Maya Ellison
Plastic roofing cement is a versatile material used for repairing leaks, cracks, and splits in roofs. It can be applied to a variety of surfaces, including concrete, masonry, metal, and wood. When used with a coat of primer, it can effectively bond to absorbent surfaces. However, it's important to note that the surface must be clean, dry, and free from rust or foreign matter to ensure a strong bond. Plastic roofing cement is designed to withstand extreme weather conditions and provides a durable solution for repairing and sealing roofs.
| Characteristics | Values |
|---|---|
| Application | Plastic roof cement can be applied using a trowel, putty knife, caulking gun, spatula, stiff brush, or gloved hand. |
| Surface Preparation | The surface must be clean, dry, and free from rust or any other foreign matter that would interfere with a good bond. Old patches of roof cement should be removed. |
| Weather Resistance | Plastic roof cement is designed to avoid cracking in cold weather and resist melting in high temperatures. However, it should not be exposed to the sun, as UV rays can cause deterioration within a year. |
| Adhesion | Plastic roof cement adheres to various surfaces, including wood, asphalt, concrete, masonry, metal, and shingles. It can also be used to seal gaps around chimneys, vents, skylights, and gutters. |
| Durability | The cement forms a tight waterproof bond and is durable through all seasons. However, it has a short life expectancy when exposed to UV rays and should be periodically inspected and reapplied to prevent leaks. |
| Storage and Handling | Plastic roof cement should not be frozen, thinned, or heated. It should be stored securely, with the lid tightly closed, at temperatures below 120° F. |
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What You'll Learn
Plastic roof cement application methods
Plastic roof cement is a material that can be applied to a roof to add waterproofing and aid in the application of roofing materials over an existing surface, such as shingles. It can be used with a variety of materials, including concrete and masonry. Before application, the surface must be clean and dry, with any old patches of roof cement removed and rust cleaned from metal surfaces. Concrete, masonry, and other absorbent surfaces may require a coat of primer. This preparation ensures that the cement adheres well and has the ideal surface to bond to.
Plastic roof cement can be purchased in a can, bucket, or caulking cartridge. It is spread onto the roof using a trowel or a knife and can be applied directly from the cartridge with a caulking gun, especially when sealing tears or hard-to-reach areas. When applied with a caulking gun, it should then be smoothed with a putty knife for optimal leak protection and a cleaner finish. The thickness of the application will depend on the size of the problem area, ranging from 1/8" to 1/4" thick.
The cement should be worked into breaks, cracks, or holes, and then applied beyond the problem area, feathering the edges. For larger problem areas, glass fabric can be embedded in the cement for reinforcement, and then covered with additional cement. The application rate will vary depending on the surface, porosity, and job conditions, but a minimum rate of 40 linear feet per gallon with a 4" wide application is recommended.
Plastic roof cement should be applied on a warm day, and it should not be left exposed to the sun. It can be applied between two materials, such as between two shingles, or under a shingle to seal it to the flashing. It can also be covered with a cap flashing, gravel, or aluminium paint to protect it from the sun. Applying a simple layer of aluminium spray paint can significantly increase the life expectancy of a plastic cement patch.
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Preparing the surface for plastic roof cement
To prepare the surface for plastic roof cement application, the surface must be clean and dry. This means removing any old patches of roof cement and cleaning away rust from metal surfaces with a wire brush. The surface should be scraped clean, removing dust and grime. Concrete, masonry, and other absorbent surfaces may need a coat of primer before application. This preparation ensures that the cement has an ideal surface to bond to.
It is important to note that plastic roof cement should not be left exposed to the sun. It should be applied between two materials, such as shingles, or covered with a cap flashing, gravel, or aluminum paint. If using aluminum paint, it is recommended to wait one week for the cement to cure before painting.
Additionally, some plastic roof cements can be applied to wet surfaces. However, it is crucial to work the cement well into the surface, forcing out any water. If water is left between the cement and the surface, it can turn into steam and cause leaks.
For best results in cold weather, it is advised to store the plastic roof cement at room temperature for 24 hours before application. This ensures that the cement is ready to adhere to the surface effectively.
It is worth mentioning that different brands of plastic roof cement may have specific instructions or recommendations for surface preparation. Always refer to the manufacturer's guidelines or instructions provided with the product for the most accurate and up-to-date information.
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Plastic roof cement's weather resistance
Plastic roof cement is designed to avoid cracking in cold weather and to resist melting in high temperatures. However, it can deteriorate over time, and its waterproofing ability weakens. Therefore, it is important to inspect roof joints and seals periodically and reapply cement in areas showing signs of cracking or wear to prevent leaks.
Plastic roof cement should not be left exposed to the sun. It should be applied between two materials, such as shingles, or covered with a layer of aluminium paint, which will increase its life expectancy. Plastic cement has a short life expectancy if exposed to the UV rays of the sun, perhaps less than a year.
The surface to which plastic roof cement is to be applied must be clean and dry. Old patches of roof cement should be removed, and rust should be cleaned from metal surfaces. Concrete, masonry, and other absorbent surfaces may need a coat of primer before application. This surface preparation ensures that the cement has the ideal surface to bond to.
Some products require application to a dry surface, while others can be applied to a wet surface. However, it is important to work the plastic cement well into the surface, forcing the water out. If water is left between the plastic cement and the surface, the sun will turn the water into steam, causing a boil that can eventually leak.
Plastic roof cement is available in a variety of formats, including a caulking cartridge, fluid cans, and a thicker format with fibre reinforcement for better coverage over cracks. It should be applied on a warm day. Once applied, it sets firmly and hardens to a flexible, durable, and watertight film.
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Plastic roof cement's durability
Plastic roof cement is a heavy-bodied asphaltic base roof cement formulated with fillers and fibres to be tough and durable. It is designed to remain soft and pliable, allowing it to expand and contract with changing weather conditions. This flexibility ensures that it can be used on steeply sloped surfaces without running.
The durability of plastic roof cement is evident in its ability to withstand extreme weather conditions. It is designed to avoid cracking in cold weather and to resist melting in high temperatures. However, like most roofing materials, it is not immune to deterioration over time. Exposure to sunlight, in particular, can cause the material to break down, with its waterproofing abilities weakening, and UV rays potentially reducing its life expectancy to less than a year. Therefore, it is recommended to keep plastic roof cement covered or protected from direct sunlight exposure.
To maximise the durability of plastic roof cement, proper surface preparation and application techniques are crucial. The surface must be clean, dry, and free from rust or any foreign matter that could interfere with a strong bond. Old patches of roof cement should be removed, and absorbent surfaces may require a coat of primer. Plastic roof cement can be applied using a trowel, putty knife, caulking gun, or gloved hand, depending on the area being covered.
By following the recommended application methods and maintaining the roof through periodic inspections and repairs, the durability of plastic roof cement can be enhanced. It is important to periodically inspect roof joints and seals, reapplying cement to areas showing signs of cracking or wear. Embedding glass fabric into the cement can also reinforce the repair. With proper care and maintenance, plastic roof cement can provide long-lasting protection against leaks and cracks.
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Plastic roof cement's compatibility with other materials
Plastic roof cement is a material used to add waterproofing to a roof and aid in the application of roofing materials over an existing surface such as shingles. It is also used to repair leaks, cracks, tears, holes, and breaks. It can be used with a variety of materials and surfaces, including concrete, masonry, asphalt, and metal. It is designed to avoid cracking in cold weather and resist melting in high temperatures. However, its waterproofing ability weakens over time due to exposure to extreme weather conditions. Therefore, periodic inspections and reapplication of cement are necessary to prevent leaks.
Plastic roof cement can be used as an adhesive for bituminous base flashings and to seal cracks in exterior walls and foundations. It is also effective in sealing gaps around flashing, vents, skylights, chimneys, and joints along metal edgings and gutters. The surface to which it is applied must be clean and dry, with old patches of roof cement removed and rust cleaned from metal surfaces. Concrete, masonry, and other absorbent surfaces may require a coat of primer before application of plastic roof cement to ensure optimal bonding.
The application methods for plastic roof cement vary depending on the specific product and surface. It can be spread onto the roof using a trowel or putty knife, providing a smooth finish and optimal leak protection. It can also be applied using a caulking gun for sealing tears and hard-to-reach areas. Some products, such as #101 All Weather Plastic Cement, are designed to adhere to all prepared surfaces and exhibit high resilience and durability through all seasons. This particular product can be used on concrete, steel, metal roofs, and flashings around skylights and gutters.
While plastic roof cement is compatible with various materials, specific instructions and precautions must be followed for optimal results. For example, when applying plastic cement to asphalt or asphalt-coated materials, it is essential to use a specially formulated polyurethane adhesive suitable for shingles. Additionally, plastic cement should not be exposed to the sun, as UV rays can significantly reduce its life expectancy. Instead, it should be applied between two materials, such as shingles, or covered with a protective layer like aluminium paint.
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Frequently asked questions
Plastic roof cement is designed to bond to all prepared surfaces, including wood.
The surface must be clean and dry. Old patches of roof cement should be removed and rust should be cleaned from metal surfaces. Concrete, masonry, and other absorbent surfaces may need a coat of primer before application.
Plastic roof cement can be applied using a trowel, putty knife, caulking gun, or gloved hand. It should be applied 1/8" to 1/4" thick and worked into the crack or break, then applied 2"-4" beyond the problem area, feathering the edges.
Yes, aluminum paint will stick to plastic cement if you wait one week for it to cure. Painting plastic cement can extend its life expectancy.
Plastic roof cement should not be exposed to the sun, as UV rays can cause it to deteriorate within a year. It should also not be frozen, thinned, or heated.
