The joist which is obligatory accessories under the decking in order to balance the heating, restrict the deformation of the decking, be fulcrum to fix the decking board by screwing and to make the space for the escaping of water.
The samples must be used the joist: HD140x25, SD140x25, HD150x25, HD135x25, HD105x30, AT140x25
The joists have a lot of different height: 15mm, 20mm, 30mm, 90mm
Use the iron joist for the other height or the stairs.
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