RIDGE VENTS:
(A.) Metal ridge vent basically allows hot air to passively escape from your attic by circulating cooler outside air in through the eave soffits vents below and then exiting through the highest point of the roof (fig. 1) .
Do It Yourself Roof Repair Metal Ridge Vent: Figure 1
The vent should be nailed into place at the peak through the roof decking and into the rafters or trusses below (fig. 2) .
Do It Yourself Roof Repair Metal Ridge Vent: Figure 2
If it is just nailed to the roof decking, the nails may work loose and cause premature failure to the vent (fig. 3).
Do It Yourself Roof Repair Metal Ridge Vent: Figure 3
When the ridge vent is loose, water can blow in and the wind can rip the vent tearing it from one end to the other (fig. 4) .
To prevent leaks, secure venting system quickly
Do It Yourself Roof Repair Metal Ridge Vent: Figure 4
Nails may be tucked temporarily under the shingles as markers to identify the rafter locations during the installation process (fig 5). 
Do It Yourself Roof Repair Metal Ridge Vent: Figure 5
Once the vent has been secured the nail heads should be sealed (fig. 6).
Do It Yourself Roof Repair Metal Ridge Vent: Figure 6
Rubber end plugs prevent water from entering once completed (fig. 7).
 Engineered rubber end cap construction Do It Yourself Roof Repair Metal Ridge Vent: Figure 7 Metal ridge vent, if applied properly, should not require any maintenance over the life of the roof. Nail length should be 1-1/4″ to prevent loosening. (B.) Shingle over ridge vent is more desirable due to curb appeal and also because it it is more wind resistant. I prefer using the hard plastic type along with 2 – 1/2″ nails.
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