Timber Frame Lintels
Designed for use in timber frame construction the T/K lintels provide support to the outer leaf to brickwork over openings.
To achieve the loading tables shown the TK lintels must be secured with restraining clips and a timber batten (not supplied) must be used to prevent lateral deflecton (twist) during the building stage.
Installation of Keystone’s TK, HDT/K andXHDT/K are all similar.
All Timber frame lintels must be installed with restraining clips and a timber pinch batten to prevent rotation of the lintel during the building stage. Propping may be used to facilitate speed of construction.
To achieve the loading figures shown, the TK lintel must be secured with restraining clips and a timber pinch batten (not supplied) must be used to prevent lateral deflection (rotation) during the building stage. A single timber pinch batten 300mm long at mid span will be sufficient.
Keystone timber frame restraint clips are supplied free of charge and must be fixed to the timber frame structure by 3.3mm x 50mm galvanised nails. Allowance should be made for the movement of the timber frame structure due to settlement and shrinkage. Lateral restraint clip should be placed at 500mm centres each side of mid span.
Timber Frame lintels are manufactured from pre-galvanised mild steel BS EN 10346:2009 DX51D plus Z600 or grade Z275 to BS5977: part 2, 1983 (BS EN 845-2:2003). There is a minimum zinc coating of 600g/m² galvanising including both sides.
If stainless steel lintels are required:
Keystone utilise stainless steel grade 304 2b to BS EN 10088- part 2 Astm 240 (European Grade 1.4307).
Heavy Duty Timber lintels are insulated with expanded polystyrene and conform to BS 13163:2008.
Technical Information details all the specification clauses required for Keystone lintels. The Specification Clause required for Box lintels is titled “Timber Frame Lintels”.