The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacturer has testing for their roofing panels and then the metal is installed to the purlins.
Putting tin on roof.
A metal roof can be durable but it needs gutters to help prevent damage from rainwater.
It creates an air gap between the back of the metal and the shingle roof which allows for airflow.
Before you install metal roofing repair any damage to the wood under the shingles.
The panels that make up the roof fit together like pieces of a puzzle snug and tight.
There s already plenty of advantages by choosing a metal roof and there s even more when you decide to put a metal roof over shingles.
For instance you ll.
However with a seamed or crimped roof style you won t need screws.
For an r panel style you will need to install it with 5 16 inch lap screws.
If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch.
Position it so it overhangs the edge at least 4 inches.
The second way to install a metal roof over a shingle roof is with the use of purlins or battens.
Finally install the metal panels image 1 placing metal closures on the top and sides of the roof structure to hold the panels in place.
Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging.
Advantages of metal roofs in general.
This method has its benefits as well.
Lay the first piece of tin roofing in a bottom corner of the roof.
It provides a solid flat surface to attach the new metal roof to.
Place corner pieces where panels will meet bends at the edge of the roofing.
Step 1 select a tin roof type decide what type of tin roof you want by selecting either an r panel or v crimp style.
Next use 1 inch nails to secure some metal edging to the perimeter of the roof.
To keep it strong for many years to come make sure that you have the right support systems for your roof.
Step 2 take measurements.
Secure them with clip fasteners image 2 not screws penetrating the metal panels themselves.
Slide a washer onto a 1 1 2 inch wood screw and drive it through a low.
Then cover the entire roof with a layer of insulation and secure it with a staple gun.