
1) Cover work 2) Material 3) Shingles or slate 4) Shingles or tiles 5) Shingles 6) The craft of a roofer 
Found on 
https://www.crosswordclues.com/clue/roofing

1) Slate 
Found on 
https://www.crosswordclues.com/clue/roofing

• (n.) The materials of which a roof is composed; materials for a roof. • (n.) The act of covering with a roof. • (n.) The wedging, as of a horse or car, against the top of an underground passage. • (p. pr. & vb. n.) of Roof • (n.) Hence, the roof itself; figuratively, shelter.
Found on 
http://thinkexist.com/dictionary/meaning/roofing/

These roofing shingles contain solar cells and produce electricity Roofs play a key role in protecting building occupants and interiors from outside weather conditions, primarily moisture. The roof, insulation, and ventilation must all work together to keep the building free of moisture. R...
Found on 
http://www.daviddarling.info/encyclopedia/R/AE_roofing.html
 Roof'ing  noun   1.
Roof'ing  noun   1.  The act of covering with a roof.  
 2.  The materials of which a roof is composed; materials for a roof. 
 Gwilt.   3.  Hence, the roof itself; figuratively, shelter. 'Fit 
 roofing gave.' 
 Southey.   4.  (Mining) The wedging, as of a ...
Found on 
http://www.encyclo.co.uk/webster/R/92

[
n] - material used to construct a roof 2. [n] - the craft of a roofer
Found on 
http://www.webdictionary.co.uk/definition.php?query=roofing
 noun
 noun the craft of a roofer
Found on 
https://www.encyclo.co.uk/local/20974
  No exact match found.