Question 1

What size TR26 trussed rafter do I need in the UK?

Accepted Answer

TR26 trussed rafters are typically supplied in 35×97, 35×120, 47×97, 47×120 and 47×147 mm sections. The correct size depends on span, spacing and load — verify against TRADA published Eurocode 5 (BS EN 1995-1-1) span tables and your structural engineer's calculations for Building Control approval under Part A.

Question 2

What spacing should TR26 trussed rafters be installed at in the UK?

Accepted Answer

UK trussed rafters are typically installed at 400 or 600 mm centres. 400 mm centres are the most common in residential construction and align with standard 1200 mm wide plasterboard sheets.

Question 3

Does TR26 timber comply with UK Building Regulations?

Accepted Answer

TR26 trussed rafters are designed by TRA-member truss fabricators to BS EN 14250 (with legacy reference to BS 5268-3) and supplied with full design calculations and an Origin Certificate, which Building Control accepts as evidence of compliance with Part A of the Building Regulations (Structure) in England & Wales — equivalent provisions apply under Section 1 of the Scottish Technical Handbook and Part D in Northern Ireland. NHBC Standards Chapter 6.4 sets the practical specification baseline for warranty providers.

TR26 trussed rafters span tables (UK)