We manufacture our timber roof trusses, attic roof trusses and engineered floor joists using the strongest grade of timber that is available to the UK market. There are many different types of timber available in the UK so we hope this page will provide you with some key pieces of information that will allow you to recognise the substantial differences between the timber we supply and the timber you may see in places such as your local builders’ merchants.
The first consideration to take into account is that all timber is allocated a stress grading. This process can be carried out visually but more commonly is done via machine. Each grade of timber has its own limits as to how much load the timber can withstand. The timber is also inspected to assess how many knots it has and the degree of wane within the timber. This gives us an overall idea about the quality of the timber.
TR26 grade timber has been a cornerstone product of timber roof truss manufacturing for a number of years and therefore is the only kind of timber that we use and provide for our customers. The TR26 grade timber that we sustainably source is in accordance with BS EN 14081, kiln dried and planed all round. These features provide several benefits such as being lighter in weight, stronger in application and improved dimensional stability all whilst being regularised to a consistent finish.
The TR26 Timber sizes that we have available are listed below for your reference. These are finished sizes but please keep in mind that they could be -/+ 3mm.
We usually opt for the 35mm thickness in timber when designing standard timber roof trusses. This could be for Fink Trusses in a house construction or Queenpost trusses for a garage. Meanwhile, the 46mm thickness option is used for attic trusses due to fire regulation guidelines. Equally, raised tie trusses that are anything more than 100mm off the wall plate instantly require the 46mm depth option.
We offer to pre-treat all timber products that we supply using our onsite treatment facility. If you do choose to have your roof trusses treated, we suggest adding a tin of cut end preservative (for a small cost) to your order for treating any structural timber that you may cut onsite for staircase infill, dormer infill or VELUX roof light infill areas.
Minera Roof Trusses are committed to ensuring all the timber we purchase is sourced from legal and sustainably managed forests. This means we only use suppliers that are certified to the PEFC scheme for responsible management of the world's forests. Finally, we are certified under the ISO 9001:2008 Quality Assurance Scheme which guarantees traceability of products and documentation within our organisation. You can read our sustainability statement.
Please note that the only rough sawn timber that we use is for stability bracing which is 100x22mm in line with size requirements as stated by the British Standards.
In mainland UK on trussed rafters and engineering joists.
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We supply a wide range of VELUX roof windows, sun tunnels, flat roof windows and blinds.