How To Install Onduline Roofing Sheets

November 30, 2025

2 min read

dilshadakram

To install onduline roofing sheets, you need to prepare your roof base, lay down the sheets in rows, and secure them with nails or screws using the right overlap. Onduline is a lightweight, corrugated roofing material that works well for sheds, garages, and homes. It costs less than many other roofing types and lasts a long time. Installing it yourself can save you money, but you must follow the steps carefully to avoid leaks and damage. According to industry data, roof installation costs range from $4 to $40 per square foot, so choosing the right material and method matters for your budget.

What Do You Need Before Starting?

Start by checking your roof frame and base. Your roof deck must be flat, clean, and strong. Remove any old roofing, dirt, or loose pieces. Measure your roof carefully to know how many sheets you need.

Gather your tools and materials. You will need onduline sheets, roofing nails or screws, a hammer or drill, a chalk line, a utility knife, and safety gear like gloves and a helmet. According to RubyHome, the average roof replacement cost is $9,526, so buying quality materials now saves money later on repairs.

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How Do You Lay the First Row?

Start at the lowest point of your roof. Place the first onduline sheet so it hangs over the edge by about 2 inches. This overhang helps water drain away from your walls.

Nail the sheet to your roof frame. Use 10 to 12 nails per sheet, placing them along the ridges of the corrugated pattern. Never nail in the valleys, as water can get inside. Space your nails evenly so the sheet stays flat and tight.

What About Overlaps and Rows?

Each new sheet must overlap the one below it. Overlap the side edges by one full corrugation (the ridged part). Overlap the top and bottom edges by at least 4 inches. This overlap keeps rain and wind from getting under your roof.

Work your way up the roof, row by row. Keep your lines straight using a chalk line. According to the U.S. Bureau of Labor Statistics, there are 135,140 roofers employed in the U.S., and most follow these key overlap rules to make roofs last longer. For a 1,700 square foot roof, expect to use many sheets and spend time getting this right.

Onduline Installation Step	Key Detail
Sheet Placement	Start at the lowest point with 2-inch overhang
Nailing	Use 10-12 nails per sheet along ridges only
Side Overlap	One full corrugation minimum
Top/Bottom Overlap	At least 4 inches
Spacing	Keep lines straight using chalk line

How Do You Finish the Roof?

Seal all edges and gaps. Use onduline-compatible sealant around flashing, vents, and chimneys. Cut sheets with a utility knife or hand saw to fit around pipes and edges.

Install ridge caps at the top of your roof. These pieces cover the peak and seal the gap between the two roof sides. Nail them securely. According to industry data, metal roofing lasts 40 to 80 years, while onduline typically lasts 25 to 50 years, so proper sealing helps your roof stay strong. Take your time with this final step to keep water out for many years.

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Contact a qualified roofing solutions for expert guidance on roof repair, replacement, or installation.