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HomeBuildHow To Build A Roof Over Existing Deck

How To Build A Roof Over Existing Deck

How To Build A Deck Over An Existing Roof

Installing a Lean-to Roof on an existing Deck

A professional builder would typically do this by erecting two columns one at each end beneath the new deck and laying beams across the top. If youre doing this on your own, youll need to figure out how to support these columns with post-tension cables or pier blocks.

Then you will need a platform made of right-angled planks that can support the weight of your deck, as well as enough space between each board for water to run off and a layer of insulation.

To avoid water infiltration, a water-tight EPDM rubber membrane should be put on top of the roof deck. Before dealing with the decking, make sure youve installed sleepers, or flat 2x6s laid flat on the roof. This will provide you a flat platform on which to install the decking.

Roof An Existing Deck

Determine if the deck is suitable for a roof: You will need to get the existing deck assessed to see if it is structurally sound. Your current deck may need to be replaced if there are parts that have rotted.Our timber decking guide gives more details on your decking timber options.This is also add new steps or railings if your current ones are not sufficient.Adding built in seating is also a popular option when adding a roof to a deck.The area becomes more used when there is protection from the elements,

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.

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.

Read Also: How Much Does It Cost To Replace A Shed Roof

Attaching A Deck Roof Changes The Required Permits

The most straightforward deck roof construction beside your house is to attach it to the house. But this is a no, no regarding deck roofs. Attaching a deck roof to the house changes the required permit into an addition. A house addition is a much larger permit application and fee. The construction permit must include a development permit as you have now changed the look of the neighbourhood.

It is attached to a house.

City of Calgary

This additional permit is partly to blame because of the ease of transforming a covered deck into a sunroom. Or I have even seen covered decks be enclosed with walls and becoming an extra room on the house. Which is what the city is trying to prevent, unpermitted decks becoming poorly constructed house additions. Decks with roofs need additional structural construction but still do not meet the requirements for a house addition. In the past to many have been given an inch and taken a foot. Now we all have to pay the price.

Now that you know some of what is required for a deck roof. If it is feeling like too much. Here are some deck shade alternatives.

Adding A Roof Over A Deck


Building a roof over a deck turns this area into the best possible outdoor living space. There are many advantages to a roof over your deck, such as:

  • It provides shade and keeps your family dry during wet weather.
  • It adds to the aesthetic appeal of the space.
  • Combined with screened sides, it keeps the bugs away while you relax outside.
  • It boosts curb appeal and property value.
  • It increases the square footage of your home with a three-season living room.

The best time to build a roof over your deck is during the construction of the deck itself. If you have an existing deck, its possible to add a roof to it by installing additional supports. Our experts can take care of all this and more. Discuss the following issues with your professional handyman during the deck roof design process.

Also Check: How Much To Put Metal Roof On Mobile Home

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Read Also: How To Repair A Leaky Roof Vent Pipe Flashing

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 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 you’re 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 TimberTech’s 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 what’s available. Search online or visit your local lumberyard or home center to find other options.

    Recommended Reading: How To Prevent Ice Dams On Roof

    Rubber Membrane Vs Pvc Membranes Flat Roofs

    This rubber material resembles an inner tube and can be mechanically anchored with fasteners, ballasted with stone, or glued. It is relatively lightweight and durable, however, the standard black material absorbs heat. There are light-colored options available but they are about 30% higher cost. Comparatively, it is a higher cost option, but it is something a homeowner can install. It does not, however, make a good surface for a flat roof deck and would require an additional assembly to make the flat roof acceptable for that purpose.

    PVC Sheet membranes have similar performance expectations, although PVC membranes have 2 distinct advantages.

    1 when installed by a professional applicator, PVC membranes are integrated into the building envelope and come with a sound warranty.

    2 PVC sheet membranes once again are the only product of these comparisons that provides an attractive walking surface in addition to its roofing membrane performance in a single product application.

    How To Build A Glass Roof Over A Deck

    How To Frame A Roof Over A Deck | Outdoor Kitchen Part 2
    • Written by Michelle Keefe on Nov 13, 2010To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience.Reviewed by

    Most outdoor areas and decks can be covered by a glass roof. By utilizing a glass roof, you can add décor, appeal, visibility, and openness to your space while also being protected from the elements such as rain. By adding a glass roof to your deck, you then have the option to convert the space into a conservatory, sunroom or even an outdoor entertainment area. You can create a functional and beautiful glass roof over your deck with little expense by using old or recycled windows. By utilizing old or recycled windows, you achieve the glass roof while saving money over large glass pieces or individual tiles.

    Don’t Miss: How To Deck A Flat Roof

    How Do You Build A Deck Over An Existing Roof

    A deck built on top of an existing roof might be a lovely addition to your home. The challenge is that it will require some form of supporting structure, as well as waterproofing and any penetrations. Well go through how to build a in this guide. Because installing a deck on top of an existing roof might be difficult, its important to do your homework before getting started. As a result, we will go over a few key points.

    Advantages Of Installing A Metal Roof

    Among the roofing materials available in the market, metal roofing is one of the best choices you can make. It offers you the following extraordinary benefits:

    • Energy efficiency: If we compare it with other materials like, for example, asphalt shingles, metal roofers provide the best results keeping your indoor temperatures at comfortable levels. They will keep your home cool during summers hottest days, thanks to their reflective properties. Besides, their reflective coatings increase their capacity to cooling your home. You can obtain up to 20 percent of savings in cooling costs since your AC unit will consume less energy to cool your home indoor.
    • Wind and Fire Resistant: Electric storms and lightning can cause fire damage. But, the best defense your house may have against these natural phenomenons is a metal roof since they are fire-resistant. With an asphalt shingles roof, youll always have the risk of fire by causes like this.

    On the other hand, the overlapping and interlocking of the metal sheets give metal roofing high wind resistance.

    Read Also: How Long To Install New Roof

    Common Types Of Wood Used To Build A Roof Over A Deck

    It involves beams and rafters, and because the deck is an exposed place, it is wise to invest in building materials to withstand different harsh weather conditions. The sizes of the beams and rafters to use are 6×6, 6×2, 8×2, 10×2.

    Here are some wood beams and rafters materials to choose from:

    Cedar Wood

    Cedar is a popular choice because it is resistant to rot and insects. It is also readily available and not heavy. It is the best material for an already existing deck as it will not exert too much pressure on the existing wooden board.

    But the trick to brighten its surface is to apply a sanding sealer and clear varnish after it has been installed. The price of cedar is $3-$5 per square foot.


    Compared to cedar, redwood is a better material but costs more. They cost between $6-$8 per square feet depending on the region and availability.

    But redwood is hard to find in the eastern states compared to its availability in the western states.


    Indigenous eucalyptus is among the hardwoods found in tropical areas. Mature trees with more than twenty years to their belt can last fifty years and beyond when treated with oil-based products.


    Pine is the most common building material because the wood is inexpensive, light, and straight. However, pine is a softer wood and is not resistant to insects. Therefore, its best not to leave pine exposed without painting is to seal it from moisture.

    Bearing Location Of The Roof Over A Deck

    Building A Hip Roof Over A Deck

    For a concrete pad, you may be able to attach post brackets anywhere on the pad to support a small roof but not so with a deck. Installing a post on decking between joists will cause the weight of the roof to punch the post right through the decking. Causing the roof and deck to collapse. I dont know how many thousands of squash blocks I have installed in my career, but I assure you that whenever you have a focussed load, you need support directly under it. Either in the manner of additional beams or blocks to transfer the load. Decking alone cannot support the weight of a roof.

    Recommended Reading: How To Afford A New Roof

    Types Of Flat Roof Construction Warm And Cold Flat Roofs

    Flat roof construction can come in the form of a warm roof or cold roof depending on the requirement of the owner and architect as they relate to the building regulations regarding heat loss and insulation.

    Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists. This air is vented at either end of the roof to allow a continuous air flow.

    In terms of rules on ventilation, BS 5250: 2011 is the document to view. It states that there should be at least a 50mm gap between the underside of the roof decking and the insulation below it.

    The design of the roof, either warm or cold, must be precise. If a warm roof is not fully packed with insulation, yet a constant air flow is not achieved, condensation will form in any unvented void. Condensation forms as warm air hits cooler surfaces and can rot the roof from the inside out.

    You will need to look at Approved Document C and also Approved Document F of the building regulations as these documents will help you calculate the amount of ventilation that will be required for your particular project.

    This type of condensation is called interstitial condensation. This warm vs cold roof situation also occurs in pitched roofs and it is vital, in simplistic terms that either no air is allowed into voids or a constant air flow is achieved.

    Building A Roof Over A House Deck: A Simple Step

    Whether you can build a roof over a deck is a question a lot of people ask, alongside can a deck support a roof?

    The short answer is yes, you can build a roof over your deck. Whether your deck can support a roof, however, is a different question. Although most decks can support a roof, some cant. Building a roof over a weak deck is dangerous and may contravene local building codes.

    Lets dive right in to determine whats allowed and whats not and, more importantly, how to build a roof on a deck where its allowed.

    Read Also: How To Get A Free Roof For Your House

    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 . Since the in-stock 12-ft. panels didn’t quite reach the beams on Rune’s 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.

    Bbqing All Year Round

    build gable roof over deck / porch

    When you cover your deck, using the BBQ all year round can happen when you have protection from the sun and rain. Covering a deck means you can install better lighting and even ceiling fans to keep you cool while you slave over the grill plate in summer.

    In the cooler months, it may take a little longer for food to cook, but its worth it when you can enjoy delicious burgers, ribs or grilled vegetables.

    If you want to go all out Installing a TV will make it the place to relax with friends, watch the cricket and put the snags on the BBQ. We have two local electricians that we recommend for all electrical installations and upgrades for our decks and pergolas.Multivolt Electrical services or Brissy Electricians

    Also Check: How To Coat A Metal Roof

    How Do You Attach A Roof Ledger To A House

    Attach the ledger with 1/2-inch-diameter lag screws or bolts every 16 inches . Slip stainless-steel washers between the ledger and the siding to allow water to flow behind the ledger. If you can.t get behind the joist to cinch down nuts, use lag screws.How do you cover an existing deck?9 Ways to Cover Up Your Old Deck

  • Wooden Design Interlocking Deck Tiles. What is this?
  • Composite Decking. What is this?
  • New Deck Boards. What is this?
  • Power Wash, Stain, and Seal.
  • S Of Roofs Over Decks

    Another great thing about installing a roof over your deck is that you can personalize it to match your style and tastes. The pictures were showing below are just a few of the ways you can build your decks roof. Some homeowners like to have an idea in mind before scheduling an appointment with a construction company while others like to listen to the recommendations of the experts before they begin any decision-making. Take a look at the pictures below to see which ones you like. Then, give us a call to schedule a consultation.

    These homeowners are in the process of building a flat roof over their free-standing deck. We cant wait to see how it turns out!

    This homeowner chose a short roof with lights underneath. The lights will not only add functionality for nighttime, but theyre also aesthetically pleasing.

    This homeowner chose the best of both worlds by adding a roof to their deck that still allows light in.

    Were loving the look of this gable roof over the patio in their backyard. Its perfect for hanging out night and day, rain or shine.

    This flat roof acts as both a covering for a section of the first-floor deck as well as a balcony for the second floor of the home. Now, thats what we call efficient.

    Read Also: What Is Considered A New Roof


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