5 Tips for Installing Corrugated Sheet Metal Roofing

Corrugated sheet metal can help you create a practical and attractive roof for your home. The metal sheets may be made from iron, steel, copper, tin or aluminum which is produced in a wavy pattern. Corrugated metal sheets are widely regarded for their high resilience and durability. When properly installed, the metal sheets can make an excellent roof for your home which can last for several years. Below are 5 tips to help you install the sheets well.

1.   Calculations

Metal sheets generally measure 36 to 44 inches by 6 feet. A 40 inch metal sheet has a 38 inch coverage area after allowance is made for overlap during installation. Measure the length of the roof ridge in inches. Divide the length by the coverage area. This gives you the number of rows of metal sheets required. Measure the slope from the roof peak to the eaves in feet. Divide by 6 to give you the columns of metal sheets required. Multiply the rows by columns to give the number of metal sheets required for your roof. Repeat the calculations for all surfaces of the roof. For ridge caps required, measure the length of the ridge and perimeter of the roof in feet and add. Divide by 6 to give you the number of 6 foot ridge caps required. It is best to purchase some extra material to cater for future repairs.

2.   Roof Base

A good base is vital for proper installation of the metal sheets. It contributes towards the stability of the roof. Install plywood sheathing over the entire roof surface. Cover with 15 pound roof felting paper. Secure the paper with galvanized staples. Be sure to overlap the felt roofing by about 3 inches along the perimeter of the roof to guard against infiltration of water.

3.   Installation

Begin at the eaves and work your way steadily towards the roof peak. The first row of metal sheets at the roof bottom should overhang the roof by at least 2 inches. This helps to divert water flow away from the roof boards. Allow a 1 to 2 inch overlap between the upper sheet and that below.

4.   Nails

It is best to use nails of the same metal as your metal sheets. When nails of a different metal are used, it can easily cause adverse reactions due to the different properties of metal involved. This results in damages to your roof and more maintenance work. It is a good idea to use galvanized nails of the appropriate metal. The nails should have washers to prevent accumulation of water on the roof. Obtain 3 inch nails. Drive in the nails along the hump on each layer of sheets. Plan to use 20 to 30 nails on each sheet for secure attachment.

5.   Ridge Caps

These help to weatherproof your corrugated metal roof. Once you’ve completed installation of the sheets, you can proceed to install the ridge caps. Place them along the roof ridge and entire perimeter of the roof. They help to keep out moisture, wind, dirt, debris and small animals.