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Hey, you're in the home improvement zone--YOUR HANDYMAN ZONE!

Roofs and Components Category: Flat Roofs

Problem: 

Roof has a blister/big bump.

Tools / Materials (See Below for Applicability):

  • Caulking gun

  • Roofing cement (both in a can and a caulking tube)

  • Roofing membrane (asphalt-saturated fabric)

  • Carpenter's knife

  • Putty knife/joint knife

  • Roofing nails

  • Hammer

Solution:

 

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:

  1. Using a stiff bristle brush, brush clean the blister area of the roof.

  2. 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). 

  3. 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.

  4. 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. 

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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 possible.

  10. 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 membrane installation.

That's what it takes to fix a roof blister/big bump.

Ed the Handyman

            &

Your Handyman Zone Team

 

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