جزئیات استاندارد سازنده
Manufacturer’s Standard Details: Nearly all roof membrane manufacturers publish standard details to guide the proper installation of their products. These details should be considered as only a starting point in creating project specific details. The standard details produced by manufacturers represent the lowest acceptable level of performance. Due to competitive market pressures manufactures must keep the base price of their systems low and therefore they keep the standard details as simple as possible. The manufacturer can take an informed risk about the chances of a particular detail performing versus the cost of warranty repairs. Of course, it is the building owner who experiences the leak and suffers the bulk of the damages from this risk evaluation.
Some manufacturers publish enhanced details for high-wind warranties or for premium products. It may be advantageous to include these enhanced details into typical projects for improved performance.
It is important for design professionals to recognize which aspects of a manufacturer’s details can be altered or enhanced and which aspects must be left to the manufacturer. Typically, issues such as seaming, edge attachment, base flashing and drains must comply with the manufacturer’s details. On the other hand, the conditions on the standard details related to the interface with adjacent construction can be modified to include performance enhancements such as tighter air sealing, elevating base flashing on tapered edge strips, extending base flashing higher than minimums, and requiring redundant seals at penetrations.
In conclusion, do not rely exclusively on manufacturers’ standard details and do not allow custom details to be substituted for standard details during construction, unless they are an improvement. The evaluation of the details requires judgment, experience, and expertise in the systems being used.
Reference Details: There are a variety of sources to draw upon for design of details. Various details for low- and steep-slope systems are included in The NRCA Roofing Manual. The NRCA details are available on a CD-ROM and should be utilized as described herein. These details can be modified with CADD or incorporated directly into contract drawings. The NRCA details are widely accepted in the roofing industry and are generally recognized as being suitable for standard conditions.
The NRCA Roofing Manual: Roofing-system-specific details are available from NRCA.
This is one of the most widely recognized technical publications in the U.S. roofing industry and provides extensive information about the design, materials and installation techniques applicable to almost all types of roof systems. It contains the following four volumes:
One volume of the manual is updated each year.
The details included in the 4 volumes of The NRCA Roofing Manual are available on CD. This CD can be used with AutoCAD® software to customize the construction details to fit your specific project needs.
Two noteworthy NRCA details are in the Chapter 10 details in The NRCA Roofing Manual: Membrane Roof Systems. They are the details for equipment support stands and the guide for clearances between pipes/walls/curbs.