Crest Fixing or Valley Fixing?
When fastening profiled metal sheeting, crest fixing means securing the sheet through the upper ridges (crests), while valley fixing secures it.
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When fastening profiled metal sheeting, crest fixing means securing the sheet through the upper ridges (crests), while valley fixing secures it.
As with fixing all types of roofing material, there are certain guidelines to follow on how to screw polycarbonate roofing,.
Timber construction screws – types and applications Unlike ordinary wood screws, which come in handy when performing assembly work,.