Masonry
Chimneys
When you are working with
multiple flues it does not matter whether the
flues are extended or not when it is time to
order your chimney cap.
Single Flue Chimneys
With Extended Flues
These are the most common form of chimneys. The
flues of these chimneys extend out above the top
of chimney, which makes installation of a
chimney cap easier. The professional installer
needs simply to screw the cap to the clay or
ceramic flue. To ensure a good fit the outside
dimensions, both the height and width, of the
flue need to be measured. Flue caps come in a
range of sizes, so you need your measurements in
order to purchase one. The range that a
particular cap will fit is also dependant on the
length of the screws that will be used to fasten
it to the flue.
Single Flue Chimneys Without Extended Flues
If your flue does not extend beyond the top
of the chimney you will need a leg kit in order
to install your chimney cap. The leg kit extends
down into the flue and attaches to the sides.
While leg kits allow for easy installation of
chimney caps on flush chimneys, they will not
stand up to high winds. If you live in a high
wind area you will need to install your chimney
cap with more secure brackets. You will need
your chimney top measurements so you can
determine which cap size is best for you. They
usually fit a range of sizes. Some caps come
with screws on the outside. Dont worry; they
will still work properly if you are mounting the
cap inside the flue. You will need to measure
both the height and width of the flue opening
inside the chimney. You will then need to figure
out which size range works best for your
measurements. Do not forget to order either the
brackets or leg kit that work with your cap.
Multi Flue Chimneys With Or Without Extended
Flues
When you are working with multiple flues it does
not matter whether the flues are extended or not
when it is time to order your chimney cap. Your
first step is to measure the total exterior
width and length of all the flues combined, as
well as the height of the tallest extension from
the chimney. The flue you choose will need to
not only cover the height of the tallest flue
with the lid, but also fit inside your chimney.
As you will be mounting this cap directly to the
chimney crown it is very important to take the
screen height into account. To ensure proper
drafting you need to have at least 5 of
clearance between the top of the cap and the top
of the flue. If, for example, your highest flue
sticks up 3 you will need to have a screen
height of no less than 8 to have a 5 gap.
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