| Author |
Message |
Marc C Chavez
Senior Member
Username: mchavez
Post Number: 406
Registered: 07-2002
| | Posted on Wednesday, March 30, 2011 - 12:46 pm: |    |
how do you all specify the primary seal (between spacer and glass) to get a nice straight line - it seems to depend upon the job - some are terrible! the glazing standards talk about the seal staying sealed - not the look. |
Dennis C. Elrod, AIA
Senior Member
Username: delrodtn
Post Number: 26
Registered: 04-2010
| | Posted on Wednesday, March 30, 2011 - 02:27 pm: | |
Here is all we have in our Office Master...
2.1.D. Glazing Gaskets: Neoprene, EPDM, silicone, or Santoprene rubber.
3.1 INSTALLATION
A. Comply with requirements of Section 01 70 00.
B. Do not install damaged or substandard components, including items that have deficient or damaged finishes.
1. Corrections in field are subject to Architect's approval before installation.
2. Return components to factory for remanufacturing or refinishing, or provide new components to replace items that cannot be satisfactorily corrected in field.
C. Set components plumb, level, and true to line, and without warp, rack, or other distortion. Install components accurately aligned and accurately located in reference to column lines and floor levels.
D. Fit joints to produce hairline joints free of burrs and distortion.
E. Rigidly secure nonmovement joints.
F. Anchor components securely to building structure. Provide alignment attachments and shims to permanently fasten system to building structure.
1. Provide separators and isolators to prevent metal corrosion and electrolytic deterioration, and to prevent impeding movement of moving joints.
G. Separate aluminum and other corrodible metal surfaces from sources of corrosion or electrolytic action at points of contact with other materials per manufacturer recommendations.
H. Form end dams with assembly sealant where needed to control water movement within system
I. Set continuous sill members and flashing in full sealant bed per requirements of Section 07920 to provide weathertight construction, unless otherwise indicated.
J. Coordinate attachment and sealing of perimeter air barrier and vapor retarder materials.
K. Pack fibrous insulation into perimeter shim spaces and other concealed voids to maintain continuity of thermal barrier.
Dennis C. Elrod, AIA |
(Unregistered Guest)
Unregistered guest
| | Posted on Thursday, March 31, 2011 - 09:14 am: | |
Mockup? |
John Bunzick, CCS, CCCA, LEED AP
Senior Member
Username: bunzick
Post Number: 1314
Registered: 03-2002
| | Posted on Friday, April 08, 2011 - 02:07 pm: | |
Marc,
I can think of very few situations where this is even visible: from the outside of a structurally-glazed system at ground level, for example. In that instance the structural glazing is more visible than the primary seal of the glass. Most large glass fabricators, and even many smaller ones, apply the primary seal via a metered dispensing system, so it is usually pretty good.
Can you elaborate a bit to satisfy my piqued curiosity? Outside of a specifying a pre-approved proprietary fabricator, or perhaps several sample panels, I don't think you'll control this with 'words.' |
Marc C Chavez
Senior Member
Username: mchavez
Post Number: 409
Registered: 07-2002
| | Posted on Saturday, April 09, 2011 - 07:35 pm: | |
yes we had mockups
and we did reject a few panels and they were redone
and yes they do use a dispensing system and that's the problem, keeping it regular and straight. it just feels like sloppy work and since there is no standard for this (that I can find) after the worst examples were fixed the contractor said that's it the rest "meet our standards" we wanted to reject all of them and there was just too much of a fight.
the glass it so clear that it is easily seen |
Gerard Sanchis
Senior Member
Username: gerard_sanchis
Post Number: 18
Registered: 10-2009
| | Posted on Monday, April 18, 2011 - 01:19 am: | |
A word of caution: We do not specify EPDM when it can be exposed to UV; neoprene, santoprene and silicone are not affected so they should be specified for the outboard gaskets.
Another word of caution, when setting sill members and flashing in full sealant bed, be careful that the weep holes are not blocked.
I, like John, cannot visualize the primary seal being visible, but if you say it is, then only a mockup would establish an acceptable visual standard |
Russ Hinkle, AIA, CDT, LEED AP
Senior Member
Username: rhinkle
Post Number: 90
Registered: 02-2006
| | Posted on Monday, April 18, 2011 - 02:08 pm: | |
A few years back, the outside independant glazing consultant brought this visual issue to our attention and recommended that the glass have a 1/4 to 1/2 inch band of frit applied around the perimeter of the glass to hide the uneven look. It was however, not a cost the owner wanted to include. Have not seen the completed project yet, so I don't know how it turned out.
Russ Hinkle |
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