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Last edited 09 Feb 2022
Thin webbed joists
|This thin webbed joist was made from strength graded timber and oriented strand boards (OSBs).|
Engineered wood products and an introduction to timber structural systems, published by the Structural Timber Association, defines a thin webbed joist as: ‘an engineered wood product (EWP) manufactured with flanges made from softwood or laminated veneer lumber (LVL) with glued, thin webs generally made from oriented strand boards (OSBs), fibreboard or plywood. Thin webbed joists can be used to resist either flexural or axial loads or a combination of both.’
|This cross section illustrates the "I" shape associated with the name, I-joist.|
I-joists are relatively light and have significant strength in relation to their size. They are also generally believed to be easier to handle and are less likely than equivalent solid timber sections to become misshapen or to split.
The Code of Practice for Engineered Wood Products published by the Engineered Wood Products Committee of the UK Timber Frame Association, states that I-joists “are made using a continuous process in lengths up to 20m and are cut to the desired length either in a factory prior to delivery or on site. The flanges have a pre-formed rout into which the bevelled web section is glued using an adhesive that has been approved for structural purposes (meaning they should either comply with Type I specification as defined in BS EN 301 or should be an equivalent strength and durability as verified by independent third party assessment and certification).’
They can be used with several applications, including:
- Floor and roof joists (however, open web joists also known as metal web joists are sometimes preferred over thin webbed joists for these applications).
- Loadbearing studs.
- Cladding support.
- Prefabricated cassette floors.
- Engineered wood rim board.
- Metal web joists.
- Timber post and beam construction.
- Timber engineered structural frames.
- Types of flooring.
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