Different materials have different coefficients of linear expansion.
Some components may be exposed to a greater degree of temperature change than others; for example, exterior panels will have a greater temperature-range exposure than the interior structure to which attachment is made.
Movement of two components occurs in different directions; for example, panel lengths must accommodate vertical, or ridge-to-eave, movement, and ridge flashing must accommodate horizontal movement.
All of the listed choices could be reasons.
Transient - attached
Gravity - soldered
Drag - fixed
Construction - welded
The metal panels are "Attached" at the Ridge and Hip - Sideslope movement is expected to occur
The metal panels are "Fixed" at the Ridge and Hip - Upslope movement is expected to occur
The metal panels are "Fixed" at the Eave and Valley - Upslope movement is expected to occur
The metal panels are "Fixed" at the Ridge and Hip - Downslope movement is expected to occur
True
False
A = The component that is fixed to the metal panel. B = The opening / slot allows the metal panel to move at a different rate than the substrate. C = The component adhered to the substrate.
A = The component that is fixed to the substrate. B = The opening / slot allows the metal panel to move at a different rate than the substrate. C = The component fixed to the metal panel.
A = The component that is fixed to the metal panel. B = The opening / slot allows the metal panel to move at a different rate than the substrate. C = The component fixed to the substrate.
A = The component that is fixed to the substrate. B = The opening / slot allows the metal panel to move. C = The component fixed to the substrate.
True
False
The blanket insulation is fully adhered to the purlin. The clips are fixed to the metal roof panel and the purlin.
The blanket insulation is fully adhered to the purlin. The clips are fixed to the thermal spacer block.
The blanket insulation is loose layed on the purlin. The clips only fixed to the metal roof panel.
The blanket insulation is loose layed on the purlin. The clips are fixed to the metal roof panel and the purlin.
True
False
True
False
True
False