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MWJ’s (Metal Web Joists)

MWJ’s are an engineered timber product produced in many countries such as North America, Scandinavia, Russia, UK, Europe and The Baltics and are similar to I Beams but with a timber top and bottom chord and metal webs between. It is well known in the Offsite MMC Timber Frame Industry, and general construction where it has been used for many years .

Advantages: it is strong and stable and light and easy to use, for installation of floor systems, walls and roof systems and the open metal webs allow for services to be integrated without drilling holes or jeopardising strength. Extremely stable and can be made to extended spans.

MWJ’s – are generally certified and are supplied in different depths for general construction, floor systems, roof systems and also wall systems.  Quick and easy to use.


DepthDiameter HeightWidthSquareXY

Other Sizes from different manufacturers may be available on Application

Available for Shipping, Imported in FULL LORRY LOADS/CONTAINERS from UK, European, Canada and North America by LORRY LOAD QUANTITIES from UK stockists.


Environmentally friendly – Uses less timber than traditional floor joists.

Open web system gives almost uninterrupted access for the passage of services, which eliminates unauthorised drilling/notching and a reduction/elimination of surface run pipework. Ideal for Mechanical Ventilation & Heat Recovery (MVHR)

72/97mm wide flanges provide a large area for the fixing of floor deck and ceiling.

Engineered and manufactured by Minera Roof Trusses to exact site measurements which reduces site wastage

Minimal shrinkage or swelling which reduces noise in the floor zone, i.e. SQUEAKS.

As two-thirds of the joist is removed and replaced with a high-density galvanised metal plate, they are of a lightweight construction and easier to handle on site.

Erection of Metal Web Joist (Space Joist | Floor Joist | EcoJoist | Posi-Joist | Easi-Joist) in approximately 50% of the time required for traditional floor joists.

The Metal Web Joist can be top chord supported. Only 97 x 47mm of timber will be inserted into the brickwork wall helping reduce noise as less timber is present. Top chord supported is also useful for support on top of timber beams or timber lintels

A viable alternative to concrete floors for flat and office developments

Can be preservative treated to prolong timber life and to prevent insect attack, unlike our other engineered floor product

As the product is fully engineered, structural calculations can be handed to your building inspector at your Local Authority