For operable windows place shims under the vertical jambs to support the weight of the glass as
transferred to the frame through the hinges. Then place shims where shown at the jambs to keep the
frame from bending sideways. To prevent bending of the sill and jambs you must place the shims
within 1" of the positions shown
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4.2 Seal and adjust the anchors
Apply sealant generously on the side of the anchor that will lie flat against the rough opening facing you
(see drawing), near to the edge where it bends. Apply the sealant across the entire width of the anchor
to maintain the continuity of the air barrier when the installation is finished. To ensure compatibility, use
the same sealant that will be used for the entire installation.
The anchors are designed to allow for anchoring the window securely for different gap widths.
Adjusting the anchor to suit the gap is a two-step process: first you pre-bend the anchor towards the
window, and then back against the side of the rough opening. The objective is to have the anchor lie
flat against the side of the rough opening before it is screwed in place.
For narrower gaps, pre-bend the anchor less. For wider gaps, pre-bend the anchor more.
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Start by pre-bending the anchor about 30 degrees from the face of the rough opening, then bend it
back. If it does not lie flat, pre-bend it again, more than before. Continue until there is a consistent feel
for how much you need to pre-bend the anchors for different sizes of gaps. Take a few minutes to
practice how much or how little you need to bend the anchor towards the window in order to have it lie
flat against the rough opening when you bend it back.
To prevent problems later on with wall finishing or window operation, all the anchors must lie flat
against the sides of the opening before they are screwed to the wall. If the bend doesn’t allow the
anchors to lie flat against the opening, the frame will twist when screwed in to place.
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4.3 Place the frames into the rough opening
If the window is a fixed unit, center it in the rough opening with equal spacing on each side.
If the frame has hinges, first determine the thickness of the finish material. Then, position the frame to
allow ¼” clearance between the hinge and the finish material.
DA Bal DA Bal DA Bal DA 41 Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA 50 Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA 11 Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA Bal DA 21 Bal DA Bal DA Bal DA Bal DA Bal DA
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Before fastening anchors to the rough opening make sure the frame is plumb, level and square, even if
the wall isn’t.

Do not fasten the anchors in sequence.
Start by loosely fastening the corners. Then fasten the anchors at the midpoints of the frame and at the
mullions, installing the jamb shims at each anchor location. (there should be shims on either side of the
anchors). Do not twist or deform the frame with the midpoint anchors. Finally, fasten the intermediate
anchors. Alternate fastening from side to side and from top to bottom to lesson the chance of deforming
or shifting the frame out of position.
Use the hole nearest to the window frame to fasten the anchor to the rough opening.
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Remove the anchor tabs by bending or cutting the tabs where they extend past the inside face of the
studs. Be careful to not damage the window or glazing