Viridian Window Restoration/Bi-Glass Systems
Architectural Specifications
REFERENCES
QUALITY ASSURANCE
SUBMITALS
PRODUCT DELIVERY AND STORAGE
JOB CONDITIONS
INSPECTION
INSTALLATION
EXTERIOR FINISH
INTERNAL FINISH
REMOVAL
CONVERTED WOOD WINDOWS USING THE BI-GLASS SYSTEM ®
I. GENERAL
REFERENCES
Bi-Glass operation manual.
QUALITY ASSURANCE
Installer shall be a licensed installer of Bi-Glass and knowledgeable of all current methods and trade secrets offered under this license.
SUBMITALS
A. One sample of converted sash and balance method selected for the job (large commercial jobs only).
B. When new wood sash is needed, shop drawings will be submitted (large commercial jobs only).
C. Upon completion of work required by this section, submit list of components used by type and size. Include instructions for periodic inspections, care and maintenance.
PRODUCT DELIVERY AND STORAGE
All materials to be delivered to job site by licensee or suppliers in good condition.
JOB CONDITIONS
Convert windows in strict accordance with safety and weather conditions required by the material used in the Bi-Glass operation manual.
II. PRODUCTS
GENERAL
Conversion method and materials shall be in strict accordance with the Bi-glass manual.
MATERIALS
A. EXISTING SASH
Using existing wood sash that meet the agreed upon standard set with sample window, joints strong and complete, surface repairable and can be filled with exterior filler and sized for conversion methods to be used. Sash determined unusable at time of initial inspection or upon discovery during performance of work will be replaced by either; 1) An historic, reclaimed sash of same size and specifications; or, 2) An approved new milled sash at a predetermined price.
B. GLASS
1. Insulated units factory fabricated of double-strength or tempered glass, as determined by building code. Overall thickness determined at time of sample usually 1/2.”
2. Dual sealed edges using dark bronze spacer.
3. Glass units to have factory replacement warranty covering unit "free from moisture between the two glass surfaces" for a period of ten (10) years.
4. Glass type, (clear, low-E, tinted, gas filled, tempered, obscure) to be determined at time of sample.
C. GLAZING
1. Existing sash to be modified by cutting away existing putty or stop, increasing the width and depth of the rabbet joint, and cleaning surface back to raw wood in strict accordance with Bi-Glass specifications.
2. Gaska V2500 series heavy density closed-cell PVC foam or similar gasket to be used to bed glass to sash.
3. Air space of 1/8" (+/- 1/16") maintained around glass in strict accordance with Bi-Glass specifications.
4. Exterior glazing stop to be of milled wood or equivalent, sealed and mechanically fastened to the existing sash. Wood stops to be primed white ready to paint.
5. Compatible glazing sealant to be used to seal exterior stop against moisture infiltration. Sealant to meet ANSI/ASTM C-834-76
D. WINDOW BALANCES
1. Type of balance system to be one of the following:
a. Existing sash weight and cord system. New sash cords and additional weight added to balance sashes with new, heavier insulated glass units.
b. Hidden balances (also referred to as channel balances).
c. Alternate balance type to be determined before sample is installed. Viridian Window Restoration will determine best option to use considering weight, use, and requirements of end user.
2. Existing weights to be balanced to new heavier glass. Replace cords (chains) as required. Install weather-stripping on sides of jamb in strict accordance to Bi-Glass specifications using either or both vinyl corner seal and brush.
E. BALANCE COMPONENT SPECIFICATIONS
1. Existing sash cords are replaced with CWC Premium Sash Cord of appropriate size to balance sashes. Weight is added with pre-sized lead weights. Sash pulleys are replaced where needed.
2. Hidden balances: Non-tilt balances fit into a ploughed stile of sash and screwed with top and bottom coarse-threaded hardened screw. Block and tackle balances are made with galvanized casing, one or two high initial tension springs, zinc die cast pulleys, and stainless steel end mounting clip is screwed to jamb board with hardened, coarse threaded screw. Balance spring engineered to weight of the sash.
F. WEATHER-STRIPPING
1. Silicone bulb weather-stripping to be installed into a kerf (1/8” x 1/4”).
2. Horizontal weather-stripping shall be 3/16" or larger tubular silicone rubber with a kerf bar.
3. Vertical weather-stripping on back of window stop and on ends of meeting rails shall be a .2” polypropylene brush with a .27”polypropylene backing with pressure-sensitive adhesive.
4. Vertical weather-stripping on blind stop and parting bead shall be 7/8” (7/16” folded) v-seal.
G. EXTERIOR MATCHING HISTORIC GRILLS
Grills shall be applied to the glass when a full sheet of insulated glass can be used. The grill is made from wood and primed. The grill is cut and fitted to match inside muntin configurations, and permanently attached to the glass using exterior glazing tape according to the Bi-Glass specifications.
H. HARDWARE
Existing hardware shall be re-installed when possible. The cost of new hardware or replacement hardware is the responsibility of the client and will added on a time and materials basis if installed by Viridian Window Restoration.
I. WOOD REPAIR
1. All filler shall be exterior rated. Latex flexible (can be painted) filler shall be used in non-structural settings.
2. Structural repairs will be made with System 3 Sculpwood & RotFix or new component parts, with prior approval.
III. EXECUTION
INSPECTION
A. Before installation begins, openings shall be inspected and surfaces shall be dry
B. Identify frame members that need replacement, filling, or caulking before work begins.
C. All unforeseen repairs to existing window members shall be identified and all additional costs approved prior to the commencement of repairs.
INSTALLATION
A. Installer shall conform to Bi-Glass recommended instructions.
B. Installer shall conform to safety regulations as required by federal, state and local laws.
C. Inside stops are removed and numbered for re-installation in opening. Sash is removed and numbered. Parting bead is removed. Top sash is removed and numbered.
D. Install sash in Router Guide Tool. Cut out existing glass. Cut and clean rabbet joint to glass size.
E. Glaze new insulated glass with approved back bedding sealant or glazing tape. Seal and fit exterior stops in accordance with the Bi-Glass operation manual. All exterior fasteners are exterior coated.
F. Cut and profile for balance system used in accordance with the Bi-Glass operation manual.
G. Install balance method into sash or opening in accordance with the Bi-Glass operation manual
H. Cut saw kerfs and install weather-stripping as done on the approved sample.
I. Install sash back into opening.
J. Install any replacement sash predetermined as needed.
K. Inside stop shall be screwed or nailed back into place.
EXTERIOR FINISH
All new wood shall be primed. Excess sealant shall be removed.
INTERNAL FINISH
All excess sealant shall be removed.
REMOVAL
All debris shall be removed from work site.