A reader's Roofs and roofing question: Lap or cut roof sheets?

Michael   from   Perth W. Australia   had this question wether to lap or cut roof sheets.

I am installimg a garage roof. It is 6100mm long and will need 8 sheets of corrugated sheeting per side, which adds up to a length 6400mm.

My question is, will it be better to cut one sheet down to size to make it fit or to overlap an extra corrugation on about 4 sheets to get it to length.

Bill's answer

Hi Michael,
No, there is never any need to cut corrugated sheets on a roof.
We just overlap extra and screw through the two sheets.
That is, fix all your sheets in the normal way, and then just lap the last one.
That way you get your screw pattern OK on all but the last one.
Sometimes using corro on a wall we do cut them if it would throw the pattern of the screws out.
Cheers Bill.