A M E R I C A N A R C H I T E C T U R A L AAMA 2400-10 Standard Practice for Installation of Windows with a Mounting Flange in Open Stud Frame Construction for Low Wind/Water Exposure M A N U F A C T U R E R S A S S O C I A T I O N
INTRODUCTION ................................................................................................ 1 1.0 SCOPE ......................................................................................................... 1 2.0 REFERENCED DOCUMENTS..................................................................... 2 3.0 DEFINITIONS ............................................................................................... 2 4.0 SIGNIFICANCE AND USE..............................................
INTRODUCTION This practice addresses the recommended methods and/or sequences used to apply/modify the water-resistive barrier or other flashing and sealing materials to the open-framed opening. For sheathed wall installations refer to ASTM E2112, “Standard Practice for Installation of Exterior Windows, Doors and Skylights”.
2.0 REFERENCED DOCUMENTS References to the standards listed below shall be to the edition indicated. Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as to referring to the latest edition of that code or standard. 2.
3.6 SEALANT: Any of a variety of compounds used to fill and seal joints or openings in wood, metal, masonry, and other materials, as contrasted to a sealer; which is a liquid used to seal a porous surface. NOTE 1: Some common types of sealants are: polysulfide rubber, silicone, acrylic latex, butyl rubber and polyurethane. 3.7 SHIM: A thin, flat or wedge shaped piece of suitable material used to level or plumb a window frame during installation. 3.
5.2 COMPATIBILITY All materials such as, but not limited to, coatings, flashings and sealants that come into contact with each other shall exhibit chemical compatibility for the intended purpose (see AAMA 713). 5.3 CORROSION RESISTANCE 5.3.1 Metal products shall be isolated from dissimilar or corrosive materials with a nonconductive coating or sealant material. 5.3.2 All fasteners shall be corrosive resistant, in accordance with ASTM B456, B633, or B766 as indicated in AAMA TIRA9. 5.
5.7.3 Method A (flashing over the face of the mounting flange) 5.7.3.1 A strip of approved mechanically-attached or self-adhered flashing material shall be applied in a weatherboard fashion around the full perimeter of the opening according to the following procedures: 5.7.3.2 Apply the first strip horizontally immediately below the sill, cut it sufficiently long to extend past each side of the window, so that it projects even with the vertical jamb flashing to be applied later (see Figure 2).
5.7.4.3 Fasten or adhere the top edge of the sill flashing to the framing. For mechanically attached flashing place fasteners along the edge of the rough opening where they will be covered by the mounting flange of the window later. Fasten or adhere the top edge of the sill flashing, but do not fasten or adhere the lower edge or the last 230 mm (9 in) of each end, so the water-resistive barrier applied later may be slipped up and underneath the flashing in a weatherboard fashion (see Figure 2). 5.7.4.
6.0 POST-INSTALLATION PROCEDURES 6.1 After installation is complete, check the window for proper operation and locking. 6.2 Ensure that flashing materials are covered (installation of exterior wall surface) in a time frame recommended by the flashing manufacturers. 6.3 Damaged flashings or water-resistive barriers shall be repaired prior to installation of exterior wall surface in order to ensure the continuity between the water-resistive barrier and the new materials. 6.4 Maintain a minimum 6 mm (1/4 in.
7.
FIGURE 1A: Backing Support Attached Around the Perimeter of the Rough Window Opening AAMA 2400-10 Page 9
FIGURE 2: Sill Flashing AAMA 2400-10 Page 10
FIGURE 3A: Window Installation (Method “A”) NOTE 9: In applications where wall sheathing is used, sheathing shall be applied prior to flashing and window installation.
FIGURE 4A: Jamb Flashing (Method “A”) FIGURE 4B: Window Installation (Method “B”) AAMA 2400-10 Page 12
FIGURE 5: Head Flashing AAMA 2400-10 Page 13
FIGURE 6: Primary Water-Resistive Barrier Application by Others AAMA 2400-10 Page 14
APPENDIX A – MODIFY WATER-RESISTIVE BARRIER (Excerpted and modified from the IM-TM, InstallationMasters™ Training Manual) If the water-resistive barrier has already been installed, some modifications will be necessary. Modify the water-resistive barrier in the following manner: 1. When the water-resistive barrier covers the window opening, make a modified “I-Cut” in the barrier as shown in Figure A1. 2. Fold bottom and side flaps over and behind the interior sides of the rough framing. 3.
FIGURE A2: Water-Resistive Barrier - Interior FIGURE A3: Cut Flap at Head and Tape AAMA 2400-10 Page 16
Changes from AAMA 2400-02 to AAMA 2400-10 - Various editorial changes were made - Changed title to be “Open Stud” and specific to “Low Wind/Water Exposure” - Added new “Introduction” Section - Changed coverage from not more than four stories to not more than three stories - Added new Section 1.8 - Removed old Section 1.
American Architectural Manufacturers Association 1827 Walden Office Square, Suite 550 Schaumburg, IL 60173 PHONE (847)303-5664 FAX (847)303-5774 EMAIL webmaster@aamanet.org WEBSITE www.aamanet.
