Metal Sales Snap-Loc 24 Installation - Manual (Page 15)

© Metal Sales Manufacturing Corporation / Subject to change without notice. 10/99
SNAP-LOC 24
14
DESIGN / INSTALLATION CONSIDERATIONS
CONDITION OF SUBSTRUCTURE
Whether over solid substrate or open structural framing, panel distortion may occur if not applied
over properly aligned and uniform substructure.
The installer should check the roof deck for squareness before installing Snap-Loc 24 panels. Several
methods can be used to verify squareness of the structure for proper installation of the panels.
METHOD "A" - One method for checking the roof for squareness is to measure diagonally across one
slope of the roof from similar points at the ridge and eave and obtain the same dimension.
METHOD "B" - The 3-4-5 triangle system may also be used. To use this system measure a point from
the corner along the edge of the roof at a module of three (3). Measure a point from the same corner
along another edge at a module of four (4). Then by measuring diagonally between the two points
established, the dimension should be exactly a module of five (5) to have a square corner. Multiple
uses of this system may be required to determine building squareness. If the endwall cannot be made
square, the roof system cannot be installed as shown in these instructions.
METHOD "B"
METHOD "A"
30
30
3
4
5