Measure the roof area.
How to install metal roofing on your house.
Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it.
For exposed fasteners avoid over tightening the fastener.
Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are.
You will need to order enough metal material to cover the entire roof and this process.
Screw in the next sheet making sure that it overlaps the first sheet.
Space the screws about 12 in 30 cm apart.
Start with one side of the house at the top of the roof.
Use your neoprene washer head screws to secure the metal to the sheathing.
Remove the old roof.
Screw a metal sheet into the wood of the roof through the tarpaper.
Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.
Most codes now allow no more than two layers of roofing before requiring a complete tear off.
Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.