan Table Notes: 1.) Floor Span Tables: 40 psf Live Load and 10 psf Dead Load TO USE: 1. The values displayed in the resulting table will show three possible joist dimensions and spacings depending on the restraining method used. 3. Let's start with a simple, very small house 12 feet wide by 13 feet long. Maximum floor joist span for No. IJ-2 Span to Depth Ratio: IJ-3 Slope Cut Reinforcement: IJ-5 Joist to Hip Beam Connection: IJ-6 2x Ceiling Joist Connection: IJ-7 Drywall Storage: IJ-8 Glue Nail Floor Composite Action: IJ-9 BCI® Header Table: IJ-10 Rafter Cut Length Table: IJ-11 Fire Exposure: IJ-12 Design Live Loads for Residential Floors: IJ-13 Multiple Ply BCI® / AJS® Member Design Properties 16 Floor Span and Load Tables 17 Allowable Holes 18 Roof Span and Load Tables 19 Cantilevers 20–21 =1100 psi F =2000 psi E=1,800,000 psi Duration of floor joist span tables = 1.00 the outer gray are. Foot shown in the resulting table will show three possible joist dimensions, inches X inches ( mm mm... Narrow double lines show the floor joists, the joists may be reproduced copied. Jji-Joists once you enter your support conditions, load case and clear.. Three possible joist dimensions and spacings depending on the restraining method used reproduced. Flange over the full length of the compression flange that web stiffeners are required at the OSB end.! We were about to start learning about floor joist spacing is the distance between the centers of any installed! The joist, 2013 fixed loads ) 10 lbs/ft 2 maximum span tables Design with floor joist for. Tables and are calculated floor joist span tables the format and methodology given in BS 5268-7.1 conditions, load case and clear.. Of Southern Pine lumber in sizes 2×4 thru 2×12 below ( with all floor joists ceiling... Image below for an example of joists spaced 16 '' o.c. ) because... 2 '' X 8 '' ) Douglas Fir and larch, table valid for.! Start learning about floor joist calculation engine tables Hem-Fir No allowable spans are based on uniformly loaded joists Rafters! Pine lumber in sizes 2×4 thru 2×12 narrow double lines show the floor joist calculator... Determine deck joist span calculator for wood joists and include allowances for repetitive Members... Joists, ceiling joists and Rafters installed joists view, that means looking straight down from the... Tables for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12 important on! Engineered Products 17 these allowable spans are shown in the resulting table will show possible... Multiple variables available support of compression flange over the full length of 3.5 '' a. Spans can be determined with our free Hyne Timber Design 7.5 software joist engine... Allowable properties are based upon continuous support of compression flange total load deflection is limited to L/240 North... When choosing a joist spacing is the distance between the centers of any two installed joists determined... Dead loads are due to various combinations of construction materials graded Southern Pine dimension that... Rafters also available for the Android OS under live load without written permission for visually graded Pine! Joist sizing is correct for your area screen or smart phone, rotate your device landscape... Tables below illustrate common combinations of construction materials used to determine deck joist span tables the end of the flange! Conservative than span tables and are calculated to the format and methodology given in BS 5268-7.1. ) other if... In general, all lumber is stamped near the end of the joists, Copyright 2009-2021! Wood is Douglas Fir and larch, table valid for No conditions, load case clear. Piece by the manufacturer are slightly more conservative than span tables: psf. Rafters Simplified maximum span tables, let 's expand our house would look like the picture below ( all! Small screen or smart phone, rotate your device to landscape view to use the calculator below American lumber. Enter your support conditions, load case and clear span concrete foundation walls which support the floor span! Forces, we were about to start learning about floor joist sizes for joists spaced at 16 inches and inches! Cmhc Wood-Frame house construction tables Notes: 1 the picture below ( with all floor joists – Living Quarters tables... Spans do not reflect any … floor joists triangle that the wood is Douglas Fir D! House would look like the picture below ( with all floor joists 2 '' X 8 ''.! Maximum deflection is limited to L/480 or L/360 as indicated in the triangle that the joist of other span. The exact span ) will have a gable roof and will be framed with wood studs, multiresidential, commercial... Specification for the Design of Cold-Formed Steel Structural Members, all lumber is stamped near the of... Need to consult span tables from other sources if those do not the... Joists 2 '' X 8 '' ) displayed in the resulting table will three... The distance between the centers of any two installed joists a joist spacing is the distance the. Lateral support of the lumber piece by the manufacturer of raw materials dead loads due..., this can be found in the tables above include allowances for use! General, all lumber is stamped near the end of the lumber piece the. Engineered Products 17 these allowable spans are based upon continuous support of compression flange over the length. The longest span that 17 ' 2 '' X 8 '' ) allowable properties based... Content on this page will explain how to read these tables can also be to... '' ) Part of this web site may be determined with our free Hyne Timber Design 7.5 software JJI-Joists. 46 tables based on common loading conditions for floor systems that require both simple span continuous! Product because they are a more efficient use of raw materials precise spans you will need to consult span Hem-Fir... Design values are F =2000 psi E=1,800,000 psi Duration of load =.. Rotate your device to landscape view to use: 1 Copyright © 2009-2021 www.mycarpentry.com | Privacy.! Spacing of trusses are center to center ( in inches ) an example joists... Now, let 's expand our house beyond that 17 ' 2 '' X ''. Read these tables exceeds the required clear span outer gray walls are the foundation... Or copied without written permission spans are based upon AISI S100-07, North Specification... Walls are the concrete foundation walls which support the floor joist spacing, check your! Lumber in sizes 2×4 thru 2×12 this application will specify a list acceptable! Are an inherently green product because they are a more efficient use of raw materials more precise you., table valid for No of Douglas Fir and larch, table valid for No compression flange Home! For the Design of Cold-Formed Steel Structural Members, North American Specification the... The manufacturer L/480 or L/360 as indicated in the tables above standard sizes deflection is limited L/360. Bearings and is based on uniformly loaded joists and Rafters also available for the Design Cold-Formed! 4 '' tables and are calculated to the same standards flange over the full length the. The content on this page you 'll see that 2 X 8s installed 16 '' on... Shown in 6 inch ( 150mm ) increments of construction materials in general all... If those do not include the amended guidance upon AISI S100-07, North American Specification for the Android OS exact... Hemlock-Fir, table valid for No wide by 13 feet long sources if those do not reflect any floor! If those do not include the amended guidance means that some values are more... Web crippling capacity is based on uniformly loaded joists and Rafters for selected and. Installed joists of other industry-standard span tables below illustrate common combinations of the compression flange over the length. Truss span tables, let 's first consider wood species and wood grades, we were about to floor joist span tables. 6 inch ( 150mm ) increments in sizes 2×4 thru 2×12 maximum deflection is to! Is meant only for the Design of Cold-Formed Steel Structural Members gives minimum floor sizes. Means looking straight down from above the house will have a center for!, table valid for No will be framed with wood studs device to landscape view to use the.! In as1684 bold indicate that web stiffeners are required at the bottom of page... Both simple span or continuous span joists, ceiling joists and Rafters domestic construction, this be... Restraining method used spacings depending on the restraining method used length is 1 ½ ”, spans values bold! The triangle that the wood is Douglas Fir ( D Fir ) L/480 live! We will explain how to read these tables can also be used determine... Duration of load = 1.00 near the end of the longest span and. Due to various combinations of the joist the approximate dead load ( of... Of raw materials 50 in as1684 which support the floor joist span table, as required means looking straight from... To landscape view to use the calculator joists, ceiling joists and include allowances for use... % of the multiple variables available values displayed in the span tables: spans based! '' span capability to 24 feet wide loads ) 10 lbs/ft 2 's expand our house beyond that 17 2. Will explain how to read these tables house beyond that 17 ' 2 '' X ''... Wood studs under live load and 10 psf dead load deflections ( in inches ) in.... Southern Pine dimension lumber that became effective June 1, 2013 of Cold-Formed Steel Structural Members include for! Pdf download is available and total load deflection is limited to L/480 or L/360 as indicated in triangle! Each application, a PDF download is available 'll see that 2 X installed! Engineered Products 17 these allowable spans are based upon continuous support of the longest span image below an... Tables: spans are based upon continuous support of compression flange over the full of. Use floor joist span tables 1 www.mycarpentry.com | Privacy Policy: spans are based on continuous lateral of! As required Vertical Structural Forces, we were about to start learning about floor joist sizes can be from! Are using a very small screen or smart phone, rotate your to!, spans values in bold indicate that web stiffeners are required at the OSB end panel depending on the method...