.5 Modulus of Elasticity) (Roof slope not steeper than three units vertical on 12 units horizontal) NOMINAL SIZE O.C. 20 PSF LL LIMITED STORAGE GYPSUM CEILING 10 PSF LL NO STORAGE GYPSUM CEILING 12 9-8 12-2 2 X 4 16 8-9 11-0 24 7-8 9-8 12 15-2 19- R802.4 Allowable Ceiling Joist Spans. Spans for ceiling joists shall be in accordance with Tables R802.4 (1) and R802.4 (2). For other grades and species and for other loading conditions, refer to the AF&PA; Span Tables for Joists and Rafters. Check sources for availability of lumber in lengths greater than 20 feet This ceiling joist span table is based on the 2012 IRC for uninhabitable attics with limited storage. It covers #2 common lumber species and sizes at 20 pounds per square foot load. Although 2 x 4's are included in the official table, they are not listed because it is never advised to use them. 2 x 12's are not listed because you can span pretty much whatever you want
Maximum spans are inside to inside of bearings Lumber Span Tables for Spruce-Pine-Fir South (SPFs)** Ceiling Joists - 20 psf Live Load, 10 psf Dead Load, L/240 Deflection (Limited Attic Storage) Note: Deflection is limited to the span in inches divided by 360 for live load only. Maximum spans are inside to inside of bearings Allowable Ceiling Spans - Deflection Limit L/360. Member. Fy (ksi) 4 psf. 6 psf. 13 psf. Lateral Support of Compression Flange. Lateral Support of Compression Flange. Lateral Support of Compression Flange Allowable limiting heights & spans Contact ClarkDietrich Technical Services at (888) 437-3244 for any questions on tables below. Interior Framing Use iProSTUD in ClarkDietrich iTools to quickly lookup the interior framing system you need. ProSTUD Limiting Height Charts (NEW) ClarkDietrich iTools - Structural Stud Lookup Tool Interior Wall Heights w/ Structural Framing-11-17-2 Attic without storage: Use Table R802.4 (1) Ceiling Joist Spacing: 12 inches. Species and Grade: Hem-fir #2. Lumber Size used: 2×8. Now lets find the maximum allowable span for a 2×8 member given the above scenario: Therefore given the above example, the maximum allowable span for a 2×8 member is 26′-0″
Tables listing Maximum Spans for Southern Pine joists and rafters are detailed below. These 46 tables are based upon design values for visually graded Southern Pine dimension lumber that became effective June 1, 2013. For each application, a PDF download is available. Also see Using These Tables and five Examples showing how to read the table. Ceiling Span Tables Ceiling Span Table Notes 1. For unbraced sections, allowable moment is based on AISI S100-07 with S2-10 Supplement, section C3.1.2 with weak axis and torsional unbraced length assumed to be the listed span (completely unbraced). For mid-span braced sections, allowable moment based on AISI S100-07 Specification section C3.1. This span table is to the format and methodology given in BS 5268-7.3. These spans were calculated using our ceiling joist calculation engine. These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards 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 . This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance d = out-to-out depth of the joist in inches El = value from table above For ®TJI® 110, 210, 230, and 360 Joists Δ = +22.5 wL 4 2 El 2.67 wL 4 d x 10 5 For TJI 560 Joists Δ = +22.5 wL 2 El 2.29 wL d x 10 General Notes Design reaction includes all loads on the joist. Design shear is computed a
4.For multiple-span joists: End spans must be at least 40% of the adjacent span. Spans shown above cover a broad range of applications. It may be possible to exceed these spans by analyzing a speciﬁc application with FASTBeam® selection software. 5.For loading other than that shown above, refer to Uniform Load Tables, use FASTBea Span Tables for Douglas Fir-Larch Lumber. 2019 California Building Code, Section 2308. 2019 Residential Building Code, R502, R802 . Rafters (L/∆=240), Ceiling Joists (L/∆=240), Floor Joists (L/∆=360) Table 2308.7.2(2), Table 2308.7.1(1), Table 2308.4.2.1(2 D: Bridging and Strapping and Joists Glued to Subfloor or Bridging and Ceiling Finish to Underside of Joists and Joists Glued to Subfloor. E: Bridging Only. Information compiled for your convenience from The Span Book Canadian Wood Council 2009 Edition. For expanded options refer to The Span Book 2009 Edition
SPAN TABLES Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. They also tell you what the maximum spacing should be between each section or timber member SIZE OF JOISTS (mm) CLEAR SPAN C16 JOIST (M) CLEAR SPAN C24 JOIST (M) 47 X 95 47 X 120 47 X 145 47 X 170 47 X 195 47 X. Spans are based on a composite floor with glued-nailed sheathing meeting the requirements for APA Rated Sheathing or APA Rated STURD-I-FLOOR conforming to PRP-108, PS 1, or PS 2 with a minimum thickness of 19/32 inch (40/20 or 20 oc) for a joist spacing of 19.2 inches or less, or 23/32 inc These span tables are calculated based on MOE and Fb values. In addition Fc and Fv are included as a consideration for selec-tion of joist and rafters. Extreme Fiber Stress in Bending - Fb (Fig. 1) When loads are applied, structural members bend, producing tension in the fibers along the faces farthest from the applied load and com
Framing Corrections If joists are out of alignment,38 mm x 140 mm (2 x 6) leveling plates attached perpendicular to and across top of ceiling joists may be used. Toe-nailing into joists pulls framing into true horizontal alignment and ensures a smooth, level ceiling surface. Bowed or warped studs i CHAPTER 8 ROOF-CEILING CONSTRUCTION. First Version: Aug 2017 All Codes; clear. Legend Information Code Sections My Notes 2018 International Residential Code (IRC) COPYRIGHT. PREFACE. EFFECTIVE USE OF THE INTERNATIONAL RESIDENTIAL CODE. arrow_right. CHAPTER 1 SCOPE AND ADMINISTRATION.
spans in floors, ceilings and roofs. LP SolidStart I-JOISTS ARE A BUILDING MATERIAL WITH BUILT-IN ENVIRONMENTAL BENEFITS • Made of engineered wood substrate, a renewable resource with a reduced environmental impact • Raw material procurement targets small, fast growing trees • In LP's manufacturing process, no part of the log goe Pro STUD ® ALLOWABLE CEILING SPANS Pro STUD ALLOWABLE CEILING SPANS Section Fy (ksi) 4psf Lateral Support of Compression Flange 6psf Lateral Support of Compression Flange Unsupported joist spacing (in) o.c. Mid-span joist spacing (in) o.c. Unsupported joist spacing (in) o.c. Mid-span joist spacing (in) o.c. 12 16 24 12 16 24 12 16 24 12 16 2 Ceiling Joist - Top Flange Braced 48 O.C. *If stud height exceeds table, web stiffeners are required. A web stiffener is a 6 length of stud secured to the stud web at both ends of the stud, with four (4) #8 pan-head screws. Size (in.) Gauge Joist Spacing (in.) 12 16 24 Allowable Single Span (ft.-in.) 3 -5/8 20 10 89 Maximum clear span for ceiling joist- w/ gypsum clg. 10lbs live 5 lbs dead (no attic storage) 12 O.C. 16 O.C. Maximum clear span for rafters w/ gypsum ceiling- standard roof covering. 20lbs live 10 lbs dead . Maximum clear span for floor joist . 40lbs live 10 lbs dead (living areas) 12 O.C. 16 O.C SPAN TABLES CITY OF POWAY COMMUNITY DEVELOPMENT DEPARTMENT 13325 CIVIC CENTER DRIVE, POWAY, CA 92064 (858) 668-4645 Lumber Grade Douglas Fir Larch No. 2 ALLOWABLE SPANS*1 (Limited to assumed values and conditions) Floor Joist Ceiling Joist4 Rafter2,3,5 Span Cases Finish or Slope With Plaster Below With Drywall Below With Plaster Below With 6.
IJ-2 Span to Depth Ratio: IJ-3 Slope Cut Reinforcement Table: 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 : IJ-11 Fire Exposure: IJ-12 Design Live Loads for Residential Floors: IJ-13 Multiple Ply BCI® / AJS. Table 1 / Allowable Spans for Floor Joists Allowable Spans for Rafters and Ceiling Joists Lumber Grade Douglas Fir Larch #2 Rafters Rafters Ceiling Joist Asphalt Shingles 1Tile 2Asphalt Shingles Tile Gypsum Board3 Nominal Size Inches Spacing Inches Ceiling not attached to rafters CRC Table R802.5.1(1) Ceiling not attached to rafters CRC Table.
. Peterson, RPE This article is the last in the Foundation's series on lightweight steel framing systems. The use of steel joists for ceiling or floor members is becoming more foot single span joist is (20 ft. x 12 in./ft.)/240, or one inch.. Floor Joist Span Calculator. If you don't have the time to look up the joist span tables, then using a floor joist span calculator can help you determine how far a joist of any species, width, quality, and spacing can span.. This calculator also takes more specific criteria into consideration, such as moisture and species not listed on the IRC span tables b) If the spans are not equal, the largest span is not greater that twice the smallest adjacent span. However if either of the above conditions are not met, use the single span tables for the purpose of obtaining the appropriate size. Spacing Tables, such as those for rafters, floor joists and ceiling joists requir
Secondly, the ceiling joists and end connections will require further consideration if thrust loads from a conventionally framed (rafter) roof system are present. The link below provides additional information and span tables for TJI® Joists in ceiling applications. TB 824 - Ceiling Joist allowable span of ceiling joists that support attics utilized for limited storage or no storage shall be determined in accordance with 780 CMR 5802.4. 5502.3.2 Other Floor Joists. 780 CMR Table 5502.3.1(2) shall be utilized to determine the maximum allowable span of floor joists that support all areas of the building, other tha joists are designed to give you more — longer lengths, easier installation, higher span values, better strength-to-weight ratios, and faster cycle times. TJI ® joists are also available in deeper depths that are suitable for heavier-duty loads, such as those in multi-family structures and light commercial buildings. Use support blocks (6x6.
CHAPTER 8 ROOF-CEILING CONSTRUCTION. First Version: Aug 2017 All Codes; clear. Legend Information Code Sections My Notes 2018 International Residential Code (IRC) COPYRIGHT. PREFACE. EFFECTIVE USE OF THE INTERNATIONAL RESIDENTIAL CODE. arrow_right. CHAPTER 1 SCOPE AND ADMINISTRATION. Span Type: Single Span - Span distance is the INTERNAL measurement between structural supports Basic Loading Data: Flooring + Ceiling 40 kg/m2 OR 65kg/m2; Floor Live Load = 1.5kPa/1.8kN OR 2.0kPa/1.8kN; Standard AS1720.3 Dynamics for 1.0kN Static Load; Min. End Bearing Length = 35m Ceiling joists and rafters shall be nailed to each other in accordance with Table R802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table R602.3(1). Ceiling joists shall be continuous or securely joined in accordance with Table R802.5.1(9) where they meet over interior partitions and are nailed to adjacent. 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 3
Table Notes Ceiling/Soffit Table Notes & Bracing Details Ceiling Joist Lateral Bracing Anchor Brace at End Ceiling Joist Blocking Lateral Bracing 1. Values are for simple span conditions. 2. For unbraced sections, allowable moment is based on the AISI S100 Section C3.1.2 with unbraced length assumed to be the listed span The Floor Joist Count calculator computes the number of joists (joists and end plates) required for a floor or deck based on the dimension of the room or deck and the on-center joist separation. Floor Joist Count Instructions (W) - Enter the width of the floor across the joists (L) - Enter the length of the floor parallel to the joists (oC) - Enter the On-center Separation distance between. d = out-to-out depth of the joist in inches El = value from table above For TJI® 110, 210, 230, and 360 Joists Δ = +22 .5 wL4 2 El 2 .67 wL2 d x 105 For TJI® 560 Joists Δ = +22 .5 wL4 El 2 .29 wL d x 105 Material Weights (Include TJI® weights in dead load calculations— see Design Properties table at left for joist weights The same calculator will reveal that 2x6s are probably a minimum for the ceiling joists. Haldi gave good advice about adding the 2x6s. Install them next to the 2x4's, tack them together so the 2x4 aren't moving and run a couple rows of bridging at 1/3 points in the ceiling joist spans to keep them straight
I Joist Span Calculator. Span tables tutorial 2x6 over a 14 span doityourself span tables for deck joists beams ceiling joist and rafter spans home load opening charts trimjoist 2x6 over a 14 span doityourself. Span Tables Tutorial. Deck Floor Joist Span Chart Cabin Decks Stair Railing. Bci Joists I Joist Span Table Chart The allowable spans in the table in this user guide indicate the allowable clear span for various joist spacings under typical residential uniform ﬂoor loads (40 psf live load and 10 psf dead load) for glued-nailed systems. In addition, ﬂoor sheathing must be ﬁeld glued to the Power Joist ﬂanges using approve . Size of ceiling joist . Spacing between joists . 400mm 450mm 600mm 97 x 47 1.84 1.81 1.74 122 x 47 2.43 2.38 2.27 147 x 47 3.08 3.02 2.87 170 x 47 3.74 3.67 3.46 Table assumes a minimum C16 structural grade timber - not all timber i In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists. For best results, refer to our wood and composite deck joist span table
Joist span tables assume that ceiling and decking is fixed in accordance with the appropriate British Standards. 4. Spans are clear spans i.e. between supports.Minimum end bearing length required is 45mm. 5. The applied live load is 1.5kN/m2 for single occupancy domestic dwellings. 6. Web stiffeners are not required for the spans listed above. Ceiling Joist Span Table Nz. Shamika Irick October 16, 2017 Uncategorized Leave a comment 97 Views. Glulam ridge beam span table elcho span tables veranda rafter fixings getting it steel framing manual joist double span. Glulam Ridge Beam Span Table Elcho Beams Tables Golagoo
Notes to Table A-2: (1) Spans apply only where the floors serve residential areas as described in Table 188.8.131.52., or the uniformly distributed live load on the floor does not exceed that specified for residential areas as described in Table 184.108.40.206. (2) No bridging is assumed for spans for floor joists with concrete topping. Table A-3 Maximum Spans for Ceiling Joists - Attic not Accessible. I would like to know if I can use 2x4's for ceiling joists for a 10' span instead of 2x6's ? I have a garage with a open ceiling height of 16' and I'm building an office 10' by 10' with a ceiling height of 10 feet. The space on top of the ceiling will be used for storage. So what I'm really asking is this Floor Joist Web Stiffener Details 64 Header Loads 65 -66 67 - 70 Web Crippling Conditions 67 SSMA Allowable Web Crippling Loads (lbs) 68 69 Back-to-Back Members (S-Sections) 70 Ceiling Spans 71 - 78 Ceiling/Soffit Table Notes and Bracing Details 71 SSMA Interior Allowable Ceiling/Soffit Spans (S-Sections) - L/240 72 SSMA Interior Allowable. Span tables for floor joists, rafters and ceiling joist are determined using their spacing (centre to centre) to determine their respective spans. Please refer to spacing diagram above each table. CANTILEVER Cantilevered joists have been designed to support a live load of 3.0kPa for balconies Another thing to note is that the roof rafter span tables are limited to the ceiling joists or rafter ties being located at the top plate or within the lower third of the attic space. If the ceiling joist is not located at the top plate but located within the lower third of the attic, a rafter space adjustment factor is applied to the rafter to.
Certificate Of Compliance Jointed Nail Plated Ceiling Joists Structural Timber Products Guide Design With A Difference Plywood Box Beam Span Tables For Detached Housing Construction Next Colosseum Las Vegas Interactive Seating Chart. Related Articles. How To Re Veneer A Table Top. December 27, 2018 The lip lengths for joists with 2.5 and 3 flange widths have been reduced from 0.75 to 0.625. These lip lengths have been adjusted for conformance with the North American Standard for Cold-Formed Steel Framing - Product Data Ceiling Joist Beam Span Table. Posted on November 13, 2020 by Sandra. Timber size for ceiling joist 6 4 8 timber joist spans nhbc jji joists technical manual span tables lumberworx floor beam span tables calculator. 6 4 8 Timber Joist Spans Nhbc Standards 2021 joist must resist force listed in Table 104.5.1. BRIDGING ANGLE SIZE** - (Equal Leg Angles) TABLE 2.6-1b LH - SERIES JOISTS MAXIMUM JOIST SPACING FOR HORIZONTAL BRIDGING SPANS OVER 60 ft. REQUIRE BOLTED DIAGONAL BRIDGING Section Number* 001_168 3/28/07 10:52 AM Page
Where could I find a span chart for a girder for a ceiling only? the situation is the two ends of a tray ceiling, girders span across a room with ceiling joist between no roof load just attic above. but if you check out pages 11 and 12 of this document it will provide the span tables for ceiling joists based upon live loads for the attic. 1. You added below the top of the wall in the comments. So I would lag a rim joist to the studs and use joist hangers. Span will look like this: 2x10 @ 12oc for #2. 2x8 @ 12oc or 2x10 @ 16oc for #1. 2x8 @ 16oc for select. span table. Share In these cases, 2-inch by 10-inch lumber is often used for ceiling joists, although trusses may be more practical. Spans for joists greater than 20 feet that are parallel to the rafters require a 12-inch joist spacing when using 2-inch by 10-inch #2 Douglas and hemlock fir or southern pine, or 16-inch spacing when using 2-inch by 10-inch #2. The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12'-6, ceiling joist 20'-8, rafter 18'-0, deck board 24, deck joist 9'-11, deck beam 8'-3, and 6'-1 as for header. Always check the codes for determining factors or consult a Structural Engineer. In this guide, we'll discuss.
the span. • Minimum end bearing length required is 1 ½. • The adhesive utilized to glue the sheathing to the joists shall comply with standard CAN/CGSB 71.26-M88. • The ceiling shall be a single layer of 1/2 thick gypsum board directly applied to the I-joists. • For multiple spans or load conditions not shown Floor Joist Span Calculator. 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. Next use the buttons in the table to select the maximum length in feet (or metres in brackets) that your floor joists must span The ceiling joist size will depend on whether you will be installing knee braces and purlins or not. Such a ceiling joist you can figure a 10 psf dead load for span tables, but with knee braces, you can't use span tables. The roof dead load depends on your roofing material. For regular asphalt shingles, figure 15psf dead load, much more for tiles An easier solution would be to look up the prescriptive spans from Table R502.5 in the IRC, which can be found free online at codes.iccsafe.org. Or you can use software, some of which is free (Forte by Trus Joist , for example, lets you design using its engineered products, but with the option of using dimensional lumber as well)
The maximum joist spacing you can use will depend on the size and allowable span of your joists. What's the maximum deck joist span? Deck joists have a different maximum span length depending upon the size, spacing, and framing material that you're creating your deck with. Here's a helpful chart covering the most popular wood framing species. L/480 and a total load deflection limit of L/240. For multiple-span applications, the end spans shall be 40% or more of the adjacent span. 2. Spans are based on a composite floor with glued-nailed oriented strand board (OSB) sheathing with a minimum thickness of 5/8 inch. Adhesive shall meet the requirements given in CGBS-71.26 Standard
FLOOR JOIST SPANS #2 SPF TABLE R502.3.1(2) Joist spacing 2X6 2X8 2X10 2X12 16 O.C. 9-4 12-3 15-5 17-10 19.2 O.C. 8-9 11-6 14-1 16-3 24 O.C. 8-1 10-3 12-7 14-7 Header and trimmer joists - double if header more than 4' span Use hangers if header spans more than 6' Lap joists 3 min Rim or band joist Tail joists must be supported. .10.4.1 ceiling joists to parallel rafters, face nail 3-16d rafter to plate, face nail 3-8
This is the ninth video in the series on the Timber Framing Code. This video looks at the ceiling joists and how to work out the span of the joists that you. The maximum span for a No. 1 quality 2×6 floor joist made from southern pine with a maximum load of 40 psf at standard 16-inch spacing is 10 feet 9 inches, according to the International Residential Code. When we break this down, the variables determining floor joist span are joist spacing, load, wood species, and lumber quality R802.3.1 Ceiling joist and rafter connections. Ceiling joists and rafters shall be nailed to each other in accordance with Table R802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table R602.3(1). Ceiling joists shall be continuous or securely joined in accordanc
b) If the spans are not equal, the largest span is not greater that twice the smallest adjacent span. However if either of the above conditions are not met, use the single span tables for the purpose of obtaining the appropriate size. Overhang Span.Sometimes referred to as cantilever, overhang is the distance from the face of the support to the. N1 to C3 DuraGalPlus ® RHS as roof beams - rafters, under purlins, strutting beams, roof battens, ceiling joists DDCM Volume 1 February 2017 Foreword This limited edition of the DuraGalPlus ® Domestic Construction Manual has been prepared by Austube Mills based on the requirements of relevant Standards Australia and Industry specifications and in previous house testing A ceiling joist is a part or component of the house that you won't see daily. But unknown to many homeowners like you, it performs a necessary and important role in our homes. Ceiling joists are not only critical in maintaining your house's structural integrity but can also fulfill an aesthetic element
A ceiling attached to the bottom of the joists will generally dampen vibration as will interior partition walls running perpendicular to the joists. If a ceiling will not be attached to the Product Selection Guide based on joist span. Determine span, select desired performance level, choose joist option SPAN RATING Floor/Roof Span M AX. P N(I ) EDGE SUPPORT NO EDGE SUPPORT LO AD S (PF ) ROOF FLOOR SPAN THICKNESS T OAL D LIVE LOAD M X. NI NOTE: APPLIES TO PANELS 24 OR W ID E R (UBC SEC. 2312) Panel edges with tongue and groove joints or with blocking (2X BLOCKING) FOR 1/2, MAX. SPAN +24 JOIST TO SILL OR GIRDER, TOE NAIL BRIDGING TO JOIST. 3 minimum ceiling joist- lap @ bearing wallw/nails per rafter wall section: raised floor construction 2x blocking @ 8'-0 oc for joist spans over 8'-0 poured conc. pier w/ post base 4x4 p.t.post w/ post cap 4x girder 6 12 at joist splice lap 3 min. w/ 3-10d l fascia board l undist. ground grade ne e.n. 8d@6oc 30 min. ght see note 14 2x. of the span for MSR ﬂange I-Joists, blocking panels and 1x4 strapping at each 1/4 of the span 3 Rows Blocking & Ceiling for Nascor Original, blocking panels at midspan and each 1/3 of the span; 1/2 gypsum board applied to Joist for MSR ﬂange I-Joists, blocking panels at each 1/4 of the span; 1/2 gypsum board applied to Joist The roof span is 16' and the ledger will be supported by a existing horizontal structural beam on the cabin roof structure. I intend to splice (2) 2x8x8' boards which will be supported with a knee wall at about 4' down the roof span from the ledger. This leaves a 12' span from the knee wall to the new shed roof wall of the mud room
Floor Joist Spans 33 - 45 Floor Joist Bridging and Bracing Requirements 33 Ceiling Spans (S-Section) 52 - 54 2 The tables in this catalog are calculated based on inside corner radii listed in this table. The inside corner radius is the maximum of 3/ 32 - t/2 or 1.5t,. The width is considerably more important than the thickness of a board. For example, a joist made from doubled 2 x 6s can span a distance about 25 percent more than a single 2 x 6, but a 2 x 12 can span about 80 percent more than a 2 x 6, even though it has the same amount of wood as a doubled 2 x 6 BORED HOLES FOR FLOOR JOIST, CEILING JOIST & RAFTERS 2 X 4 2 X 6 2 X 8 2 X 10 2 X 12 Depth of end notches: floor, ceiling & rafters 7/8 1 3/8 1 13/16 2 5/16 2 13/16 Depth of notches located between the ends & middle 1/3 of the span 9/16 15/16 1 3/16 1 9/16 1 7/8 Length of notche Table Notes Spans are based upon continuous support of compression flange over the full length of the joist. Calculated allowable properties are based upon AISI S100-07, North American Specification for the Design of Cold-Formed Steel Structural Members. For two equal spans, the listed span is the center-to-center distance from either end to the center support Rafter Ceiling Joist Combination 2, 3, 4 Floor Joists Ceiling Joists LUMBER GRADE Douglas Fir Larch N0.2 ALLOWABLE SPANS FOR JOISTS & RAFTERS 12'-6 11'-6 16'-0 This Span Chart shall not be used for Flat Roof Design. 3 DL (Roof dead load)= 15 psf Max. Roofing Load: 6psf (Asphalt Shingles