Sheet Metal Flashing and Trim
Use this CSI 3 part SimpleSpecs™ master specification to specify custom-fabricated sheet metal components flashing and trim, gutters, downspouts, copings, facias, and through-wall scuppers, which can be fabricated from a variety of metals.
Sheet metal flashing and trim can be fabricated from a variety of metals including galvanized steel, precoated galvanized steel, aluminum-zinc alloy coated steel, precoated aluminum-zinc alloy coated steel, stainless steel, copper, copper-clad stainless steel, and aluminum. Other metals are also available and can be added to this section.
Sheet metal is difficult to make watertight due to its high coefficient of thermal expansion. For this reason, sheet metal flashings should be placed over a layer of flexible flashing or weather barrier.
Sheet metal is susceptible to waviness in the metal as the metal expands and contracts referred to as oil canning. Oil canning is primarily an aesthetic issue and is worse on wide, flat surfaces. Detailing sheet metal to allow for expansion and contraction will minimize oil canning. In no case should the metal be fastened in a manner that prevents movement. Increasing the gage of the metal has little effect on oil canning.
Refer to the following for assistance in selecting and detailing sheet metal roofing:
– Architectural Sheet Metal Manual by the Sheet Metal and Air Conditioning Contractors National Association (SMACNA) are available line at smacna.org,
– Technical resources by the Copper Development Association (CDA) are available at copper.org
Related SimpleSpecs™ master specifications:
The SimpleSpecs™ master specs concept
Design professionals are accustomed to seeing lengthy project specifications, so why is SimpleSpecs™ so short?
Specifications have grown evermore wordy over the years for several reasons:
The mistaken belief that specifications must be lengthy and legal-sounding to be enforceable. In fact, quite the opposite is true. Having shorter, easily understood specifications makes us less likely to have problems in the field.
A belief that having lots of words protects us from a Contactor making mistakes. There is no way to include enough statements to protect yourself from a bad contractor, regardless of the length of your specification.
Our desire to be in control of the project by specifying means and methods instead of including simple, enforceable statements.
Easier to Edit
SimpleSpecs™ is written as a series of Microsoft word files that include statements that affect construction costs or overall quality and are far simpler to edit than other master specification systems.
Each SimpleSpecs™ specification section is non-proprietary and includes three manufacturers that meet the specified reference standards, descriptive, or performance-based requirements. They are written to allow any listed manufacturers to provide the specified products.
Hidden Guide Text
Each SimpleSpecs™ specification section includes hidden text to inform and guide users in editing the specifications to suit project conditions.
SimpleSpecs™ sections are edited using pre-defined options that are contained in [brackets] or by selecting optional text separated by "OR" statements. Paragraph and page numbering are included as automatic codes, eliminating the need to renumber when revisions are made manually. Global changes to headers, footer, terms, font colors and phrases are easily updated using a third-party search and replace software, available through ZeroDocs.com.