Joists
We distribute MiTek Posi-Joists and Metsä Wood Finnjoist I-Joists, along with ancillary products such as firring timbers and chipboard flooring, throughout mainland UK.
We distribute MiTek Posi-Joists and Metsä Wood Finnjoist I-Joists, along with ancillary products such as firring timbers and chipboard flooring, throughout mainland UK.
Unlike many suppliers, we take you through the complete process including design, manufacture and delivery along with providing comprehensive after-sales support. Each project that we undertake is fully compliant with health and safety standards. Additionally, we are registered to ISO9001, so you can be sure that all the work we carry out is to the highest standard.
To provide the safety information where it’s needed most, all handling, storage and installation information is printed on the reverse of the installation drawings. This ensures that the installers have the right information, at exactly the right time. If the customer or the installer feels that they require additional information they can use the following links.
Find out more about Posi-Joist from MiTek using the technical links below.
Our Joists are also CCPI Approved - helping to provide greater confidence to product users that the product information is clear, accurate, accessible, up-to-date and unambiguous.
Choose your joist system
Every system below is one we design and supply. Select one to see its geometry and the clear spans and depths held on our current rate matrix.
- Max clear span
- 8.00m
- Depths held
- 225 · 253 · 304 · 373 · 421mm
- Larger or bespoke
- Sizes outside this range are designed to order — just ask
More sizes are available than we show here — get in touch if you can’t find what you need.
At a glance
- Max clear span
- 8.00m
- Depths held
- 220mm – 421mm
- Systems
- MiTek Posi-Joist and Metsä Wood Finnjoist I-Joist
- Applications
- Domestic, apartment and office floors
Know your budget
Put a price on your floor in under a minute
Set your span, depth and quantity and the calculator returns an indicative price straight from our rate matrix. Excludes delivery and VAT.
Open the quote calculatorThese are our standard sizes — we design plenty more to order. Get in touch if you can’t find what you’re looking for.
From drawing to site
06 / PROCESS- 01 / 05
Design
We model your project from architect drawings, resolving spans, loadings and service routes.
- 02 / 05
Detailing
Everything is engineered and detailed, with layout and installation drawings issued for approval.
- 03 / 05
Manufacture
Posi-Joists are pressed with MiTek Posi-Struts on our lines; I-joists are cut to length from Metsä Wood Finnjoist stock.
- 04 / 05
Banding
Joists are checked, banded and labelled into site packs, with firrings referenced to the layout plan.
- 05 / 05
Delivery
Our own transport delivers to site, with handling and storage guidance alongside the drawings.
CCPI Approved
Our joists are CCPI Approved, so the product information you rely on is clear, accurate, accessible and up to date.
ISO 9001 registered
Quality management is audited end to end, from the design office through to the pressing line.
Responsibly sourced
Finnjoist I-Joists are sourced from environmentally legal and sustainable PEFC materials.
Common questions
Technical information
Technical documents coming soon. In the meantime, our design team can send drawings and datasheets for your project on request.
Joists range
04 OPTIONS
01I-Joists
At Donaldson Timber Engineering, we design all of our I-joist flooring systems using Finnjoist.
Read more02Posi-Joists
We design all of our Posi-Joist flooring systems using MiTek Posi-Joists.
Read more
03Firrings
Firring timbers are tapered sections used in flat-roof construction to create the required fall towards outlets or gutters.
Read more
04Chipboard Flooring
We partner with two chipboard suppliers, EGGER and West Fraser, supplying EGGER Protect, EGGER Peel Clean Extra and West Fraser CaberDek flooring panels.
Read moreNext step