"G&M" wrote in message
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"Hugo Nebula" abuse@localhost wrote in message
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A prestressed lintel _can_ be composite or non-composite. Composite
lintels need the action of three courses of brickwork (or two of
blockwork). These are usually the 65mm deep ones. Non-composite
don't need the masonry above, and come in depths of 100mm or more.
Yours are, therefore, composite ones.

Nope - mine is the Naylor P100 which I believe are non-composite. However
I
will check this with them tomorrow just to make sure.

Checked and can confirm all Naylor lintels are non-composite and do not need
three layers of brick or any other method to give them their quoted
strength. Joists or other point loads can be lain directly on them within
the loads given in the tables on their website.