Edges of Laminated Glass

Log Out | Topics | Search Moderators | Register | Edit Profile

Author Message 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:    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? Thanks! Curt Norton, CSI, CCS Senior Member Username: curtn Post Number: 78 Registered: 06-2002 Posted on Monday, March 28, 2005 - 02:15 pm:    Ron, 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:    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:    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.