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How to install corrugated sheets

How to install corrugated sheets

Stephen Wilton Stephen Wilton

Despite some bad press, corrugated roofing sheets still remain the ideal way to roof that shed or outhouse. Its advantages lie in its extensive abilities to both provide sufficient insulation as well as protection from the elements. In addition, its durability and strength are unbeatable as far as roofing is concerned. Here is a guide to the installation of corrugated sheets.

Calculate the number of sheets

Determining the number of sheets you will need to complete the job can be done with a few simple calculations. First, measure the length and width of the roof, preferably in inches. Then, divide the length measurement by the width of the metal sheets (in general, they are 44 inches wide). Next, divide the width of the roof by six - this will indicate the number of columns you need. Finally, multiply the two results together to obtain the correct number of sheets required.

Calculate the number of 'ridge caps' required

Next, determine the quantity of ‘ridge caps’ that the roof requires by taking a measurement of both the edges of the roof as well as the length of the ridges. Make these measurements in feet and inches and then divide the resulting number by six. This will give you the quantity of six-foot ridge caps that you require.

Apply the roofing felt

Before attaching the corrugated tin or PVC sheets, you will need to cover the roof with roofing felt (use a standard roofing felt for this). Apply the felt with staples, ensuring you insert staples at approximately two to three-inches intervals on the outside edges, and at six-inches intervals on the interior. In addition, make sure to overlap the felt by three inches on every sheet.

Start laying the sheets

Starting at one corner, place the first sheet onto the roof. The sheeting should overhang the roof edge by approximately two inches. Attach the sheets using specially designed nails and add a washer to each one. Be careful not to insert the nails into the ridges that form the edge of the sheet. Try to add around twenty nails for every sheet.

Complete the first row

Now, overlap the second sheet onto the first by one ridge width. Line the overlap with a bead of caulk and nail the second sheet into place as you did with the first. Complete the first row by adding more sheets.

Move on to the second row

Begin the second row by overlapping the first by approximately six inches. You need to add more sheets until this row is complete.

Add the ridge caps

When the entire roof is covered, finish the roof’s ridge and the slope edges by adding the ridge caps. These will ensure that no water leaks from the top and sides by protecting the underside of the sheets from harmful exposure.

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