Timber purlin size calculator - For FACIAL BOARD, remember the length and breadth of the plan of the building with its overhangs of 0.

 
The <strong>wood</strong> works well with the rest of the structure to ensure the room enclosed by the roof is breathable. . Timber purlin size calculator

Left click, release and drag in top diagram to directly measure full scale dimensions. TimberLife Educational Software Program - This leading edge, world first, multi-million dollar project has delivered an extensive range of the necessary tools that gives building and construction industry professionals the confidence to specify and detail timber in a wide range of applications, from sole plates to suspension bridges. With 2×6 posts, the girders and cross-members will need to be larger; otherwise, the top of the structure will look undersized and anemic. Mechanical Tolerance Variations of Lumber:. 6m to know the numbers of 3” by 4” to purchase in market=24 pcs of 3” by 4” required for rafters. There are some span restrictions based on the purlin size ( beam width x depth) and how close they are together. 22mm thickness requires 50-60mm length screws 32mm thickness requires 70mm length screws. Now the sum of the dead load (value) can be applied to advanced 3D structural analysis models which can automatically calculate the line loads on the rafters. Timber vs metal frames Timber is by far the most common material for house framing in Australia. Search: Purlin Spacing. In ULS design, the timber beam dimensions are found by the limits for bending and shear stresses of the timber material. Verify the beam for shear. Apr 21, 2008 · Alternative in just timber is 4/50x275C24 bolted together M12 at 600 along the length - that size of timber is probably difficult to get hold of, though. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Verify the beam for bending. Purlin Calculator Calculations to BS 5268-2:2002 and BS 5268-7. Place hanging beams in center of room or if needed divide room length/width by 3 (4) and space them equally. 175m (The purlins has to span the length of the building . About Purlin Size Calculator. (1000 mm minimum - 6000 mm maximum) This is the total length of the beam, including the bits where it sits on the wall. 1 Span, slope and spacing Is there a purlin supporting the rafters? No Yes This demo version is fixed at 1m clear span. The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above. The Purlins for a Roof calculator computes the total number and length of purlins for a simple gable roof based on the ridge length of the roof, the roof pitch and the span of the roof. Jack Porteous, Abdy Kermani Structural Timber Design to Eurocode 5 Wiley Blackwell (2008) By Jorge Ruferx. 2) For design parameters, refer to figure 7. Purlin Size. By woodhunt in forum The Garden Shed. Usually 400, 450 or 600mm, but any value can be used up to 610mm max 1. So for 100m, divide by 3. Nail both ends of purlin tie to truss or rafter for capacity required. They are quick and easy. When installed, they should be at least 1. * Minimum purlin size will vary according to span. 22mm thickness requires 50-60mm length screws 32mm thickness requires 70mm length screws. Struts 2: 103. 6m=15pcs of 1” by 12”. Get In Touch. * Minimum purlin size will vary according to span. (1000 mm minimum - 6000 mm maximum) This is the total length of the beam, including the bits where it sits on the wall. Rafter size for 10, 12, 15, 16, 18 , 20 & 24 foot. 5 x 13. Two steel web plates with three timber members. plate options for frame on shed slab. Wind Classification 1 & N2. A magnifying glass. Mechanical Tolerance Variations of Lumber:. 5m Maximum clear span 1. The purlin length standard will vary anywhere between 100 to 300 mm, while the thickness will vary anywhere between 1 to 3 mm. LVL Products. Try a demo. Two steel web plates with three timber members. F7 Rafters – 30mm. 1. In lightweight timber roof construction under purlins were used to support rafters over longer spans than the rafters alone could span. The full version allows any size Purlin spacing on slope metres Rafter slope (min 15, max 45) degrees Rafter width ↔ mm Rafter depth ↕ mm Rafter spacing mm. All data is in imperial units (Inches). There are three types of purlins in wood construction: Purlin plates (Under purlin ), Principal purlins and Common purlins. k, γM γ M) Assume the width w and height h of the cross section. Z purlin standard sizes. 55 inch - 2pcs. They provide the support for the external roofing material. To calculate maximum spans additional species of lumber, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website. parts of Scotland, Pennines, North East England and heights over 200m, refer to BS 6399-3). Strong and easy to work with, you wont need a professional!<. 9 kN point load. density and strength specifications to timber locally available, sizes and designs may need to be adapted to suit local sizes and conditions deck boards should have 4 to 6mm spaces for drainage and ventilation use 2 screws per joist. These can also be used on multi-bay buildings in lines of simple spanning purlins and girts. The dimensions used in the calculation below are based on this design. total load 1. 6m=15pcs of 1” by 12”. So for 100m, divide by 3. To calculate the costs, we use the following two formulas: Including installation costs: total costs = truss count * single truss price + cost per time unit of work * duration of work. Determine spacing and span direction · 2. factoring difference of cubes calculator fire link slot machine for sale; phone or email cannot be auto verified when user is not being auto confirmed huge cock xxl video hardcore; flagstaff pop up camper parts leatherman micra size; color detection python project report. 93 ft² 11. If not verified, increase the width or height of the beam and do the calculation again. Used when fixing roofing and cladding sheets to timber purlins. Span Options Calculator for Wood Joists and Rafters - American Wood Council Span Options Calculator for Wood Joists and Rafters Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. 2 Beam. Purlin Size Calculator Label the roof purlin size and spacing, if applicable. Choose from our library of thousands of common timber sections, or create your own and get instant results with our easy to understand. Now lets find the minimum allowable rafter size given the above scenario: Therefore given the above example, the minimum allowable rafter size for Hem-fir #3 lumber spanning 14′-0″ is a 2×10 since it can span 14′-5″. Tiles may be fitted to timber battens fixed to a proprietary metal liner tray. 22, AS1684. The full table shows more lumber sizes. If not verified increase the width or height of the beam and do the calculation again. Send Cubic Meters. Capacity from Low High Low cyclone testing as specified in the BCA for inclusion in the northern territory deemed to. For the example of the OSB board: 650 100 k g m 3 ∗ 0. Annex 3 – Sample Calculation. Nov 8, 2022 · To calculate the timber beam sizes/dimensions, both ULS (ultimate limit state) and SLS (serviceability limit state) calculations have to be done. 35 (unfavourable) Variable action γ G = 1. 8m Maximum clear span 2. For FACIAL BOARD, remember the length and breadth of the plan of the building with its overhangs of 0. density and strength specifications to timber locally available, sizes and designs may need to be adapted to suit local sizes and conditions deck boards should have 4 to 6mm spaces for drainage and ventilation use 2 screws per joist. All data is in imperial units (Inches). MS Tophats can be used for roof purlins, wall girts. For the example of the OSB board: 650 100 k g m 3 ∗ 0. Partial Factor for loads (BS EN 1990 NA 2. 6m=15pcs of 1” by 12”. 7 x (2. 5 450 1. 4 ft² at 22 ° ). density and strength specifications to timber locally available, sizes and designs may need to be adapted to suit local sizes and conditions deck boards should have 4 to 6mm spaces for drainage and ventilation use 2 screws per joist. Add to Wish List. 22, AS1684. Timber Bay Design Tool. Imposed (live) loads (snow load and short-term point load) Altitude not exceeding 100m: 0. Verify the beam for bending. When selecting suitable rafters using NZS 3604:2011 Timber-framed buildings. Span Options Calculator for Wood Joists and Rafters. 97 100-10 1. Cut your project timelines by . Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. Basis of calculation. k, γM γ M) Assume the width w and height h of the cross section. A timber beam 8 in. Steel Purlins XLS Microsoft Excel Technology. (1000 mm minimum - 6000 mm maximum) This is the total length of the beam, including the bits where it sits on the wall. Middle rack: 79. Please select a length and a quantity and our calculator will do the rest. Spacing (mm). Height of the truss in inches. If not verified, increase the width or height of the beam and do the calculation again. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Imposed (live) loads (snow load and short-term point load) Altitude not exceeding 100m: 0. 10 100-15 1. LVL Products. Steel alternative is 178x102UB19 with 100x50sw plate coach bolted M10 to top flange at staggered 600 nominal centres. You use the term "perlins". Usually 400, 450 or 600mm, but any value can be used up to 610mm max 1. Strong and easy to work with, you won't need a professional! Please select a length and a quantity, and our calculator . 12 jul 2021. One steel web plate with timber member each side. Please select a length and a quantity and our calculator will do the rest. Domestic dwelling with an allowance for non load bearing timber stud partitions on top of floor joists. Two steel web plates with three timber members. One timber member with steel web plate each side. Capacity from Low High Low cyclone testing as specified in the BCA for inclusion in the northern territory deemed to. These roofs are made up of separate rafters, ridge, purlins,. Enter the extension wall length into 'Wall Length' and double the extension wall width, then minus ridge thickness, into the 'Wall Width' entries. TECHNICAL DIAGRAM. When viewing the SCIPY document, you may have two modules that look very similar: scipy. In the ULS (ultimate limit state) Design we verify the stresses in the timber members due to bending, shear and normal forces. SCREW where specified requires a minimum of 30mm penetration into rafter or truss i. Spacing (mm). 2) * denotes 600 mm rafter spacing only. 12 jul 2021. Share this Calculation. Structural Timber SABS Untreated 38x152 6. Treated Timber Rafter / Purlin / Joist (3 1/2" x 1 1. Step 4 - Peel back the backing paper to reveal the sticky side of the EPDM patch. Choose a timber material and find material properties ( k m o d, f c. Pole Barn Montgomery County Building Regulations As A. 1 of 2 Go to page. Purlins – These are long pieces of timbers that are normally seen half way along the rafters and act like beams to reduce the span (unsupported length) of . Total length of 1454. Leave until dry to the touch. Roof Angle 15°. Covers any span and every load with pin point accuracy. The remaining purlins are installed with equal spacing between the two side purlins I'm concerned flat 2x4 purlins would bow if they span 4' between rafters The purpose of the pur. All data is in imperial units (Inches). As a result there are a lot more tradesmen who work with timber frames and the competition reduces prices even further. You can also enter the thickness and height of your floor joists using our calculator in Advanced mode (which you can activate at the bottom). Purlins are 2 by 4 feet and are installed much like metal roofing. Automatically calculate suitable sizes. 1:2010 (Amdt 3) Easy to use online Timber Beam engineering software for Australian Standards. Roof 10000 x 4969. 76: 200 x 72:. All Java graphical components that send messages must: Implement an EventHandler interface, i. Roof slope. I am using approximately 100m. 2 pine or LVL. PVC sheets – method of arranging and fixing to the battens rafters and purlins – RCC roof – slab with beams – flat and sloped slabs –Flat slab construction­ weather proof course to flat roof. If you think back to your early geometry classes, you might remember that the pitch of a triangle is the rise over the run. Timber strength class. Timber purlin size calculator. The one difference is that we need to calculate the roof rise using the pitch first. Roof 10000 x 4969. Considerations when using the Rafter and Joist Span Tables The lengths and sizes of joists vary depending on the species and quality of the lumber used. C5 The backing angle. 5 x 13. Roofing Calculator About this product Cladco Profiles manufacture metal Z Purlins for supporting either roofing sheets or vertical wall cladding. Purlins 24" oc are typical along with the bottom bracing shown C purlin span calculator Span Tables for Purlin Supporting Rafters (to BS 5268-7 Truss spacing can be increased, hence less numbers of trusses columns and foundation work resulting in further economy 9657 Building Kit Price Available with either a nail strip or clip system panel. what happens in anomaly detection microtech combat troodon; what to say to a judge to get off probation femdom handjob video; what is the most valid reason for refusing service to a patron kibana saml. As a result there are a lot more tradesmen who work with timber frames and the competition reduces prices even further. Structural Timber SABS Untreated 38x152 6. 3 Bolts Bolt diameter mm 2 Enter Load Details Load 1: Select load type Add another load. With rigorous analysis it is possible to construct to the same size purlins throughout but with the two end spans being 20% reduced in length. Where purlin spans are unequal between supports, each purlin should have 6. Cladco Profiles manufacture 175mm Z metal purlins/sheeting for supporting. 6:1990 Reset 1 Enter Purlin Details 1. Roofing Calculator About this product Cladco Profiles manufacture metal Z Purlins for supporting either roofing sheets or vertical wall cladding. 3 Timber strength class C16 (cost-effective, for most applications) C24 (stronger, more demanding) Show more 2 Loadings Dead load on the slope. Some pole barn construction questions Fine Homebuilding. To use this tool as a floor joist cost calculator: Enter the length and width of your floor. Before you make your final decision on lumber sizing and span, consult your local building code officials to determine design loads for your area. 75 kN/m² snow load & 0. It indicates, "Click to perform a search". 94: 2. 98 inch - 2pcs. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Nov 8, 2022 · To calculate the timber beam sizes/dimensions, both ULS (ultimate limit state) and SLS (serviceability limit state) calculations have to be done. truss count = ( (roof length * 12)/24) + 1, rounded up to the closest integer (for example if the result is 14. 6m=15pcs of 1” by 12”. You can also enter the thickness and height of your floor joists using our calculator in Advanced mode (which you can activate at the bottom). The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Purlin Calculator - Hip Roof. Mechanical Tolerance Variations of Lumber:. The actual stress in the timber . Structural Timber SABS Untreated 38x152 6. Timber is supplied in metric sizes. Mortar m 3. the location of purlin supports should be . The easy to use online ClearCalcs Timber Beam Calculator enables you to do quick and powerful design and analysis for simple and continuous timber beams, with unlimited supports and loads. 5o - 30o (mm) Flat Roof (max 10o pitch) (mm) 2. 3 metres along the building width which the rafters will span across and overhang either side by 200mm. Sand (Kg) Sand 40Kg Bags. 8 C r: repetitive member factor C r = 1. And a 10" deep purlin will be about double the cost of a 4" purlin. Roof 10000 x 4969. Dimension A mm (200 mm minimum - 3750 mm maximum) Dimension B mm (200 mm minimum - 3750 mm maximum) Roof pitch degrees (10 degrees minimum - 50 degrees maximum) Steel beam length mm (1000 mm minimum - 6000 mm maximum) This is the total length of the beam, including the bits where it sits on the wall Email address. 15 NDS 4. net worth percentile calculator 2022. Verify the beam for bending. That will generate a new drawing for you. mm. Coarse thatching grass or reed should have a 2. Verify the beam for shear. Explore multiple options for mass timber grids by adjusting the parameters below. Purlins 24" oc are typical along with the bottom bracing shown C purlin span calculator Span Tables for Purlin Supporting Rafters (to BS 5268-7 Truss spacing can be increased, hence less numbers of trusses columns and foundation work resulting in further economy 9657 Building Kit Price Available with either a nail strip or clip system panel. RLW × (½ u/p span left + ½ u/p span right + spread of fan strut). papachin ffxiv. Question is with bents on 16' centers what size purlins do you have? I imagine to satisfy the code it would be considered rafters with ceiling attached which. With 2×6 posts, the girders and cross-members will need to be larger; otherwise, the top of the structure will look undersized and anemic. Rafters 50x125C24 at 400 centres, bird beaked over wallplate and ridge beam. 2 and AS1684. F7 Rafters – 30mm. Seldom seen in new work but there are many great historical roofs far grander that the sketch above that rely on timber under purlins. 2 and 3. 25% of that purlin's span. Choose a timber material and find material properties ( k m o d, f c. See the bay data output table for these results along with structural depth and material takeoffs. This is a very traditional concept in heavy timber roof framing. Wind Classification 1 & N2. Rafter: Rafters are sloped beams that run from the roof’s ridge to the eaves. The Area Calculator can be used to calculate the area of a variety of simple shapes that together can comprise the area of the roof. 10 best thriller movies. Walls (building) 10000 x 4000. k f m. Enter a specific beam size. 5m Maximum clear span 1. Rafter size for 10, 12, 15, 16, 18 , 20 & 24 foot. MS Tophats can be used for roof purlins, wall girts. Calculate how far your deck joists can span when framing your deck. Material Specification. For example, an 8 x 4 under purlin would support the center of a row of 6 x 2 rafters that in turn would support 3 x 2 roof purlins to which the roof. The full version allows any size Rafter slope (min 15, max 45) degrees Rafter spacing mm. The C section can be supplied as a standard configuration or with the top flange bent to suit the roof slope. TABLE 1 - TIMBER POSTS - SUPPORTING PERGOLA OR CARPORT ROOF (MAX. This is compared to the ultimate capacity of the timber sections at yield. 23 jun 2022. academy sports jon boats

Possible Alternate Equal Rafter Centres. . Timber purlin size calculator

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Hi, pls, I need detailed explanations on how to calculate roofing materials based on roof plan. See auction date, current bid, equipment specs, and seller information for each lot. Roof Area 1138. C-section Dimensions and Properties. One steel web plate with timber member each side. ABLE SP. Purlin Size Calculator Label the roof purlin size and spacing, if applicable. So for 100m, divide by 3. 15 pcs of rafter (same as tie beam) multiply by 5. 2mm) thicker or wider than the nominal finished thickness or width, except that 20% of a shipment cannot be less than 2/32" (2. 8 C r: repetitive member factor C r = 1. You check the 'Purlin' box, enter purlin width, spacing and top and bottom purlin set-in and check radio buttons to either keep exact spacing (adjusting last at top) or calculating even spacings. Double check yourself with these span charts. You don't have a nailing surface on the end of a 1x4. The standard Z350 (350 g/m2). 10 best thriller movies. Notes: 1) Refer to general notes for information that is relevant for all span tables. Wind Classification 1 & N2. If you think back to your early geometry classes, you might remember that the pitch of a triangle is the rise over the run. How do I calculate roofing timber? WALL PLATE is the timber/wood that are placed on top of blocks or roof beams as the case may apply, so for the fastest way to calculate. Fits: 1979-1983 Cherokee. MISCELLANEOUS C PURLINS Other Online Auctions at EquipmentFacts. ©TIMBER QUEENSLAND LIMITED TECHNICAL DATA SHEET 19 PERGOLAS AND CARPORTS Revised March 2014 Page 2 TIMBER POSTS Table 1 lists the sizes for timber posts. nVent Caddy 123812M Conduit to Z Purlin Clip, EMT Conduit Size: 1/2" & 3/4", Steel Item. papachin ffxiv. 2 ene 2023. Timber purlin sizes Written by Kagar on 30. Span Options Calculator for Wood Joists and Rafters - American Wood Council. Rough lumber cannot be less than than 1/8" (3. density and strength specifications to timber locally available, sizes and designs may need to be adapted to suit local sizes and conditions deck boards should have 4 to 6mm spaces for drainage and ventilation use 2 screws per joist. Apr 21, 2008 · The present purlins are 7x3 inch. Steel grade. Have a question or need help? Call us on (07) 3808 2544 or Email Us. Where a traditionally framed roof (i. A magnifying glass. 6m each, so add the perimeter 9m+9m+18. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Rafter: Rafters are sloped beams that run from the roof’s ridge to the eaves. 2 metres from gable wall to gable wall which the ridge beam will sit on and overhang either side by 200mm, and 3. INSTRUCTIONS: Choose units and enter the following: ( L) Ridge Length (Note: this should include rake overhang) ( S) Roof Span ( P) Roof Pitch ( oH) Overhang. Free UK Span Tables for Purlin Supporting Rafters to BS 5268-7. com Open in new window. Purlins range from a 100mm x 75mm (4" x 3") section right up to 300mm x 100mm (12" x 4") and from around 3. MS Tophats can be used for roof purlins, wall girts. fft module is newer, it s. 6m each, so add the perimeter. You can change the values of any of the built-in loads, and if you have a load that isn't in the database you can also enter your own custom loads. Water reeds should have a 1-7 mm stem/butt diameter, and a 300 mm layer thickness. 9 kN point load. k, γ M) Assume the width w and height h of the cross-section. , this 6" x 2" is an ideal way to start your new deck. 2 and 3. 2022-7-5 · Spacing: mm Roof Slope: degrees Is the purlin near a roof edge or a change of roof slope e 50-ft Gothic Pro Tunnel, 14-ft wide, 4-ft Bow Spacing The Purlin Structural Ring Radius is measured from the center point of the Octagon along the hip rafter run line Structural Steel Sizes. TIMBER 50X76 IS USED FOR ROOF PURLINS. A 3-12 roof is equal to 14. The spacing of roof purlins on rafters usually calls for careful arrangement, . 175m=54m Divide 54m by 3. Imposed (live) loads (snow load and short-term point load) Altitude not exceeding 100m: 0. These spans were calculated using our purlin calculation engine. Nov 8, 2022 · To calculate the timber beam sizes/dimensions, both ULS (ultimate limit state) and SLS (serviceability limit state) calculations have to be done. 2022-7-5 · Spacing: mm Roof Slope: degrees Is the purlin near a roof edge or a change of roof slope e 50-ft Gothic Pro Tunnel, 14-ft wide, 4-ft Bow Spacing The Purlin Structural Ring Radius is measured from the center point of the Octagon along the hip rafter run line Structural Steel Sizes. Wind Classification 1 & N2. 1 Span, slope, purlin and rafter spacing · 1. I always use the charts published by LABC. 2 and 3. Purlins provide horizontal support for the sheets and form part of the framework for the building. Joists and rafter spans for common loading conditions can be determined. 6mm in steel*. Part # 26288. Jack Porteous, Abdy Kermani Structural Timber Design to Eurocode 5 Wiley Blackwell (2008) By Jorge Ruferx. Imposed (live) loads (snow load and short-term point load) Altitude not exceeding 100m: 0. Skip to primary navigation Skip to main content Skip to primary sidebar. If not verified, increase the width or height of the beam and do the calculation again. INSTRUCTIONS: Choose units and enter the following: ( L) Ridge Length (Note: this should include rake overhang) ( S) Roof Span ( P) Roof Pitch ( oH) Overhang. Skip to primary navigation Skip to main content Skip to primary sidebar. Verify the beam for bending. When installed, they should be at least 1. Add to compare. Graphical Construction Glossary >> Roofs and roofing. 5 450 2. All fixings assume that the purlin and battens are installed on their flat over the top of the rafter or truss. 5°) - Timber Beam Calculator Span tables › Purlin supporting rafters › Roof slope 15° or more but less than 22. The section reference of a C-section 232mm deep and 1. Other (more complex) load condition spans can be determined with our free Hyne Timber Design 7. plate options for frame on shed slab. The Purlin Mill, LLC; Claim. Nov 8, 2022 · To calculate the timber beam sizes/dimensions, both ULS (ultimate limit state) and SLS (serviceability limit state) calculations have to be done. Timber is a natural product and is subject to continual movement when exposed to atmospheric conditions. Please select a length and a quantity and our calculator will do the rest. 2) For design parameters, refer to figure 7. Purlin : The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. 2, 1. 1 Span, slope and spacing Is there a purlin supporting the rafters? No Yes This demo version is fixed at 1m clear span. When installed, they should be at least 1. 1) Refer to general notes for information that is relevant for all span tables. Purlin Laps. Structural Timber SABS Untreated 50x76 6. 2 Beam. 4 and 3. TECHNICAL DIAGRAM. Other (e. 315m (24') long. Usually 400, 450 or 600mm, but any value can be used up to 610mm max 1. 000mm to 20. If not verified increase the width or height of the beam and do the calculation again. (10 degrees minimum - 50 degrees maximum) Steel beam length. Dec 23, 2012 · I am using approximately 100m. It indicates, "Click to perform a search". 6 jun 2013. Rafter spans C24 strength class timber. 2m long and span at least three rafters. Z Purlins Spreadsheet Calculator Engineers Edge www. Skillion roof framing calculator plan diagram with full dimensions Walls (building) 10000 x 4000 Roof Angle 15° Lower overhang 400 Upper overhang 400 Roof 10000 x 4969 Roof Angle 15° Roof Fall 1286 Lower Wall Height 2400 - Upper Wall Height 3448 Lower Wall to High End of Rafter 1386 (NO Battens - Sheeting) Roof Area 49. 1) Refer to general notes for information that is relevant for all span tables. 175m=54m Divide 54m by 3. Sand (Kg) Sand 40Kg Bags. The abbreviation for kg/m and kg/m is kilogram per meter and kilogram per meter respectively. For example, an 8 x 4 under purlin would support the center of a row of 6 x 2 rafters that in turn would support 3 x 2 roof purlins to which the roof. 94: 2. Purlins are 2 by 4 feet and are installed much like metal roofing. If you think back to your early geometry classes, you might remember that the pitch of a triangle is the rise over the run. A magnifying glass. Timber sizes and construction details. Add to Wish List. 38: 175 x 72: 2. 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