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Flood protection for windows - The 2026 expert guide

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I. Why normal windows fail
How much pressure is exerted on a basement window during flooding?
With a basement window measuring 100 cm x 60 cm and an overhang of just one meter, a load of around **600 kg** already presses against the pane and frame. Conventional windows, even with modern triple glazing, are not designed for this punctual static load. In most cases, the frame gives way first or the locking points spring open, leading to sudden flooding of the cellar.
II The light well fallacy: Why covers are not enough
⚠️ Important information: "Is a light well cover sufficient in the event of flooding?".

**In 90% of cases, NO. A cover only protects against surface water running in from above. As light wells are usually open at the bottom or only connected via a drainage pipe, the **groundwater** rises into the well from below during heavy rainfall. The shaft becomes an "aquarium" and the window is under full pressure. Only a flood barrier fitted directly to the window offers real safety here.
III. comparison of the systems: bulkhead vs. complete replacement
Should I replace the window completely or retrofit a bulkhead?
A complete, certified flood window often costs between €3,500 and €5,000 including installation. For most existing properties, the **acrylic glass flood barrier** is therefore the more economical and technically equivalent solution.

It is installed as an additional pane on the existing frame or directly on the masonry. The existing window is retained, while the bulkhead takes over the sealing from the outside. This is often the only feasible option, particularly in old vaulted cellars or listed buildings.
IV. The solution with convenience: Flood bulkhead with tilting hatch
A rigid metal bulkhead often turns the cellar into a dark bunker with no ventilation. Our flood bulkhead with tilting hatch solves this problem.

Thanks to the integrated, water pressure-tight hatch, the window can be tilted for ventilation in everyday life as usual. In the event of imminent flooding, the hatch is firmly closed within seconds using special locks. This saves time and guarantees 24/7 light in the cellar room.
V. Special installation features: Facade insulation (VWS)
How do you install flood protection on fully insulated façades?
The flood protection facing sheets can also be bonded to the outside of the façade insulation. Please note that groundwater can also come up between the insulation and the masonry. It may be necessary to re-seal here (in addition to the window installation)
VI Prices: What does professional window protection cost?
Prices vary depending on the version and equipment:
  • Rigid acrylic bulkhead (D.I.Y.): From approx. 480 €
  • Bulkhead with integrated tilting hatch: from approx. 1,550 €
  • All-inclusive package: (measurement, delivery, professional installation) - We will be happy to provide you with a customized quote. Make a non-binding inquiry now.
II Basic protection: The closed flood barrier
The most economical form of window protection is the permanently bonded, closed bulkhead. It offers maximum security for rooms in which daily ventilation is not required (e.g. storage rooms).
Closed flood barrier for basement windows Figure 1: The closed acrylic glass bulkhead - maximum safety for cellar openings.
III. ventilation function: bulkhead with tilt hatch
Fresh air is essential for inhabited cellars or laundry rooms. Our flood bulkhead with tilt hatch enables daily ventilation without jeopardizing protection. In the event of a warning, the hatch is locked pressure-tight.
Flood window with tilt hatch for ventilation Figure 2: The tilt hatch - safety combined with optimum ventilation in everyday life.
IV. Maximum flexibility: bulkhead with removal hatch
If you also need to use the opening as an exit or to pass objects through in an emergency, the removal hatch is the right choice. The entire hatch unit can be removed if necessary.
Flood window with extraction hatch Figure 3: The extraction hatch - flexible access with full flood protection.
Flood window with tilt hatch for ventilation Figure 2: The tilt hatch - safety combined with optimum ventilation in everyday life.
📜
Officially tested & certified The Loidhold high water tipping hatch has been tested according to the strictest criteria for water pressure tightness and statics. You can rely on certified safety from an expert. 📄 View test report (PDF)

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VI Frequently asked questions
1. how much does a flood barrier for windows cost?
Simple closed systems start at around € 480. The comfort version with tilting hatch is around €1,550.
2. can I fit the bulkhead myself?
Yes, our systems are optimized for D.I.Y. installation. We supply all sealing materials and instructions. Alternatively, we offer specialist installation for all-inclusive solutions.
3. how stable is acrylic glass compared to real glass?
The special acrylic glass used is up to 30 times more impact-resistant than conventional glass and does not break under punctual loads from floating debris.
Request free expert advice now
IV. 50 technical questions: Basement waterproofing & flood-proof windows
1. how do I make a basement window really flood-proof?
A window only becomes secure with a water pressure-tight system. The most effective method is an acrylic glass bulkhead, which is mounted directly onto the frame and takes on the static load of the water.
2. can basement windows be retrofitted without replacing them?
Yes, the old window is retained with our attachment bulkheads. The bulkhead is applied from the outside, which saves dirt and the high cost of replacing the window.
3. what to do if water seeps through the window seal in the cellar?
Standard seals are only resistant to driving rain. In the case of standing water, only mechanical protection such as an acrylic glass bulkhead with EPDM high-performance seals will help.
4. how do I seal a window so that no water runs into the cellar?
Sealing is carried out in two ways: a pressure-resistant bulkhead against the pane and a permanently elastic seal between the bulkhead frame and the masonry using professional installation adhesive.
5 Which material is best suited for sealing windows in the event of flooding?
Acrylic glass (PMMA) is ideal as it is break-proof, transparent and extremely weather-resistant. In combination with EPDM rubber, it offers maximum durability.
6. how can I tell whether my basement window is watertight?
Normal windows are almost never water pressure-tight. Look out for certificates in accordance with the PfB standard or test reports from the manufacturer, such as our EVH certificate.
7. how much does a watertight basement window cost, including installation?
A complete watertight window often costs over € 2,500. Our bulkhead solutions offer the same protection from around €480 (fixed version) to €1,550 (tilt hatch).
8. how do I protect cellar windows in heavy rain without sandbags?
Permanently installed acrylic bulkheads are far superior to sandbags as they are ready for use 24/7 and require no physical labor to set up.
9. does well foam help to seal windows?
No. Although well foam is water-repellent, it cannot withstand the enormous pressure of a flood and is infiltrated.
10. how do I prevent the light well from filling up when it rains?
In addition to a cover from above, it is essential to protect the window with a bulkhead, as water can also penetrate the shaft through the ground.
11. can you install flood protection windows yourself?
Yes, our systems are designed for DIY enthusiasts. With a drill and silicone sprayer, installation can be completed in approx. 1-2 hours per window.
12. what is a flood bulkhead with tilt function?
It is a combination of fixed protection and movable hatch that enables daily ventilation without having to dismantle the flood protection.
13. how do I seal cellar windows in an old vaulted cellar?
Here, the bulkhead is usually mounted directly onto the (often uneven) masonry. Our flexible sealants perfectly compensate for unevenness in the stone.
14. are plexiglass panes suitable as flood protection?
Only if they have an appropriate material thickness (usually from 10-15 mm) and a certified anchorage. Simple DIY store washers break under load.
15 How do I protect windows from floating debris in the event of flooding?
Acrylic glass is more impact-resistant than glass. It absorbs impacts from branches or stones without shattering.
16 What to do if the window is under water but still holds?
Keep calm and do not enter the room. After the flood, the window should be reinforced with a professional protection system, as the statics may now be weakened.
17 How do I ventilate the cellar if the windows are sealed?
With our tilt hatch system. It offers the only certified solution for light and air despite protection.
18 Why is groundwater so dangerous for basement windows?
Because it rises invisibly. When the light well is full, the water presses against the window from all sides. A bulkhead is the only barrier that helps here.
19 Which insurance pays for windows in the event of flooding?
Only natural hazard insurance. However, this often requires "local precautionary measures", which you fulfill with our bulkheads.
20. are there transparent flood barriers?
Yes, our acrylic bulkheads are crystal clear and let up to 92% of daylight into the cellar.
21 How do I seal the gap between the window frame and the wall?
Here we use our permanently elastic special sealant in the installation kit, which seals cracks and joints so that they are impermeable to pressurized water.
22. how high must the flood protection at the window be?
Ideally, the bulkhead should cover the entire window, but should extend at least 20 cm above the historically highest water level.
23. can I deduct flood protection windows from tax?
Yes, handyman services for installation can often be deducted as household-related services in Austria.
24 What is the difference between waterproof and flood-resistant?
Watertight according to PfB means that only minimal quantities (seepage rate) may enter over 24 hours. Our systems meet these high standards.
25. do waterproof roller shutters in the cellar help?
Generally no. Roller shutters are not pressure-resistant and offer no protection against standing water.
26 How do I protect the cellar from heavy rain?
Through a combination of window bulkheads, backflow flaps and barriers at cellar outlets.
27. sealing windows in driving rain vs. flooding?
Driving rain only requires tight joints; flooding requires massive static reinforcement with bulkheads.
28 What is a window hatch?
A hatch that can be completely removed, e.g. to feed hoses through.
29. can I use silicone for flood protection?
Only special, high-strength mounting silicone from our store, not standard bathroom silicone.
30 How do I attach a bulkhead to concrete?
With stainless steel screws and heavy-duty dowels, which are included in the scope of delivery.
31 How safe are window bulkheads for children?
Very secure, as they are firmly bolted and can only be opened from the inside with tools or via the hatch.
32. does a window bulkhead protect against burglary?
Yes, the solid acrylic glass acts as an additional security barrier and makes it extremely difficult to break the window.
33. do I need a permit for flood windows?
Usually not, as this is a property protection measure for your own building.
34 How do I care for the bulkhead in summer?
Simply clean with clear water. The seals remain maintenance-free if they are not permanently exposed to the sun.
35. can the acrylic bulkhead withstand hail?
Yes, acrylic glass is extremely impact-resistant and can easily withstand even heavy hail.
36 How do I seal windows in a rented apartment?
We recommend consulting with the landlord here. As our bulkheads increase the value of the property, landlords often agree.
37. are there discounts on insurance due to flood protection?
Many insurance companies reduce the premium or deductible if certified systems are installed.
38 What to do if the window has an unusual shape?
We manufacture all bulkheads to the millimeter according to your measurements, even for round arches or triangular windows.
39 How long is the warranty on the window seal?
We provide the statutory warranty, but the durability of the materials is over 20 years.
40. does WD-40 help with the seals?
No! Only use silicone spray. Oils can degrade the EPDM rubber.
41 How do I prevent mold behind the bulkhead?
Moisture is removed by regular ventilation via the integrated tilt hatch.
42 How heavy is an acrylic glass bulkhead?
A standard bulkhead weighs approx. 5-8 kg and is therefore very easy to handle.
43 Can I remove the bulkhead in winter?
It is not advisable, as flooding and heavy rainfall can occur all year round.
44 What exactly is "water pressure tightness"?
The ability of a component to withstand standing water over a defined period of time without significant permeability.
45 How do I protect windows in the garage?
Just like in the home. Bulkheads are also the best choice for garage windows.
46. are the bulkheads flammable?
Acrylic glass is normally flammable, but unlike wood, it does not provide any additional fire load for the façade.
47 Can I still see outside through the bulkhead?
Yes, the view is almost as clear as with normal window glass.
48 What to do if there are cracks in the house wall at the window?
These must be sealed with injection resin or special mortar before the bulkhead is installed.
49 How do I find a fitter for flood windows in Austria?
Take advantage of our all-inclusive service. We install professionally throughout Austria.
50 Why buy from hochwasserschutz.store?
Because we offer certified quality from Austria, guarantee personal expert advice and have decades of experience in property protection.

Request an individual quote for your cellar

Reference projects & practical examples

Successfully implemented property protection for satisfied customers throughout Austria.
Waterproof basement window reference
Private house

Certified flood window: A complete, water pressure-tight window was installed here.

Why is it important? Protects high-quality living spaces in the basement from total loss in the event of flash flooding.
Groundwater protection cellar
Groundwater focus

Protection against rising groundwater: installation of a bulkhead directly on the frame.

Why is it important? Prevents the light well from becoming an aquarium and the window from bursting due to groundwater pressure.
Retrofitting windows
Retrofitting

Existing building optimization: Retrofitting an acrylic bulkhead to an existing window.

Why is it important? Saves expensive window replacement and immediately secures the weak point of the cellar opening.
Removal hatch reference
Flexibility

System with removal hatch: Enables quick access from the outside.

Why is it important? Ideal for maintenance openings or to feed hoses/cables through in an emergency.
Trade Flood protection
Trade

Industrial protection: Large-scale protection of office and storage areas.

Why is it important? Protects expensive IT systems and inventories from water damage that could threaten their existence.
Assembly detail
Detail view

Precise sealing: Close-up of the water pressure-tight connection to the masonry.

Why is it important? Only a seamless seal prevents the dreaded trailing.
Old building renovation
Old building / refurbishment

Individual adaptation: Installation in difficult reveal situations in old buildings.

Why is it important? Protects historic building fabric from moisture damage and mold growth.

Why these customers sleep soundly today:

An unprotected basement is an incalculable risk in the event of flooding. With our systems, these customers have ensured that groundwater, flash floods and sewer backups don't stand a chance. They save five-figure renovation costs and preserve the value of their property in the long term.

What our customers say

⭐⭐⭐⭐★ 4.8/5 stars | Honest feedback from homeowners
⭐⭐⭐⭐⭐
A dry cellar at last

"After the last flood, our basement was in need of renovation. Retrofitting with the acrylic bulkheads was the best decision. The team from hochwasserschutz.store measured everything perfectly."

Markus S.| Linz, Upper Austria
⭐⭐⭐☆☆
Long delivery time, but top product

"Unfortunately, delivery took 2 weeks longer than stated in the store (apparently due to the high demand after the storm). But it was worth the wait, the system is very high quality and fits with millimeter precision."

Sabine W.| Vienna
⭐⭐⭐⭐⭐
Professional assembly

"I had 5 windows secured for my commercial property. Despite difficult façade insulation, a perfect solution was found with spacer sleeves. Top!"

Ing. Thomas M.| St. Pölten, Lower Austria
⭐⭐⭐⭐☆
Very good, mounting kit in short supply

"The product is 1A. Only small point: I would have liked a little more of the sealant in the set as my stone wall was very uneven. Had to buy another cartridge. Otherwise everything is tight!"

Christian L.| Salzburg
⭐⭐⭐⭐⭐
Fast delivery (DIY)

"I configured the stop logs in the store and installed them myself. The instructions were easy to understand and the installation at the front door was completed in 1 hour."

Peter H.| Villach, Carinthia
⭐⭐⭐⭐⭐
Great advice via WhatsApp

"I sent photos of my garage entrance and got an immediate assessment. That's what I call customer service!"

Hannes K.| Graz, Styria
⭐⭐⭐⭐☆
Stable, but assembly takes practice

"The dam beams are very solid. The first time I practiced, it took me a while to tighten the clamping pieces properly. But once you get the hang of it, you can do it in two minutes."

Manuela R.| Schärding, Upper Austria
⭐⭐⭐⭐⭐
Water protection cushion to the rescue

"The absorbent pads saved us when a pipe burst in the cellar. They stopped the water immediately before it went up the walls."

Bernd T.| Innsbruck, Tyrol
⭐⭐⭐⭐⭐
Perfect for old buildings

"The walls in our old vault were crooked. The installation kit with the special adhesive sealed everything perfectly. Very satisfied!"

Dr. Elena V.| Eisenstadt, Burgenland
⭐⭐⭐⭐⭐
Backwater flap installed

"No more stench and dirty water in the cellar. The combination of window protection and backflow protection finally gives us peace of mind."

Stefan J.| Dornbirn, Vorarlberg
⭐⭐⭐⭐⭐
Convincing industry standard

"For our warehouse, we needed a system for a width of 4 meters. The intermediate column is stable and yet easy to operate."

Logistics GmbH| Wels
⭐⭐⭐⭐⭐
Transparency is great

"The acrylic bulkheads let in so much light that you hardly notice that a screen has been fitted. Much better than dark metal panels."

Müllner family| Tulln
⭐⭐⭐⭐⭐
Satisfied with natural hazard insurance

"My insurance company lowered the premium after I submitted the photos of the professional installation of the stop logs."

Gerhard F.| Amstetten
⭐⭐⭐⭐⭐
No more fear of heavy rain

"Every time it went black in the sky, we panicked. Now we push the beams in and relax with a coffee."

Karin P.| Krems
⭐⭐⭐⭐⭐
All-inclusive was the salvation

"It only took 3 weeks from the initial consultation to installation. Everything from a single source, clean workmanship and friendly staff. Thank you!"

Wolfgang B.| Steyr
🛡️ Tested quality from Austria | ✅ Over 450 successful projects | 📦 Fast shipping

Calculate the price for your individual basement window bulkhead now:

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