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Old 11-22-2009, 01:10 PM   #1
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Silicone Caulk


I am installing some vinyl windows and am looking for a very good silicone to use? I'm assuming I should use 100% silicone. Is GE Silicone II ok to use? any other suggestions?

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Old 11-22-2009, 03:04 PM   #2
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Silicone Caulk


It is okay but you might be better using an acrylic silicone caulk to keep the joint flexible and paintable.

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Old 11-22-2009, 04:52 PM   #3
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Silicone Caulk


Were are you caulking? Interior or exterior, and does it need to be paintable?
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Old 11-22-2009, 09:31 PM   #4
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Silicone Caulk


This is for exterior caulking and it does not need to be paintable. An engineer friend of mine said to use 100% silicone. Isn't it pretty flexible?
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Old 11-23-2009, 04:12 AM   #5
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Silicone Caulk


100% silicone sealant's much better'n anything else,,, HOWEVER, for best results, it should NOT be applied as caulk w/full adhesion,,, we run a strip of 1/4" tape down the jnt 1st so the sealant adheres to both sides of whatever void's being sealed,,, when any expansion/contraction occurs, the sealant's free to stretch/compress,,, lasts much longer that way,,, btw, you MUST 'tool' the sealant to force adhesion to the properly prepp'd surfac's AND shape-factor's VERY important,,, ck out the website for your supplier to be sure.

this is the same method we use when sealing jnts in conc - slabs/decks/highways,,, its VERY flexible - your engineer's 100% correct.
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Old 11-23-2009, 05:53 AM   #6
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Silicone Caulk


Quote:
Originally Posted by dorlando View Post
This is for exterior caulking and it does not need to be paintable. An engineer friend of mine said to use 100% silicone. Isn't it pretty flexible?
Personally I prefer polyurethane, or synthetic rubber (such as OSI Quad) caulking for exterior use. Although they are a little more difficult to work with and they do have a stronger oder, but they are very elastic and adhere better to porous materials and are available in a wider range of colors.
Repairs or re-caulking with silicone is problematic because new silicone does not stick to old silicone.
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Old 11-23-2009, 06:00 AM   #7
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Silicone Caulk


agree but if you/anyone does a 1/2-ass'd job on prep, no mtl's any good ! ! we've pump'd barrels of the stuff & NEVER had a problem so let's not blame silicone.
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Old 11-23-2009, 06:56 AM   #8
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Silicone Caulk


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Originally Posted by itsreallyconc View Post
agree but if you/anyone does a 1/2-ass'd job on prep, no mtl's any good ! ! we've pump'd barrels of the stuff & NEVER had a problem so let's not blame silicone.
Not my intention to blame silicone for anything, just a personal preference and past experiences that have made me come to this conclusion.
I should also say that most of my exterior caulking involves either cedar siding or half log siding, so this factors into my choices as well. So the wood and the need for frequent maintenance coats of stain or paint make silicone a poor choice for my particular applications.

itsreallyconc, I couldn't agree more that no material will make up for poor installation.

And the great caulk debate continues, There are so many good quality products on the market now it can be a difficult decision to make.
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Old 11-23-2009, 07:08 AM   #9
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Silicone Caulk


As above. The three causes of caulk failures:
Poor prep work (cleaning, priming)
Poor joint design
Wrong product selection.

Most quality caulks made today will last a good long time if they are applied properly.

Good info on caulk types here:
http://www.wbdg.org/design/079200.php

Good info on joint design here:
http://www.masterwall.com/files/mw14...lantdesign.pdf
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Old 11-23-2009, 08:22 AM   #10
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Silicone Caulk


ok, thanks for the great info. So, if I'm installing windows that are attaching to the buck strip will I need to tool the silicone after I put a bead on the buck strip? also, if there is some paint on the buck strips do i need to take that off or prime it?

Thanks
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Old 11-23-2009, 09:34 AM   #11
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Silicone Caulk


impo, no silicone sealant's worth a **** when applied to wood NOR does any silicone sealant mfg recommend it for that purpose - sorry - no idea what a buck strip is,,, would it occur during deer season by any chance when the does're watching & looking to mate ? ? ?
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Old 11-23-2009, 03:11 PM   #12
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Silicone Caulk


ok. My engineer friend also mentioned Sonolastic 150, I guess it is a hybrid and he says it works very well. also called a pro shop who sells it and they say it is widely used. Apparently works on several substrates including wood.
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Old 11-23-2009, 08:06 PM   #13
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Silicone Caulk


I used Sika for all my windows which seems to work well.

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