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Ronald L. Geren, RA, CSI, CCS, CCCA
Senior Member
Username: specman

Post Number: 115
Registered: 03-2003
Posted on Monday, March 28, 2005 - 01:24 pm:   Edit PostDelete PostPrint Post

I have a project where the laminated glass has arrived on site, but the interlayer does not extend to the edges of the glass. I could probably live with it if the edges were consistent, but they're not. The reason why this is so bothersome is the fact that they're part of a butt-glazed assembly, so there's no framing to conceal the edges.

I don't have a copy of GANA's Laminated Glazing Manual to check and see what the standard should be. I've ordered a copy, but it won't help me now.

Has anybody else experienced this problem before? Any suggestions?

Curt Norton, CSI, CCS
Senior Member
Username: curtn

Post Number: 78
Registered: 06-2002
Posted on Monday, March 28, 2005 - 02:15 pm:   Edit PostDelete PostPrint Post


No experience, but check out ASTM C1172. Table 1 lists maximum allowable laminating process blemishes including "short interlayer." For "up to 25 sf" the exposed edge (EE) can have 1/16 inch unlaminated area. 25-75 sf can have 3/32 inch unlaminated edge.
John Bunzick, CCS, CCCA
Senior Member
Username: bunzick

Post Number: 343
Registered: 03-2002
Posted on Monday, March 28, 2005 - 02:21 pm:   Edit PostDelete PostPrint Post

Note that the silicone sealant of a butt glazed assembly may cause a blushing or fogging of the interlayer for a small distance back from the edge of the glass. This does not affect its performance, I'm told by a reliable rep, and generally isn't visible on structural-glazed systems due to the presence of the mullion behind. It may be visible on a plain butt-glazed installation, however. Perhaps this was done intentionally by the fabricator to try to avoid this effect.
Ronald L. Geren, RA, CSI, CCS, CCCA
Senior Member
Username: specman

Post Number: 116
Registered: 03-2003
Posted on Monday, March 28, 2005 - 02:27 pm:   Edit PostDelete PostPrint Post

Curt: Thanks! That's exactly what I was looking for. I specified C1172, but didn't bother to check the standard in detail.

John: This was discussed with the glazer, and I believe you're correct that that was the reason. The problem is the inconsistency, and the fact that the gaps in many areas exceed the maximum per the ASTM.

Thanks again.

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