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home improvement zone--YOUR HANDYMAN ZONE!
Roof has a blister/big bump.
Tools / Materials (See Below for
You find that your flat roof has a sizeable
blister or otherwise big bump; it's not only a visual annoyance, but
also potentially detrimental to the sustainability of the rest of
the roof over time. A quick way to fix this is to first assess
the severity of the blister and then make the necessary repair, as
may be applicable, including, if appropriate for your roof-blister
fix, properly applying some roofing membrane over the affected area
like putting on a bandage, except it is permanent.
Caution: When dealing with chemicals in products,
such as roofing cement, and sharp objects, such as a carpenter's knife, make sure you take precautions;
read all product manufacturer instructions.
Fixing a roof blister can be done in a
few steps, and here's how:
Using a stiff
bristle brush, brush clean the blister area of the roof.
Next, assess the
blister of the roof: By pressing down on the blister, if
you hear a soft, splashing--squishy--sound, the blister will
definitely have to be fixed; if you hear nothing at all, you may
just want to let the blister be without attempting to remove the
blister eyesore so long as the inside is not wet (because of no
squishy sound when the blister is pressed upon).
If you hear a
squishy sound coming from the blister, you'll need to make
preparatory incision: Using a carpenter's knife, slit the
blister open so that the inside can dry.
Once some time
passes by--preferably 24 hours--to allow the inside of the
blister to dry after having cut a slit in it, you'll need to
fill up the inside of this cut blister and the surrounding sides
of this blister with roofing cement. To do this the most
efficient way, with a caulking gun, cocked with a caulking tube
of roofing cement, stick the front tip of the caulking gun in
the incision of the blister in order to start filling up the
blister and the surrounding sides with such needed cement; read
product manufacturer's instructions as needed.
Upon filling the
blister with roofing cement with a caulking gun, carefully
smooth the outer layer of the roofing blister flat as much as
possible; to flatten it out, gently use a putty knife or joint knife,
as may be necessary.
Next, secure the
slit of the blister--stuffed with roof cement underneath, as
previously noted--by driving in roof nails along the sides of
the slit with a hammer.
Cut a piece of
roofing membrane that is about three inches longer on all sides than
that of the slit of the blister. Then set this cut-to-size roofing
membrane piece to the side for the time being.
With a putty
knife or joint knife, spread an ample amount of roofing cement
over the roof nails and blister slit; overall, in preparation to
be covered by the cut-to-size roofing membrane, an ample amount
of roofing cement should roughly cover the area of the size of
the cut-to-size roofing membrane.
Next, get a hold
of the previously cut-to-size roofing membrane and place it over
the area--the blister slit at the center--that has been covered with roofing cement.
Make sure that the roofing membrane is gently
padded down to eliminate any bumps or other abnormal spots; the
roofing membrane should be left with as a smooth of a surface as
possible, so as to conform with the rest of the roof as much as
Finally, apply yet another layer of the
roofing cement now over this newly installed roofing membrane,
making sure that the cement covering is level and that it
extends at least two inches over the edges of this roofing
That's what it takes to fix a roof blister/big
Handyman Zone Team
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