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Does the sill (bottom) side of vinyl window in stucco wall need casing bead?

Does the sill (bottom) side of vinyl window in stucco wall need casing bead?

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Old 09-20-18, 02:47 PM
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Does the sill (bottom) side of vinyl window in stucco wall need casing bead?

I know that a casing bead is supposed to be installed 3/8in from the window edges when installing windows in a stucco wall due to stucco expanding in hot weather. I can see why this is necessary for the top and sides of the window, but does the bottom side of window need to have a gap too? Will stucco expanding upwards, against gravity?
 
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Old 09-20-18, 04:31 PM
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Things expand in all directions due to heat. So the answer is yes. And its the window that is more likely to expand and contract. That's why it's the window mfg who says how much the gap around their window should be.
 
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