Standard roof duct penetration


It is work that takes place after the roofers are gone that can create some real problems. In this example, a well-designed steel sleeper curb is compromised by an unsealed bolt penetrating the top of the waterproof sheet metal cap. Coordination between the installing contractor and roofing contractor, combined with properly designed roof attachments, can result in completely water tight roof penetrations that require no maintenance. A satellite dish is mounted using concrete blocks as ballast. Roof penetrations are a good thing if you follow these two rules. Since the washer is completely contained within the undercut, and the outside edges of the bolt head are in contact with Base Cap, the washer cannot be over compressed and is never exposed to the environment or UV light. It is obvious for objects like equipment screen walls, signs and large HVAC units to be mechanically attached to the roof structure, but it is also very common for smaller equipment and other roof accessories to be placed directly on the roof, or to be held down with ballast.
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Technical Articles

Our standard roof attachment system shown to the right employs a heavy steel cap which counter-flashes over the base flashing 2. A pitch pocket, typically fabricated out of sheet metal, is a flanged sleeve flashed into the roofing system creating a dam to retain sealant which is poured into the pitch pocket. Using an inferior method of mounting equipment to avoid roof penetrations may solve the waterproofing concern, at least for the short term. In fact it could be argued that undetected leaks can be more damaging. Before any work takes place, all proposed roof penetration details should be submitted to the manufacturer for approval. Since the washer is completely contained within the undercut, and the outside edges of the bolt head are in contact with Base Cap, the washer cannot be over compressed and is never exposed to the environment or UV light. The preferred method to seal a roof penetration is to use a counter-flashing to extend over the outside of the base flashing.
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But roofers are not miracle workers. A secondary flashing made of metal or neoprene rubber, commonly called storm collar, should be installed above the band and caulking to help shed water to the outside and protect the caulking from weather and UV light. The preferred method to seal a roof penetration is to use a counter-flashing to extend over the outside of the base flashing. Our standard roof attachment system shown to the right employs a heavy steel cap which counter-flashes over the base flashing 2. So any roof work deserves proper due diligence and attention to detail to ensure that its integrity is not compromised. When adding any type of equipment to a rooftop, primary concerns are safety, waterproofing and preserving the service life of the roofing. Since the washer is completely contained within the undercut, and the outside edges of the bolt head are in contact with Base Cap, the washer cannot be over compressed and is never exposed to the environment or UV light. We'd love to answer any questions you might have about our products. Caulking is applied around the top of the flashing above the clamp. Have a qualified licensed roofing contractor do the roofing portion of the work.
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Description:To make matters worse, these solutions can also pose significant safety risks. Adding a cover, like a neoprene or lead umbrella, over the pitch pan to protect it from weather and UV light can help extend its life significantly. Caulking is applied around the top of the flashing above the clamp. Leak problems occur when non-qualified contractors penetrate the roof with improperly designed attachments. A well designed roof support with a sealed cap can be installed on a roof and be completely watertight when that contractor leaves the roof. Modern roofing practices employ various types of chemical sealants in pitch pockets, and often include grout fillers with the sealant poured in as a top layer. The most common solution is to let equipment sit on the roof held down by its own weight, or add ballast like concrete blocks to hold it down.

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