Corrugated panels are made from a variety of materials (fiberglass, fiber-cement, PVC, etc.) and can be transparent, translucent, or opaque. Alongside these panels, there are also so-called trapezoidal panels, which have a folded cross-section that gives them rigidity. They are made of galvanized metal or aluminum and can feature anti-drumming finishes to dampen the noise of rain or be coupled with insulation.
The installation technique is similar for both corrugated and trapezoidal panels. The panels, and in some cases rolls, can come in different sizes. In any case, keep in mind that the installed panels must have an overlap, a superimposition that prevents water from passing underneath the panels.
Panel overlap
The lower the slope of the roof pitch, the greater the vertical overlap should be.
For slopes from 9 to 25 cm per meter, the overlap should be at least 20 cm. For slopes greater than 35 cm per meter, the overlap should be 14 cm.
What are corrugated panels fastened to and how?
The purlins, i.e., the battens stretched between the trusses, serve as the support for the panels. The panels are fastened to them using specific fixings that vary depending on the material the purlins are made of. Purlins can be made of wood or steel.
The purlins must be installed according to the size and characteristics of the panels.
Installing corrugated panels
Installation can be carried out either from left to right or vice versa. If possible, check the direction of the prevailing wind to which the roof is exposed.
For creating the eave, do not exceed a panel overhang of 35 cm maximum. If you are installing a gutter on the edge, do not exceed 20 cm.
Fastening holes should be made at the highest point of the corrugation to prevent water from penetrating under the panel. Fasteners always include a plate or washer with a rubber sealing gasket.
Follow the panel installation layout, checking for squareness relative to the eave line.
Fastening
For wooden purlins, use the appropriate galvanized lag screws. Drive the lag screw into the center of the purlin and at the highest point of the corrugation using a hammer. Then tighten by screwing without over-tightening, to avoid bending or breaking the corrugated panel.
For steel purlins, use the appropriate hook-type lag screws. Cut the protruding portion of the lag screw with a hacksaw.
Cutting corrugated panels
Corrugated panels can be cut to fit the dimensions of the roof pitch. Depending on the material they are made of, use a reciprocating saw with a metal blade for fiberglass panels, an angle grinder with a masonry blade for fiber-cement panels, or with a metal blade for sheet metal panels.
Do you know what a ridge is on a roof?
Once you have paneled the entire roof, you reach the ridge, which must be fastened very securely. The ridge cap is specifically bent at an angle to follow the shape of the roof. Fasten each element with at least two lag screws per side and respect the overlaps.
