! j I I - National Roofing Contractors Association

,~- 19..ty of spanning joists without being supported by a solid deck This item provides information concerning the profile ofand do not require an underlayment. They can be installed the listed panel. Although only one category may be desigonslopes as low as ~ inch per foot. They can also be used nated by a manufacturer for a given product, the inferencein architectural applications. should not be made that this designation excludes descrip-Pan 1 '1\ F 11 . . b . f d . t . f 1 tion of a profile in another categor y as well (e. g ., batten ande £It'es 0 owmg lS a rle escrlp lon 0 pane types . . . . .that appear in the Guide. ~ertlcall~g). The mte?t of thlS category lS slmply to pro,:idemformatlon concermng what the panel profile looks llke,Corrugated The corrugated seam panel has a ribbed pro- not necessarily its total configuration.file and expos~d fas~eners. It can be described as a lap-and- Item 12 FM-UL Wind uPlift Ratingsfasten system, m WhlCh panels are lapped at the edges and T h . . .d . £c' .h h halas ener IS use 0 secure e jomt. .. . . .IS ~ specmcatlon m the manufacturer's product lIne that., t . d t th . . lS Item provI es mlormatlon concermn g w et er t ereFlat Seam The flat seam is created with individual panels may have an FM or UL rating. The exact specification(s) areapplied in shingled application. One panel edge is folded not provided. Readers should refer to the appropriate ULback on top of itself; the other panel is folded under, and or FM guides and directories for details concerning suchthe two panels are hooked together. ratings.Standing Seam The term standing seam is often used as ageneric description for a class of metal roof seams. Moreproperly, the term refers to one of two kinds of profiles, orseam types: (1) the verticalleg/flat pan and (2) the trapezoi.dal seam. The name standing seam derives from the fact thatthe seams are joined together above the panel flats. Thetrapezoidal standing seam is more commonly associated withstructuralpanels.Batten Seam The original batten seam consisted of verticalleg panels placed between wood batten strips and coveredwith a cap. Many batten seam panels today are constructedentirelyof metal.Standing Seam Systems Because architectural standingseam roof systems are installed on steep slopes with shortpanel lengths, they are designed to shed water at a rapidrate and, therefore, they mayor may not have sealant in theseam. The use of short panel lengths also limits the amountof thermal movement that can occur. For this reason, thepanels are attached to the decking with a clip, consistingoften of a single piece without designed allowance for movement,although two-piece clips are available. The panels slideback and forth on the clips.Structural standing seam roof systems typically have afactory.applied sealant in seams to ensure watertightness.The systems commonly employ either glass fiber insulationrolls or rigid-board insulation. Because the insulation canbecome compressed at the structural members, spacer blocksare often placed over the member to prevent thermaloridging.Allowance for thermal movement of the roof panel isprovided by the concealed clips that are formed into thestanding seams during the seaming operation. These clipsare typically of two-piece design and are attached to secondarystructures. The amount of thermal movement is a factorof the length of the panel run, the temperature changesthat the panel will undergo, and the type of material thatmakes up the panels.The seaming process varies. For both the verticalleg/flatpan and trapezoidal profiles, each panel typically has a maleand female profile. There are a variety of seaming, or panelinterlock, methods. Some are formed by mechanical seamersor by hand, such as the crimped (45 degrees), roll formed(180 degrees), double roll formed (two 180 degrees), and rolland lock. Other seam systems do not require mechanicalseaming, such as the snap-on cap and snap.together methods.Categories of DataItem 6 Panel Profile