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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 10. PLANNING AND DEVELOPMENT |
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SubTilte 10-C. HISTORIC PRESERVATION |
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Chapter 10-C23. STANDARDS FOR WINDOW REPAIR AND REPLACEMENT (WINDOW STANDARDS) |
Section 10-C2304. STORM WINDOWS AND WINDOW SCREENS
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2304.1The use of secondary windows or storm windows, either exterior or interior, is encouraged as a means of preserving historic windows. Under the D.C. Construction Code (12 DCMR § 111), a permit is required for the installation of storm windows in historic landmarks or in historic districts.
2304.2Interior Storm Windows
(a)Storm panels should have no intermediate dividing members (mullions or muntins), except on large windows, where any necessary dividing members should align with major divisions of the historic window.
(b)Frames should be narrow and not visible or minimally visible when viewed from the exterior of the building.
(c)Glazing should be only of clear glass or other transparent material.
2304.3Exterior Storm Windows
(a)Sash should fit tightly within window openings without the need for a subframe or panning around the perimeter.
(b)Sash should have no intermediate dividing members (mullions or muntins), except on large windows, where any necessary dividing members should align with major divisions of the historic window.
(c)Meeting rails should be used only in conjunction with double-hung windows and should be in the same relative location as in the primary sash.
(d)The color of the frame members should approximate the color of the primary window frame.
(e)Glazing should be only of clear glass.
(f)The plane of glass in the secondary (storm) sash shall be no more than two (2) inches further forward (towards the exterior) from the plane of the glass in the primary window unless unusual conditions make this infeasible.