Design your oak roof truss

Pick a truss. Set the span and pitch. See it in 3D. Then send it to us for a quote.⁠​‌​​‌‌‌‌​‌​​‌​‌‌​‌​​‌‌​‌​​‌​‌‌​‌​‌​‌​‌​​​​‌​‌‌​‌​‌‌​​​​‌​​‌‌​​‌​​​‌‌​‌‌‌​​‌‌​​​​​​‌‌​‌‌‌​​‌‌​‌‌‌⁠

Tie beam0
Principal rafters0
King post0
Truss height0
Span between walls0
Length inside end walls0

Size and shape

Measured between the inside faces of the walls the trusses sit on.

How far each end of the tie beam (the bottom beam) sits on its wall.

Measured centre to centre. Tell us if you want a ridge and purlins (roof beams) between them.

Truss details

Slimmed by 50 mm each side in the middle. Full width at the top and bottom, where the rafters and struts join.

Set 0 for a straight strut. Curved struts are cut from a wider board.

How much the tie beam curves up in the middle, up to 125 mm. Both edges curve. Set 0 for a straight beam. Curved ties are cut from deeper oak.

Ridge, purlins and walls

On the rafter backs: the purlins sit on top of the main truss rafters. The roof rafters sit on the purlins. Tenoned: the purlins are jointed into the sides of the main rafters, with the tops flush. The whole roof frame lies flat.

The ridge and purlins run from truss to truss. A gable wall stands one spacing past the end truss, and they rest in it. A hipped end finishes half the span past the end truss. The hips meet on that truss.

The tie beams are notched into the plates.

Timber sizes

Send us your design

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Oak roof trusses, designed by you

Design an oak roof truss to your own span, pitch and timber sizes, see it in 3D, and send it to us for a priced quote. Every truss is cut on our Hundegger CNC in Sussex and supplied as a numbered kit, with the joints and drill holes already made.

  • Oak king post truss without struts

    King post

    A single central post from the tie beam to the ridge. Simple and strong, it is the classic choice for porches, garages and smaller rooms.

  • Oak king post truss with angled struts

    King post with struts

    Angled struts run from the foot of the post up to each rafter. They carry wider spans and give the traditional oak truss look.

  • Oak queen post truss with two vertical posts

    Queen post

    Two posts instead of one, leaving the centre open. A good choice for wider rooms, barns and open plan spaces.

  • Oak truss with curved queen posts

    Queen post with curved braces

    Braces that curve up to the rafters. A softer, more decorative shape with more headroom through the middle.

Any king post can be fluted: slimmed between the head and foot and left full width at the joints, a detail that stands out in a vaulted kitchen or living room. You can also raise or camber the tie beam, and add a ridge, purlins and oak wall plates.

How it works

  1. Set the size. Enter the span between your walls, the roof pitch and how many trusses you need.
  2. Choose the details. Pick the truss style, adjust the timber sizes and turn the model in 3D.
  3. Send me a quote. Add your details and send the design. It reaches us with every dimension included.

We check every design carefully before quoting, then send you a priced quote with drawings. If you are happy, we confirm the details and your trusses go into production. Our lead time is 8 to 10 weeks from order.

Oak roof trusses in a vaulted room

Not sure how ordering works?

Our step by step guide explains the design, quotation and order process, and what's included in the price.

Many more styles and sizes. Bespoke Oak Trusses up to 11m

We manufacture custom trusses and complete roof systems in solid or engineered oak, fir, glulam, KVH and CLS, with spans possible up to 11 metres across a wide range of configurations, including raised tie, loft, restricted height and scissor trusses.

All components are designed using 3D CAD/CAM for millimetre-accurate CNC manufacture and supplied as coordinated packs for efficient site assembly. For more inspiration, explore the Roofs & Trusses gallery on our main website.

The technical stuff.
Getting the structure right.

Our truss designer is a first step to help you visualise your roof and get a quote in 24-48hrs.

Trusses are structural, so it’s important to get them right. Please read our guide to the technical aspects of truss design.

If you need a second opinion, your builder or engineer can advise, or you are welcome to call us on 01444 44 00 11 and talk it through.

Oak truss assembly & delivery

As a rule we supply trusses in kit form to be assembled on site. Prior to delivery it's important to ensure transport vehicles have good access to your building site. You or your contractor will also need to arrange suitable lifting equipment to move the structures to their final location.

However, if you require the truss to be supplied assembled before transportation to site, so that it can be lifted straight into place by crane, this can be arranged for an extra cost.

Oakmasters does not offer installation services. You will need to find your own independent building contractor for all general building work such as groundworks, foundations, wall building, roofing, services, insulation, rendering and any other construction work.

With that said - we are here to help and would be delighted to advise and assist you with any step of the process.