Corrugated sheet roofing.
How to shape purlin for corrugated roof.
Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.
In corrugated sheets the corrugations shall be uniform in depth and pitch and parallel with the side.
Corrugations should run in a straight line between the highest and lowest points and at a right angle to the purlins the intermediate supports.
Corrugated sheet roofing material is widely available and easy to use.
However if your metal roof has another supporting method the exact spacing is not.
The distance lengths are often based on the roofing panels size.
How to install purlins.
The g s sheets shall be fixed to the purlins or other roof members such as hip or valley rafters etc.
Overlap roof panels one corrugation away from prevailing wind and nail to rafters starting from one end.
Apply front and back panels similarly to side walls.
They give added support to the roof and also provide a nailing surface for the end panels and drip edge.
With galvanized j or l hook.
Cut to fit pitch of roof and around vent.
Proper spacing will offer attachment security that resulted in optimal stability.
Adjust door construction to desired size.
In order for the sheets to be easily fixed to the purlins as a rough guide they should be at least 50mm wide.
To install corrugated roofing start by cutting your panels to length with an angle grinder.
Metal roof purlins are installed horizontally under metal roofs.
Flashing is metal trim that fits over joints where two sections of roof meet.
Purlins are 2 by 4 feet and are installed much like metal roofing.
Bend the flashing into a v shape to fit over the top roof ridge and the corners where the panels meet.
The overlaps ends and sides depends upon the sloop of the roof.
The flashing should overlap the edge of the roof by one inch to help direct water.
They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.
It helps direct water away from the meeting points and keeps the roofing dry.
When positioned roof purlins should be spaced no further than 1 2 metres apart when using sheeting with a thickness of 0 7mm and 1 metre when using 0 5mm sheeting.
Install vent as close to roof peak as possible.
