For laying the material in the corners internal and external it must be cut as a larger sheet and then to be stuck overlapped.
How to lay roll roofing on a flat roof.
Align the length of roll roofing with the lowest edge of the flat roof and flush to the side edge of the roof.
Pull back 6 inches of the release paper in order to position the start of the roofing sheet accurately.
Roll out the first sheet and ensure that it lies flat and even.
Place the first layer of rolled roofing on the roof.
As you place the rolled roofing down stretch it to get rid of wrinkles and creasing.
Use a trowel to spread roofing cement over half or more of the strips.
Apply about two inches worth of cement under either side to seal the roofing down and then nail it down making sure it still stays flat and even as you go.
Add a second piece of full width roll roofing over the first.
Nail the roofing in place with short roofing nails spaced 6 inches apart and 1 inch in from the outer edges of the roll roofing.
Push the rolled roofing down into the wet cement to secure it to the roof.
To lay the rolled material on the parapets cut a piece of the desired length then mechanically attach it to the top edge of the parapet then glued to the base fabric fusing.