Category Archives: Roofing
Organic growth, especially algal growth can erode the limestone filler used in roof shingles. Over a period of time, the ceramic granules present on the surface can loosen and then washed off in rainwater. This in turn can reduce the heat-reflecting ability of asphalt shingles, besides shortening their lifespan and compromising their surface integrity.
Algal growth on the roof also paves the way for the growth of lichens and moss, which usually thrive in the gullets and edges of the shingles. They keep the roof damp by holding water and moisture, and cause the edges of the roof to lift up making them vulnerable to wind damage and leaks. Therefore, regular cleaning is an important part of roof care and maintenance, not only to maintain the aesthetic value of your house, but to increase the longevity of roof shingles.
Cleaning Roof Shingles
Before You Begin
Soak shrubs and all surrounding foliage close to the house with the garden hose. This will help protect your lawn and garden plants from the cleaning solution to be used on the roof shingles. Be sure to take all possible precautions to prevent any accidental fall or slip. It is better to have someone, a friend or a family member nearby, in case if you need any help. Use a sturdy ladder to climb onto the roof. To prevent slipping, be sure to wear non-slip shoes. You should also wear safety glasses and gloves during the entire cleaning session.
Things You Will Need
To clean your roof shingles, you will need a garden hose, a broom or sponge mop for scrubbing the surface, and a cleaning solution. Commercial cleaning products recommended by the manufacturer can be used for this purpose, or you can make a homemade cleaning solution by combining 1 cup chlorine bleach and ¼ cup trisodium phosphate with 4.5 liter water. You can also add a cup of detergent powder to this mixture to increase its degreasing ability.
Spray the Cleaning Solution
Spray the homemade cleaning solution on the roof shingles with the help of a sprayer, preferably with a pump sprayer. Allow the solution to stay on the roof for about 15 to 20 minutes. Work from the bottom of the roof, if you are standing on the roof while cleaning it. Stand at the peak of the roof and work in sections beginning with the lowest portion and then gradually working your way up. This way, you can avoid standing on wet shingles, as wet roof shingles can be quite slippery. It is better to clean the roof on a cloudy day, as this will prevent the cleaning solution from drying quickly.
Scrub with a Soft Broom or Sponge Mop
To clean the dirtier areas of the roof, you can use a broom or a sponge mop. Scrub the areas that are extremely dirty with the sponge mop or the broom while the cleaning solution is still there. However, be sure to scrub the surface gently, as vigorous scrubbing may damage the granular surface of the shingles.
Rinse the Roof
Once you are done with scrubbing the dirtier part of the roof, use a garden hose to rinse the roof shingles. Be sure to rinse the entire roof properly, as chlorine bleach can damage the shingles, if it is allowed to stay on them for a long time. If you have rain gutters installed on your roof, then push the dirt and debris to the gutters with the help of the garden hose. But be sure to rinse the gutters and the downpipes properly. Otherwise, the cleaning solution may corrode them. At the end of the cleaning session, rinse the garden plants and your lawn properly.
Cleaning Wood Shingles
Wood shingles are preferred by many architects and builders for their natural look and superior performance, especially in areas that experience high winds and hails. However, wood shingles are more susceptible to rotting, splitting, and warping, compared to asphalt shingles.
Like asphalt shingles, wood shingles need regular cleaning, as the accumulated debris can retain moisture and prevent the shedding of water from the roof, paving the way for the growth of wood-rotting fungus on the shingles. Wood shingles can be cleaned with the help of a garden hose and a soft broom, as explained above.
The use of pressure washing for cleaning roof shingles, especially wood shingles is a controversial topic. Excessive and imprudent use of pressure washers can erode the surface of wood shingles. So, it is better to get the condition of the roof evaluated by a professional roof cleaner before opting for pressure or power-washing. If pressure washing is required, be sure to use the minimum force possible, and give your roof a topical treatment afterwards.
Care and Maintenance of Roof Shingles
To prevent or minimize the growth of mold, mildews, and algae on the roof, take the necessary steps to improve the circulation of air, and increase the amount of sunlight the roof receives. This can be done by removing the overhanging tree branches that shade certain areas of the roof. Make sure that tree branches do not touch or rub against the roof, by pruning them at regular intervals.
To prevent algal growth on the roof, you can place zinc or copper strips near the ridge. Whenever it rains, the rainwater will come in contact with the metal strips, take up ions from them, and produce a chemical reaction that can inhibit the growth of algae and mildews. You can also opt for shingles with algae-resistant granules to avoid this problem altogether.
While using a commercial cleaning product, always follow the instructions mentioned on the label of the product. Apart from cleaning products, certain chemicals are available, which if applied on the roof once or twice a year, can considerably reduce the growth of mold and mildews. You can opt for these products, or do simple regular cleaning to maintain the look of your roof and increase its durability.
In a green roof system, the roof is covered with a waterproofing membrane, above which plants are grown. The waterproof membrane protects the building from water seepage, which can cause damage to the structure. Apart from the waterproofing membrane, this system requires additional layers, for drainage and irrigation. A layer that acts as a root barrier, is also required. This system helps to absorb rainwater, lowers the temperature in cities, provides insulation, and also offers a habitat for birds. A green roof, is also known as living roof, eco-roof, vegetated roof, or oikosteges.
Types of Green Roof
Green roofing system is classified into two types – intensive and extensive. This categorization is based on the amount of irrigation required, depth of planting medium, and the amount of maintenance required. Intensive ones require a good depth of soil to accommodate the growth of large plants and lawn grass. Such green roofs need more labor, power, irrigation, maintenance, and plant food. They can house any plant, from small trees to shrubs; and are easily accessible, like a park. Extensive ones are not meant for access, except for maintenance. Such a roof requires very less maintenance, usually once a year, for weeding or for fertilization. Normally, a thin layer of soil is sufficient for an extensive green roof top. A green roof system can also be differentiated as pitched and flat. Flat ones require more care with regard to waterproofing and drainage, as compared to pitched ones, which have slanting roof surfaces.
Tips for Building a Green Roof
-The first and foremost task is to obtain the permit to build a green roof in your building, from the concerned authority. Normally, this is issued by the Department of Construction and Permits. If you want to ease this process, you can hire a roofing company to do the job for you, and they will obtain all the permits necessary.
-Do some research regarding the designs, and select one which is suitable for your building. You can even take the help of professionals for this purpose. Choose the type of green roofing (extensive or intensive) and the type of vegetation. It is very important to check whether your building is capable of bearing the load of the additional fixtures. It is observed that some old constructions are not well-equipped to accommodate a green roofing.
-If you are through with the first two steps, the next one is waterproofing the roof. Use a waterproof membrane to protect your building. There is a wide range of materials available for this purpose. You can use asphalt sheeting or specialized rubber sheets which are made for this purpose. Always make sure that the edges are covered.
-After waterproofing, install the root barrier. You can go for concrete or cellular glass, which is good for insulation.
-Next is the drainage layer. It helps in carrying the excess water to gutters, and prevents water retention on the roof. -Normally, the drainage layer consists of gravel and pumice.
-Buy some good filter fabric, which allows the flow of water to the drainage layer, but prevent the movement of soil or growing medium to the lower layer. Usually, polyester or polypropylene is used for this purpose.
-The next layer is the growing medium. You can use cleaned top soil mixed with sand, or crushed clay and humus. -Local soil is also good, but it has a possibility of growing weeds and pathogens. The ideal soil depth is said to be three inches.
-Drip irrigation is considered the best, at least for the first year of installation. This irrigation system is advantageous in saving water and your time, and is also useful in adding fertilizer.
-Select those plants, which are suitable for the local climate and environment. Give preference to those plants which are tolerant of sun, wind, frost, and drought.
Your green roof is ready. Don’t you think it is easy to install a green roofing system? You can also take the help of designers who are specialized in this area.