Bay / Bow
Available in practically any size, a Supreme Bay or Bow window can be manufactured to fit any opening for renovation or new construction.
Bay or Bow windows are ideal in living, dining and family rooms or over your kitchen sink, and are available with a factory installed wood head & seat for an easy retrofit to an existing window opening.
By using various combinations of Casement or Awning openers with fixed picture windows, you can obtain as little or as much ventilation as you desire.
- Multi-chamber frame combines structural stability with high thermal
performance. Sealed air pockets reduce heat and cold transfer to
provide greater indoor comfort.
- Fusion-welded frame corners provide strength and durability - water
and air leakage is eliminated at the critical corner locations.
- Standard integral nailing flange provides for convenient and energy
efficient installation.
- Exclusive 3-point weatherstripping system ensures a firm seal against drafts and reduces heat loss.
- Premium quality dual-arm Truth hardware and multi-point lock ensures ease of operation and maximum security.
- Interior Jamb Extensions available in vinyl, paint-grade wood and stain-grade wood. For retrofit installations a 3 1/4" box frame is available.
- A Non-glare Fiberglass screen with concealed fasteners provides a neat, clean appearance and allows foe ease of removal from the interior of the home.
Glazing
- Dual-pane or Triple-pane increase comfort and protect against
convection heat loss. For maximum energy efficiency inquire about our
Solarguard high-performance Low-E glazing system.
- Dual-pane sealed units incorporating a full 1/2" of insulating air space
provides outstanding thermal performance and noticeable reduction of
exterior noise.

Bay 90 ° (Option A) Size calculator (2 1/8" Jamb c/w Nail Fin, 90° Wood return)
- New Opening: Center Window Width = R.O. - 2"
- Retrofit: Center Window Width = O.S.M. Nail Fin Width - 4 1/4"
- Window Height = R.O. - 1 1/4" (1/4" Clearance Plus 1" for Head and Seat
- Plywood Tongue Length = Wall Thickness + 1 1/4"
- Window (c/w nail Fin) Projection = Flanker size + 4 1/2"
Bay 90 ° (Option B) Size calculator (4 1/2" Jamb c/w Nail Fin)
- New Opening: Center Window Width = R.O. + 3 1/2"
- Window Height = R.O. - 1" (1/4" Clearance Plus 1" for Head and Seat
- Window (c/w nail Fin) Projection = Flanker size + 4 1/2"
Bow 15° Size calculator
| Box Width |
Window Heights |
R.O. Width |
Projection |
| 20" |
R.O. - 1" |
95 3/4" |
17 1/4" |
| 24" |
R.O. - 1" |
114 3/8" |
20 1/4" |
| 30" |
R.O. - 1" |
142 3/8" |
24 3/4" |
Common Configurations
1. 45° Bay
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| 3L (P-P-P) |
3L (L-P-P) |
3L (P-P-R) |
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| 3L (L-P-R) |
4L (P-P-P-P) |
5L (P-P-P-P-P) |
2. 90 ° Bay
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| 4L (P-P-P) |
4L (P-P-P-P) |
5L (P-P-P-P) |
Option A:
- Complete with Crezone Plywood Head & Seat
- Jamb 2 1/8" with Nail Fin and 90° Crezone Return

Option B
- Complete with Wood or Vinyl Jamb Extension
- Jamb 4 1/2" with Nail Fin.
- Not available with Head and Seat

2. 5L Bows