i-Joists
Timber i-joist is an engineered timber joist which is used in the construction of floors and roofs for commercial and residential buildings.
I-Joists provide an alternative cost-effective solution to a traditional solid wood construction due to its lightweight and high strength properties, enabling longer and lighter spans with lengths up to 13m.
The design of the i-joists also helps create a quiet solution for floors with ‘squeak free’ joists and are ideal for flat or pitched roof structures. Once installed they can provide easy access for services such as wiring and plumbing. Our in-house team can also provide guidance on any hole/s which may need to be incorporated into the joists to cater for pipes and wires. This is recommended as calculations are required to determine the location/s and maximum size of each hole/s to ensure it doesn’t compromise our joists’ structure or key properties.
One key advantage is at Thomas Armstrong (Timber) Ltd, we supply all the relevant timber ancillaries’ items as standard. Depending on the timber product/s ordered, ancillaries items such as straps, hangers, timbers, truss clips, gable straps, valley gutters etc are delivered at the same time ensuring you have everything you need to complete the installation of our products on-site.
- Easy installation and handling
- Lightweight
- Quieter Floor Solution – no squeaky joists
- Engineered product that provides greater level of precision and accuracy
- Prefabricated components mean reduced site labour costs
- Easily transported and ready for installation on delivery
- Cost effective solution
- Increase dimensional stability over solid timber joist
- Long continuous spans and multi-spans
- House extensions
- Self builds
- Housing schemes
- Barn conversions
- Apartments
- Student accommodation
- Schools
- Nursing homes
- Hospitals
- Offices
Timber Frame Construction Stages
Below is a step by step to highlight typical key stages in the construction of a Timber Frame Structure
Set Out Base Plate
Install a timber plate to the concrete slab to establish the footprint and positioning of the structure.
Floor Joists & Decking
Install timber floor joists and lay first floor decking to create the intermediate floor level.
Roof Structure
Install the prefabricated timber roof components — typically roof trusses or rafters.
Ground Floor Walls
Erect prefabricated timber frame ground floor wall panels to form the base structure.
First Floor Walls
Position and secure the first floor wall panels in line with the building plan.
Completed Timber Frame
The full timber frame is now erected, forming the structural shell ready for follow-on trades.
See the Journey: Timber Frame Construction to Completion
Our Process
A clear step-by-step guide to how we take your project from enquiry to delivery — ensuring quality, communication, and reliability at every stage.
1. Initial Requirements Received
We gather the customer’s requirements and project objectives.
2. Quote & Preliminary Details Provided
A tailored quote is issued based on the initial brief and scope.
3. Order Confirmation
The client confirms the order and gives the go-ahead to proceed.
4. Final Details & Site Coordination
We liaise with the client to finalise details and arrange site visits if needed.
5. Manufacturing Begins
Products are manufactured in-house according to agreed timescales.
6. Delivery to Site
Completed products are transported and delivered to the specified address.
Contact Thomas Armstrong (Timber) Today!
At Thomas Armstrong (Timber) Ltd we pride ourselves on our high level of customer service across the company. Our friendly staff will be more than happy to help answer any questions you have relating to sales and our products as well as any technical advice you have. Please contact our office today!