How to Tie a Porch Roof Into an Existing Roof

Whether it is a front porch roof or a back, it gives your home an exceptional area to enjoy. Tying a porch roof to your existing roof is the best idea to let you enjoy the summer breeze while getting relief from the sun’s rays. 

But the question is how to tie a porch roof into an existing roof. Whether you need a professional or you can do it yourself. In this blog, we will be sharing why you should add a porch roof to your existing roof, its different types, steps, etc. Let’s start reading. 

Why you Will Need to Add a Porch Roof to Existing Roof

There are different options for trying a porch on your existing roof. It gives your family a long area to enjoy the outdoor sights. This is especially beneficial as it protects you from the elements.

However, tying a porch is simply a new addition to your home. But it should look blended with your original home architecture. Here are the ways to tie the porch roof to the existing one with the following steps:

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Different Types of Porch Roofs You Can Add to Existing Roofs

In this article, we will discuss three common porch roofs. Each type of roof needs a different method though. Let’s know about it in detail:

1. Flat Porch Roof:

It uses a rubber roof membrane. The top edge of this flat roof should be covered by the main roof shingle to make sure that there is no leak between the junction. 

2. Shed Porch Roof:

You should underlay the shed porch roof to the top section of the roof. It must be covered by the main roof shingle. Installing a metal flashing between these two junctions can be a great deal. 

3. Gable Porch Roof:

It can be built over an existing roof. But in that case, it may need a complex structure. The gable porch roof also needs metal flashy g between the two junctions. 

Tying a porch to the existing roof is not a task. Below we will provide a step-by-step guide about how to tie a porch roof to an existing roof.  

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Step-by-Step Guide to Tie Porch Roof to Existing Roof

Start by determining the location and size of your porch roof. Measure the area where you want to add the porch roof and make sure it aligns with your existing roof.

Step 1: Knowing Local Building Codes Avoid Further Hassles

Before you start your project, you should know about the local building codes and other permit requirements. Most of the time, the DIYers are afraid of getting permission due to extra cost and time.  

But by getting sanctions in the same, you can save your family from future conflicts. Apart from that, many insurance companies also do not pay claims where the work is not coded with Govt rules. 

Step 2: Rise and Run Can be a Big Factor

You must determine the rise and run before trying the porch roof to the existing roof. This is always recommended to replicate the same rise and run that your roof already has. In that case, window placement can create barriers in this route. 

First, check the wall where you want to attach the rafter to get the proper rise and run. It also gives you an idea about the length of your rafter plate that must be taken. 

Step 3: Proceed With The Rafter Plate

Once you know about the rise and run, you can know which will be the best place to plate on your wall. But make sure that it is 3 inches below the window. So, it can accommodate a thickness of at least 2 inches. In that case, you can make a pointer with chalk to give it a perfect upper-line measurement. 

Step 4: Give It Build Support First

Supporting ports add special support to your construction when Tying a porch roof to an existing one. It helps in protecting the roofs. You can find two types of supporting posts such as simple and column

If you want to give support with a simple post, then decide on the location first. Once you decide, now mark the holes in the ground where you will meet those supports. Now set the. holes with concrete. 

Step 5: Attach Valley Boards

Before you attach the value board, you need to make sure that the board covers the porch area. In that case, the different types of existing roofs may require a different number of valley boards. As an example, for hip style, you will need more. For shed designs, a valley-attaching board will be the best choice. 

Step 6: Top Plate Should Match the Roof Style

The top plate works as a supporter of the posts and it provides strength to the roof. Apart from that, measuring the roof dimensions before attaching the top. The plate will work in Tying the roof rafter later. In that case, if you have only two posts, then the top plate should be attached to the valley board. 

Step 7: Finish The Work by Tying Shingles and Plywood.

The roof cover is important as it can hold moisture and keep your roof in good condition for a long time. In that case, the roof material should be made of good quality materials. Plywood of ½ inches thick can work well as roof sheathing. 

Once you give it prominent sheathing, now cover it with shingles. Choosing a cover like your roof design will help you to get a good appearance for your roof.

Final Word

Tying a porch roof to an existing one is not easy. It needs proper planning and skill. If not done in the right manner, it can come with substantial damages. If you are an experienced DIYer with all this knowledge, you can proceed further. Otherwise, contact a good roofer to get more benefit from the task.


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