Pergola is the wooden structure standing in your lawn or garden or the attached pergolas with no covered roof. Mostly, pergolas are made with sparsely wooden sticks leaving space there. Sometimes, these spaces are made in the roof of pergola deliberately with the idea to cover them. In flat shaped roof of pergolas, the wooden planks are attached in horizontal position cover the empty space and make them bright and unique colors and styles. Fine quality fabric is available in the market in various colors and you can spread these fabrics over roof of pergolas. People can try clear plastic cover including lexan, acrylic or polycarbonate cover and place it on the rafters of the attached pergola. This is the less expensive option you can exercise for your pergola designs. There is one disadvantage of the flat roof or cover of pergolas, that debris and dirt can be accumulated there. It will give awkward look of your home. It is effective to use water resistant fabric on the roof of pergola design but rain water can be collected over the fabric and it can be got worse and ended with its tear. The heap of dirt over the fabric can also be cause of this wear and tear of pergola cover. To avoid this problem, you should opt for the elevation in the middle of the pergola design, then it can be covered with any material, which you like most. You can also create little hump in the middle of pergola design, which will not allow dirt to accumulate over its roof.