Regarding the leak issue in the sunroom
Release date:
2025-09-01
It’s best to leave a 3-5mm gap between the doors/windows and the frame—this allows the sealant to properly bond into the缝隙, creating a stronger structure and enhancing its waterproof performance. If no gap is left, the sealant will remain only on the surface, and over time, it’ll naturally start to peel off.
One of the reasons for skylight leaks is the insufficient strength of the frame structure. Unlike doors and windows, a skylight is entirely supported by its robust frame system. If the frame isn’t sturdy enough, it can significantly shorten the lifespan of the skylight. Typically, the roof of a skylight consists almost entirely of glass panels, placing immense stress on the overall frame. When the frame lacks structural integrity, even under the weight of the glass itself, it may undergo slight deformation. This deformation, in turn, puts subtle pressure on the waterproof sealants—such as silicone—used at the points where the skylight connects to the walls. Over time, these seals can gradually pull apart, leading to cracks that allow water to seep in.
What makes this issue particularly tricky is that the frame’s deformation often causes microscopic cracks in the sealant, which are nearly invisible to the naked eye. As a result, leaks may go unnoticed despite repeated repairs—and over time, this can create hidden risks that compromise the skylight’s long-term durability.
That’s precisely why many customers find their skylights leaking shortly after installation during rainstorms, only to discover that no matter how many times they try fixing it, the problem persists. In fact, if left unaddressed, these underlying issues could eventually lead to more serious damage down the line.
To avoid such headaches, we strongly advise our customers not to prioritize cost-cutting at the expense of quality. Investing a bit more upfront in high-grade frame materials will ensure your skylight remains watertight and reliable for years to come.
2. The junction between the sunroom and the wall is a critical area for leaks.
Once the sunroom frame is completed, if there are any areas where it connects to the existing walls, be sure to carefully remove the original wall paint. This ensures that the adhesive bonds securely to the wall—otherwise, over time, as the adhesive dries and shrinks, it could pull away the wall paint, leading to leaks. In fact, this is one of the most common causes of water seepage in sunrooms. Ideally, after applying the sealant, you should also create a groove in the wall above the covering material and install a rain shield, providing an extra layer of protection to prevent even the slightest chance of leakage.
It’s best to leave a 3-5mm gap between the doors/windows and the frame—this allows the sealant to properly bond into the缝隙, creating a stronger structure and improving its waterproof performance. If no gap is left, the sealant will remain only on the surface, and over time, it’ll naturally start to peel off.
3. The top panels, doors and windows, as well as the frames, are also key areas where leaks occur in sunrooms.
Sunroom adhesive plays a crucial role in ensuring waterproofing. At the seams between the top panels of the sunroom, as well as at the joints where walls, doors, and windows meet their frames, structural and weather-resistant silicone adhesives are essential for creating durable, water-tight seals. Unfortunately, low-quality adhesives offer poor waterproof performance—they simply can’t withstand prolonged exposure to rain or sunlight. Over time, this leads to aging and degradation, ultimately causing leaks in the sunroom.
When it comes to selecting adhesives for sunrooms, there’s actually quite a bit to consider. Typically, the roof area uses a combination of structural and weather-resistant adhesives. Here’s how it’s done: First, apply a generous bead of structural adhesive into the gaps between roofing materials—making sure the adhesive fills about two-thirds of the space. Then, carefully layer on a thin coat of weather-resistant silicone. The reason behind this approach is simple: structural adhesives provide exceptional bonding strength, securely locking the frame to the roofing material. Meanwhile, weather-resistant silicone excels in resisting oxidation and corrosion, making it perfectly suited to endure both rainwater exposure and intense sunlight.
Finally, it’s important to avoid using standard window and door silicone sealants for roof waterproofing—these are not designed for the specific demands of sunroom applications.
4. Pay attention to details and ensure the finishing touches are done right.
Water is relentless—no corner is safe from its reach, so don’t rush the finishing touches. The final steps for the sunroom are crucial. Be sure not to skip applying sealant between doors, windows, and their frames—every joint in the door and window profiles, as well as any gaps between the frames, could potentially let rain seep in.
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Contact Address: No. 7, Industrial Avenue East, Songxia Industrial Park, Shishan Town, Nanhai District, Foshan City
Warren Doors and Windows, south of Fangshan Road and west of Dongtai Road, Dongcheng Subdistrict, Linqu County, Weifang City, Shandong Province
Become A Deaters :Info@wolunmc.com
National customer service hotline:+86 400-676-9888
WhatsApp:+86-18866798677
Beijing customer service phone number:+86 010-68319888
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