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caulk

 

Hi All,?

I know this has been discussed ad nauseum before, but I cannot seem to come up with the posts. I seem to remember a lot of controversy about what is the best type of caulk to use. Silicone or some thing else??

I'm semi retired now, I have time to work on this thing!

Thanks,?

Kathy
 

There is no best, just tradeoffs.?

If you're doing just the glue fillets around the fixtures or the metal roof trim, you can use a bunch of different things without much downside, as long as it's a quality product? Silicones will last longer, but are harder to remove.? But since the area is small, maintenance won't be that much work regardless.? If you use a silicone I'd recommend the SCS1200 that I posted about, since new scs1200 sticks to dried scs1200, and thats not true for other silicones.? A polyurethane caulk like sikaflex 505 UV has also been used by some, and that will be easier to remove than silicone.

If you're rebedding a skylight, then you have a big decision to make.? You can use a weaker bonding caulk like scs1200, but if you do you should bolt down the corners.? Most people don't like drilling holes in their roofs so it's not a slam dunk first choice.? You could also use a very high bond strength caulk like Plexus ma 300, and no bolts are needed.? But if you do that removing the skylight later will be very difficult, and you risk damaging your roof when you do it.? Skylights only last about 10 years before they get cloudy or crack, so you have to plan on replacement eventually.?
 

Thanks Steve. I knew someone had a rational for what they used.?


On Sat, Jul 9, 2022, 10:02 PM Steve T <srtimm@...> wrote:
There is no best, just tradeoffs.?

If you're doing just the glue fillets around the fixtures or the metal roof trim, you can use a bunch of different things without much downside, as long as it's a quality product? Silicones will last longer, but are harder to remove.? But since the area is small, maintenance won't be that much work regardless.? If you use a silicone I'd recommend the SCS1200 that I posted about, since new scs1200 sticks to dried scs1200, and thats not true for other silicones.? A polyurethane caulk like sikaflex 505 UV has also been used by some, and that will be easier to remove than silicone.

If you're rebedding a skylight, then you have a big decision to make.? You can use a weaker bonding caulk like scs1200, but if you do you should bolt down the corners.? Most people don't like drilling holes in their roofs so it's not a slam dunk first choice.? You could also use a very high bond strength caulk like Plexus ma 300, and no bolts are needed.? But if you do that removing the skylight later will be very difficult, and you risk damaging your roof when you do it.? Skylights only last about 10 years before they get cloudy or crack, so you have to plan on replacement eventually.?

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