As an optional extra keystone box lintels can be insulated.
Steel lintel data sheet.
Zinc coating is galvanised to bs2929z2.
Stainless steel l strip s are also produced conforming to grade 304 s15 bs1449.
The keystone box lintel has perforations along its length acting as a plaster key.
All l strip s are manufactured from steel complying with bs en10025 with a minimum yield stressed of 275 n mm2.
Originally a steel fabricator for the area s mining and power generation industries the company made its first steel lintels in 1967.
Since then birtley has grown from reliable local supplier to a uk wide force in construction design technology and product development.
Box lintels can be used for internal or external openings and with a variation of wall thicknesses.
Birtley began life as birtley building products in 1965 based at the current site in county durham.
Lintel life span the ig lintel range complies with the technical requirements of the blp building life plans regarding the durability data of mild steel cold formed lintels.
Ig s lintels are insulated with expanded cfc free polystyrene and conform to bs 13163.
Ig lintels design manufacture and supply high quality steel lintels throughout europe.
Originally a steel fabricator for the area s mining and power generation industries the company made its first steel lintels in 1967.
Cn100 channel profile lintels for light duty loads in internal walls cn42c cn99 124c cn99 1644c standard duty classic box lintels cn50 cn51 external solid wall two piece inverted t lintels.
Keystone lintels limited is a leading manufacturer of steel lintels founded in 1989.
Founded in 1958 ig lintels is a division of europe s largest manufacturer of steel lintels and masonry support systems.
The brick slip soffit feature is bonded to the lintel.
The keystone box lintel is designed to carry the full load of wet masonry as soon as it is installed.
The history of keystone has been one of relentless expansion and continuous innovation whilst redefining the meaning of service in the lintel industry.
All fire rated lintels produced by naylor lintels comply with bs8110.