Parapet Walls – Purpose, Types, Consideration, Repair And Maintenance - LCETED

Parapet Walls – Purpose, Types And Repair And Maintenance

What Does Parapet Wall Mean? - Parapet Definition

If a short-height (3ft-4ft) wall is built on the edge of the roof, balcony and terrace of the house, it is known as a parapet wall. It is also built on bridges and sidewalks.

Various materials such as brick masonry, steel, RCC (reinforced cement concrete), aluminium, glass are used for parapet wall construction. It gives our home an attractive look.

It helps to improve the appearance of the house and also acts as a safety barrier for the occupants.

A parapet wall is a low-security structural layer built near the roof. this wall provides continuity and support in terms of water, air, steam and thermal control.

Control of these factors can help prevent degradation and corrosion of the roof or some other pre-built adjacent structure.

 

What are the uses of Parapet Walls? – Purpose

The terrace of the house is used by the occupants for sitting, relaxing, browsing and many other recreational activities. Therefore, the safety of the residents provided with the parapet should be ensured. A parapet wall serves the following purposes.

a)  Giving an aesthetic look to the structure.

b) Provide protection to prevent vehicles from falling off the bridge on bridges, even when humans are on the rooftop.

c)  Prevent dust from entering the air through the roof.

d) To prevent concealment of equipment and machinery on the roof.

e)  To prevent debris collected on the roof from falling.

f)   Perforated walls will be useful for security operations in military areas.

g) To prevent excessive wind loads from coming on the roof

 

Height of Parapet Wall

The height of the parapet wall is an important factor to consider in constructing the wall.

 

The minimum thickness of a parapet wall is 4 ½ ”inches. 9” recommended

 

The standard minimum height of the parapet wall should be 3 feet – 900mm.

 

The parapet wall should not be built less than 3 feet. At this height, the wall protects and ensures safety.

 

 

Types of the parapet wall

In terms of appearance, the parapet wall can be classified as follows.

a)   Plan Parapet

b)  Paneled Parapet

c)   Perforated Parapet

d)  Embattled Parapet

 

a) Plain / Solid Parapet Wall:

These walls are solid structures that run across the length with no openings between them. They are more common where safety is a top priority rather than aesthetics.

 

1.   Construction process easy.

2.   Maintenance easy.

3.   Supports the basic purpose of privacy and safety.

4.   It does not give the best aesthetics to the building.

 

b) Paneled Parapet Walls or Double Walls:

These walls have projected shapes on a solid wall with no openings.

 

1. It is difficult to build.

2. Difficult to maintain. Dust and water will accumulate in the corners of the openings. The lack of openings makes it even harder to clean.

3. Supports the basic purpose of security and privacy.

4. It gives the best aesthetics to the building.

 

c) Perforated Parapet Walls:

These walls have openings in between, unlike a plain parapet wall. The openings can be of any shape. Since openings are provided, formwork should be used to support wall materials falling down. However, if pre-fabricated perforated steel is used, the process is much simpler.

 

1.   It is difficult to build.

2.   Maintenance is difficult. Dust and water will accumulate in the corners of the openings.

3.   Supports the basic purpose of security.

4.   It does not provide complete privacy.

5.   Provides good height to the building.

 

d) Embattled Parapet Walls / Perpetrate Walls:

These are the first types of walls built by man. These walls have complete openings that are continuously provided at certain distances. In ancient times, these walls served the purpose of providing protection to archers during battle, while the openings helped to shoot arrows.

 

1.   Construction process easy.

2.   Maintenance is difficult. Dust and water will accumulate in the corners of the openings.

3.   Supports the basic purpose of security and privacy.

4.   It enhances the architectural view of the building. This gives the building a historic look.

 

The parapet wall can be classified as follows based on shape and design.

a)  Flat Parapet

b) Stepped Parapet

c)  Sloped parapet

d) Curved Parapet

 

a) Flat Parapet Wall

This type of wall is widely used in buildings. Flat parapet walls are built without slope. Flat parapet walls are often used in homes, flat roof structures and commercial structures.

 

b) Stepped Parapet Wall

A stepped Parapet Wall is also used for wall sloping roof structures. This stepped Parapet Wall is built in the form of a staircase, which gives the building an attractive appearance.

 

c) Sloped Parapet Wall

These types of walls are provided for sloping roof systems such as industrial structures and trussed structures.

 

d) Curved Parapet Wall

This type of wall also called arched parapet walls are recommended for both inclined and flat rooftops.

 

Miscellaneous Parapet types

Composite Parapets:

These walls are made of one or more materials. The most common wall is

1.  Brisk masonry + Steel rails

2.  Stonemasonry + steel rails

3.  Fiberglass + steel rails

4.  Concrete walls + steel rails

 

Parapets At The Bridges:

These walls act as a barrier to vehicles and regulate traffic. They are made of concrete and sometimes reinforced. They are structurally designed to take care of loads that can cause vehicles to collide with obstacles.

Must read: Removal of Concrete Formwork: Know the Correct Time | calculations | specification 

Green Parapets:

The recent trends in urban cities to reduce carbon footprint and improve sustainability are green walls.

 

The green parapet wall has unique coatings installed on top of the existing parapet wall, which helps the plants grow.

 

Greenery enhances the aesthetic appearance of the building and improves the air quality in the vicinity.

 

Things To Keep In Mind While Construction Parapet Wall

1.   It should be plastered from both faces to avoid dampness.

2.   Water drain should be provided in the bottom of the wall to drain the rainwater

3.   Minimum height of 3 feet.

4.   Minimum thickness of 4 ½ inches

 

Repair And Maintenance Of Parapet Walls

The most common problems occurred in masonry walls. The top of the masonry walls is commonly termed as parapets. Coping are placed on the masonry walls to prevent the penetration of moisture. The defective and deteriorated coating is the main reason for the problem. Coping should be in good condition. If the coping is not in good condition they allow water to penetrate the walls.

 

Penetration of water causes structural cracks, spalling, bricks leaks and efflorescence. Copings are necessary for parapet walls. Proper care should be taken for these kinds of walls. Maintenance of parapet wall is very important. If we fail to maintain parapet walls repair properly it will create a hazardous situation.

Must read: What is Lintel? | Types of Lintel | Uses | lintel length Calculation | lintel bearing

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