Voluntary Specifications and Test Methods for Sealants

Transcription

1 Task Group Approval 800 Committee Approval Product Group Approval Approved at June Conference Out for Re-Ballot (#801-15) Out for Re-Ballot (#802-15) PUBLICATION NO. AAMA 800-XX DRAFT #19 DATED 5/19/15 Voluntary Specifications and Test Methods for Sealants PROPOSED REVISIONS TO SECTION 808.3

2 TABLE OF CONTENTS 1.4 PERIMETER SEALING COMPOUNDS FOR FIELD INSTALLATION(808.3)... 1 This voluntary specification was developed by representative members of AAMA as advisory information and published as a public service. AAMA disclaims all liability for the use, application or adaptation of materials published herein. AAMA 800-XX, Section 808.3, Draft #19, 5/19/15 Copyright 2014 American Architectural Manufacturers Association 1827 Walden Office Square, Suite 550, Schaumburg, IL Phone: 847/ Fax: 847/ webmaster@aamanet.org Web Site: Page i

3 1.4 PERIMETER SEALING COMPOUNDS FOR FIELD INSTALLATION (808.3) Purpose To provide a minimum level of quality for perimeter sealing compounds for field installation of fenestration products. Compounds shall be classified as: 808.3(Type I) 808.3(Type II) Scope This specification is limited to sealing compounds that are used for the installation of fenestration products. This specification covers sealing compound requirements but does not cover the installation process or proper use of materials. NOTE 1: While these products may meet AAMA 808.3, it may be advisable to test these materials on additional substrates for adhesion, compatibility, and staining per project specification. These compounds are intended toshould remain elastic or ductile for a limited time and in order to prevent air infiltration and water leakage through the anticipated service life of the joint per sealant manufacturers specification. The tests provided in this AAMA standard include durability and serviceability in order to evaluate the long term performance of the compounds (Type I) Sealing Compounds are limited to pumpable and gunnable compounds. o (Group A) Sealing Compounds are recommended for applications for which prolonged UV exposure is not expected. o (Group B) Exterior Sealing Compounds are recommended for applications for which prolonged UV exposure is expected (Type II) Sealing Compounds are limited to preformed, 100% solids, ductile, extruded, or calendared mastic type tapes. o (Group A) Sealing Compounds are recommended for applications for which prolonged UV exposure is not expected. Comment [Reasoning1]: A revision was made to Section Scope - This was made to better identify time parameters for the product's longer term performance. Changes in wording from "are intended to" to "should" and "for a limited time" to "the anticipated service life" provides greater clarification to both the manufacturer and the end user. Comment [Reasoning2]: References throughout the document creating Group A and B materials were removed. At this time there is no testing to support differentiation between those materials that will see prolonged UV exposure and those that will not see prolonged UV exposure. Unless and until this testing is completed the testing is based on assumptions rather than facts. AAMA 800-XX, Section 808.3, Draft #19, 5/19/15 Page 1

4 o (Group B) Exterior Sealing Compounds are recommended for applications for which prolonged UV exposure is expected Definition Perimeter sealing compounds seal the joint between the building construction materials and fenestration products and are intended to remain elastic or ductile and to permit moderate movement without bond failure Performance Requirements Compounds shall be tested according to type: (Type I) Sealing Compounds are limited to pumpable and gunnable compounds Basic Visual Screening There shall be no surface cracks, bond loss, staining or vehicle bleed in any of the three samples when tested in accordance with of AAMA 800. Slight chalking and color change shall be permitted. For Group B compounds, the UV exposure times specified in of AAMA 800 shall be tripled Hardness Evaluation Shore "A" hardness on all three samples shall not exceed 55 when tested in accordance with ASTM C661 as modified in of AAMA 800. For Group B compounds, the UV exposure times specified in of AAMA 800 shall be tripled Peel Adhesion All panels shall have at least a 75% cohesive failure of at least 0.88 N/mm (5 lbf/in) of width when tested in accordance with ASTM C794 as modified in (Test A) of AAMA Slump The compound shall have a slump of not more than 2.5 mm (0.1 in) when tested in accordance with ASTM D2202 as modified in 2.6 of AAMA Vehicle Migration There shall be no vehicle migration from the compound edge when tested in accordance with ASTM D2203 as modified in of AAMA 800. Contact stain through the paper is allowable. AAMA 800-XX, Section 808.3, Draft #19, 5/219/15 Page 2

5 Low Temperature Flexibility The compound when tested in accordance with ASTM C734 as modified in of AAMA 800, shall not have cracks and/or loss of adhesion from the test panel Staining The compound when tested in accordance with 2.10 of AAMA 800 shall not discolor and/or stain the concrete or wood beyond the applied bond line. NOTE 2: In cases where the sealant is in contact with a different kind of substrate, the enduser is responsible for evaluating the staining potential Water Resistance There shall be no presence of voids, cracks, separation, or breakdown of the compound when tested in accordance with Section of AAMA (Type II) Sealing Compounds are limited to preformed, 100% solids, ductile, extruded, or calendared mastic type tapes Basic Visual Screening There shall be no surface cracks or bond loss in any of the samples when tested in accordance with ASTM C772 as modified in Section of AAMA of AAMA 800. For Group B compounds, the exposure times specified in ASTM C772 and of AAMA 800 shall be tripled. Comment [Reasoning3]: A correction in Section was made to the correct reference later in the document from "2.1.2" to "2.8.2" Hardness Evaluation The Shore "A" hardness of all samples shall not exceed 60 after aging tests and not increase more than 30% from the original value when tested in accordance with ASTM C661 as modified in Section of AAMA 800. For Group B compounds, the exposure times specified in ASTM C661 and of AAMA 800 shall be tripled Yield Strength Both initial and heat aged tests for all samples shall result in a minimum of 41.4 kpa (6 psi) when tested in accordance with ASTM C908 as modified in Section 2.5 of AAMA Sag AAMA 800-XX, Section 808.3, Draft #19, 5/19/15 Page 3

6 The tape shall not sag more than 1.6 mm (1/16 in) when tested in accordance with Section of AAMA Vehicle Migration There shall be no vehicle migration when exposed per Section and tested in accordance with ASTM C772 as modified in Section of AAMA 800. Vehicle migration shall not exceed 3 mm (1/8 in) from the edge of the tape when exposed per Sections and when tested in accordance with ASTM C 772 as modified in Section of AAMA Low Temperature Flexibility The tape shall not crack or suffer loss of adhesion from the test panel when tested in accordance with ASTM C765 as modified in Section of AAMA Water Resistance There shall be no presence of voids, cracks, separation or breakdown of the tape when tested in accordance with Section of AAMA Backing Removal There shall be complete removal of the backing paper or support. Backing paper or support must not tear or adhere to the tape when tested in accordance with ASTM C879 as modified in Section 2.13 of AAMA Specifier Guidelines The following information provides guidance on criteria that should be considered for incorporation into specifications. Where applicable the following can be inserted into the project specifications. If required, the sealant manufacturer shall provide product submittals for the sealant that are used in perimeter sealing applications Include information regarding use of sealant for exterior applications to withstand limited UV(Group A) or prolonged UV(Group B)UV exposure. The sealant manufacturer shall determine product classification based on manufacturer testing. Although there is no substitution of natural sunlight for weathering, there are many accepted methods used for accelerated weathering. Some methods include ASTM C1442, ASTM C732 and ASTM C793. AAMA 800-XX, Section 808.3, Draft #19, 5/219/15 Page 4

7 Include information regarding the movement capability of the sealant. W when tested in accordance with ASTM C719. NOTE 3: The sealant shall be specified such that the movement of the joint does not exceed the movement capability of the sealant. Common classes of the sealant are as follows: ± 12.5%, ± 25%, ± 35% ± 50% +100/-50% Include information regarding the chemical compatibility of the sealant. NOTE 4: End User Responsibility The End User is required to determine chemical compatibility to the substrates in the application. Sealants used in the installation of fenestration products may adversely affect the substrates and other compounds used. Interactions between the sealant and its adjacent materials may cause aesthetic or chemical changes in any of these materials. Therefore, the user shall be responsible for affirming the suitability of the sealant tested to this specification within their installation. Comment [Reasoning4]: A conversion of Note 4 to Section to provide better definition as to the responsibilities of the end user to properly understand impacts that between materials. AAMA 800-XX, Section 808.3, Draft #19, 5/19/15 Page 5