k o l b e
Ultra Pocket Double Hung Measuring Guide
Determining if the Ultra Pocket Double Hung is Right for You:
Check the existing frame for any signs of damaged or rotted wood. Repair or replace any
damaged or rotted wood on the frame. Next, measure horizontally between the blindstop and
the interior stop
to determine the jamb depth. If the damage cannot be repaired or
the jamb depth is less than 3-1/4", the Ultra pocket double hung will not work for you.
A new unit with full frame replacement will have to be used instead.
Figure 2 - Interior View
Measure existing frame diagonally to check squareness.
Figure 3 - Interior View
Measure existing frame horizontally to determine width.
1. Check the opening for squareness. Measure
diagonally from corner to corner, repeat for
should be within 1/4" of each other. If the
measurements are not similar, you will have
to downsize the new unit accordingly in order
to square the new unit in the existing frame.
2. Raise or remove the sash to take the
measurements. You may also need to remove
the jambliners if the side jambs are not visible
3. To determine the width of the new window,
measure from side jamb to side jamb. Measure
across the top, middle and bottom to find
the smallest dimension
. The smallest
measurement will be dimension “A”.
4. For the height of the new window measure twice
from the head jamb
(top of frame)
to the sill
get dimension “B” and “C”
. Take three
measurements - one at each side and one in the middle.
5. Measure horizontally between the blindstop and the
interior stop to get Dimension “D”
6. Record dimension “A”
, dimension “B”
and dimension “D”
each window in the chart on the following page.
Note: Kolbe will subtract 1/2" from the width and 1/4" from the height to obtain the actual size of the unit to be built.
This is to make sure that the new unit will fit within the existing opening.
Things To Remember:
Record measurements and round down to the nearest 1/8".
Measure each window, even if they appear to be the same size.
Measuring the Opening:
Figure 1 - Cross Section Detail
3-1/4" jamb depth
Figure 1a - Top View