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  1. #1
    Join Date
    Jul 2008
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    46

    Default Silicone versus Glazing for sealing replacement glass

    All,

    Could someone tell me if silicone can be use in place of glazing for seal glass replacement.

    I've read mixed opinions some say yes others say no...Whose right?

  2. #2
    Join Date
    Jul 2010
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    SoCal
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    5,084

    Default Re: Silicone versus Glazing for sealing replacement glass

    It's your call.

    For older metal windows (not aluminium) or wood frame windows I like to use DAP glazing material. It's easy to bevel and to apply, cause it's not as messy as silicone. I use silicone for smaller, narrower applications, where less material is needed.

  3. #3
    Join Date
    Aug 2007
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    6,481

    Default Re: Silicone versus Glazing for sealing replacement glass

    Like DJ said, it's more about the application and your preference. In older metal frames and wood windows, glazing is the best because you set the window into the glazing and then apply a second bead over the top. It takes a bit to get the hang of it, but the great thing is if you mess it up, you simply scr-ape it out and reuse it. You can't do that with silicone, nor in this case is silicone going to be workable due to the quantity being used and tooled.

    On aluminum and vinyl windows bedding the glass into silicone (beutyl caulk is better ) is acceptable/preferable because there is an exterior rubber/metal trim the goes on to cover the perimeter of the glass. Run a bead of silicone around the frame, press the glass into the frame with an even reveal around its entire perimeter (use shims to hold the bottom space while the silicone dries ). Let the silicone fully cure before removing any of the oozed out material from the inside of the window. When it's cured, you simply run a utility knife along the frame and the excess silicone will peel right off. If you try to play with it while wet, you'll have a serious mess on your hands. Beutyl caulk is better because it's more stable than silicone. You'll apply and handle it similarly as silicone.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  4. #4
    Join Date
    Jun 2007
    Location
    Keyport, NJ
    Posts
    36

    Default Re: Silicone versus Glazing for sealing replacement glass

    Silicone can't be painted.

  5. #5
    Join Date
    Aug 2007
    Location
    Portland, Oregon, formerly of Chicago
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    1,584

    Default Re: Silicone versus Glazing for sealing replacement glass

    There is a reason glazing compound has been used for a hundred years largely unchanged. If it ain't broke, don't fix it!

    The other posters have stated good reasons: compound is easy to use, forgiving, can be painted, and does not leave a hard to clean up residue.

    Most later day alternate glazing systems don't use silicone, but a butyl rubber type compound. Silicone does have long lasting attributes, but the difficulty of application, and eventually its removal, overweight those attributes, especially for the average homeowner.

  6. #6
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Silicone versus Glazing for sealing replacement glass

    Quote Originally Posted by ordjen View Post
    Silicone does have long lasting attributes, but the difficulty of application, and eventually its removal, overweight those attributes, especially for the average homeowner.
    All reason that I despise silicone caulks and lobby for the use of alternatives that are either better products, easier to use, and most certainly easier to deal with when it fails.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  7. #7
    Join Date
    Jan 2010
    Location
    Northern Virginia
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    975

    Default Re: Silicone versus Glazing for sealing replacement glass

    If we are talking about single panes in old-style wood sash, then use glazing compound not caulk. If we are talking about insulated glass in newer doors and windows, then use a butyl caulk or a flexible polyurethane sealant such as Lexel.
    Casey
    Remove not the ancient landmark, which your fathers have set.

  8. #8
    Join Date
    Jul 2008
    Posts
    46

    Default Re: Silicone versus Glazing for sealing replacement glass

    Hi Sombreuil_mongrel

    why glazing for single panes in old-style wood sash and caulking for insulated glass.

    Thx

  9. #9
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Silicone versus Glazing for sealing replacement glass

    The newer glazing systems are done with sealants not old-time oil+chalk compound.
    Does the glass go in from inside (new systems) or outside? If from outside, use putty, otherwise use sealant.
    If there was a sealant, use a sealant. If it's 50+ year old wood sash where there was compound, use compound.
    General rule: put back what was there, it was there with good reason.
    Casey
    Remove not the ancient landmark, which your fathers have set.

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