Part 1 - General


1.01 - Scope

Provide all materials, labor, equipment, glass and implements required to furnish and fabricate Add On Glass retrofit insulating glass units to the existing monolithic glazing or to form a triple insulated unit by bonding to an existing double pane insulated unit. Installation will be complete: with insulated spacers, premium grade polyisobutylene, silicone, desiccant and trim. Unit will be fabricated on-site and hermetically sealed using the existing glazing and framing.

1.02 - Install

Components fabricated at the plant will be assembled at the job site, attached to the existing glass and frame and installed by Add On Glass certified installers.

1.03 - Storage

Store materials delivered at job site in a clean, safe, secure, unoccupied location, as directed by the owner or the owner's agent. Materials will remain sealed unless unpacking is required by the Architect for inspection. Unpack materials as they are ready to be assembled and installed.


Part 2 - Materials


2.01 - Glass

Glass shall be LOF clear float glass or approved equal. Thickness will be either DS 3/16" or 1/4" as determined by the size of the window opening. When local building code required tempered or laminated safety glass be installed in certain locations, then the architect or owner shall so notify Add On Glass. Optional glass: specialty, obscure, coated or tinted.

2.02 - Sealant-ISO

Premium grade sealant, polyisobutylene is applied to each edge of the insulated spacer making contact with the glazing. These 2 coating of poluisobutylene form a thermal break between the insulated spacer and glazing.

2.03 - Spacers

Rectangular shaped, 0.019 extruded anodized aluminum spacers, size to be 0.500 x 0.325 with nylon corner keys. Under certain conditions and when specified by the architect, other spacers are available in 0.250, 0.375 and 0.750 sizes.

2.04 - Corner Keys

Keys will be of virgin HDPE and coated with polyisobutylene during assembly to further ensure the integrity of the hermetic seal.

2.05 - Absorbent

To be Union Carbide's MolSiv moisture absorbing desiccant or approved equal.

2.06 - Blocks

Neoprene setting blocks of the correct tickness and width be used to support the new glazing and will have an 80 to 90 Shore A durommeter rating.

2.07 - Wire

Coated wire is placed on the surface of the polyisobutylene to conduct heat into the insulated spacer in order to heat the two surface coatings of polyisobutylene and create an air-tight seal between the glazing.

2.08 - Sealant-Silicone

GE 1000 silicone construction sealant seals the perimeter (gap between the window frame and the separating spacer) of the newly formed insulated unit, bonding it to the frame for superior strenght. This seal is seal #3 and acts as an additional thermal break.

2.09 - Trim

Finish trim will be fabricated from 0.027 natural aluminum. The trim width will be sufficient to cover the edge of the insulating spacer and remove the spcer from the line of sight. The trim will cover the perimeter opening bach to the frame. Trim color other than natural aluminum is to be specified by architect, owner or owner's agent when placing the order. Add On Glass will match trim to frame color as close as possible. We will not guarantee an exact color match due to conditions.


Part 3 - Installation


3.01 - Field Measure

All openings to be retrofitted will be site measured for fabrication by qualified Add On Glass staff. No size will be taken verbally or from drawings, sketches or blue prints.

3.02 - Cleaning

The inner surface of the existing glass will be thoroughly cleaned as will both surfaces of each pane of new glass. Any imperfections, scratches or bubbles in the existing glass will have to remain since that pane is not being changed. Specially made, non-streaking cleaning solution and lint-free cloths or towels will be used for cleaning.

3.03 - Spacers

The spacers and corners keys are assembled and spacers filled with desiccant. The spacer is added to the perimeter of the existing glass. Heat wires are placed on the exposed surface of the polyisobutylene to heat the spacer and bring the temperature of the polyisobutylene to a point it bonds to each surface of the glass.

3.04 - Add On Glass

The new glass is positioned on the neoprene setting blocks and then pressed into the polyisobutylene to hold it in place. The new pane is positioned on the insulated spacer with equal spacing around the perimeter for silicone injection access.

3.05 - Wires

The coated wire ends will be attached to an insulated transformer, spacially built for this purpose. Voltage and amperage are applied at recommended levels as determined by window size and for a specified time period of between 8 to 15 minutes, until the polyisobutylene has heated to the required consistency.

3.06 - Pressure

A constant pressure is applied to the surface of the new Add On Glass pane, at the exact moment the polyisobutylene reaches correct consistency to create an air-tight bond on all surfaces.

3.07 - Silicone

The perimeter opening around the newly installed glass is completely filled with silicone. This filling is the 3rd and final seal and bonds the outer glass, bottom of the insulated spacer, edge of the new glass and the frame together as a single unit as well as acting as another thermal unit.

3.08 - Trim

Finish trim is placed around the perimeter of the new glass and bonded with silicone. The trim is to cover the edge of the insulating spacer, the edge of new pane and the opening filled with silicone between the spacer and the frame. The allowance for the trim to pass the edge of the spacer is 1/8".

3.09 - Final inspection

Installers to remove and clean any excess silicone. Clean outer surface of the newly installed glass and trim.

3.10 - Removal

Installers will remove all tools, excess materials and rubbish from the job site at the end of each work day (unless provisions are made to leave tools and materials overnight). At job completion the work site will be cleaned and cleared of all Add On Glass materials, exclusive of other trades still working.