Mamad Window Repair & Replacement — Step-by-Step Guide

What Is a Mamad Hermetic Window?

The mamad window is not a regular window. It is a hermetic unit manufactured according to Israeli Standard 4910 and consists of a steel frame, a steel shrapnel shutter, and tempered glass. Its purpose is to allow everyday ventilation while providing full protection during emergencies — against shrapnel, blast waves, and chemical agents.

A functioning mamad window is a critical component of the safe room’s seal. A damaged, broken, or improperly closing window cancels the protection of the entire mamad.

Common Mamad Window Problems

Shutter That Won’t Close Fully

The most common cause is dirty tracks or rust on the pivot. The shutter must close completely and lock to withstand blast wave pressure.

Broken or Loose Handle

The window handle enables hermetic closure. A broken handle prevents a full seal. Handle replacement alone costs 150-300 NIS.

Deteriorating Rubber Seal

The window rubber seal dries out over the years, especially on the sun-facing side. When it cracks, air penetrates and there is no seal.

Cracked or Broken Glass

Tempered glass that has cracked must be replaced immediately. Damaged glass provides no shrapnel protection.

Rusted Shutter

Rust on the steel shutter weakens its resistance. Surface rust can be treated; deep rust requires replacement.

Step-by-Step Repair Guide

Step 1: Diagnose the Problem

Inspect the window in both open and closed positions:

1. Close the shutter — does it reach the end? Does the lock engage?
2. Close the glass pane — does the handle turn all the way?
3. Check the rubber seal — press it. Is it flexible or hard and brittle?
4. Darken the room and check if light enters through the window when closed.

Step 2: Clean Tracks and Lubricate

1. Clean the tracks with a stiff brush and vacuum cleaner.
2. Remove dust, sand, and debris from the upper and lower tracks.
3. Apply silicone lubricant to the tracks and shutter pivot.
4. Operate the shutter several times to distribute the lubricant.

Step 3: Replace the Rubber Seal (DIY)

1. Gently remove the old rubber seal using a utility knife or putty knife.
2. Clean the channel of all rubber residue and dirt.
3. Measure the required length and add 2 cm.
4. Install the new seal — start from the top corner and press into the channel.
5. Cut the excess and make sure there are no gaps.
6. Close the window and test the seal.

Material cost: 50-150 NIS for a compatible rubber seal.

Step 4: Repair or Replace the Handle

1. Remove the screw cover plate at the base of the handle.
2. Unscrew the two screws with a Phillips screwdriver.
3. Remove the old handle.
4. Install a new compatible handle — make sure it is the correct type for a mamad window.
5. Tighten the screws and verify the mechanism seals the window hermetically.

Cost: 150-300 NIS for a handle.

Step 5: Treat Rust on the Shutter

1. Sand the rusted area with coarse sandpaper (80 grit) then fine (220 grit).
2. Clean sanding dust from the area.
3. Apply a coat of rust-inhibiting primer.
4. After drying, apply two coats of durable metal paint.

Cost: 80-200 NIS for materials.

When to DIY vs. When to Call a Professional

Task	DIY?	Notes
Track cleaning and lubrication	Yes	Basic maintenance
Rubber seal replacement	Yes	Requires precision
Handle replacement	Yes	Relatively easy
Sanding and painting light rust	Yes	Materials available at hardware stores
Glass replacement	No	Requires a certified professional
Steel shutter replacement	No	Must be installed per IS 4910
Full window replacement	No	Must comply with standards — certified contractor only
Steel frame repair	No	Requires professional welding

Price Guide 2026

Work	Estimated Price
Rubber seal replacement	200-400 NIS
Handle replacement	150-300 NIS
Shutter repair (adjustment + lubrication)	300-600 NIS
Shutter rust treatment	400-800 NIS
Tempered glass replacement	800-1,500 NIS
Steel shutter replacement	2,000-3,500 NIS
Full mamad window replacement	4,000-7,000 NIS

Note: Full window replacement includes measurement, manufacturing, and installation. Lead time: 2-4 weeks.

Important Tips

• Israeli Standard 4910 requires the mamad window to include a steel shutter, tempered glass, and a locking mechanism. Never install a window that does not meet the standard.
• According to Home Front Command guidelines, the mamad window must be inspected at least once a year.
• If the window does not close hermetically, the mamad provides no chemical/biological protection.
• In coastal cities, treat shutter rust annually.
• Never remove the steel shutter for “better light” — it is a critical protective component.

FAQ

Can I install a regular window in a mamad? No. A mamad window must comply with Israeli Standard 4910. A regular window provides no shrapnel protection and cannot achieve a hermetic seal.

How often should the rubber seal be replaced? Every 5-7 years, or immediately upon noticing signs of wear such as cracks, hardening, or crumbling.

What should I do if the shutter is stuck? Try lubricating the tracks with silicone spray. If that does not help, call a professional. Never use excessive force on the shutter, as it may bend and become permanently damaged.