| 摘要 |
The present invention relates to sealing membranes. It relates in particular to a sheet for the production of semi-independent sealing membranes of the type comprising a bituminous sealing layer 1, a protective facing 3 made from mineral flakes which is laid on the upper face of the sealing layer 1, a welding film 4 laid on the inner face of the sealing layer 1 and which has, on its lower face, identification marks 5 indicating the surfaces to be welded during the installation of the sheet, characterised in that the said identification marks 5 form a continuous pattern constituting a rupture-free welding path. <IMAGE>
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