Because no one has responded the first time around, let me post my
question one last time before I give up:
I need to know the way to install a roof vent guard over a round roof-
mounted vent fan.
The round roof-mounted vent fan has a screen covering the air outlet.
But the screen has no frame to stiffen it. Consequently, squirrels
push the screen away easily. They lived inside the roof for some time
until I finially get rid of them. Now, I am sure that no squirrel is
inside my roof any more. I need to keep any new comer away.
I want to install a square steel cage over the round roof-mounted vent
fan. The problem is that I cannot find any instruction about
installing it anywhere in internet (they only say that it is easy to
install). Therefore, I am not sure if this is something that I can
do. I don't want to nail it in place because I am afraid that I may
add a way for water to leak inside the roof through the nails.
One thing that I want to point out is that I have a very low pitch
roof. The roof doesn't have any shingle. It is covered with a thick
layer of roll-roofing. I am not sure if this makes any difference or
not. I want to mention about this in case this makes any difference.
Please tell me the appropriate way to install a steel roof vent
guard. Thanks in advance.
Unfortunately there is no "standard" way to install such an item as there
are many problems to overcome: what attachment points are available? what
shape is the fan unit? what area is to be covered? is the fan unit installed
on a curb? Do you have a guard or must you build one?
A photo may be useful, but it is probably one of those things that one needs
to be creative in designing, building and installing the cage on the fan or
on the roof. Experience and adaptability are requirements of the installer,
anything we say over the internet is of little practical use if it doesn't
suit your needs or the conditions you are working with.
The roof vent guard that I intend to install is like the one shown in
My round roof mounted vent is just like the one shown in the picture.
It has a fan inside. The idea is to use the "roof vent guard" that is
a steel cage to cover the round roof mounted vent. You can see from
the picture that the flange of the roof vent guard has a serie of
holes in it (other models from other web sites also have similar
holes). This seems to suggest that I am supposed to nail it in
place. I will need to give this whole idea a second thought because I
am afraid that all these nails are going to give rain water a way to
leak inside my roof.
I may just have to follow the other newsgroup member suggestion to
stiffen the screen that is already there. I intend to remove the
screen and see if I can stiffen it later today.
How about replacing the existing screen with something more substantial? I
bet the original was designed to keep out leaves, maybe insects, but yielded
to the attacks of a tree-rat.
You could use the existing screen as a template to cut a replacement from
hardware cloth, rebar, or similar.
Can you provide the name/model of the existing fan? That way we could look
at the manufacturer's picture and maybe come up with some other ideas.
Sounds good. He mght also be able to attach the new screen to the old
SEe what hardware stores sell for screen. What does one call the
heavy screen with 1/2 x 1/2 inch holes? We used it on a back door
with a window to keep a burglar from breaking the window and opening
I am likely to do just that. Thanks for the suggestion.
The steel cage that I originally wanted to buy to cover the round roof
mounted vent has flange all around that has a serie of holes on it. I
believe the steel cage (called roof vent guard) is meant to be
attached to the roof using nails based on the fact that the flange of
the steel cage has so many holes on it. This is just a guess. I just
don't like the idea of shooting that many nails into my roof (this has
rool roofing kind of like a rubber roof). I am afraid that I may end
up making many ways for rain water to leak inside the roof.
Therefore, I am thinking of stiffening the existing screen inside the
roof vent instead of using a steel cage.
The existing metal screen is under the round roof vent cover. The
screen is placed vertically, and is attached to vertical steel rods
that is positioned around the round vent hole. The rods supports the
round vent cover. Unfortunately, the screen is not stiffened by any
flange around it. It is good enough to prevent leaves and insects
from getting inside the roof. But it is not stiff enough for small
animals like squirrels. A squirrel can simply push the screen aside
and gets inside the roof.
Later today, I will remove the existing screen from the vent, and use
it as a template to cut a sheet of heavy gauge metal screen. Then I
intend to combine them together. The existing screen will continue
serve as a way to keep leaves and insects away. The heavy gauge metal
screen will be the backing of the existing screen in order to stiffen
it. Seem like this will be the easiest way to do.
Thanks for the suggestion again.
Thanks for your suggestion of using the existing screen as a
template. Yesterday (before the snow storm hit my area), I remove the
existing screen as a template, and use it to cut a piece of heavy
gauge metal screen. The wire in the heavy gauge metal screen is vinyl
covered and should last very long. I cut the piece a bit taller than
the air opening; I use the "extra" material as a kind of bar wire by
cutting the extra material into pointy wires sticking outward and
upward. This should discourage squirrels from touching the screen.
This heavy gauge metal screen is very stiff. Now I am sure that
squirrels won't be able to push through this screen.
I am glad that I have fixed it. Not only I can prevent squirrels from
getting into my roof, but also I may have saved the motor in the roof
vent fan. What's happened is that there was little margin between the
original screen and the fan blades. When squirrels pushed the
original screen inward, the original screen got tangled up with the
fan blades. If the weather was hot, and the roof vent fan started
working and the fan blades would get stuck, the fan motor would become
damaged. Hopefully, the fan motor is OK.
Actually I am not 100% done yet. Because I have positioned the new
screen a bit further away from the fan blade, the original screen is
too short now. I will have to replace it with a long one. I will
have to wait until the snow and ice has completely melted before I
will continue. But for the purpose of keeping squirrels away, I am
Again, tahnks for your suggestion.
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