How much endbearing is required for wood lintels to ensure stability?

Wood lintels are used to support the load of structures above openings such as doors and windows. Proper endbearing is essential to ensure that these lintels can adequately distribute the load they carry and maintain structural integrity.

The requirement for 1 1/2 inches of endbearing is based on industry standards which specify that this amount helps to ensure stability without overly compromising the aesthetics or design of the framing. This amount provides sufficient support while allowing for some degree of movement and settling, which is normal in any structure. Adequate endbearing helps to prevent issues such as cracking or sagging over time, which can arise if the lintels are not properly supported.

In contrast, other amounts suggested, such as 1 inch, are generally considered insufficient for supporting the load adequately, while 3 inches and 4 inches may provide excess support that isn't typically necessary for standard applications in residential construction.