Sofia Martinez
When installing corrugated roofing sheets, it's important to consider the amount of overlap required to ensure a secure and long-lasting roof. The amount of overlap will depend on the pitch of your roof and whether you are overlapping the sheets widthways or lengthways. For widthways overlaps, a minimum of one or two corrugation peaks is recommended, depending on the pitch of your roof. For lengthways overlaps, the amount of overlap will vary between 18 and 32 cm, again depending on the pitch.
| Characteristics | Values |
|---|---|
| Minimum widthways overlap | One or two corrugation peaks |
| Widthways overlap for pitch greater than 10° | One corrugation overlap |
| Widthways overlap for pitch less than 10° | Two corrugation overlaps |
| Lengthways overlap for pitch of 15° or over | 180 mm or 18 cm |
| Lengthways overlap for pitch between 10-15° | 220 mm or 22 cm |
| Lengthways overlap for pitch between 5-10° | 320 mm or 32 cm |
| Overlap between panels | 3–4 in (7.6–10.2 cm) |
What You'll Learn
Overlapping corrugated roofing sheets depends on the pitch of your roof
The amount of overlap required for corrugated roofing sheets depends on the pitch of your roof. For a pitch greater than 10 degrees, you should overlap the sheets by one corrugation peak. For a pitch less than 10 degrees, you should overlap the sheets by two corrugation peaks. You can also overlap more than two corrugations if you don't want to trim the sheets at the edge.
For longer roofs, you will also need to overlap the sheets lengthways. The amount of overlap lengthways also depends on the pitch of your roof. For a pitch of 15 degrees or more, overlap the sheets by 18 cm. For a pitch between 10 and 15 degrees, overlap by 22 cm. And for a pitch between 5 and 10 degrees, overlap by 32 cm.
It is important to remember to allow space for Rock N Lock Flashing when installing corrugated roofing sheets. Rock N Lock Flashings are manufactured in a gable or wall option to suit your roof configuration. Additionally, you should secure the roofing sheets with screws or butyl tape and seal any seams with sealant to ensure a watertight installation.
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Overlapping corrugated roofing sheets lengthways
When installing corrugated roofing sheets, it's important to consider the direction of the prevailing wind in your location. This will help reduce wind uplift and increase the life span of the roof.
For longer roofs, you will need to overlap the corrugated roofing sheets lengthways. The amount of overlap depends on the pitch of your roof:
- Roof pitch of 15 degrees or more: Overlap of 18 cm or 180 mm
- Roof pitch between 10-15 degrees: Overlap of 22 cm or 220 mm
- Roof pitch between 5-10 degrees: Overlap of 32 cm or 320 mm
It's also worth noting that you can overlap more than two corrugations if you don't want to trim the sheets at the edge. This can be useful if you have some sheet width to lose or if the first corrugation peak is damaged and needs to be trimmed off.
Remember to allow space for Rock N Lock Flashings when installing your corrugated roofing sheets. These are manufactured in a gable or wall option to suit your specific needs.
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Overlapping corrugated roofing sheets widthways
When installing corrugated roofing sheets, it is important to consider the direction of the prevailing wind in your location. This will help to reduce the chance of wind uplift over time and increase the life span of the roof.
The amount of overlap required for corrugated roofing sheets depends on the pitch of your roof. For a pitch greater than 10°, you should overlap the sheets by one corrugation peak. For a pitch less than 10°, you will need to overlap the sheets by two corrugation peaks. If you don't want to trim your sheets, you can overlap them by more than two corrugation peaks.
When installing on a longer roof, you will also need to overlap the sheets lengthways. The amount of overlap lengthways also depends on the pitch of your roof. For a pitch of 15 degrees or more, overlap the sheets by 18 cm. For a pitch between 10-15 degrees, overlap by 22 cm. And for a pitch between 5-10 degrees, overlap by 32 cm.
It is important to remember to allow space for Rock N Lock Flashing when installing corrugated roofing sheets. This will ensure a proper fit and help to increase the life span of the roof. The ridge cap may also require an additional closure strip and sealant.
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Overlapping the trims and caps
When installing corrugated roofing sheets, it is important to consider the direction of the prevailing wind in your location. This will help to reduce wind uplift and increase the life span of the roof. The amount of overlap required for corrugated roofing sheets depends on the pitch of your roof. For a pitch of 15 degrees or more, an overlap of 180 mm or 18 cm is recommended. For a pitch between 10 and 15 degrees, an overlap of 220 mm or 22 cm is suggested. If your pitch is between 5 and 10 degrees, you should overlap the sheets by 320 mm or 32 cm.
It is also important to leave extra space beside corrugated sheets for Rock N Lock Flashings. These are available in gable or wall options to suit your project.
When it comes to overlapping the trims and caps, it is recommended to overlap them by 3-4 inches (7.6-10.2 cm). This will help to ensure a secure and weather-tight installation. You can use additional screws or butyl tape to secure the overlap.
Additionally, it is worth noting that you can overlap more than two corrugations if you don't want to trim your sheets. This can be useful if you have some sheet width to lose or if you have damaged the first corrugation peak during handling.
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Overlapping the panels
When installing corrugated roofing sheets, it's important to consider the direction of the prevailing wind in your location. This will help to reduce wind uplift and increase the life span of your roof. Overlapping the panels is crucial to achieving this.
The amount of overlap required depends on the pitch of your roof. For a pitch greater than 10°, one corrugation overlap is sufficient. If your pitch is less than 10°, you'll need to overlap by two corrugations. You can also overlap more than two corrugations if you don't want to trim the sheets at the edge.
For lengthways overlaps on longer roofs, the amount of overlap required is as follows:
- Pitch of 15 degrees or over: Overlap by 180 mm or 18 cm
- Pitch between 10-15 degrees: Overlap by 220 mm or 22 cm
- Pitch between 5-10 degrees: Overlap by 320 mm or 32 cm
It's also important to remember to allow space for Rock N Lock Flashings when installing your roofing sheets. These can be manufactured to suit your specific needs, whether you have an open side or a sidewall at your gables.
When overlapping the panels, use sealant tape and closure strips to block the underside of the panels and create a secure seal. Overhang the edge by about 4 inches (10 cm) and overlap the panels themselves by 3-4 inches (7.6-10.2 cm), or by one ridge. Secure the panels with 1.5-inch (3.8 cm) wood screws and washers.
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Frequently asked questions
Always overlap corrugated sheets a minimum of one or two corrugation peaks widthways depending on your roof pitch. If your roof has a pitch greater than 10°, overlap one corrugation. If your roof has a pitch less than 10°, overlap two corrugations. You can also overlap more than two corrugations if you don't want to trim your sheets at the edge.
The amount you need to overlap the sheets lengthways depends on the pitch of your roof. If your roof has a pitch of 15 degrees or over, overlap 180 mm or 18 cm. If your roof has a pitch between 10-15 degrees, overlap 220 mm or 22 cm. If your roof has a pitch between 5-10 degrees, overlap 320 mm or 32 cm.
Overlap the trims and caps by 3-4 inches (7.6-10.2 cm).
Overlap the panels by 3-4 inches (7.6-10.2 cm) or by one ridge, more or less.
