4.8m 100×47 c grade joist manufactured to provide a strong, reliable, and practical solution for structural construction and landscaping applications. Commonly used in decking subframes, flooring systems, and general building work, this joist offers dependable performance where strength and consistency are required.

Each joist measures approximately 100mm x 47mm in section, often referred to as a 4×2, and is supplied in a 4.8 metre length. This longer length makes it particularly useful for larger projects where reduced joints and longer uninterrupted spans are beneficial. The consistent sizing allows for accurate planning, efficient installation, and compatibility with standard fixings and construction methods.

This product is graded as a C Grade structural joist. C Grade material is suitable for load-bearing applications where structural performance is the priority rather than visual appearance. Natural characteristics such as knots, grain variation, and surface markings are expected within this grade and are normal. These features do not affect the strength or suitability of the joist when used correctly.

The 4.8m 100×47 c grade joist is most commonly used in decking subframes. When installed at the correct centres and supported properly, it provides a solid framework capable of supporting decking boards and regular foot traffic. The 100x47mm section offers a good balance between strength and ease of handling, making it suitable for both domestic and trade decking installations.

The longer 4.8m length helps reduce the number of joins required in a subframe, which can improve overall strength and create a cleaner structural layout. Fewer joints also reduce potential weak points, contributing to a more rigid and durable finished structure. Where required, joists can be cut down to suit bespoke layouts or site-specific dimensions.

In addition to decking subframes, 4.8m 100×47 c grade joists are widely used in flooring structures for sheds, workshops, and garden buildings. They are also suitable for wall framing, stud work, and general construction tasks where a dependable structural component is required.

C Grade joists are valued for their cost-effectiveness and versatility. They provide a practical solution for structural work where appearance is not critical, such as areas that will be hidden behind decking boards, flooring, or internal linings once construction is complete.

Correct installation plays a key role in long-term performance. Joists should be installed on a firm and level base and fixed securely using appropriate structural fixings. For decking applications, joist spacing should be set in line with the thickness and type of decking boards being installed to prevent excessive flex or movement.

When used externally, it is important to ensure adequate airflow and drainage around the joists. Proper spacing and ventilation help reduce moisture build-up and contribute to the longevity of the structure. Any cut ends should be treated where appropriate to maintain protection and performance.

The 4.8m 100×47 c grade joist is suitable for both domestic and trade use. It is commonly selected by builders, landscapers, and DIY customers working on decking projects, garden buildings, or general construction work. Its longer length makes it especially useful for larger installations and more demanding structural layouts.

For storage prior to installation, joists should be kept flat and supported evenly to minimise the risk of twisting or bowing. During installation, care should be taken to ensure joists are level, square, and aligned correctly, as this will directly affect the quality and lifespan of the finished structure.

Using a 4.8m 100×47 c grade joist helps create a strong and long-lasting framework when installed correctly. Its consistent sizing, structural grading, and extended length make it a dependable choice for a wide range of construction and landscaping projects.

If you are looking for a strong and reliable joist suitable for decking subframes, flooring systems, or general structural construction, the 4.8m 100×47 c grade joist provides the durability and performance required for professional-quality results.