Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are.
How to install metal roof panels under deck.
Place them directly onto purlins that are attached to the roof trusses beginning on the outside edge.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Install the purlin along the house and the outer purlin.
Work toward the ridge.
First mark all the purlin locations on the deck joists.
Overlap the edge of the roof by 1 inch.
For a house roof the recommended minimum slope is 2 5 vertical inches for every horizontal foot but a nearly flat roof is fine for under deck installations.
Place the first screw.
These will stop the entry of rain wind and pests.
Lower than the purlin along the house 12 x 1 4 3.
Space the screws about 12 in 30 cm apart.
Install the first metal panel on the low end of the roof square to the eave.
Use your neoprene washer head screws to secure the metal to the sheathing.
For exposed fasteners avoid over tightening the fastener.
Install the roofing screws vertically along each rib in the panel.
Step 2 install a wood support structure for your panels screwing a row of 2 by 4s running parallel to your wall every 2 feet along the underside of your deck.
This is part 1 of a 6 part video series explaining how i installed a metal roof on my house.
In this video i cover measuring the roof figuring the metal th.
If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.
Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.