Viridian Window Restoration/Bi-Glass Systems
CONVERTED WOOD WINDOWS USING THE BI-GLASS SYSTEM ®
Bi-Glass operation manual.
Installer shall be a licensed installer of Bi-Glass and knowledgeable of all current methods and trade secrets offered under this license.
A. One sample of converted sash and balance method selected for the job.
B. When new wood sash is needed, shop drawings will be submitted.
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.
Convert windows in strict accordance with safety and weather conditions required by the material used in the Bi-Glass operation manual.
Conversion method and materials shall be in strict accordance with the Bi-glass manual.
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.
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" OA thickness).
3. Glass units to have factory replacement warranty covering unit "free from moisture between the two glass surfaces" for a period of twenty (20) years.
4. Glass type, (clear, low-E, tinted, gas filled, tempered) to be determined at time of sample.
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" + or - 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 weights and cords
b. hidden balances
c. Type determined before sample installed. Bi-Glass to determine best option to use considering weight, use, and requirements of end user.
2. Existing weights to be balanced to new heavier glass. Weight pockets sealed to control air infiltration. Replace cords (chains) as required. Install weather-stripping on sides of sash in strict accordance to Bi-Glass specifications using either or both vinyl corner seal and ribbed felt spline.
3. Single balance tilt track to be used when tilt in feature is required and sash weight can be balanced by a single spring.
4. Double balance tilt track to be used when tilt in feature is required and sash weight can not be balanced by a single spring. Track size and balance spring size to be in strict accordance with Bi-Glass specifications.
E. Balance Component Specifications
1. Existing weights Ropes are replaced with nylon, 3/8" 1500 lb. test cord. Sash chain replaced with plated steel, 250 lb. test. Weights are added with 2 lb. stackable cast iron 4" sections or pre-sized lead weights. Sash pulleys are replaced where needed with red bronze housing and wheel, with a steel axle, and matched to size and weight used.
2. Single balance tilt track: (7000 Series) Full-tilt rigid vinyl jamb liners with cellular foam backing. PVC material is extruded .050 thickness. Block and tackle balances are made with lubricated high initial-tensions springs, zinc die cast pulleys, pre-stitched Dacron cord and "knife lock" locking terminal. Cam pivot attached to "V" profiled sash is cast zinc. Installed onto jamb board with center, coarse-threaded, galvanized, ‘2" screws.
3. Double balance tilt track: (Magnum Series) Full-tilt rigid vinyl jamb liners with cellular foam backing. PVC material is extruded .065 thickness. Block and tackle balances are made with lubricated high initial-tension springs, zinc die cast pulleys, pre-stitched Dacron cord and "knife lock" locking terminal. Two balance are used per side of sash engineered to match sash weight. Cam pivot attached to "V" profiled sash is cast zinc. Installed onto jamb board with galvanized steel brackets.
4. 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.
5. Tape Balances: Pullman tape balances with spring steel tape are used in place of rope and pulley to enable weight pockets to be filled with insulation. Balance spring is engineered to the weight of sash. Tape is attached to stile similar to the old rope.
1. All weather-stripping to be installed into a saw kerf.
2. Horizontal weather-stripping shall be ¼" tubular silicone rubber with a saw kerf bar.
3. Vertical weather-stripping shall be a brush with vinyl center fin, ¼" pile, held in a polypropylene saw kerf bard.
4. Check rail shall be bulb covered with low friction plastic coating.
5. End of check rail shall come in contact with brush plug in jamb liner or parting stop.
6. All weather-stripping shall be applied in accordance with Bi-Glass specifications.
G. EXTERIOR MATCHING HISTORIC GRILLS
Grills 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.
Existing hardware shall be installed when possible. The cost of new hardware or replacement hardware is the responsibility of the client but will be installed as needed by Viridian Window Restoration.
I. WOOD REPAIR
1. All filler shall be exterior rated. Latex flexible (can be painted) filler shall be used. Filler will be used on surface not structural parts of window.
2. Structural repairs will be with System 3 Sculpwood & RotFix or new component parts, with prior approval.
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.
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 replacement in opening. Sash is removed and numbered. Parting bead is removed. Top sash is removed and numbered. If weights are not used they are removed from the jamb weight door. Pulleys are removed. Weight pockets are filled with fiberglass insulation. Weight door is replaced, pulley hole filled, and cracks or saw cuts filled. Fill sill as required by standards set at time of sample
D. Install sash in Router Guide Tool. Cut out existing glass. Cut and clean rabbet joint to glass size.
E. Glaze in 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. Resize as needed to fit meeting rail flush.
L. Inside stop shall be screwed or nailed back into place.
All new wood shall be primed. Excess sealant shall be removed.
All excess sealant shall be removed.
All debris shall be removed from work site.