Flitch Beams

Flitch beams are one of the most practical structural solutions for residential and commercial construction. At Southend Steels, we supply precision-cut steel flitch plates & timber beams to your exact dimensions, manufactured to industry standards and ready to integrate into your composite beam build.

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What Is a Flitch Beam?

A flitch beam is a composite structural beam made by sandwiching a steel plate (flitch plate), between two timber joists, then bolting the assembly together at regular intervals.

The steel core increases the load-bearing capacity and stiffness of the beam without increasing its overall depth, making it ideal for situations where beam height is restricted.

Flitch beams are widely used in extensions, loft conversions, floor beams and internal wall removals where a slim profile is needed.

Standard Flitch Plate Sizes

All plates can be cut to order. The table below shows common dimensions; non-standard sizes are available on request.

Dimension	Common Sizes
Width	100mm, 150mm, 200mm, 250mm, 300mm
Thickness	6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm
Length	2m – 6m (custom lengths available)
Material	Mild steel (S275/S355) or galvanised

Flitch Beam vs RSJ

*Swipe left to view full table in mobile.

	Flitch Beam	RSJ Steel Beam
Cost	Often more cost-effective	Higher material cost
Best for	Extensions, loft conversions, timber-framed builds	Larger spans, heavy structural loads
Fixing	Bolts into timber easily	Requires padstones or steel-to-steel connections

Always consult to confirm which solution is appropriate for your load requirements.

Why Choose Southend Steels for Flitch Beams

We offer premium-quality flitch beams in a wide range of sizes and thicknesses to suit your project’s specific needs. Our plates and beams are precisely fabricated to meet your requirements, ensuring they integrate seamlessly with timber and other materials for optimal performance.

Experience & Expertise

With our broad experience and qualified team of engineers, we have the expertise to provide you with the best steel products. From selection to delivery, we offer a seamless process that guarantees your complete satisfaction

Quality Products

Our flitch beams are of the highest quality, sourced and fabricated with precision to meet various industry standards and needs.

Personal Service

Unlike larger companies, we provide a personal and friendly service, ensuring that your unique requirements are catered to with the utmost attention to detail. We listen to you, understand your needs and provide a service that is tailored just for you.

Value For Money

Along with competitive pricing, we offer free delivery within Southend up to Rayleigh. Purchases over £500 are also entitled to free delivery, making us a cost-effective choice for all your steel requirements.

Steel & Timber Solutions

One of the advantages of working with us is that we source your flitch beam in one place. Our partner company E-Timber supplies premium treated timber specifically designed for structural construction applications.

Treated timber is chosen for its durability and resistance to moisture and movement. When paired with our precision-cut steel flitch plates, you get a complete flitch beam without having to go to multiple suppliers. We offer package deals on steel + timber combos.

FAQs

What is the difference between a flitch beam and a flitch plate?

A flitch plate is the steel element on its own. A flitch beam is the completed assembly, the steel plate sandwiched between timber joists and bolted together. Southend Steels supplies the steel flitch plate, cut to your size & our company E-Timber will provide you the C24 treated timber.

Why combine steel and timber in a flitch beam?

The steel plate significantly increases the strength and stiffness of the timber beam without adding much depth. It allows builders to span longer distances and carry heavier loads while retaining the look of timber.

How are flitch plates installed?

Typically, a flitch plate is placed between two timber beams and then bolted together at regular intervals using through bolts. The assembly must be engineered to ensure structural integrity.

Do flitch plates need to be treated or coated?

For interior use, mild steel plates are typically fine with a basic primer. For exterior or damp environments, galvanised or stainless steel plates are recommended to prevent corrosion.

Are flitch beams cost-effective?

They can be a more cost-effective solution than deep solid timber or full steel beams, especially when working with limited ceiling height or needing to preserve a timber look.

How quickly can you deliver flitch beams?

We typically turn around cut-to-size orders within a few days. Delivery across Essex, London and Kent is available, with free delivery on orders over £500 or within the Southend to Rayleigh area.

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If you’re wanting a timber flitch beam and steel flitch plates that combine strength, reliability, and great value, Southend Steels is the perfect choice.