Older rain caps for metal chimneys and flue liners can deteriorate or fall apart, but installing a replacement cap is as easy as climbing onto the roof.
By the DIY experts of The Family Handyman Magazine:February 2014
Slide the new cap into the flue. If the
stub section on the cap is too large, crimp
it with a crimping tool.
Plumb the cap so it fits squarely in the
flue and secure it with one sheet metal
screw. Recheck that the cap is plumb and
install two more screws.
High winds, sleet and plain
old corrosion can cause a rain
cap to break apart, rattle and
leak water into your home. If
you feel comfortable climbing
up on your roof, you can
replace the old one yourself
for about $40. That’ll save
about $150 in labor from an
HVAC service company.
You can buy a new rain cap
and a sheet metal crimping
tool at any home center. Flues
are usually 5 or 6 in. in diameter,
so buy both size caps and
return the unused one. You’ll
also need three hex-head or
Phillips self-drilling 1-in.
sheet metal screws and a drill
Remove the old rain cap
and toss it. Select the correct
cap and check the fit (Photo 1).
Then secure the new cap
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
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