Vinyl Siding INTRODUCTION Vinyl siding, like any exterior wall cladding, is a very important component of a high performance home. Its primary function is to shed the majority of the bulk water that comes in contact with the external walls of the house. Vinyl siding is designed to be hung loosely enough so that it can expand and contract with temperature changes without becoming damaged. Vinyl siding, by design, allows water to enter and exit behind it. As a result, it is critical that there be an effective drainage plane and weather resistive barrier (WRB) underneath vinyl siding to prevent significant amounts of water intrusion into the interior of the walls. While there are several different types of vinyl siding, this scope addresses lap vinyl siding, which is the most commonly used vinyl siding in most regions. For each vinyl siding product that is to be installed, the trade contractor should review and follow the manufacturer’s installation instructions for that specific product. Most of the issues addressed in this scope are relevant to other types of vinyl siding, though specific installation instructions will differ slightly from product to product. Purpose of Vinyl Siding The purpose of this Scope of Work is to provide the builder and trade contractor with effective communication about the design and construction of vinyl siding to properly achieve the desired results in a high performance home. Specifically, the aim of the scope is to facilitate the installation of vinyl siding that effectively sheds bulk water [BCQC-2] and is durable over time. Certain vinyl siding products with integrated rigid insulating sheathing may also provide additional insulating qualities to the wall assembly. Builders Challenge The Builders Challenge certification program is used to confirm that certified homes are designed to achieve at least a minimum level of energy performance that exceeds current efficiency requirements by 30% and to document their as- built performance levels, even including net-zero energy homes (ZEH). In addition to the energy performance requirement of the Builders Challenge, there is a set of Builders Challenge Quality Criteria (BCQC) representing high performance home best practices. The complete set of BCQC requirements and the Builders Challenge Quality Criteria Support Document can be found at: Builders Challenge Quality Criteria Support Document. A builder may also use the Scope of Work to verify that the Builders Challenge criteria relevant to each trade contractor have or have not been completed by each of their trade partners. Builders Challenge items are indicated throughout Disclaimer Neither the NAHB Research Center, Inc., nor any person acting on its behalf, makes any warranty, express or implied, with respect to the use of any information, apparatus, method, or process disclosed in this publication or that such use may not infringe privately owned rights, or assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method or process disclosed in this publication, or is responsible for statements made or opinions expressed by individual authors. the scopes of work and checklists. They are denoted by a gray highlight. In addition, a note in italics accompanies the provision noting which Builders Challenge Quality Criteria the item addresses. For example, [BCQC-2] stands for Builders Challenge Quality Criteria item number 2. Vinyl Siding as a Material (Storage, Transportation, and Installation) When transporting vinyl siding to a job site, make certain to keep the cartons flat and supported along their entire length. At the job site, take the following precautions when storing vinyl siding: Keep the cartons dry. Store the cartons on a flat surface and support the entire length of the cartons. Do not store the cartons in stacks more than six boxes high, and make sure the stacks are stable. Store the cartons away from areas where falling objects or other construction activity may cause damage. Do not store the cartons in any location where temperatures may exceed 130° F/54.4° C (e.g., on blacktop pavement during unusually hot weather or under dark tarps or plastic wraps without air circulation). Vinyl siding materials expand and contract noticeably due to temperature change and must be attached loosely but securely to allow for this movement to occur without damage to the siding. See fastening details below. It is normal for vinyl building products to expand and contract with temperature changes. To assure a successful siding installation, you must allow for movement during application. Use the following guidelines to determine space required for expansion and contraction between siding and trim. Remember, a ½ % for every 10 Degrees F expansion coefficient means a 16’ piece of vinyl siding will expand or contract nearly 1 inch in just a 10 Degree temperature swing. ¼” at both ends of the panel when the temperature is above 40°F at time of application. ¾” at both ends of the panel when the temperature is 40°F or below at time of application. Disclaimer Neither the NAHB Research Center, Inc., nor any person acting on its behalf, makes any warranty, express or implied, with respect to the use of any information, apparatus, method, or process disclosed in this publication or that such use may not infringe privately owned rights, or assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method or process disclosed in this publication, or is responsible for statements made or opinions expressed by individual authors.