Common Causes of Window and Door Leaks

Common Causes of Window and Door Leaks

Possible Causes of Window and Door Leaks

Problems with Installation

Some installation issues that can cause window leaks and door leaks include:
  • Unsupported Sills: The most common cause of installation leaks in sliding doors and windows are unsupported sills. This is difficult to repair once the flooring has been installed and a service technician must assess on a case-by-case basis. Unsupported sills can also lead to separation of mullion blocks and create an entry point for water.
  • Covered Weep Holes: When flooring is installed above weep holes, water will gather in sills and tracks and the water will be unable to drain away.
  • Aftermarket Security Screens: If non-Jason security products have been installed on your Jason frames it is possible they are compromising the drainage system. Some aftermarket security screens don’t take the drainage system into account and block the water from draining out.


Complex window and door designs

Some design factors that can cause window leaks and door leaks include:

  • Angled fascia board: A type of fascia board that is installed on an angled roof. Angled fascia boards above windows need to be angled outward to direct water away from the window.
  • Complex window designs: Due to the increased number of joints and seams that are required to construct them, complex window designs need to be considered as potential leak points. The orientation of the house can also be troublesome due to varying factors such as wind direction, sun exposure, and the slope of the roof.
  • Lack of overhangs: Overhangs drain water off the roof and protect wind-driven rainwater from entering through the windows, so a lack of overhangs may be an issue.


Environmental factors

Some window and door leaks can be caused by environmental factors, such as:

  • Changing weather patterns: Modern windows and doors are designed to suit our current weather conditions, while older windows from 10, 20, 30 or more years ago were made for the known weather conditions of their time. Stronger weather patterns are becoming a reality, and older windows and doors are just not designed for the increasing strength in weather. Sometimes our service technicians are able to reseal windows and doors making them water and airtight, but if windows are unable to be resealed or modified they will need to be replaced with a higher rated product for today’s weather conditions.
  • Storms and extreme weather conditions: The combination of extreme winds and high rainfall to exposed windows and doors can exceed the product’s drainage system. Water can be forced in through the drainage holes (sometimes in spitting form) and sit in sills and tracks. When this occurs the volume of water coming in exceeds the volume of water going out. These sills and tracks are designed to hold the water and then drain/evaporate away.

If you have exposed windows or doors and are in an area that experiences storms and extreme weather conditions often, consider maintaining your tracks and sills more often than the recommended period to keep drainage holes free of debris, or get in touch to request a service technician to attend and assess whether any product modifications can be made to improve drainage.

Insufficient cleaning and maintenance

It’s important to regularly clean your door and window tracks to prevent dirt and debris buildup. If left unattended, this dirt can block the weep holes in the tracks, causing water to overflow into your house and potentially lead to costly water damage. 

Regular maintenance also helps you spot minor issues before they become a big problem. It also helps prolong the life of other moving parts, such as the rollers.
​

Window or door leak diagnostic tool

If you are concerned you have a leaky window or door, please run through our diagnostic tool to help diagnose the cause of concern:



    • Related Articles

    • How to Fit Weather Baffle to Sliding Window

      The window baffle is designed to help seal the window from rain, noise and wind. The window battle can wear over time from general use and will need replacing. This video shows how to fit a weather baffle to a Jason Sliding Window. The weather baffle ...

    • How to Clean your Window & Door Frames

      Aluminium requires minimal maintenance but, like your motor vehicle, its finish may deteriorate if foreign materials collect and are allowed to remain on the surface for a period of time. This is because such foreign material absorbs atmospheric ...

    • Changing Residential Sliding Door Rollers

      This video demonstrates how to change rollers on Jason Windows Residential Sliding Doors purchased from 2010 onwards. Spare Parts Sliding Door Roller ROL35 is available for purchase direct from the Jason Windows Spare Parts Shop. One per pack.

    • Check Sliding Door Keepers are Secure

      If you have a Jason Boltlock Sliding Door from 2000 - 2009, check the keepers are secured into your door frame properley. Insecure keepers can cause your boltlock snibs to fail pre-maturely. Keepers are located in the top and bottom of the frame and ...

    • How to Replace Barrel on a Benchmark Hinged Door

      How to replace the barrel on your Jason benchmark hinged door. The euro lazy cap barrel suits the benchmark hinged door and can be purchased from Jason Spare Parts Shop.