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Successful Vinyl Siding Application

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					                                               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.

				
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