In an earlier contribution to this discussion,
Stuart wrote:

In order to give me more floor space in a spare room I am building
some shelves out of 2" x2" with boards across the top .
What i am proposing is to screw a piece in to the brick vertically
with another length on top (outwards ) with a third piece at an angle
from under the top piece to in front of the vertical piece to form a
triangular bracket .What i wondered was if there is any particular
formula for the sizes of each piece .I'll be making the top to suit
the board .They are 5.25" so i'll be using two of them to make a 10.5"
shelf.
tia
Stuart .

Sounds to me like a case of re-inventing the wheel. Why not just get some of
these - http://tinyurl.com/djves - 12 quid for 20? Screw the 300 bit to the
wall, and the 250 bit will nicely support the shelf. Depending on the length
and loading of the shelves, use 2, 3 or 4 brackets per shelf - as
appropriate.
--
Cheers,
Set Square
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