Tuesday, July 9, 2024
HomeBuildHow To Build A Gable Roof Over A Deck

How To Build A Gable Roof Over A Deck

Do I Need A Permit To Add A Roof To An Existing Deck

build gable roof over deck / porch

You need a permit to put a roof over your deck. For one, it is a safety concern. Failure to properly fasten the roof to the house could lead to collapse and injury. Secondly, if you dont attach the roof to the house properly, you could invite significant water damage into your house, resulting in major damage.

Any project involving framing or adjusting existing house framing will require a permit, regardless of where it is on your property. However, unlike a shed, even the smallest addition to your existing house roof will require a permit.

What Is A Gable Porch Roof

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.

+ Open Gable Roof Over Deck

Open gable patio cover over trex brasilia deck is one images from stunning 20 images open deck roof ideas of Get in The Trailer photos gallery. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features 2021 Google LLC.

Roof Line At Front Porch Porch Remodel Building A Porch Front Porch Design

Also Check: What To Know About Getting A New Roof

Ways To Keep Dry Under Your Deck

If you want to buy a manufactured system rather than build your own as we show here, you have a lot of choices.

  • One option is to cover the deck boards with a watertight membrane. DeckRite makes a deck floor covering that has the added advantage of creating a dry space below the deck. For more information, visit
  • If youre building a new deck or replacing your deck boards, you can use a system like Trex RainEscape, which installs in the joist spaces before you install the decking. The advantage of this system is that it allows you to easily add lighting or other wiring in the joists, and cover the bottom of the joists with bead board or any attractive ceiling finish you choose. Learn more at trexrainescape.com
  • If your deck is already built, you can cover the bottom of the joists with a system like TimberTechs DrySpace. One advantage these waterproof deck systems have over simply screwing roof panels to the bottom of the joists is that you can remove a section to gain access to the joists if necessary. To learn more, visit timbertech.com
  • These are just a few examples of whats available. Search online or visit your local lumberyard or home center to find other options.

    How To Build A Gable Roof


    This article was co-authored by wikiHow staff writer, Hunter Rising. Hunter Rising is a wikiHow Staff Writer based in Los Angeles. He has more than three years of experience writing for and working with wikiHow. Hunter holds a BFA in Entertainment Design from the University of Wisconsin – Stout and a Minor in English Writing.There are 16 references cited in this article, which can be found at the bottom of the page. This article has been viewed 371,235 times.Learn more…

    The gable roof is one of the most popular roof designs due to its attractive symmetrical shape, efficiency at shedding water, and option for attic space. Building a gabled roof requires basic carpentry tools and skills, but as long as you make precise cuts and measurements, youll be able to make a roof for any simple structure.

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    Is Gable Roof Framing Hard

    While Im hoping this tutorial makes it easier, gable roof framing takes a lot of accurate math and calculations.

    Its important to take your time, plan ahead and validate the structure as youre building it.

    Im hoping this simple tutorial for how to build a roof overhang over an exterior door will help shed some light on the process and give you the confidence to make your own awning for an entry door!

    Ok, enough talk lets get to it, shall we?

    Two Videos Cover How To Build Patio Roof Attached To House

    Video 1: Design a Roof extension over an existing patio

    Existing patio is outside the dining room on the west side of the house. the patio is essentially unusable on a sunny afternoon in the summer.

    This video looks at a couple of design options, including attaching the roof ledger below that of the existing eaves and setting the patio roof atop the existing roof.

    The latter option was chosen because the low roof and roof beam would have blocked the view from the dining area. Did we say that the house is in Bozeman, MT, where the view is worth viewing?

    Work from the view back, not from the house, out.

    • Calculate the sightline clearance height, about 6 feet, 2 inches, in this case.
    • Determine the beam size: 8 inches in this case.
    • Choose a roof pitch and roof structure

    This places the new roof on top of the existing roof. The next question is what to do with the existing eave under the new roof: kick it or keep it?

    To tie the design together, Peter chose to cut the rafter tails off the extend the exterior wall up to the underside of the new roof. As it turned out, the existing roof structure is a truss system, but they were able to contact the original truss manufacturer to verify that cutting the tails off would not jeopardize the structural integrity of the trusses.

    From the we-hope-this-is-obvious desk: Never alter engineered trusses without the approval of a licensed professional engineer. Ever.

    The next design decision: material selection

    Video 2: Construction process

    Recommended Reading: How Do You Tarp A Roof

    Build Gable Roof Over Deck Porch

    Building a deck with a gable roof. 7 Roof felt and Shingles. I could drop the whole deck but I dont want a tripping hazard getting in and out. If playback doesnt begin shortly try restarting.

    I am now contemplating the idea of doing an attached deck with a gable roof structure sitting on the deck. Many porches use 22 diameter corner and intermediate. Ad Save 2000 on Your New Roof When You Call or Request Pricing Today.

    Gable roof over deck plans. With a little work you can construct your own carport with a gable roof to allow for rain runoff and support of heavy cover the decking with roofing felt. 4 Setting the rafters.

    Build Roof Over Deck Gable Build Roof Over Deck Gable 2. 2 Setting your ledger board. Of course sunrainsnow will get between the 2 roofs but I plan to leave 6 inches space and thats all.

    Adding any deck covering or enclosure will typically cost between 1000 10000. If you are building a gable roof over your deck then it only necessitates a structural response and can offer the right amount of support and heat which in turn look quite lovely and can provide you with a cosy outdoor summer and winter experience. A gable roof is a simple symmetrical triangular roof.

    The hand framed roof isnt difficult to build and is designed for a vaulted ceiling. The gable design of the roof will also allow for excellent rain and snow runoff in wet climates. Building a gable roof over your existing deck will make it more comfortable providing shade and shelter from the rain.

    Install The Intersected Beams

    Complete Gable Roof Build! Full instructions for beginners!

    On top of the 8×2 rafter and aligned above each of the original beams, install the intersected beams of equivalent size in a calculated straight line one after the other in a pecking order. If they are 6×6, then install 6×6 beams in a standing position.

    All new beams must be of exact height so that the lowest part of the roof will have an even surface to sit on.

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    Install Gutters And Downspouts

    If you want to install gutters for your under deck ceiling, plan ahead and leave space for them. You may have to get creative to come up with an attachment method, depending on how your deck is built. Since the in-stock 12-ft. panels didnt quite reach the beams on Runes deck, he nailed vertical 2x4s to every other joist to provide an attachment point for the gutters. Then he screwed the gutter hangers to the 2x4s. Slope the gutters toward the downspout for drainage.

    Read Also: Will Roof Leak With One Shingle Missing

    Roof Sheathing And Material Quantities

    Heres how to determine the quantities needed. Theres an example below.

    Determining roof sheathing: These factors give you a ballpark estimation of your roof deck area based on roof pitch. Multiply the Factor by the number of square feet in your homes footprint including the garage to determine the amount of roof sheathing required.

    Pitch Factor

    14/12 1.54

    16/12 1.67

    Determining roofing material: Once youve figured the square feet of roof deck, multiply that number by 1.05 for the roofing material total. The extra 5% accounts for trimming and waste.

    Sheathing and roof material example: 2,000 square foot home and garage footprint with a 6/12 pitch roof:

    • 2,000 x 1.12 = 2,240 square feet of sheathing
    • 2,240 x 1.05 = 2,352 square feet of roofing material

    If you prefer punching in numbers, here is a calculator for roofing area and roofing material.

    Read Also: How To Fix A Leak In A Trailer Roof

    Near The Front Of The Bus

    A skoolie roof deck near the front of the bus might be a good idea if you are not doing a roof raise and have just one emergency hatch. This leaves room for a lot of solar panels in the back of the bus.

    A nice idea of having the deck towards the front is the fact that you may not need a ladder then. You could just get on the hood and then get up to the roof that way versus installing a ladder.


    • Might not need a ladder


    • Might need to alter it in a way to make it aerodynamic

    How To Build A Gable Roof Step By Step

    Build Gable Roof Over Deck / 21 Reverse Gable Framing To End Your Idea ...
  • Use an online roof pitch calculator to obtain the rafter length for the pitch that you desire.
  • When shopping for lumber, select the straightest 2×6 boards that you can find for the ridge board.
  • After obtaining enough 2x4s and 2x6s to build the roof, begin by building the top plate.
  • The width of the top of the wall determines whether you build the top plate from 2x4s or 2x6s.
  • Nail two layers of boards along the top of the walls where the rafters will set.
  • Offset the seams of 2x4s or 2x6s by at least 24 inches as you build the top plate.
  • Attach top plate boards with 8-penny nails.
  • Working along the top plates, make marks every 24 inches for placement of ceiling joists.
  • Cut 2×4 joists the width of the building beneath where the gable roof will rise.
  • Center each joist over the marks on the top plates.
  • Position joists so that they are flush with the outer edges of the top plate.
  • Nail them in place with construction nails.
  • At this point in the how to build a gable roof directions, you must cut the rafters.
  • Refer to the rafter length determined according to the roof pitch you chose.
  • If you want the roof to overhang at the eave, add that to the length of the rafters.
  • Cut on the line with a circular saw or miter saw.
  • On the other end of the rafters, mark where the rafter will sit on the top plate.
  • Use the framing square to mark a triangle for the seat cut.
  • Your overhang amount will be beyond the seat cut.
  • Saw out the triangles to complete the seat cut notches.
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    Options For Putting A Roof Over A Deck

    A deck roof can take different shapes and styles, but it will be best if you choose a style that compliments and blends with the design of your home as well as its surroundings.

    To view this video please enable JavaScript, and consider upgrading to aweb browser thatsupports HTML5 video

    A roof over a deck is usually called a patio cover. Your options include:

    • Shed Roof: Sometimes referred to as a lean-to roof, is a roof that attaches to the house where the rafters lean against a wall. This roof design has only one slope.
    • Gable Roof: Gable roofs have two sloped sides and are more complex to build. Gable roofs will need to be tied into the existing roof or wall structure. This roof design is not recommended for DIY unless you have carpentry skills.
    • Pergola: Pergola is a structure that is often not attached to the house . Pergolas use an overhead open-frame concept that provides shade but doesnt provide protection from the rain. A typical pergola is raised using posts and laced with wooden beams and rafters that interchangeably run across it. Often, vine trees are planted and allowed to climb up the wooden structure to form a canopy.

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    Roof Sheathing And Material Costs

    Sheathing material is sold in 4×8 sheets for 32 square feet per sheet. Divide the square feet of roof area by 32 to determine the number of sheets needed, and add two or three sheets for trimming and waste.

    • Roof sheathing cost: $15.50-$20.00 per sheet / 48-63 cents per square foot

    Shingles are sold in bundles containing approximately 33.3 square feet.

    • Shingles cost: $20-$80 per bundle / $.60-$2.40 per square foot

    Felt paper, starter shingles, flashing and ridge vents are accessories required to complete the roof.

    • Roofing accessories cost: $28-$50 per square / 28-50 cents per square foot

    The more complex the roof is, the higher the cost will be. Installation also costs more on homes with more than one level.

    • Roofing installation cost: $150-$300 per square / $1.50-$3.00 per square foot

    Read Also: How Much Cost To Install Metal Roof

    Ensure Working Space For Construction Is Adequate

    Typically, roof deck construction requires more working space than a ground-level deck. Youll need to determine how the crew will access your roof, whether thats by interior stairs leading to the roof or outdoor scaffolding. Not all, but some homes may even need crane access for their rooftop deck, which means you must have enough space for the crane to move around trees, existing outbuildings, power lines, or other obstructions.

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    What Is A Roof Over A Deck Called

    Building a porch onto a gable roof.

    Gable roof is a common name for a deck roof. Its the most popular type it has slopes on the sides for water and snow to come off to the ground and not your deck. As a result, you get a triangular shape of such a roof. There are lots of types that have numbers like 6/12 in their names. This means that the construction elevates 6 feet over 12 feet of the size.

    Such roofs are suitable for all kinds of houses by design and size.

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    Benefits Of Building A Roof Over A Deck

  • Protection from the Element One of the top reasons for building a roof over a deck is for protection from the elements. Whether its the blazing sun, pouring rain or bad weather altogether, you can cover the deck area and still enjoy sitting outside and enjoying nature on a sunny or rainy day.
  • Unending Cookouts With a roof over a deck, you can enjoy barbecuing or grilling outdoors almost anytime you want. Even when the weather gets colder, youll still be able to grill burgers, chicken, ribs, brats or veggies and enjoy the taste of grilled food. Cooking time might be a tad longer, but its worth it to cook outside throughout the year.
  • Virtual Clothes Dryer If you hate using your dryer and watching your electric or gas meter spin, drying clothing under a covered deck roof is an excellent solution for hot or rainy days. You save on your energy bills when you dry clothes outside.
  • Cultivate your Plants When you want to start seedlings or just give your plants a taste of sheltered sun for growth, a covered deck is of significant benefit. While you enjoy the outdoors, your plants get tender loving care and daily sun, whether spring or summer.
  • How To Build A Shed Roof Over My Existing Deck

    Unless youre experienced in residential roofing construction, you probably dont want to build the roof yourself. However, you might want to know the process of how its done. Take a look at our step-by-step guide for building a shed roof over your existing deck:

  • Step 1: Before you begin, make sure youre matching the house roof pitch angle and overhang for your roof.
  • Step 2: Install post base connectors. These are used to attach the support posts to the frame of the deck. For a solid connection, youll have to make sure the frame has the appropriate blocking.
  • Step 3: Install the support posts to the post base connectors.
  • Step 4: Keep the support posts in place by installing temporary bracing. The tops of the support posts should be notched to hold the header beam.
  • Step 5: Install the header beams to the support posts. We recommend using thru bolts for a strong connection.
  • Step 6: Install the ledger board, which will support the rafters. You can install it by flashing and bolting in place to the house wall.
  • Step 7: Mark and cut your rafter angle to the roof pitch and then lay out your rafters. Nail the rafters in place to the ledger board.
  • Step 8: Attach the rafters to the header using framing nails.
  • Step 9: Create the subroof by installing the roof sheathing over the rafters.
  • Recommended Reading: What Thickness Plywood Is Used For Roofing


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