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HomeBuildHow To Build A Porch Roof

How To Build A Porch Roof

Do You Need Foundations For A Porch

How to Build a Clean ‘n Simple Porch Roof – Part 1 of 2

A porch is a covered, single-storey structure that can be enclosed, and projects out from a house or other building. It will require foundations, and the junctions between the walls of the porch and those of the existing building will need to be properly sealed.

Building A Porch Roof Using Trusses

A planar truss, like the one above, lies in a single plane and is usually used together to form the roof support structure. They are extremely strong and normally constructed off site and made to specific measurements. Therefore, it is very important to ensure your measurements are correct before ordering.Porch roof construction using trusses is much like using basic rafter construction as outlined above with a few exceptions. Trusses definitely expedite the process.

How To Attach A Porch Roof To An Existing House

Attaching porch roof to house mycoffeepot org construction of a roof addition over an existing concrete patio in that day we found out our porch roof wasn t really attached to theBut i know that the top edge of the porch roof should be under the bottom edge of the house roof, so that rainwater will flow from the.But we also needed to work with the houses trusses.Cut one side of the horizontal roof beam on an angle so that the rafters sit flush on it.

Diy adding a porch to a house size:Existing patio is outside the dining room on the west side of the house.First, we had to find out where we could attach the new porch to the house.Fix the back channel to the fascia boards underneath the gutter directly.

Here are 5 different ways that you can do to attach a patio roof.How do you attach a porch roof to an existing roof?Im now moving to install 4×4 posts and 2×8 roof beams on top of the posts.If i am calculating correctly, the pitch of the porch roof will be 2:12.

Install some riser brackets for more height.Install some riser brackets for more height.Install some riser brackets for more height.Install the two outer rafters and attach a plain rafter beam to the very edge of the existing roof.

Leave the decking or sheathing in place.Make the patio roof a little bit higher.Make the patio roof a little bit higher.Make the patio roof a little bit higher.

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Install The Roof Boards

To bevel the first roof board, set your table saw or circular saw to 23 degrees and rip a bevel on the groove edge of the board. Align the board with the ends of the trusses and nail it with 16d galvanized nails. Install the remaining boards, making sure to snug the joints tight before nailing them. Let the boards hang out past the last truss to form the gable end overhang. Cut the last board on each side to fit at the peak.

When you’re done installing the roof boards, snap a chalk line at the gable end and saw them off to leave an 18-in. overhang. Finish the gable end overhang by installing a pair of rafters and the 1×3 trim. Hold the gable end rafters tight to the underside of the cutoff roof boards and screw through the roof boards to hold the rafters in place. Then cut 1×3 trim to cover the end grain of the roof boards. Extend the trim around the corners and return it along the roof edge to the house.

Construct A Jig To Assemble The Roof Trusses

Unschooling Royalty: The Deck Roof

Prime Before Painting.

Prime and paint the truss parts, wall frame and screen stops before assembly. Prime the wood with a special stain-blocking primer such as Zinsser’s oil-based Cover-Stain. Then brush on a coat of acrylic exterior house paint. Make sure to prime every cut end as you work otherwise, these areas will absorb moisture and cause staining. We prefinished the roof boards with an oil finish .

How to construct the roof truss jig:

It’s easiest to assemble the roof trusses first, using the deck platform as a work surface. Screw two sheets of plywood to the decking and use the dimensions in Figure J to chalk lines indicating the top of the rafters and the bottom of the 2×6 crosstie. Cut triangular blocks and screw them to the plywood to hold the rafters in alignment as you assemble the trusses.

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Flashing A Patio Roof Ledger

Unless it will be protected from rain by the houses eaves or a solid roof, a roof ledger that is fastened directly to a house with wood siding should be capped with galvanized metal Z-flashing that tucks up under siding to prevent water from seeping in behind it.

Where integral flashing isnt possible, such as on a stucco wall, use Z-flashing and caulk the top edge. This is a job you must do before fastening the overheads roof rafters in place.

You can buy L- or Z-shaped flashing or bend it yourself. To bend sheet-metal flashing, make a form by clamping two 2 by 4s together on each side of the metal, and then hammer the metal to create a sharp edge at each fold.

Fit the flashing in place, caulk the top edge, and nail it with galvanized nails long enough to penetrate at least 1 inch into the structural members. Then caulk the nail heads.

If the house is sided with shingles or lap siding, simply slip the metals top edge up under the bottom edge of the shingles or siding as far as possible.


Plan Ahead To Avoid Construction Headaches

You can add this screened in porch to almost any house, but attachment details may vary from what we show here.

  • On most two-story houses, you won’t have to worry about tying into the roof, but you may have to situate the porch carefully to avoid covering a window.
  • The house roof sloped 5 in. per foot and extended 18 in. at the overhang. Your roof may vary from this, and the details of how the porch ties in will vary as well.

These illustrations above show the plans for the screened in porch, deck framing, gable framing, ledger, truss block, side walls and the end wall. To print these how to build a porch plan, see Additional Information at the end of this story.

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Porch Roof Plans And Construction

Good planning takes time and will serve as a stepping stone for construction that leads to the good quality of every porch roof. Different designs and styles of porch roofs should vary on the style of the house to achieve a satisfying and best result.

This article contains information about the common porch roof types, as well as a few tips and guides for the construction process.

Achieving the desired porch roof will merely depend on the style how the experts will work, the designs complexity, and the difficulty of the design as well. To learn on how to connect a porch roof to a house, we have a separate post you can check out.

A gable roof is considered to be the simplest and most common type of porch roof. This comes in the shape of a triangular roof projecting within the ridge and down to the enclosure center.

Gable porch roof plans should be considered in order to build and construct this type of roof with a good quality. This type of porch roof is designed in order to shed water and snow for safety purposes.

This overhangs the enclosure wall on sides which requires the use of fascia and soffits. This is commonly used knowing that every design of the house will blend into its form. On the other hand, a gable roofs peak may sometimes cause problems, especially when it interferes with the windows of the house.

A hip roof porch plan is another way of planning for the construction of another type of roof porch which is the hip roof porch.

Staple The Screen To The Walls

DIY Porch Roof: Building a Simple Pitched Roof Step by Step

The charcoal aluminum screening we used is strong and long-lasting, but you have to handle it carefully to avoid creases and dents. Carefully unroll the screen on a large work surface and cut lengths about 3 in. longer than you need. Reroll each piece and carry it to its location.

Start by tacking the two corners, making sure the screen is square to the opening. Then stretch the screen slightly and staple the sides, top and bottom. Place 1/4-in. staples every 3 in.

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Check The Porch Level

The next step you must do in this project is checking whether not the surface of the porch is flat or level. This one is another crucial thing that people often miss because they think that it is not necessary.

To be able to build a good and functional roof addition, the porch must be at an even and stable level. If unfortunately, you find that the porch level is uneven, you must fix the problem before starting the project of roof addition. Doing so can prevent you from some possible issues that must you to rebuild everything from the start.

Get Started On Your Porch Roof Construction Plans

Adding a roof over your porch doesnt have to be a difficult process. Using the steps weve outlined above, you can build a roof over your porch that will improve your homes curb appeal and give you and your family a nice place to hang out and relax.

If you need help with the porch roof framing, weve got you covered. All you have to do is get in touch with our team to schedule a free consultation. If you want us to complete the project for you, well communicate with you every step of the way so that youll know exactly whats going on. We wont stop until youre completely satisfied with your new roof.

At Legacy Service, we also provide a variety of other types of service, including but not limited to siding installation, window replacement, and more. If youre looking to improve your home by building a roof on a porch, give us a call at 215-798-9790 or contact us here today!

    Contact Us

  • 95 James Way, Suite 100 Southampton, PA 18966

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Install The Joists And Joist Hangers

Nail through the joist hangers into the beams at the house to hold them in place. Then connect the opposite ends of the two beams at the front with a 2×10 cut to the same length as the ledger. Adjust the resulting frame until the diagonal measurements are equal.

Then brace the frame against stakes pounded into the ground to hold it square while you install the treated posts, joists and decking. Sight along the outside rim joist occasionally and adjust the length of the joists as needed to keep the front rim joist straight.

What Is A Gable Porch Roof

Building a Front Portico

The gable porch roof is a very simple design. This type of porch roof is basically a triangular structure that covers one or more porches.

The building materials used to construct the gable porch roof are usually pre-fabricated, which means they have been cut and shaped to fit together at right angles, but there may be instances where you may need to use an angle grinder or other tools to cut and shape your own pieces.

Gable porch roofs are typically supported by walls on two sides, with the roof extending over one open side. Because of their simplicity, gable porch roof designs can be easily altered to suit your needs.

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Attach Trim And Sill To The Outer Walls

Nail a 2×10 trim board over the outside joist, 1-1/2 in. below the top surface of the deck. Cut a 2×4 sill piece to width and bevel the top on a table saw. Miter the ends and nail the sill to the top of the 2×10 trim board.

This illustration shows how the corners are assembled and the trim is installed.

Mark Rafter Plate Location And Remove Siding

Now that you know the rise and run, you know where to place the rafter plate on your wall. Make sure it is at least 3 inches below any windows allowing for the thickness of your roofing materials .Snap a horizontal chalk line at this point a minimum of the length of the flooring below. This will be your “upper” line measurement for the rafter plate.

Measure down from this line the width of your rafter plate. Usually, it is a 2×6 board, so in this case, measure down approximately 6 inches.Snap a horizontal line at the mark – it is your “lower” rafter plate line. These two lines represent the location of your rafter plate.Carefully remove the siding contained within those lines to expose the wall studs or other supporting material. Disregard if placing rafter plate on brick, etc.

Note: In our building project depicted by the photos on this page, the rafter plate and ledger board were already exposed after we removed the old porch.

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How To Build A Porch

Project Guide: Roof Sheeting

Help & Advice> Project guides> Roof Sheeting

Building a porch is a great way to add an attractive entrance to your home and can bring about a number of benefits. But what are the planning regulations involved in building a porch, what are the benefits of building a porch, and how do you build a porch? Read on to find out everything you need, and feel free to get in touch if you have any questions or queries.

Determine Rise And Run

Porch Roof Framing & Shingles – How To

When building a porch roof you have to determine the rise and run of your porch roof. Normally, you will want to replicate the same rise and run you have on the main roof of your home.Sometimes this is not feasible due to window placement but you want to get as close to it as possible.Next, determine the location on your wall where you will attach the rafter plate to get the proper rise and run. Our basic rafter length calculator will give you a general idea of how long your rafters must be for a given rise and run.

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How To Install & Build A Porch Roof

A porch roof is essentially composed of layers of specialized materials that are designed to last for many years of natural exposure. Above the structural trusses or rafters, your roof will be covered in 3/8 or 1/2 tongue and groove plywood. The plywood for the roof comes in 4×8 sheets and will hold the roof members together much like decking secures the deck frame. The next layer will be a minimum #15 roofing felt, which can be stapled in place over the plywood to create a water tight barrier for the shingles to cover. Install drip edge flashing to the lower edge of the roof and step flashing at the house wall.

9.Roof Felt

Tools And Safety Gear

In order to cut your rafters, youll need a jigsaw or circular saw and a rafter square to measure your cuts. You should wear a helmet, safety glasses, and gloves throughout construction, and only use sturdy ladders with rubber feet. Make sure theyre always placed on level ground to avoid falling. Cutting rafters requires some experience with a saw. Each rafter will need a tail cut, a plumb cut, and a birds mouth cut to install securely into the frame of the roof.

Youll also need at least one other person to help install the header boards and place the rafters. Depending on the size of your porch roof, you may need to use scaffolding to keep you secure while you place the shingles. Walking on a roof requires care, and the wrong step can damage your roofing material and lead to leaks.

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How To Work Out The Lengths Of Rafters

Pythagorean theorem: We can use the Pythagorean theorem , then find the square root. In our example, our porch roof would be 24 squared plus 20 squared , which added together equals 976. Then, taking the square root of 976, we get 31.24. So, your rafter length would be 311/4 inches

Example: 242 + 202 = 976

Let’s say our roof is a 10 in 12

  • 10 x 10 = 100, then 12 x 12 = 144 add them together = 244
  • Find square root, which is 15.62
  • This means that for every 12 inches our roof travels, the rafter will be 15.62 inches longer.

But, as not all roof runs work into exact multiples of 12, we need to take it a step further to make it easier.

To cut our rafter, we place our square on to our timber. Lining up the marks 10 and 12. We draw a line down the top cut side we then measure down the timber 31.2 inches, put our square back on, lining up the 12 and 10 again, but making sure this time that the no 12 is on our bottom mark, then draw a line for our bottom or seat cut.

Rafter lengths

Building A Porch Roof

How to build a porch roof frame

Building a porch roof or screened in porch roof over an existing deck or patio can be fairly straight forward or very complex depending on the type of roof you choose.We show you how two different roofs are constructed so you will know what is involved.Most porch roofs are typically shed roofs or variations of hip roofs.The biggest challenge is determining the rise and run and cutting a “bird’s mouth” at the outer end of the rafters that rests on the header.

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