without seeing your roof configuration.approximately 1sqft of ventilation per 150sqft of attic area and I say approx. because the pitch of the roof (amount of roof area exposed to the sun) climate (living in Florida as opposed to living in Maine) and orientation (north,south,east or west facing)several types of vents are soffit and ridge (under the eves and the ridge line of the home).gable vents (one on each opposing gable ends of your home) since you stated hip style roof this does not apply. box or dome vents ( mounted directly on the roof surface that allow superheated area to flow out) heat propelled turbines( the more heat in the attic the dome spins faster letting more heat out) .having no attic ventilation does cause heat related damage that make shingles wear out before their rating is reached and in areas where you have extreme ends of the spectrum condensation will bead up cause water damage to the interior of the home and black mold in only several weeks and cause the roof substrate to rot.my suggestion to you is to pick a pros brain have a contractor come out of your area and in form you of your options and types of venting options and the subsequent costs of each type available.them figure out if it, once informed of your options whether It is a DIY project for you
From: John and Carmen Stuart <johnandcarmen@bellsouth.net>
To: DoIt_Yourself@yahoogroups.com
Sent: Saturday, November 26, 2011 10:43 PM
Subject: [DIY] attic ventilation problem
After adding a porch onto a pre-existing 1955 built brick home with a
hurricane (hip) type roof, we are having
shingles that are turning dark and some heat-related problems in our
attic. It is dry up there but some painted metal things
have shown paint damage (curdling) due to excess summer
temperatures. This porch has been there for 11 years so this
didn't happen quickly. Before the porch was built there was no over-
heating in the attic for the previous 20 years we lived here.
When the new porch was added, no hole or breathing portal was created
on the preexisting roof.
carmen s.
hurricane (hip) type roof, we are having
shingles that are turning dark and some heat-related problems in our
attic. It is dry up there but some painted metal things
have shown paint damage (curdling) due to excess summer
temperatures. This porch has been there for 11 years so this
didn't happen quickly. Before the porch was built there was no over-
heating in the attic for the previous 20 years we lived here.
When the new porch was added, no hole or breathing portal was created
on the preexisting roof.
carmen s.
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