Step 2 take measurements.
How to install tin roof under deck.
First mark all the purlin locations on the deck joists.
Then stretch a string between them.
Mark the porch with a line parallel to the edge farthest from the house.
Position the next panel further from the house but overlapping the first by at least 6 inches.
How to build a tin roof over a deck step 1.
For an r panel style you will need to install it with 5 16 inch lap screws.
However with a seamed or crimped roof style you won t need screws.
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.
Mark the line 2 inches in from the.
Install subsequent rows of panels working your way to the downwind side of the deck s lower surface until finished.
Place the first screw.
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.
Install the roofing screws vertically along each rib in the panel.
Lower than the purlin along the house 12 x 1 4 3.
Secure it in the same manner as the first.
For example assume the porch measures.
If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.