For example assume the porch measures.
How to install tin roof under deck.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
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.
Lower than the purlin along the house 12 x 1 4 3.
Step 1 select a tin roof type.
Measure the porch to find the best length and width for a tin porch roof.
Decide what type of tin roof you want by selecting either an r panel or v crimp style.
Then stretch a string between them.
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.
Install the purlin along the house and the outer purlin.
However with a seamed or crimped roof style you won t need screws.
If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.
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.
First mark all the purlin locations on the deck joists.
Position the next panel further from the house but overlapping the first by at least 6 inches.
Step 2 take measurements.
Place the first screw.