Having met Knyph, talked with him and seen his expert handling of ropes of all sorts experienced his knowledge of knots....I would tend to listen to his advice as his has had many years experience in this his specialist field.
The thread is about opinions on the best way to put up a tarp and the knots to use
As a Sea Scout leader for many years, I too taught knotting (at a basic level) and have seen reef knots capsize in use.
If you use the correct knot then things have a chance to survive when an incorrect knot for the aplication is used.
I understand that reef knots are so called as they were used to reduce the sail area of a sail by tying folds in it with bits of rope sewn to the face of the sail...and were seen as fairly weak, easily undone knots for temporary knots!
A tarp in a gale behaves somewhat like a sail

:yikes:
Sheet bends were designed to bend (join ) two sheets (ropes) so the clue is in the name...
Try using bends to join things - you will find they work best!
When I am looking for advice I tend to respect the advice of acknowledged and experienced experts over the opinions of students of other disciplins....
However -, having said that, my favourite way of putting up a tarp is to wack a round turn and two half hitches on to tree A and use what I know as a "Hammock Hitch" around tree B (wrap a turn around the tree, under then over the standing part, back around the tree, under and over the standing part and finish with a double tucked quick release).
I will be trying out the method suggested by Knyph as it sounds very strong and yet easy to release (the round turn etc can sometimes be a pig...) It is always good to learn from a master!...(even if he does give you the brush off sometimes

)
Many thanks for the advice K-NYPH.
I then use mini prussics and crabs to arratch the tarp to the ridgeline with they taughtline jobbies on the guys (which attach to the tarp via tent rubbers)...or I use bungies!:yikes: