A M E R I C A N A R C H I T E C T U R A L AAMA (Formerly CAWM) Standard ( Formerly CAWM ) Standard Practice for Installation of Windows with a. AAMA (Formerly CAWM ). Standard Practice for. Installation of Windows with a Mounting Flange in. Stud Frame Construction. document was CAWM , Standard Practice for the Installation of Windows In , and using the CAWM as a template, ASTM started work on a.
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Paragraph states 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.
While the note in Figure 2 states Extend sill flashing horizontally to project beyond vertical jamb flashing applied later. This raises two questions. Should the sill flashing be just even with the edge of the jamb flashing or extend past the jamb flashing? If the sill flashing extends beyond the edge of the jamb flashing, how far should it extend? It is AAMA s position that the text in a document is considered authoritative over the text in an illustration.
However, the two statements are not really in conflict with each other. The requirement given in the text represents the minimum requirement necessary to follow the procedures in the standard practice.
Certainly, extending the sill flashing beyond the edge of the jamb flashing exceeds the requirement in the standard practice but exceeding the minimum in this case is not harmful and may be beneficial. If the sill flashing is cut exactly to the width of the window opening plus twice the width of the jamb flashing then it must be installed with some precision since it must align with the edges of the jamb flashing which is applied later.
In addition, if the building framing is constructed without hard sheathing, it may be wise to extend the sill flashing past the next framing stud in the wall. This allows mechanical attachment of the upper corner of the sill flashing to a structural building component and can prevent curling of the ends of the sill flashing which might make installing the window and subsequently the jamb flashing easier and more successful.
Again, the requirements in the standard practice are to be considered a minimum requirement and exceeding the requirements to improve the installation is considered desirable. All AAMA documents are periodically reviewed and updated. The AAMA Western Region currently has a task group looking at developing guidelines for forensic investigations of window installations.
A copy of this letter will be provided to that task group for consideration and may result in this apparent inconsistency being clarified in a future edition of the document. Window Installation Method A Jamb Flashing Method B Jamb Flashing Method A Window Installation Method B This voluntary specification was developed by representative members of AAMA as advisory information and published as a public service. It does not cover the fabrication or assembly of units whether such fabrication takes place in a factory or at the intended installation site.
It does not cover aspects of installation relating to window handling and storage or the safety of the person installing the units. Actual conditions in buildings vary greatly, and in some cases substantial additional care and precaution will have to be taken. It is the responsibility of whomever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
In all cases follow manufacturer s instructions and applicable building codes for any special procedures, applications, or requirements. If such damage or modification has occurred, consult the manufacturer for repair or special installation instructions.
The values stated in SI units are to be regarded as the standard. The values given in parentheses are for reference only. 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. A form of deterioration of metal resulting from the electrochemical reaction that occurs when certain dissimilar metals are in contact in the presence of moisture.
Any building used or intended primarily for a single or multiple family dwelling. A fin projecting from the window frame parallel to the plane of the wall, also known as a nailing fin, for the purpose of securing the frame to the structure.
Sheet material that bridges and protects the joint gap between the window frame members and the adjacent construction for the purpose of preventing water AAMA Page 1. The surface or surfaces of a wall responsible for preventing water infiltration into the building interior.
A thin, flat or wedge shaped piece of suitable material used to level or plumb a window frame during installation. 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.
Some common types of sealants are: Consult with local building codes prior to installation. It further assumes familiarity with caulking and sealing and with glass handling procedures, painting where applicable, and an understanding of the fundamentals of residential construction that affect the installation of these units.
Prior to installation, store windows in a near vertical position in a clean area, free of circulating dirt or debris and protected from exposure to weather elements Field-applied protective coatings may damage window sealants and gaskets and may not be recommended. Contact the window manufacturer before applying any such coatings. To assure adequate clearance, the framer shall follow the manufacturer s literature for the recommended rough opening dimensions.
The framing shall be plumb, square, level, and structurally adequate. The studs shall be free of voids, holes, chipping, twisting, or other conditions that will not allow the sealant to maintain continuous contact.
See Figure 1 5. It is not the responsibility of the window manufacturer to design or recommend a flashing system appropriate to each job condition. The responsibility for protecting any flashing material from damage caused by weather, other trades, or vandalism, and properly integrating the flashing system into the weather resistant barrier for the entire building, is the responsibility of the general contractor or his designated agent Penetration Flashing Material Flashing material shall be barrier coated reinforced and shall provide twentyfour 24 hour minimum protection from water penetration when tested in accordance with ASTM D Flashing material shall carry continuous identification.
ASTM E gives guidance on sealant selection and application. Squeeze out shall be promptly troweled smooth Install the window immediately after sealant application, before a skin forms or contamination occurs on the sealant surface.
Once a method is selected, all procedures of that method shall be performed in the described sequence.
Substitution of a procedure from one method to the other is not permitted If the weather-resistant barrier is applied to the wall prior to the window installation, the weather-resistant barrier may need to be modified.
Flashing shall be applied in a weatherboard fashion around the full perimeter of the opening according to the following procedures: 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 Fasten the top edge of the sill flashing to the framing.
Place fasteners along the edge of the rough opening where they will be covered by the mounting flange of the window later. Fasten the top edge of the sill xawm, but do not fasten the lower edge or the last mm 9 cqwm of each end, so the weather resistant barrier applied later may be slipped up and underneath the flashing in a weatherboard fashion. See Figure 2 For mechanically joined frames, apply sealant at corners the full length of the seam where mounting flanges meet and to the outside of the frame corner joints.
Apply a continuous seal to the backside interior of the window mounting flange in line with any pre-punched holes or slots in the mounting flange.
The window shall then be installed in accordance with Section 5. Apply sealant in line with any prepunched holes or slots on the mounting flange and over the heads of the fasteners. The sealant applied horizontally across the head should not extend beyond the jamb sealant. The application of sealant to the exterior surface of the mounting flange may 59 be necessary if using a selfadhesive type flashing over the mounting flange.
Consult the flashing manufacturer Starting at 995 jamb, embed the jamb flashing into the seal and fasten in place. Do not fasten the bottom mm 9 in of the jamb flashing, so the weather resistant barrier applied later may be slipped up and underneath the flashing in a weatherboard fashion. Cut this flashing sufficiently long so that it will extend approximately 25 cadm 1 in beyond each jamb flashing.
Fasten flashing in place.
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See Figure 5 Method B A strip of approved flashing material shall be at least mm 9 in wide. See Figure 2 Next, fasten strips of flashing along each vertical edge jamb of the opening. Position fasteners along the edge of the rough opening where they will be covered by the mounting flange of the window later. Do not fasten the bottom mm 9 in of the jamb flashing, so the weather resistant barrier applied later may be slipped up and underneath the flashing in a weatherboard fashion Apply a continuous seal to the backside interior of the mounting flange near the outer edge or a continuous seal to the perimeter of the opening at a point to assure contact with the backside interior of the mounting flange.
Apply sealant in line with any pre-punched holes or slots on the mounting flanges. Caution shall be taken to avoid disrupting the continuous seal For mechanically joined frames, apply sealant at corners the full length of the seam where mounting flanges meet and the outside of the frame corner joints.
See Figure 4B In each direction from all corners there shall be a fastener within mm 10 inbut no closer than 75 mm 3 in to prevent frame distortion or fracture of joint seals. See Figure 6 After installation is complete, check the window for proper operation and locking The window shall be installed in accordance with Section 5. Cut the head flashing sufficiently long so that it will extend approximately 25 mm 1 in beyond each jamb flashing.
Embed the bottom of the flashing over the sealant and the mounting flange and fasten in place. The sill must be supported in a straight and level position to prevent sagging, deflection and sill rotation. Some manufacturers require a continuous shim under the window sill.
Follow manufacturer s recommendations Close and lock the window.
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Shim and adjust the window as necessary to achieve a plumb, square and level condition, as well as centering the window in the frame opening. Secure the full perimeter with the minimum equivalent of 6d fasteners on a maximum of mm 16 in centers using pre-punched holes, if provided.
Hinged and pivoted acwm may require additional fasteners located near the hinge or pivot point.
For certain windows it may be appropriate to fasten the head in a manner to allow for possible movement. In all cases follow the manufacturer s instructions for any special procedures or applications NOTE 4: Use an appropriately sized fastener to cover the width of any prepunched hole and adequately secure the window to the structure. In applications where wall sheathing is used, sheathing shall be applied prior to flashing and window installation.
An overview of the proper flashing sequence is shown in figure 1.
Please read entire installation instructions carefully. Apply Weather Resistive Barrier B.
Apply Sill Flashing Tape C. Place Waterproof Sill Shims D. Eagle clad Ascent outswing French door installation instructions These instructions are for typical installation in new typical wood frame wall construction.
These instructions and methods are not intended. We urge you to read and follow the attached installation instructions. Failure to do so may void the warranty of this garden. Read and understand all installation instructions before installing. While the use of these installation instructions.