What Is a Cavity Wall | How to Build a Cavity Wall | Cavity Wall Detail | Cavity Wall Thickness | Cavity Wall Insulation Pros and Cons | Brick Cavity Wall

What Is a Cavity Wall?

A cavity wall consists of a hollow space between them. The cavity walls normally consist of two skins, which should be brick, cinder blocks, or reinforcement concrete blocks, etc.

The absorbent materials are used in cavity wall construction to that draw out the rainwater and consist of humidity in the wall. The weep hole is constructed above the window or base the wall to draw out the rainwater.

It is joined together by metal ties and at suitable intervals and separating by an air space. The cavity wall generally is an exterior wall but sometimes it’s used as an interior wall.

The weep holes provide an air circulation system in the cavity walls that help to Come out of the evaporated water outside of the cavity.

Approximately two meters apart at the base of each story, a weep hole is created by separating several vertical joints.

Also, Read: What Is a Partition Wall | Uses of Temporary Interior Wall | Walling Materials | Types of Interior Wall Materials | Types of Partition Walls

How to Build a Cavity Wall?

• To leaves of the masonry wall separated by an air gap and tides by ties is known as a cavity wall.
• The cavity walls normally consist of two skins, which should be brick, cinder blocks, or reinforcement concrete blocks, etc.
• It is joined together by metal ties and at suitable intervals and separating by an air space.
• When it is construed as a non-load bearing wall then the two skins of the cavity wall are maybe the equal thickness.
• As required, sometimes the inner wall is thicker than the outer wall.
• The weep holes provide an air circulation system in the cavity walls that help to Come out of the evaporated water outside of the cavity.
• Approximately two meters apart at the base of each story, a weep hole is created by separating several vertical joints.

Also, Read: Sealing Brick Work | Advantages of Brick Sealer | Interior Brick Sealer | Exterior Brick Sealer | How to Seal Brick Wall | Best Brick Water Repellent Sealer

Cavity Wall Detail:

• The cavity wall is termed as skins. It is contained two layers of masonry like a bricklayer or concrete layer reinforcement concrete etc.
• It is joined together by metal ties and at suitable intervals and separating by an air space.
• The cavity wall generally is an exterior wall but sometimes it’s used as an interior wall.
• If it is a non-load bearing wall then the two skins of the cavity wall are maybe the equal thickness.
• To fulfill the structural requirements sometimes the internal skins are thicker than the external skins.
• At least four to five ties are used at each square meter to provide an adequate bond between the inner and outer skins of the cavity wall.
• A flexible vertical damp proof course should be provided at the doors and windows reveals to prevent the entry of moisture in the room.
• The width of the cavity wall should not more than 100 mm and not less than 40 mm.
• To protect from rust the mild Steel is used that is galvanized or dipped into hot tar or sanded.
• The vertical distance and a horizontal distance of ties should not exist 450 mm and 900 mm.
• Sometimes a DPC should be provided to prevent the damp between the walls.
• The damp-proof course was made of lead, pitch, asphalt, and slate.
• At regular intervals at the steel or wrought iron wall ties are used to tide two half of the walls.

Also, Read: What Are Weep Holes | Need for Weep Holes | Foundation Weep Holes | Types of Weep Holes | Weep Holes In Retaining Wall | Window Weep Holes

Cavity Wall Construction Details:

• When an air space or hollow area is exits between the two walls, then it is called a cavity wall.
• The inner wall is generally made of masonry, like bricks, cinder blocks, concrete blocks, reinforcement blocks, etc.
• The humidity into the wall and the rainwater slowly draw by the masonry because it is an absorbent material.
• Another system of the cavity is to drain water through the weep holes lies above the window or base of the wall.
• The weep holes provide an air circulation system in the cavity walls that help to Come out of the evaporated water outside of the cavity.
• Approximately two meters apart at the base of each story, a weep hole is created by separating several vertical joints.
• The cavity holes are provided above the window because it prevents dry rot of wooden window frame.
• It is commonly referred to provide both sides of the cavity walls.

Also, Read: Different Types of Concrete Finishes | Types of Wall Finishes | How to Finish Concrete | Concrete Finish Machines | Types of Concrete Finishes for Driveways

Cavity Wall Foundation Detail:

• The cavity portion between the top of the foundation concrete and the ground level is filled with 1:2:4 at least 150 mm below DPC.
• Under the two leaves separately, DPC is provided.
• The rainwater has access to drain out the outside of the leaves by the weep holes.
• The cavity walls are existing up to the concrete bed.
• Just below the floor level with a damp-proof course, the cavity extent up to the base of the footing.
• If the brickwork below the ground level is not correctly done, then the water enters from the joints and reaches up to the cavity causes dampness in the wall.

Also, Read: What Are Walls | What Is Interior Walls | Types of Interior Wall Materials | Types of Wall Construction | Types of Load Bearing Wall

Cavity Wall Thickness:

• The wall that is provided as a non-load bearing wall and that walls are hollow is called a cavity wall.
• The two leaves of the cavity wall are equal thickness. Sometimes the inner wall is thicker than the outer wall.
• The double walls of the cavity wall are 260 or 275 mm thick according to the building codes.
• The inner and outer walls of the cavity wall approximately 102.5 mm thick, consider 65 to 70 mm thick.
• Sometimes the inner wall should be increased to 215 mm or more when the floor is to be supported, or a heavier load is acting.

Also, Read: What Is Shear Wall | Classification of Shear Walls |Advantages of Shear Wall | Functions of Shear Wall | Important Point Shera Wall

Internal Walls Construction:

• The walls that divided the building into many compartments or created a private space is called internal walls or partitions walls.
• They can provide privacy, acoustic, fire resistance, and flexibility of layout.
• The partition wall may be hollow or solid, and it is constructed of bricks, cinder blocks, or RCC concrete blocks.
• It can be a form of frame structure like timber, steel, or aluminum frame clad with timber board, steel board, metal, or fiberboard. Sometimes the internal wall may be glazed.
• Sometimes it is used as a load-bearing wall and create a designer modular system.

Also, Read: Estimation for Building Works | Centre Line Method | Long and Short Wall Method

Brick Cavity Wall:

The cavity wall we can construct by many things that should be bricks, RCC concrete blocks, or cinder blocks.

Brick Cavity Walls:

• The cavity walls are made of two brick walls or leaves called brick cavity walls.
• In the two leaves or walls of the brick, a hollow space is a lie that is called a cavity.
• The weep hole is constructed above the window or base to draw out the rainwater from the brick cavity walls.
• It is joined together by metal ties and at suitable intervals.

Also, Read: What Is Reinforced Brick Masonry | Construction of the Reinforced Brick wall | What Is Reinforced Brick Concrete

Cavity Wall Insulation Pros and Cons:

• In building construction, there are have many pros and cons to cavity wall insulation.
• But there have more pros than cons-

Pros of Cavity Wall Insulation:

There are have many pros to cavity wall insulation –

• It controls the atmosphere in the house.
• It helps to keep the house warm in winter and cool in summer.
• it’s reduced the monthly electricity bill to reduce the uses of the room heater or air conditioner.
• The polystyrene bead is used as an insulation material that is so small so it can pump easily if even the cavity is lean.
• The loss of heat in the winter season should be reduced by using cavity wall insulation. Space between two walls is work as a lid that prevents the escaping of heat from the house.
• The material that is used in cavity wall insulation is cheaper and recycled materials.

Cons of Cavity Wall Insulation:

There are have some cons of the cavity walls insulation –

• Sometimes the cavity wall insulation cost is increased by using expert workers or special tools to inject the cavity with insulation materials.
• The risk of an inexperienced installer is another disadvantage of cavity wall insulation. The poor work of the inexperienced installer makes the wall damp.
• The cost amount of cavity wall insulation depends on the cavity or gap between the internal and external walls.
• If the width of the cavity is so small then the heat is not properly balanced in winter and summer.
• This cavity wall construction does not apply to all houses.it is not used in old buildings where the wall is solid.

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