IG Timber Frame Lintels - Standard / Heavy / Extra Heavy Duty

Description

All IG timber frame lintels satisfy the thermal performance requirements of Approved Document L of the Building Regulations (E & W), Northern Ireland’s Technical Booklet F and Scotland’s Technical Handbook, section 6. Provide a damp proof course / cavity tray over all lintels. 

For more detailed information applicable to a particular wall construction, contact IG Lintels Technical Department. Refer to manufacturers literature for details regarding lintel ranges, height, thickness and uniformly distributed load (UDL) figures.

Application

• Timber frame lintels for use in an external timber frame cavity wall construction above window and door openings.
• Cavity widths greater than 50 mm.
• Lintels should be installed with a minimum end bearing of 150 mm, bedded on mortar and levelled along its length and across its width.
• The masonry above the lintel should be built in accordance with BS EN 1996-2.
• 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.
• IG timber frame restraint clips are supplied free of charge and must be fixed to the timber frame structure by 3.3 x 50 mm galvanized nails. Lateral restraint clips should be placed at 500 mm centres each side of mid span.  
• NHBC & LABC recommend a damp proof course (DPC) or cavity tray should be installed over all openings in external cavity walls.
• Allowance should be made for the movement of the timber frame structure due to settlement and shrinkage. 
• Masonry should be laid on a mortar bed and all perpendicular joints should be filled.
• The external lintel flange must project beyond the window/door frame and it is recommended that a flexible sealing compound is used between the underside of the lintel flange and the frame. 
• Do not cut lintels to length or modify them in any way without consulting an IG engineer.  
• Masonry should not overhang any flange by more than 25 mm.  
• The practice of propping a lintel is sometimes used to facilitate speed of construction. It should only be introduced after initial masonry load has been applied to the lintel. 
• Stop ends are required at each end of a lintel to prevent moisture cascading over the ends into the cavity and onto the inside wall.
• At least two weep vents are required per opening and positioned not more than 450 mm apart. 

Product Links

• https://iglintels.com/lintels/standard-lintels/timber-frame-lintels/standloa/
• https://iglintels.com/lintels/standard-lintels/timber-frame-lintels/timber-frame-l7hd/
• https://iglintels.com/lintels/standard-lintels/timber-frame-lintels/timber-frame-l7XHD/