! j I I - National Roofing Contractors Association

How to Use the Roofing Materials GuideThe Guide will assist you in selecting membranes and insula- 6. List: separately for each candidate (selected in Step 5) thetions best suited to your particular roofing needs. It provides more important properties suited to your specific requireinformationon membrane and insulation products, market- ments reported in the recorded test values published in theing and manufacturing companies, warranties, use limitations, Guide. Some examples may be:history and performance experience, physical and engineer- weighting properties, and more. This information is essential to thestrengthowner/designer in making decisions on the selection and useelongationof membrane and insulation products to meet their specificdimensional stabilityneeds. Similarly, the Guide gives manufacturers and contrac-colortors a reference to assist their customers in the decision-thicknessmaking process and to give them the confidence that the . othersproducts they sell and apply will perform as intended.A unique feature of the Guide is the columnar format used 7. Review: Guide information assembled in Steps 5 and 6throughout This places data on all products side by side for and prepare separate lists of limitations for each of theeasy comparative analysis.candidates.STEPS FOR USING THE GUIDE8. Compare: on the basis of all information collected, makecomparisons between characteristics of the candidates selectedin Step 5 for their suitability to meet your specificI. Detennine the kind of roof job: requirements.. a new roofing system. a replacement roof 9. Select: one to three leading candidates for final consider-. a recover for an existing roof ation and bid.2. List the following factors relative to the job:. building use. climate. 'roof configuration. time of year for application. projected service life. roof traffic. penetrations. expected maintenance. other such parameters specific to your needs3. Review: information on the generic classes of membranesand/or insulations to supplement other information you haveavailable.4. Select: a generic class best suited to specific needs listedin Step 2.-- 5. Select: a number of specific candidates from a genericclass, which was selected in Step 4, based on general informationfrom the Guide and other sources for such criteria as:. product. performance history. warranty provisions. slope restrictions. past experiences and recommendations of others. application methods. climatic restrictions. code provisions. use limitations.-- ' .-8