.st0{fill:#FFFFFF;} .st1{fill:#007E48;} .st2{fill:#1D1D1B;} A HISTORY OF INNOVATION ENGINEERED TIMBER / Products & Services / Engineered Timber / JJI-Joists / Interactive Span Table This application will specify a list of acceptable JJI-Joists once you enter your support conditions, load case and clear span. Once these have been entered, the joists suitable for this application appear in the table below. Supports Built-In On Hangers Loadings House Flat mm This application assumes the following: House Loading: 0.75kN/m2 Dead Load + 1.5kN/m2 Imposed Load. Flat Loading: 1.15kN/m2 Dead Load + 1.5kN/m2 Imposed Load. Deflection Limit: 0.003 x engineering span or 12mm whichever is lesser. It is assumed that for "Built-In" joists that the masonry is 100mm wide and for joists "On Hangers" the hanger has a 75mm bottom plate. "Max. Centres" is the maximum centres that this joist can be used for in this application. If a joist's "Max. Centres" is 600mm then the joist can be used at 300mm, 400mm, 480mm and 600mm centres. If it's Max. Centres is 300mm then it can only be used at 300mm centres. Cost Index is a rough estimate of the order of Joists and Centres, from cheapest to most expensive, based on RRP. 0 is the most cost effective. These calculations are only to be used as a guide and for any further use including multi-span, multi-ply or non-uniformly loaded joists you should refer to JoistMaster, available by contacting: jji-joists@jamesjones.co.uk. BACK TO TOP ^ Interactive Span Table Contacts Careers Distributor Map Terms & conditions Company Policies & Finance Site map Cookies Policy Cookie Preference Centre Tel: (01324) 56 22 41 Fax: (01324) 55 87 55 Email: info@jamesjones.co.uk James Jones & Sons Ltd Head Office, Broomage Avenue Larbert, Stirlingshire FK5 4NQ © James Jones & Sons Limited 2021 We use cookies to offer you a better browsing experience, analyse site traffic, personalise content, and serve targeted advertisements. Read about how we use cookies and how you can control them by clicking "Cookie Settings." If you continue to use this site, you consent to our use of cookies. Cookie Settings