Standard Guide for Calculating Movement and Other Effects When Establishing Sealant Joint Width

Importancia y uso:

4.1 Design professionals, for aesthetic reasons, have desired to limit the spacing and width of sealant joints on exterior walls and other locations of new buildings. Analysis of the performance factors and especially tolerances that affect a sealant joint is necessary to determine if a joint will have durability and be effective in maintaining a seal against the passage of air and water and not experience premature deterioration. If performance factors and tolerances are not understood and included in the design of a sealant joint, then the sealant may reach its durability limit and failure is a distinct possibility.

4.2 Sealant joint failure can result in increased building energy usage due to air infiltration or exfiltration, water infiltration, and deterioration of building systems and materials. Infiltrating water can cause spalling of porous and friable building materials such as concrete, brick, and stone; corrosion of ferrous metals; and decomposition of organic materials, among other effects. Personal injury can result from a fall incurred due to a wetted interior surface as a result of a failed sealant joint. Building indoor air quality can be affected due to organic growth in concealed and damp areas. Deterioration is often difficult and very costly to repair, with the cost of repair work usually greatly exceeding the original cost of the sealant joint work.

4.3 This guide is applicable to sealants with an established movement capacity, in particular elastomeric sealants that meet Specification C920 with a minimum movement capacity rating of ±12¹/₂ %. In general, a sealant with less than ±12¹/₂ % movement capacity can be used with the joint width sizing calculations; however, the width of a joint using such a sealant will generally become too large to be practically considered and installed. It is also applicable to precured sealant extrusions with an established movement capacity that meets Specification C1518.

4.4 The intent of this guide is to describe some of the performance factors and tolerances that are normally considered in sealant joint design. Equations and sample calculations are provided to assist the user of this guide in determining the required width and depth for single and multi-component, liquid-applied sealants when installed in properly prepared joint openings. The user of this guide should be aware that the single largest factor contributing to non-performance of sealant joints that have been designed for movement is poor workmanship. This results in improper installation of sealant and sealant joint components. The success of the methodology described by this guide is predicated on achieving adequate workmanship.

4.5 Joints for new construction can be designed by the recommendations in this guide as well as joints that have reached the end of their service life and need routine maintenance or joints that require remedial work for a failure to perform. Guide C1193 should also be consulted when designing sealant joints. Failure to install a sealant and its components following its guidelines can and frequently will result in failure of a joint design.

4.6 Peer reviewed papers, published in various ASTM Special Technical Publications (STP), provide additional information and examples of sealant joint width calculations that expand on the information described in this guide (2-5). For cases in which the state of the art is such that criteria for a particular condition is not firmly established or there are numerous variables that require consideration, a reference section is provided for further consideration.

4.7 To assist the user of this guide in locating specific information, a detailed listing of guide numbered sections and their headings is included in Appendix X1.

Subcomité:

C24.10

Referida por:

C1535-05R23, C1193-16R23, C1481-12R24, C0981-20, C0898_C0898M-09R24, C1397-13R19, C1401-23, C1564-20

Volúmen:

04.07

Número ICS:

91.100.50 (Binders. Sealing materials)

Palabras clave:

bridge joint; butt joint; construction tolerance; expansion joint; fillet joint; moisture movement; performance factor; sealant; sealant backing; sealant joint design; thermal movement;