Weather bars
Weather protection rails for wooden windows and doors
Product overview
Weather bars at a glance
BUG offers weather bars – also known as weather protection bars – that are compatible with all standard wooden windows. You can obtain rebate-independent weather bars for modern windows with greater thicknesses, robust thresholds for front doors or you can choose the right rain protection rail from our systems 19, 22 or 25 depending on the rebate area and milling geometry.
Your benefits with window rain protection rails from BUG
With BUG, you can rely on technical expertise and high quality. All rain protection rails from our range offer the following benefits:
- Quick and easy installation thanks to the pine cone connector
- Easy and cost-effective retrofitting possible
- Perfect protection against environmental influences as well as penetrating moisture and wetness
- Profiles with thermal break and improved isothermal flow available
- Controlled drainage of surface water
- Optimum rear ventilation between profile and window or door frame
- Delivery with and without insulating bars
- Extended service life of wooden frames
- Available in press-finish and with anodised surface and in various RAL colours on request
Special weather protection rails with rebate-independent weather bars
Do you want to improve the drainage of water from the rebate area of modern windows and at the same time increase the thermal insulation values? Then we recommend the weather protection bars AP 16.24 and AP 16.23. Both attachment rails are designed for wide cover frames and offer a high level of reliability and tightness. The sophisticated design ensures that surface water and condensation are directed outwards via the cover frame or aluminium rails.
Find out more about the differences between the two rebate-independent weather bars AP 16.23 and AP 16.24.
Benefits of the BUG AP 16.24 rain protection rail
Benefits of the BUG AP 16.23 rain protection rail
Rebate-independent rain protection rails in comparison
| AP 16.23 |
AP 16.23 |
AP 16.24 |
AP 16.24 |
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| Suitable for bevelled rebate milling |
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| Water drainage via the cover profile |
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| Delivered with seal inserted for the drainage slots |
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| Safety thanks to durable, specialised bracket due to two clip-in points |
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| No capillary formation due to the aluminium profile not touching the frame wood |
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| Drainage across the entire sash width without drainage slots |
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| Fully ventilated system |
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| Special edge protection with sealing options |
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| Custom colour options available |
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| Installation can be carried out in compliance with CE standards |
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| For the renovation of listed buildings |
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Weather protection rails for rebate-bound constructions
BUG weather bars are as versatile as the range of milling tools. Systems 19, 22 or 25 are used depending on the rebate depth. Various versions are available within these systems.
Upgrade to thermal weather protection rails
The rebate-dependent weather protection rails of systems 19, 22 or 25 are supplied with or without thermal break. The thermal weather protection bar provides thermal insulation in the area of the lower window rebate. It reduces condensation on the stop bar and freezing of the seal, preventing cold and heat bridges that can lead to mould growth.
Special features and differences of the rebate-bound weather bars
Several versions are available within the various rebate systems (19, 22, 25).
BUG offers the right rain protection rail for every milling geometry. In addition to the milling geometry, the designs also determine whether thermal separation is possible and whether they are suitable for use in listed buildings.
Rebate-bound rain protection rails in comparison
| Rebate system 19 mm | Rebate system 22 mm | Rebate system 25 mm | Thermal separation | Suitable for listed buildings | |
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| RS-rail GTR 19.45 |
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| RS-rail GTR 19.45 K |
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| RS-rail GTR 22.44 |
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| RS-rail GTR 22.44 K |
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| RS-rail GTR 25.46 |
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| RS-rail GTR 25.46 K |
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| RS-rail KP 5041 W |
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| RS-rail KP 5053 W |
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| RS-rail KP 5081 W |
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| RS-rail RD 19.45 K |
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| RS-rail RD 22 K Stil |
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| RS-rail RD 22.44 K |
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| RS-rail RDN 22 K Stil |
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| RS-rail TR 12.19 Stil |
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| RS-rail TR 12.22 Stil |
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| RS-rail TR 12.22 K Stil |
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| RS-rail TR 12.25 Stil |
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| RS-rail TR 12.25 K Stil |
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| RS-rail TRDN 25 K Stil |
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| RS-rail TRDN 25.48 K |
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FAQ: The most frequently asked questions about weather bars
Find out more about how weather bars work and how to maintain them in our FAQs. You can also find out about weather protection systems as a whole, thresholds, sash covering profiles and other accessories for weather protection rails on wooden windows.
Weather bars, also known as weather protection bars, are used on wooden windows to protect the lower crossbars, which are particularly exposed to the weather. If you want total protection, choose wood-aluminium window systems.
To find the right rain protection for your windows and doors, you need to know which rebate system is installed and the thickness of the window. If you need help with this, please contact us using the contact form.
Both weather bars are designed for rebate milling. However, the design differs in that the AP bar 16.23 is supplied with a retracted seal and the water is drained exclusively via the cover profile. The AP bar 16.24 does not rest directly on the wooden frame. A small proportion of the water is therefore drained away via the wooden frame.
To install the weather protection bars AP 16.23 and AP 16.24 from BUG, the brackets must first be screwed to the frame wood. Then simply clip the bar to the window frame.
BUG also supplies the right end caps to match the rain protection rail (required for rebate-dependent constructions) and, of course, the clip holder with which the AP bar is attached to the wooden frame.
Clean the weather protection bars once a year. Check for rust and other damage and ensure that the weatherboards are securely attached to the window. Replace damaged parts immediately to prevent further damage to the building.
Check your weather protection rails once a year. The lower window frames are often not fully protected from UV rays, wind, and other weather conditions. As older weather protection rails, cover profiles, or thresholds do not cover the entire wood, it is important to inspect wooden frames regularly and retrofit modern weather bars where necessary.
Weather protection rails on your old wooden windows and doors can be repaired and renovated in just a few simple steps. Remove the old aluminium rails and replace them with new, wide rails. Retrofitting aluminium weather protection systems from BUG is easy and cost-effective. The profiles are available with thermal break to prevent cold and thermal bridges. In consultation with your specialist company, you will find the right solution for many designs in the extensive BUG product range.
Comprehensive protection for windows with weather protection rails from BUG
Weather bars are an essential part of building integrity and protection. They play a vital role in protecting wooden windows from water damage, contributing to the longevity of the building. Looking for expertise and technical know-how? Then BUG is the place for you. We build reliable and long-lasting solutions. Please contact us if you have any questions. Our team is happy to help you ensure that your building is equipped with the right weather bars.
