roof caulk
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#4
I don't want to start a debate over caulking, but my position would be if it is well stuck down, leave it. The self-leveling will puddle right over it. Otherwise, I use a wide blade "Old Timer" knife I have been using for nearly 30 years. My dealers call it my "putty knife". Pretty sharp, but not like the one I use for fine cutting with a broad blade. Then I just take my time. It really depends on the shape of what is already there.
The worst removal jobs are the one where I have to install a second air conditioner on newer units where the caulking is still fresh and well stuck down. There is will take me longer to get the roof clean and the old vent up, then it does to install the AC. Hate those!
Steve
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#8
In my experience there are a number of factors that affect whether caulking holds. Usually Dicor over Dicor or something similar from the factory does pretty well and it is easy enough to tell. Try a little and see how it holds. Once it dries, try to pulling it free. Of course, over silicone or something similar forget it. I realize some folks feel strongly the only way to correctly caulk is to take the old up before putting down new, but I just haven't found that to be necessary in many cases.
Just my thoughts,
Steve
Just my thoughts,
Steve
#9
#10
In my experience there are a number of factors that affect whether caulking holds. Usually Dicor over Dicor or something similar from the factory does pretty well and it is easy enough to tell. Try a little and see how it holds. Once it dries, try to pulling it free. Of course, over silicone or something similar forget it. I realize some folks feel strongly the only way to correctly caulk is to take the old up before putting down new, but I just haven't found that to be necessary in many cases.
Just my thoughts,
Steve
Just my thoughts,
Steve
Have you used Eternabond before? It also looks like a good alternative.
Your thoughts?
#11
However, DON'T use Dicor on the skylights! They are made of polycarbonate (Lexan), and Dicor will cause them to crack.
There's a special sealant used for skylights only, called SureBond SB-140. Hard to find, but less trouble in the long run.
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There's a special sealant used for skylights only, called SureBond SB-140. Hard to find, but less trouble in the long run.
Pop
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Steve,
Have you used Eternabond before? It also looks like a good alternative.
Your thoughts?
Amazon.com: EternaBond RSW-4-50 White Roof Seal: Automotive
Have you used Eternabond before? It also looks like a good alternative.
Your thoughts?
Amazon.com: EternaBond RSW-4-50 White Roof Seal: Automotive
Steve
#14
However, DON'T use Dicor on the skylights! They are made of polycarbonate (Lexan), and Dicor will cause them to crack.
There's a special sealant used for skylights only, called SureBond SB-140. Hard to find, but less trouble in the long run.
Amazon.com: BriRus SB140 Skylight Sealant: Automotive
Pop
There's a special sealant used for skylights only, called SureBond SB-140. Hard to find, but less trouble in the long run.
Amazon.com: BriRus SB140 Skylight Sealant: Automotive
Pop
Steve
#15
I ordered a skylight and I didn't expect to have the caulking come with it, so didn't go through the packing material very well. After ordering and waiting for the SB-140 to arrive separately, and after the install was complete and curing, I was throwing away the box, and I found the tube.
Now I have a spare that I keep in the refrigerator.
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Now I have a spare that I keep in the refrigerator.
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