Standard and Non-Standard Sash Sizes
STANDARD STORM SASH SIZES:
Please note: Storm sash can be made to almost any size, however, in order to qualify for standard-sized sash pricing the sash must meet the following criteria:
Standard size storm sash are made to fit standard window sizes, which are based on standard glass sizes. For single-light double-hung windows made to eastern standards, the glass sizes are even-inch widths x even-inch heights. The storm sash made for these windows have the same glass sizes as the double-hung sash. The overall storm sash size for these windows is 4" wider and 6" to 8" higher than twice the glass height, depending on the design of the window sill. (The sill factors are whether the sill is a single piece or has a sub-sill, and the slope of the sill, which varies by window manufacturer.) Therefore, the overall storm sash size is even-inch width by even or every other odd inch height, provided that the glass height is even inches.
Examples: Standard sash widths: 24" (20" glass), 26" (22" glass), 28" (24" glass), 30" (26"glass), 32" (28" glass), etc.
Standard storm sash heights: 38" (16" glass with 3" bottom rail)
39" (16" glass with 4" bottom rail)
40" (16" glass with 5" bottom rail)
42" (18" glass with 3" bottom rail)
43" (18" glass with 4" bottom rail)
44" (18" glass with 5" bottom rail)
46" (20" glass with 3" bottom rail)
47" (20" glass with 4" bottom rail)
48" (20" glass with 5" bottom rail)
Etc. please note that 37", 41", 45", 49", etc. are not standard storm sash heights (since you cannot deduct 6" to 8" from the sash height, divide by 2, and arrive at an even-inch glass height.)
EASTERN STANDARD RAIL AND STILE FINISH SIZES and FACE MEASURES:
Standard top rails and stiles are 2-5/32" wide (1-31/32" FM), center rails are 1-1/4" wide (7/8" FM), and bottom rails are 3-5/32" to 5-5/32" wide (2-31/32" to 4-31/32" FM)
EASTERN STANDARD GLASS OPENING SIZES, DAYLIGHT OPENING SIZES, and GLASS RABBET WIDTHS:
Glass opening sizes, also referred to as "to rabbet size",(both widths and heights) are even inches plus 1/16", to accommodate standard even-inch glass sizes. Daylight openings are 5/16" less in both width and height than their corresponding glass size. Glass rabbets and sticking profiles are 3/16" wide.
MODIFIED SASH WIDTHS:
For a small additional charge, standard sash widths can be widened or narrowed up to 1/2" by making the stiles up to 1/4" wider or narrower than standard stile widths. NOTE: Modified sash have standard glass sizes. For example, a 32" wide sash (with 28" wide glass) can be made from 31-3/4" wide to 32-1/4" wide.
MODIFIED SASH HEIGHTS:
Standard storm sash with even-inch glass heights can be made with anywhere from 3" to 5" wide (nominal size) bottom rail. The sash heights (see examples above) can be anywhere from 38" to 40", 42" to 44", 46" to 48", 50" to 52", etc. Other sash heights are considered non-standard.
ODD (NON-STANDARD) STORM SASH SIZES:
Sash sizes that do not meet the above listed criteria are considered to be Odd (Non-Standard) Sizes. We can make any sash size that you want, however, for non-standard sash sizes YOU MUST PROVIDE GLASS SIZES OR DAYLIGHT OPENING SIZES (specify which) in addition to the sash sizes in order to get a correct quote and a properly made sash. Non-standard sash can have any glass size and any stile or rail widths wanted, however, stiles and top rails should be approximately the same size as standard sash (2-5/32" wide) and bottom rails should be approximately 3" to 5" wide in order to have a well-proportioned and structurally sound sash. We do NOT like to make sash with a bottom rail that is less than 2-1/2" wide for these reasons.
If you want odd-sized sash and do not want to provide glass or daylight opening sizes, the non-standard sash can be made with standard stile and rail widths to simplify sash design, however, glass sizes will usually end up as fractional inches and the center rail may not align correctly with the meeting rail of the primary window unless it's position is explicitly stated, preferably with a sketch. In this case it may also be necessary to provide the width of bottom rail wanted, and unless you design this carefully, you may end up with the upper and lower glass being unequal in height.