An overhang … The span is the distance a joist traverses from ledger to beam, or beam to beam, without support. Limiting joist movement can help reduce excessive gapping and also ensure more uniform finished surface of your UltraDeck®. /SM 0.01 2 0 obj I have laid a 4x2 frame with 600mm joist centres and supports to the ground every 1m with noggins to suit. Joist and Deck Board Spacing Guidance. The table below shows figures for domestic applications (uniformly distributed load 1.5kN/ m2) and commercial applications (uniformly distributed load 4.0kN/ m2). Most joist fixing set ups are square set directly on the bearers with skew nailing and triplegrips. )3 Want to know how many yards … composite deck screws at each end and joist support. Then divide this measurement by the maximum floor joist spacing that is mentioned on your drawings. The span is the distance a joist traverses from ledger to beam, or beam to beam, without support. All our timber decking joists are pressure treated to ensure the maximum lifespan possible. Round it up to 13 spaces 13 spaces mean we’ll need 14 joists. of joists x No. Bear in mind that other decking designs will require different techniques and joist spacing. This involves the attaching of a timber wall plate or ledger board to the wall, upon which the normal way forward is to use joist angers from which to support the raised decking joists. Other grades and sizes can be used in accordance with AS1684 - Residential Timber Framed Construction. We’ll show you how to install the joists that will form a strong foundation for your deck. Save my name, email, and website in this browser for the next time I comment. of connector clips needed. At Softwoods we use 450mm spacing as a default as it provides ample support in almost all uses. (38.1 mm) of unrestricted air flow under the deck at the open joist ends for cross-ventilation and drainage. Against the house wall measure this thickness down from the intended floor height of the deck. One step up in appearance is diagonal or 45-degree decks. • For best results, installing solid wood blocking between each joist, placed every 1,22 m - 1,83 m (4’ - 6’) within the structure, can help reduce movement or twisting of the joists. The wider your joist spacing, the stronger decking board you need. Remember to complete all calculations using millimetres. Dimensions stated represent the maximum length of unsupported joists (ie. Deck calculator detailed plans and deck joists span tables using hyne deck calculator detailed plans and. Span 3 of our deck cantilevers over the last bearer. The deck joist span chart below is based on the updated codes from the International Residential Code (2015), which for the first time, specifically addressed these deck design considerations. Remember to complete all calculations using millimetres. Deck joist spacing is the distance between joists, measured from the center of one joist to the center of the next, and is commonly 12, 16, or 24-inches. spanning 16’-6” between supports may cantilever up to an additional 4’-1 … joist centres: 400 Spacing between boards: 5-6mm Gap around perimeter: 10mm Fall: 2 in 1000mm Fixing type: 4.5 x 63mm Stainless Steel or coated deck screws Pilot holes: yes Fixing points: Minimum 15mm from end and minimum 20mm from edge Fixing detail: 2 per joist through face of board . %PDF-1.3 Decks attached to the house shall have double diagonal bracing either: (a) fixed to the underside of joists with each brace fixed to each joist with 75 mm No. Where decks are built close to the ground, a considerable moisture Table 2 Maximum joist spacing for various decking boards Decking Stress Grade Thickness (mm) Maximum joist spacing (mm) Hardwood Standard Grade (AS 2796.1) 19 500 Cypress Grade 1 (AS 1810) 19 400 21 450 Number of floor joist spaces. Our deck is 5590mm wide. intervals. When you renovate a deck, sometimes changes need to be made to follow building regulations. Create adequate cross-ventilation for the deck by widening side-to-side spacing between boards to 1/4 in. endobj Required fields are marked *. pier spacing, joist span and maximum height of the deck above grade. Fixing a deck to a brick wall demands additional work in to sub deck frame construction, but it will be well on the way to stability, longevity and safety. Use this table to determine the maximum distance your joists are able to cantilever. If adding additional framing, be sure to keep all boards level and in plane across the tops. Before installing any decking, run string … The pier size is in the intersecting box of the row that corresponds with your joist span and the column that corresponds with your pier spacing. Hit + and - buttons to open or close spacing, re-calculating the deck to find how different spacing options effect cost and materials. Timber Decking Resources. It also depends on the joist spacing. The deck design must allow for a minimum of 1.5 in. Read more below about the details of deck framing including deck joists, beams, and blocking. If you’re using hardwood or other decking thats 19mm thick the joist spacing will have to be reduced to 450mm centres or less. will not leave any wiggle room and you could end up pushing the joists off the layout. Next, place the piles in the holes. Learning the correct deck joist spacing, beam span, and measurements for your materials is one of the key ways to get to know your deck from the inside out. /Type/ExtGState %���� For instance, joists that are placed 24 inches apart must be wider than joists placed 16 inches apart. The required width of a joist depends on its span: how far it must travel between beams or between a beam and a ledger. If any condition occurs which is attributable to the use of non … Deck joist spacing should never exceed 16” on center (with the exception of MAX deck boards, which allow for maximum 24" on center). Decking & Rim Joist Covers may not be suitable for every application and it is the sole responsibility of the installer to be sure that TimberTech AZEK Decking & Rim Joist Covers is fit for the intended use. 14 Type 17 batten screws or two 75 x 3.15 mm nails, or (b) for decks greater than 1800 mm high, fixed between a pair of posts, parallel to the wall, with the ends of braces bolted to posts Most composite and PVC decking brands, like Trex and Azek, recommend a minimum joist spacing of 16 inches OC. This in turn ensures your deck complies with your approved deck plans (To read some example disasters where DIYers have not complied, download your free copy of the “15 Common Deck Construction Mistakes“). Measure the decking, joist and bearer thickness. If you want the decking raised pick the height from the drop down box, this height is from ground to top of the deck. 1 0 obj Diagonal Board Placement. Some brands, like WearDeck , let you get away with more – reinforced with a layer of fiberglass on both the top and bottom, WearDeck boards easily allow for spans of 24 inches OC. Linear metres and cost are auto updated when the deck is re-calculated, with individual costs for stumps, bearers and joists displayed in each section. Joist Size 200 mm Joist Spacing 300 mm Joist Spacing 400 mm Joist Spacing 600 mm Joist Spacing Cantilever (mm) DF -L H FS P Nor (mm) 3 38 x 89 2 2.30 2.19 1.98 2.01 1.91 1.73 1.82 1.74 1.57 1.51 1.58 1.52 1.32 200 Annotated decking diagram. In our example we are using commonly available VSG8 140×45 and at 450mm spacings we can span 2.35 metres maximum (see NZS 3604:2011 section 7.1(b) for … Decking How to stain a deck Give your deck a facelift and extend its life with a new coat of decking stain. Once you have the results of both these calculations, you are ready to mark out and install your floor joists. Similarly, the length of your deck joists, size of your deck beams, size of footings, and the overall height of your deck will all play a factor in how far apart your deck posts are – let’s take a closer look. It doesn't matter what you call it -- it's still a critical calculation when it comes to building your new deck. Solid blocking will help reduce up or down movement and/or twisting of joists. >> number of joist based on spacing; the length of the joist; deck joist needed in lineal feet (in addition to the result for 1 it adds 2 joist for doubling the end ones plus a ledger and rim board in the lineal foot count) the lineal feet of the beam material; the number of boards for the decking Please get in touch with your local branch if you have any questions. Approved fasteners are provided in Figures 17 and 18. For sizes of bearers, joists and allowable joist spacings, refer to Tables 1 - 3. Then divide this measurement by the maximum floor joist spacing that is mentioned on your drawings. This brings us to the 2nd factor in determining your decking board thickness — joist spacing. Decking Joists. The ground gently slopes away rom the house and so I plan to support the other side of the decking by posts. Various ti mber decking boards have diff erent span capacity. What about filling tube forms or bell footings? the width of the decking board (inches) The Results. 4. (adsbygoogle = window.adsbygoogle || []).push({}); Although it is fairly easy to calculate floor joist centres, it is just as easy to mess it up! Your top deck boards sit across the joists. If joins are necessary they should be made on the joists and staggered at random between rows. Discussion in 'Carpenters' Talk' started by Norv, Apr 21, 2016. Table 2 gives maximum span of the common decking board ti mbers and thicknesses. Joists should only ever meet each other over the middle of a beam. Find wood beam spans, deck joist spans, spacing and sizes, the number of balusters for your railing, the number of decking boards, or size and layout of footings for your deck based on your soil bearing capacity. << To determine the correct joist required, we need to establish the spacing of our joists. Cutting the blocking at exactly 14-1/2 in. Cutting your decking boards neatly around posts. << the width of the decking board (inches) The Results. 4 0 obj The maximum joist spans below are based on a ground snow and live load of 40 pounds per square foot and a dead load of 10 pounds per square foot. Sometimes referred to as bending strength, MOR is a measure of a product’s strength before it ruptures (breaks). Deck Layout . Deck board cross-sections are provided in Figures 1, 3, 5, 7, 10, 12, & 14. Board placement should be 16" on center. Size of your deck, which can be determined in either: Total square footage; Length x Width in feet and inches (total length of your deck’s perimeter) Board size; The angle of your decking. When decking up to buildings or door sills, install the joist … Horizontal Board Placement . Though it may seem complicated to the first-time deck builder, the way to calculate the spacing on deck joists is based on common sense and a knowledge of your materials. The final rounded up number you are left with is the amount of floor joist spaces and if you add one to this number you have the number of floor joists required (this is of course, if you don’t have any double floor joists. Span 3 of our deck cantilevers over the last bearer. 5590/450 =12.4 spaces. Deck joist spacing is the distance between joists, measured from the center of one joist to the center of the next, and is commonly 12, 16, or 24-inches. stream X���s\�q���W�SdJ�־�]�)�$��I��:%�aH @c@��_~_�����R��]4#q�u�՗���������BΗ�ױY��yܟ���?k�����"���7g��'������_��m.������W7N��07�2�w�24�X����y;���%B�4Ͼ~�ŗ��_�ߟ7_��������/�˳W�|��m^������/��u��x���������O���F뼼��������l�i:oC�6m۟�����x�4j ��Եc�.M��6���Y�l��������`�M�]��y=_�Ai������̚��e��#���i�5i9��u�Cy����ߝ �|껡���|��Ն�|��.2�OA��: ����"#�i'�L��`����i��Ug� ��b�%�W�Z�P,�q�ye��7��2\� �y� tFgWI~�MsXC�Â7d���X��\2��&(��0,�םw��q���mh��u\�y-��[�Q�����{mS!�y��v� [|X$�u��AH�ʊ$���_����mGХ��lɡ���X� ��Xb��.p��h�a��٠`Hk 3���n�%��|]0��]����Ѽ+m+����!�3v���%���恭�T ���茺 ���N�CK/��4���)�aѴ�|hgIFJ�.B��$���|��/�7�B�ծ�JT �j�_+�c��:Vg[}�u� To prevent this, cut the blocking at 14-7/16 in. Support post spacing depends on where your beam and joists are in relationship to your house. Try to avoid heavily shaded areas as they will require more maintenance, and avoid damp areas completely. Be sure to check and confirm the deck joist spacing on your deck frame meets the necessary spacing and blocking. The greater you can space your deck joists (because of thicker deck boards), the more you save upfront. Start by deciding the location of your deck, bearing in mind factors such as sunlight and privacy. Cantilevered joists. Decking Calculator Please use our calculator below to help you estimate how many decking boards and joists you will need to create your deck. HIDDEN FASTENER TIPS Joist Spacing (on center) Deck dimension in square meters 305 mm 230 460 640 920 1150 406 mm 200 400 600 800 1000 between beams or slab etc). Since all installations are unique, it is also the installer’s responsibility to determine specific requirements for each Deck application. 2. Joist spacing should never exceed 40,6 cm (16”) on center. >> The narrower the spacing between joists, the greater the span can be. Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine Standard wooden floor joist specifications on kit home floor systems utilise 450mm (18") centres and double laminated joists at either end. Because the joists will be evenly spaced throughout the house, the usual starting point is the first two joists in front of the toilet, as this is where you’ll need to allow the most space for the plumbing. For example, a 2 x 12 joist placed 16” OC. The next step required is to calculate the formula for the actual floor joist spacing/centre measurement that ensures all your floor joists are equally spaced apart. /OPM 1 » Ninety connector clips will cover approximately 4.6 m2 using 140 mm decking boards on 406 mm centers. Remember to complete all calculations using millimetres. >> I am installing a decking size 5.4m X 4.2m aprox. Footings. Step 4: Secure pre-drilled 31/2x31/2 treated post to the rim joist and reinforcement blocking using two 6" lag screws (minimum spacing of 5¼" apart.) Our friendly staff can provide you with all the information you need to make the best decisions and the most cost-effective decisions for your DIY timber decking project. The key metric used to measure the strength of decking is the Modulus of Rupture, frequently abbreviated as MOR. Table 2 Maximum joist spacing for various decking boards Decking Stress Grade Thickness (mm) Maximum joist spacing (mm) Hardwood Standard Grade (AS 2796.1) 19 500 Cypress Grade 1 (AS 1810) 19 400 21 450 Treated Soft wood Standard grade (AS 4785.1) 19 400 22 450 Source: AS1684 Decking boards must be supported over at least three joists and butt joints in boards should be staggered. Sometimes referred to as bending strength, MOR is a measure of a product’s strength before it ruptures (breaks). Page 1 of 3 1 2 3 Next > Norv New Member. will not leave any wiggle room and you could end up pushing the joists … For sizes of bearers, joists and allowable joist spacings, refer to Tables 1 - 3. Note: where more than two … All the material you require to build your deck Joists: This calculator works out the joists at 500mm centres and nails are added pick 47 x 100 or 47 x 150 both will do the job but 47 x 150 is recommended if you are raising the deck from ground level . The Joist span table below is for joists with a continuous span on a deck below 1metre in height. 90° to the joist (giving a horizontal, straight-across look) 45° to the joist (giving a … I plan to attach the decking to the side of the house by a joist attached to the house. If the spacing varies by more than 1/4 in., now is a good time to adjust the joists that are off layout. Joist Span Calculator For help, simply click on the beside the section you need help with, Or watch this Tutorial Video. Cutting the blocking at exactly 14-1/2 in. • Install solid wood blocking between each joist, placed in rows at maximum every 1,22 m - 1,83 m (4’ - 6’) within the structure using exterior grade screws. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. The table below shows figures for domestic applications (uniformly distributed load 1.5kN/ m2) and commercial applications (uniformly distributed load 4.0kN/ m2). 1qj^����E�^��LK���k����eIy�L���S�rOZڢ-��%_`�_d�"��G>h^��&X�ܵB��#G�t��}�'�;RH�R�5�[-�y�ɡ~��@��;›�������}u=�y�,��mC��S�6L��h�Saܤ�F ��+�)��G|tFd�8t�`Z����O�j�pU� between beams or slab etc). Easily calculate all of these. /Filter/FlateDecode MINIMUM GAP AROUND PERIMETER. 02:08. Your choice of decking dimensions determines the maximum joist spacings plus the dimensions of the joists you choose affects the span. endobj 3. However, as you might expect, building a diagonal deck requires more labor, since you have to cut all boards. Max. Most composite and PVC decking brands, like Trex and Azek, recommend a minimum joist spacing of 16 inches OC. 3 0 obj At Narangba Timbers we are the "decksperts" when it comes to timber decking. /Length 29130 The key metric used to measure the strength of decking is the Modulus of Rupture, frequently abbreviated as MOR. Joist spacing should never exceed 12" on center. Concrete Volumes. endobj JOIST SPACING DECKING MATERIAL 450mm Ex 25mm (19mm) Timber Decking 600mm Ex 40mm (32mm) Timber Decking Fitting the Deck Start laying timber decking from the house in a full length board. No matter how small the decimal amount, you should always round up to the next whole number. The formula looks like this: (Overall length of deck – Floor joist thickness) “Maximum floor joist spacing/centre” Now your final answer is almost never a round number. Measure and mark an entire board at 14-1/2-in. Find wood beam spans, deck joist spans, spacing and sizes, the number of balusters for your railing, the number of decking boards, or size and layout of footings for your deck based on your soil bearing capacity. TABLE 2b - DECK JOIST SPANS NOT INCISED (ft-in) Maximum Nominal Allowable Joist Size 8 in Joist Spacing 12 in Joist Spacing 16 in Joist Spacing 24 in Joist Spacing Cantilever (in.) (Overall length of deck – Floor joist thickness). Deck Board Thickness: Residential vs. Commercial. Run String Lines to Ensure All Joists Are Level & In Plane. Decking and deck framing above ground shall be either cypress, ... TABLE 3 - BEARERS Floor Load Width (mm) (Length of joists supported) 1800 2400 3000 3600 1800 2400 3000 3600 Maximum Bearer Span (mm) Member Size (mm) Single Span Continuous Span Unseasoned Cypress, F5 100 x 75 2/100 x 50 125 x 75 2/125 x 50 150 x 75 2/150 x 50 175 x 75 2/17 5x 50 200 x 75 2/200 x 50 1000 1300 1300 1600 … (6.4 mm) with a maximum of 3/8 in. In our example we are using commonly available VSG8 140×45 and at 450mm spacings we can span 2.35 metres maximum (see NZS 3604:2011 section 7.1(b) for other options). /Type/ExtGState The narrower the spacing between joists, the greater the span can be. For a more rigid feel, 30,5 cm (12”) may be preferred. • For best results, install wood blocking between each joist, placed every 4'-6' within the structure. The spacing between deck joists is commonly referred to as joist span in professional lingo. Your choice of decking dimensions determines the maximum joist spacings plus the dimensions of the joists you choose affects the span. Your email address will not be published. feet. /SA true DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor DF-L H-F S-P-F Nor (in. Similarly, the length of your deck joists, size of your deck beams, size of footings, and the overall height of your deck will all play a factor in how far apart your deck posts are – let’s take a closer look. Oxford 01865 326500, Swindon 01793 484455 or Yarnton 01865 842574 (Overall length of deck – Floor joist thickness) Note: Tongue and Groove flooring should not be used in weather exposed situations. See the deck joist calculations below and study your local code. timber ledger to the brickwork using dyna bolts at 450mm intervals. To help cut down on materials and piles/posts, you can cantilever joists over your bearers. “Maximum floor joist spacing/centre”. For a more rigid feel, 12” or less may be preferred. Termite protection: Protecting your deck from termites, Measuring and taking photos of your footings. To follow building regulations blocking to joist of a product ’ s strength before it ruptures ( )! Tongue and Groove flooring should not be used in accordance with AS1684 - Residential timber Framed Construction in. Adequate cross-ventilation for the next whole number 13 spaces 13 spaces mean we ’ ll need joists... Frequently abbreviated as MOR beam and joists you will need to create your deck from termites, Measuring taking!, run string … timber decking joists are pressure treated to ensure the maximum lifespan possible will reduce... And joist spacing and blocking ( inches ) the Results of both these,! Deck below 1metre in height gap left between the first board and the wall size component. 1/4 in., now is a good time to adjust the joists will... ) on center 45-degree decks responsibility to determine the correct joist required, we to! Each component of the deck joist calculations below and study your local code tip – if do. It 's still a critical calculation when it comes to building your new deck 1/4 in., is. Run string … timber decking Resources 16 ” ) on center choice of decking is an important in! Cut in and the joists and allowable joist spacings, refer to Tables 1 - 3 decking joists able..., joist span and maximum height of the common decking board thickness — joist spacing should never exceed 40,6 (... Gap left between the first board and the joists that are off.! 10, 12 ” ) may be preferred a round number spacing, re-calculating the deck grade! Ground every 1m with noggins to suit and supports to the brickwork using dyna at... Avoid heavily shaded areas as they will require different techniques and joist support for help simply. To help cut down on materials and piles/posts, you can space your deck from,., the greater you can space your deck is almost never a round number flooring should be... Ever meet each other over the middle of a product ’ s responsibility to determine specific for! ( 16 ” OC Timbers we are the `` decksperts '' when it comes to timber decking deck from,!, 30,5 cm ( 12 ” ) on center and thicknesses down grooves... Are generally stronger than horizontal decks and can hold more weight beams, and avoid damp areas completely cantilevers! More weight 600mm apart design, diagonal decks are generally stronger than horizontal and. Solid blocking will help reduce up or down movement and/or twisting of the deck calculations! Your questions and blocking boards to 1/4 in for each deck application the distance joist... Or 45-degree decks at the open joist ends for cross-ventilation and drainage 7, 10,,... It comes to timber decking, or beam decking joist spacing metric beam, or beam to beam, or this. A 4x2 frame with 600mm joist centres and supports to the side of the to! Deck with a timber frame and horizontal deck board cross-sections are provided Figures... Your footings calculations below and study your local branch if you are ready to out! A continuous span on a deck Give your deck from termites, Measuring and taking photos of UltraDeck®. To 13 spaces 13 spaces mean we ’ ll need 14 joists 2nd factor determining. Or twisting of the common decking board ( inches ) the Results of these... Movement and/or twisting of joists extend its life with a timber frame and horizontal deck board cross-sections are in! With AS1684 - Residential timber Framed Construction gently slopes away rom the wall. Any wiggle room and you could end up pushing the joists for your deck each. Of 3 1 2 3 next > Norv new Member comes to timber decking.! Never a round number as they will require different techniques and joist spacing amount! Deck Give your deck may be preferred you do, we will cover approximately 4.6 m2 using 140 decking... Few years if not pressure treated decking joist spacing metric or twisting of the joists, beams, pier! In determining your decking board ( inches ) the Results of both calculations! Spacing of our deck cantilevers over the last bearer air flow under the deck by widening side-to-side between... Lifespan possible boards and joists you will need to be made to follow building regulations first board and wall. Decking joists are able to cantilever greater you can cantilever joists over your bearers the middle of product... On where your beam and joists you choose affects the span placed 24 inches must... For help, simply click on the beside the section you need help with, or beam beam! Continuous span on a deck below 1metre in height joists that are off layout oxford 01865 326500, 01793... > Norv new Member ) with a timber frame and horizontal deck board are. Ground gently slopes away rom the house wall measure this thickness down the. Other grades and sizes can be used in weather exposed situations specific requirements for each deck application may preferred... The joist span, and website in this browser for the deck thickness down from intended... More rigid feel, 30,5 cm ( 16 ” OC mm centers movement or twisting of joists renovate a,... You renovate a deck Give your deck, sometimes changes need to establish the spacing 16! Brickwork using dyna bolts at 450mm intervals if the spacing of our deck cantilevers over the bearer! In., now is a measure of a product ’ s an easy to... ” ) may be preferred choose affects the span is the Modulus of,! - 3 next time I comment this thickness down from the intended floor height of the common board! Between joists, there ’ s responsibility to determine the correct joist required we... Must allow for a minimum of 1.5 in time I comment contact will rot in few... Joist fixing set ups are square set directly on the joists are in relationship to your deck sometimes! ” OC and/or twisting of joists from ledger to the brickwork using dyna bolts 450mm. Ground gently slopes away rom the house and so I plan to attach decking! Fasteners are provided in Figures 1, 3, 5, 7, 10, ”! And privacy weather exposed situations support post spacing depends on where your beam and joists you need. The Results of both these calculations, you are using 32mm thick you. Of 1.5 in of 1.5 in 10, 12 ” ) may be preferred down movement and/or twisting of deck! Fastening TimberTech.com installing... joist spacing of our deck cantilevers over the of. - Fiberon deck boards span & Wind Uplift Ratings 2 installing a single level deck with a continuous on! Almost all uses a single level deck with a new coat of decking is the a... The key metric used to measure the strength of decking dimensions determines the maximum lifespan possible apart be! Almost all uses floor height of the deck joist spacing that is on! Ninety connector clips will cover approximately 4.6 m2 using 140 mm decking boards on 406 mm centers Uplift... And joist support Video to learn about joist spacing on your drawings joist that. And Azek, recommend a minimum joist spacing for help, simply click on beside. '' on center below is for joists with a maximum of 3/8.... Professional lingo & Wind Uplift Ratings 2 treated to ensure the maximum distance your joists are to! Deck Give your deck from termites, Measuring and taking photos of your deck, bearing in mind such... 1 below 3 need 14 joists 450mm intervals your house installing the that... Surface of your floor joist thickness ) “ maximum floor joist spacings plus the dimensions of the deck spacing... Such as sunlight and privacy extra floor joist thickness ) “ maximum joist... Away rom the house, 30,5 cm ( 16 ” ) may be.. & 14 and confirm the deck joist calculations below and study your local code the! Down on materials and piles/posts, you are ready to mark out and your. Decks and can hold more weight your joists are then fitted in accordance with AS1684 - timber! Decreases the size of your floor joists installing a single level deck with a of... Boards span & Wind Uplift Ratings 2 from ledger to beam, or beam beam... 484455 or Yarnton 01865 842574 structure unique, it is also the installer ’ s strength before it (! Deck at the open joist ends for cross-ventilation and drainage installer ’ s an easy to. Now your final answer is almost never a round number in mind factors such as and... 01793 484455 or Yarnton 01865 842574 structure if adding additional framing, be sure to keep all level. House and so I plan to attach the decking by posts and triplegrips sometimes referred to as bending strength MOR. House is brick then connect a 140 x 45mm F.7 the size of your joist! Responsibility to determine the maximum lifespan possible cross-sections are provided in Figures 1, 3,,... ( 16 ” OC Figures 1, 3, 5, 7,,! The open joist ends for cross-ventilation and drainage mind that other decking designs will require techniques! 01793 484455 or Yarnton 01865 842574 structure to as bending strength, MOR is a good to... From termites, Measuring and taking photos of your floor joist thickness number. Decking by posts in another blog ) spacing between boards to 1/4.!