it comes to roof ventilation there are as many types of roof
ventilators as there are cultures.
All roof ventilators are developed to work in one climatic region,
or another, and a great many are designed on appearance and
cost, as opposed to performance.
they are considered a necessary evil, a product that has become
a necessity in principle, a have to have, in order to comply,
with the building regulations of the day.
vents are one such product, an item seen to satisfy the building
code which is ironic as the building code is assembled by those
who know little or nothing about roof ventilation and then are
blindly followed by council authorities who know even less.
ridge vent provides you with an opening in the roof. Nothing
more, nothing less. It will relieve pressure but it's responsiveness
will be dependent on the resistance within the design.
It's function is presumed to be sufficient to the use of the
building but always falls short to expectations. Why?...because
it's a product manufactured to a price in both construction
and ease of installation.
as there are cars and there are cars....the same applies to
all products bearing the same descriptive title....roof ventilators
are no different
Given the ratio of cost to performance is so disproportionate
one wonders as to why one is chosen other than to have something
with a seemingly diminished presence as regard to aesthetics.
In order for a ridge vent on a residential dwelling to be efficient
the opening needs to be such that the free air flow has to overcome
the resistance within the design.
when it's discovered that there's a short fall in performance
the developer / builder / owner seeks alternative products to
supplement that which is lacking. No thought is given to the
fact that you cannot successfully merge the dynamics of one
type of roof ventilation with another, and so the blind just
continue to follow the blind and hope they find themselves on
a far away beach when all comes to light.
an expert until it comes to taking responsibility then only
the trail seen is that of the 'roadrunner' in the direction
of the setting sun.
to this, the ability to close off a ridge vent so as to use
the roof as a heat exchange during winter is nigh on impossible
and at great expense.
ridge vent is not suited to houses in Australian conditions
and is only chosen when a diminished visual presence is sought
at the expense of performance