All scarf joints serve the same purpose- to join two timbers together to span a distance greater than the dimensions of your lumber. There are many variations on the basic scarf joint, and this under squinted stop splayed scarf joint is one of them.
To what does the name of this joint refer? Well, the splay is the diagonal cut creating the surfaces to be joined. The under squinted stop is the thickness at the end of the splay, which is angled back a bit (the under squint). This little angle helps to create a stronger joint, and also adds a pleasing visual detail.
Typically, how long is the scarf joint? For example, if I need to get a 24′ length by scarfing two shorter timbers, how long is the overlap? Or, in other words, how long do each of the shorter pieces have to be to make a strong joint?
2’6″ is a good size although you can have a range between 2′ and 3′.
Thanks!
Just asked a question, eg are these scarf joints allowable, or covered, also under AS (Australian Building standard, current one)?
In our case it only needs to lengthen a corner verandah post (90 mm) for a sm verandah, to fix a screen to neighbours onto it (eg light Laserlite only).
Would appreciate quick answer, thanks already again!
I am not familiar with AS codes and standards. Best bet is to find an engineer in your area to take a look at it.
Do your plans include details about how to actually cut joints like a scarf when it’s in the plan?
Our plans include piece drawings of every timber, with dimensions for all the cuts. There are many Youtube videos showing the cutting process, and we have lots of information ion this page.