EFCO Special Purpose Windows General Maintenance Instructions - Manual (Page 7)

General Service and Maintenance Manual
SECTION 2
GLASS CARE MAINTENANCE AND CLEANING
2.d. DEGLAZING AND REGLAZING FOR TAPE GLAZING APPLICATIONS
Deglazing of Broken or Defective Glass
1. Remove glazing beads by applying pressure to the inside lower edge of the bead to compress
the glazing vinyl. While maintaining inward pressure give a slight upward movement. If the
bead is tight it maybe necessary to insert a putty knife in the crevice between the bead and
the sash of the frame then give a slight twisting motion as pressure is applied to the bead.
2. Remove broken or defective glass—in some cases it may be necessary to cut the old sealant
loose from the glass by running a utility knife between the glass and the glazing leg.
3. Remove all existing sealants and dirt from the glazing surface of the sash or frame. This is
usually done by scraping with a putty knife or similar object.
4. Wipe down the sash or frame glazing surface with a solvent saturated oil-free cloth. Suitable
solvents include xylol, toluol or methyl ethyl ketone. Always follow the manufactures’
instructions for handling of solvents.
Glazing/Reglazing the Window
1. Glazing surfaces should be prepared in accordance with the tape manufactures’ instructions
to assure good adhesion. Surrounding temperatures must be within the tape manufactures’
specified range during application. Special attention must be given to condensed moisture or
frost on cold metal surfaces with can occur if glazing when temperature in below 40̊ F.
2. Apply a pre-formed sealing tape (tremco 440 or equal) so that that edge is approximately
1/32” below the sight line of the glazing leg. If the sash but joint is in a vertical direction, the
glazer shall run the tape initially on the head and sill member going directly over this joint.
Should butt joints in the sash run horizontally, tape must first be applied to the jambs so that it
crosses over the joint. Do not stretch or lap the adjoining lengths of tape. This would prevent
full contact around the entire perimeter of the glass or panel. Remove backing paper from
tape just prior to setting glass.
3. Install setting blocks and edge blocks—glass should always be set on two identical rubber
setting blocks of an acceptable rubber material having a shore a durometer hardness of
85+/-5. The setting blocks should be the proper size and design to assure full bearing surface
of both lites of glass in an insulated unit.
4. After inserting the glass, reinstall horizontal glazing beads and then the vertical beads by
applying an inward pressure on the inside bottom of the bead with a slight downward
pressure. Some types of glazing may require a slight tap from a rubber hammer/mallet to get
the bead started.
5. Cap bead glass with silicone sealant at inside glazed applications.
6. Allow cap bead sealant to cure a minimum of 24 hours before operating the window, see
sealant manufacturers’ instructions for actual cure time.
NOTE: EFCO Corporation assumes no responsibility for failure of insulated glass
units due to faulty installation.
EFCO CORPORATION 2013 PAGE 6