Our metal web joists are high quality, affordable and Eco-friendly. At Minera Roof Trusses we are always evolving to satisfy the requirements of an ever changing market whilst operating within a constantly developing industry. For over 40 years, we have been at the forefront of our market. This includes supplying professional, bespoke floor joists and providing our customers with the highest quality of service.
Alongside attic and roof trusses, we also supply our premier joist product: the Metal Web Joist. These are ideal for floors or flat and mono-pitched roofs which can be used in domestic, industrial and commercial installations.
We work in partnership with ITW Construction Products, a leading manufacturer and specialist of builder’s metalwork and offsite fabrication solutions. We share our drive and passion in offering differentiation through service and innovation where providing a significantly improved alternative to traditional joists is key to what we do.
Metal Web Joists combine the lightweight attribute of timber and strength of steel to form an open web structure. Delivered manufactured to site, this allows for ease of installation and increased strength in comparison to traditional methods. They have advanced on their ability to offer a comprehensive range of depths and cater for greater flexibility with spans.
In addition, we also stock a high quality range of ancillary products that will assist you in your build. This includes Joist Seals, Bolts and Nails and Cut End Treatment.
Traditional floor joists typically use timber sizes of 225 x 50mm or 225 x 75mm. In contrast, engineered metal web joists use much smaller timber sections—usually 97 x 47mm or 72 x 47mm. While the overall floor depth can still be 219mm, the main difference lies in the design. Instead of solid timber, the center of the joist features a V-shaped metal web.
This innovative design reduces the amount of timber needed for your project. It also offers a practical advantage for tradespeople, making it easier to install cabling and piping.
This option has quickly become a popular choice in the construction industry. As self-build projects grow more ambitious and complex, more customers are turning to this modern solution.
We’ve supplied these products for a wide range of projects—from small extensions like orangeries and sun lounges to large-scale builds, including a featured “Grand Designs” project in the Malvern Hills.
The joists are designed with tradespeople in mind. They help make the job easier for builders, electricians, and plumbers by simplifying the installation of services like wiring and plumbing.
Bespoke floor joists designed, manufactured and delivered to site within 5 working days but the benefits don’t stop there!
As one of the first roof truss fabricators to establish an engineering design department at the truss plant, tight quality control methods were introduced over 15 years ago and this enabled us to undertake complex roof projects working with architects and engineers on various schemes.
This has now been extended to our engineered floor joist department. With the investment of high tech manufacturing equipment, we will deliver your engineered solutions to site in 5 WORKING DAYS in the UK.
Please find below a brief summary of why you should choose our engineered floor joist system with the open metal web over traditional joists and I Joists.
Please note: Our full calculations can be used for LA control as they include vibration and deflection checks compliant with Euro Code. This is not possible with traditional joists.
We provide the solution to installing MVHR into your building without returning to the drawing board. Our bespoke joists are specially designed with a central metal web structure allowing for ease of access for trades whilst not compromising on strength.
This is successfully used in all forms of construction, whether domestic, commercial or retail in the floor or in the roof as the benefits of overall build time surpasses all other systems when taking into account the follow-on trades.
Tables for domestic floor loading (based on TR26 timber). Subject to dimension changes for staircase openings.
We are frequently asked by customers, “What is the maximum span that can be achieved with the minimum depth?” We have included this diagram for guideline purposes based on a domestic floor loading.
Please note that all designs should be confirmed by a member of our team as there are some circumstances for example, office floor loadings or the installation of a staircase which can affect these guideline spans.
There are many benefits of metal web joists – one is that they have large open spaces for services to feed through. We’re often asked what size the pipes need to be and have given a guide for your reference below. This varies depending on whether your pipes are circular, rectangular or square in shape.
It’s important to note that they must not be cut, drilled or notched as this may impact negatively on their structural durability.
Please note: All metal work required for basic installation is quoted for and supplied with your order. This includes metal connectors, strong back bracing and any additional timbers.
In cases where 2 ply joists are required due to floor loadings, these are screwed together in house and arrive on site as one unit.
Our joists are always labelled with ‘TOP’ to show which way up the joists should be installed. Please see our illustration below for more guidance or refer to the Space Joist installation guide.
Mechanical Ventilation with Heat Recovery (MVHR) can be used for properties built or refurbished to current Building Regulations Part F and L standards where air permeability can be down to 3 to 4 m3/h at 50pa pressure difference.
Every one of us exhales 10 to 75 litres of CO2 per hour and up to 175 grams of water per hour. A family of four produces 10-15 litres of water vapour a day through breathing, washing, showering and cooking.
The MVHR system extracts warm moist air via ducts to wet rooms and passes this air through a heat recovery cell before it is discharged outside. At the same time fresh air from outside is drawn through the cell where it is warmed and distributed to the living rooms and bedrooms.
The system comprises a Heat Recovery Unit and a network of ducting which is connected to each room. It extracts warm moist air via ducts to the wet rooms and passes this air through a heat recovery cell before it is discharged outside. At the same time fresh air from outside is drawn through the cell where it is warmed and distributed to the living rooms and bedrooms.
The ducting runs within the ceiling or floor space of the rooms, hidden from view, however this can present challenges from an installation point of view in running the ducting within the joisting system.
Minera provides the solution to installing MVHR into your building without returning to the drawing board. Our open, bespoke metal web joists are specially designed with a central open metal web structure allowing for ease of access for trades whilst not compromising on strength. This is successfully used in all forms of construction, whether domestic, commercial or retail in the floor or in the roof as the benefits of overall build time surpasses all other systems when taking into account the follow-on trades.
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