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Silicone or mastic - uPVC frames?

Discussion in 'Windows and Doors' started by garyo, 16 Sep 2012.

  1. garyo

    garyo

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    Should silicone always be used sealing the outer of uPVC frames to brickwork, or do people use mastic too?
     
  2. Consfactbob

    Consfactbob

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    Silicone every time, always use low modulus neutral curing silicone, mastic is a generic term used to describe (usually) cheap builders quality mastic with very little elasticity that will invariably crack in a short time and not bond with the UPC
     
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  4. gissle

    gissle

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    I agree with the previous poster. Definitely use a decent quality sealant for exterior jobs.
     
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  5. garyo

    garyo

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    Cheers chaps. So what does anyone use mastic for?
     
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  7. ^woody^

    ^woody^

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    When it needs to be painted.

    And if you don't mind redoing it in 10 years time when it cracks
     
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