Lean to Roof | What is Lean to Roof | How to Build Lean-to Roof Structure | Advantages to Disadvantages of Lean To Roof

All About of Lean to Roof

Introduction of Lean to Roof

If you are planning to build a new house then it is very important that you should select one of the best roof for your structure because roof is one of the most important parts of the structure which protects the structure from rain, sunlight and aggressive environmental conditions.

Lean-to roof is one of the best and most commonly used roofs for the structure. The lean-to roof is very easy to construct and economical as compared to the other types of roofs.

In this article, we will be discussing about Lean to roof, how to build lean-to roof structure, advantages and disadvantages of the lean-to roof structure.

Also, read: Tension Vs Compression | What Is Tension & Compression

What is Lean to Roof?

What is Lean to Roof?

A lean to roof can be defined as a roof that has only a single slope with its upper edge adjoining a wall or a building. It is a simplest type of pitched roof which is also known as the sloping roof.

Lean-to roof is one of the commonly used roofs for covering the various types of structures. The Lean-to roof is also known as one side roof because it is generally used to cover one side of the structure such as verandah.

Lean to roof is basically a free-standing structure in which the wall of one side is built at a more height as compared to the wall at another side.

The lean-to roofs are widely used in the construction of the verandahs, sheds and go downs.

Also, read: Detail of Beam Connection | Simple Framing Connection | Semi-Rigid Framing Connection | Rigid Frame Connection

How to Build Lean-to Roof Structure?

The step by step procedure to build the Lean-to roof structure are as follows.

  • Before starting the construction of the building it is necessary to do the site clearance and cut out all the trees and levelled the ground.
  • The Marking of the foundation should be done on the site as per the plan.
  • Then the excavation work should be carried out for the construction of the foundation.
  • Dig the holes for the installation of the supporting posts. Ensure that the posts should be in the vertical direction.
  • After installing the post holes into the ground, it should fix with concrete so that it cannot move from its position.
  • In the lean to roof structure, the upper side of the rafters are rested on the wooden plate which is placed on the corbel.
  • A corbel is basically a projection that comes out of the wall in order to support the structure which is resting on it. The corbel is a weight carrying member which is generally made up of stone or wood.
  • The lower ends of the rafters are nailed and notched. The rafters in the lean-to roof are rested at an angle of 30 degrees at a wall.
  • Notch the upper side of the post holes so that the rafter can be easily fitted or rest on it. After that set the nailery on posts.
  • Fasten the nailery on the wall which has a higher length so that there you can attach the upper end of the rafter.
  • The rafters should be properly attached and fixed to the wall. Then mark out the spacing of the rafter on the mailers.
  • Determine the slope of the roof by stringing a line from the top side of the rafter towards the bottom side of the rafter.
  • Attach all the rafters and fixed it properly. Then cover the roof by using suitable roofing material as per your requirement.
  • There are various types of roof covers are used in the construction of the Lean-to roof such as A.C sheets or pre-coated sheets and Mangalore tiles etc.

Also, read: What Is Rebar | Why use Reinforcement in Concrete | Types of Steel Reinforcement Bars

Materials Which Are Used for the Construction of the Lean-to Roof

There are various types of materials are available in the market which you can use for the construction of the lean-to roof. Some of the commonly used roofing materials are as follows

1. Clay Roof Tiles

Clay roof tiles

The clay roof tiles are made up of baking moulded clay which are available in different types of colours such as white, orange and brown etc. This clay roof tiles are more durable as compared to the other types of roof tiles.

2. Glass Roofing

Glass roofing

Glass roofing is one of the best roofing options which allows natural sunlight to enter into the structure. This also enhances the aesthetical look of the structure. But the transportation of the glass roof is difficult and there may be a chance of breaking.

3. Polycarbonate Roof

Polycarbonate roof

Polycarbonate sheets are very lightweight and very easy to carry from one place to another place. The polycarbonate has good impact resistance. Polycarbonate is a highly flexible material so that it can be moulded into various shapes as per the requirements of the construction.

4. Concrete Tiles

Concrete Tiles

The concrete tiles are very affordable as compared to the other types of tiles. It has good strength and durability.

5. Asphalt Shingles

Asphalt Shingles

Asphalt shingles are one of the oldest roofing materials which are used in construction. The asphalt shingles have good resistance to fire.

6. Metal Roofing

Metal Roofing

Metal roofing is versatile in design and style which requires very little maintenance and is available in various types of colours.

Also, read: Bolt Vs Screw | What Is Bolt | What Is Screws

Advantages of Lean To Roof

Advantages of Lean To Roof


There are various advantages of lean-to roof which are as follows.

  1. The construction process of the lean-to roof is very easy and economical as compared to the other types of roof structures.
  2. The construction process of the lean-to roof structure is very easy and affordable as compared to the other types of roofs.
  3. The lean-to roof has a steep slope which helps to drain off the rainwater quickly.
  4. The Lean-to roof also avoids the pooling of snow which can damage the structure or also create the problem of leakage.
  5. You can also install Solar panels on this type of roof.
  6. We can use various types of roofing materials in the lean-to roof as per our requirements.
  7. In case of the lean-to roofs the rainwater can be easily collected.

Also, read: What Is Bar Bending Schedule | Preparation as Per Bs 4466 | Tolerances as Per Bs 4466

Disadvantages of Lean to Roof

Advantages of Lean To Roof

There are also some disadvantages of lean-to roof which are as follows

  1. The Lean-to roofs are not suitable for the construction of large structures.
  2. The lean-to roofs have only one slope that’s why it may create the problem of water drainage when there will be heavy rainfall.
  3. In case of the lean-to roof the ceiling, itself takes the same slope as the roof that’s why there will be very little attic space.
  4. These types of roofs are not suitable for the areas where the wind flows with a very high velocity, it may lift up the roof.
  5. It requires more maintenance as compared to the other types of roofs.
  6. It is not possible to construct above in case of lean-to roof structures.

Also, read: One Way Slab and Two Way Slab Design Step by Step

Conclusion of Lean to Roof

Roof is one of the important parts of our home so the selection of the type of roof on our depends on the various factors such as the budget, design of our home and the environmental conditions of the area. So, it is recommended that you should take all the pros and cons of the particular roof into consideration while the selection of the roof.

The Lean to roof is the best option for the construction of small homes or sheds. Lean-to roof proves to be beneficial when it will be used in heavy rainfall areas.


Lean to Roof

Skillion is also referred to as a shed roof or lean-to. It is a single, sloping roof, usually attached to a taller wall. – It can be thought of as half of a pitched roof, or as a more angled flat roof.

How to Build a Lean-to Roof?

For Building a Lean to Roof on a House we have to follow some construction steps,

How to Build a Lean-to Shed Roof?

Asphalt shingles typically have a minimum slope rating of 4 in 12. This means that for every 12 inches of horizontal distance across the shed the roof will rise 4 inches. This slope works well for sheds that are fairly narrow, like 4 to 6 feet, but for sheds that are 8′ or wider the shed roof becomes unsightly high.

How to Frame a Lean-to Roof?

How to Lean-to Shed?

When inconspicuous, functional storage is all you’re looking for, a lean-to shed is the perfect solution. Per its name, the structure simply leans against the house or garage for additional support and provides a water-safe haven for shielding gear from the elements. If you have moderate do-it-yourself skills and tools, this is a weekend project. If you decide it’s more than you bargained for, check out these convenient lean-to shed kits on Amazon.

How to Build a Lean-to with Metal Roof?

Lean-to Roof Ideas

Anything with a slope of some kind will cause water to run off the roof. However, an ideal roof drop per foot should be at least one-eighth to one-quarter of an inch per foot. Anything less than one-eighth of an inch may pool on the roof.

Building a Lean-to Roof on a House

Lean to Roof is a style of a Shed Roof; it is also called Skillion Roof. You can think of a shed roof as one flat roof having a steep slope. In simple words, the shed roof has one single slope which can vary in steepness on the design part.

Lean-to Roof Materials

Metal roofing. Clay roof tiles. Asphalt shingle roofing. Cedar shakes or shingle roofing.

Lean-to Pitched Roof

The smallest pitch of a roof is 1/4:12, which translates to 1/4 inch rise to 12 inches of run. Such a small pitch can only work with built-up roofing or specialized synthetic roofing. Covered porches that are near trees or in areas with heavy rains should not be covered with a low-slope roof.

Lean-to Rafter Spacing for Metal Roof

But they do tend to space rafters in one of several industry-standard increments, typically either 12, 16 or 24 inches apart. These spacing intervals are measured “on center,” meaning that the measurement is taken from the center of one rafter’s horizontal surface to the center of the next rafter.

Lean-to Roof Framing

Lean-to Pergola with Roof

A pitched-roof structure (A-shaped roof) can be up to 4m high (13′). It mustn’t cover more than half of the area of your land. You will need planning permission for your pergola if it’s on the front of your house. Any sort of veranda, balcony or raised platform will need planning permission.

Lean-to Roof Cost

Lean-to roofs cost as little as $4 per square foot ($350 to $450) installed.

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