Actually no one can say it is better then the methods you mention, it is
just a matter of perspective. It's just "another tool in the box"as they
Glue joint strength depends on, besides correct milling, glue area and grain
orientation. Consider the loose tenon in the order of strength of a regular
M & T joint. In many cases, face frame construction for instance, a M $ T
joint is overkill and dowels or biscuits would be more then adequate.
However, on beefier construction one may want the strength of a mortise and
tenon type joint. In these cases, and don't ask which ones, that's a
judgment call on the part of the guy building the piece, the loose tenon kit
will give, for all practical purposes, the strength and racking resistance
of a regular M & T joint and, because of the jigs, it's easier to
make.Another point for the loose tenon joint is it cuts down on the amount
of, usually more expensive, primary wood since the pieces can be cut to
exact size and a less expensive wood is used for the loose tenon.
So, the loose tennon and/or M & T joint isn't necessarily better, just, in
some cases, more appropriate.
If it helps, and for an example, I am currently building a set of Dutch
Doors. Since I know that the full weight of the doors will be hanging off
only the hinge side stiles for the next, hopefully, couple of decades. and
that this makes the doors prime candidates for racking over time. Would a
double biscuit joint hold up and resist racking for those decades?
Frankly I don't know and I don't want to find out the hard way. Consequently
I chose conventional stub tenon joints. With that joint I know it won't rack
I should also add that the wife had me out looking at a lot of doors. I
noticed that every one of those doors I looked at still used M &T joints in
the construction even though biscuit joints are less labor and time
intensive as well as what it saves on primary stock. If a company that turns
out thousands of doors passes on savings in labor and materials I figure
they must have a good reason. .
Hope it helps
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