How to Build a Roof Deck On a Pitched Roof

It might be quite difficult to do, but with our tips, you will succeed

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Having a roof deck on your roof is the most beautiful thing. This is why quie many homeowners are dreaming about it. Having a roof deck means that you have an extra space to relax and enjoy warm summer evenings with your family and friends. 

And if you are going to build a rooftop deck on the pitched roof of your house, you may want to know how to build a roof deck on a pitched roof.

Constructing a rooftop deck on your own, particularly on a pitched roof, might be difficult. This is what you should take into consideration at once. However, you can do it perfectly if you follow the step-by-step guideline that we have prepared for you today.

From this article, you will learn how to build a roof deck on a pitched roof by yourself. We will explain what tool you will need, how to get ready for the building process, and what permissions and other papers from your local authorities you might need to get before you start. With all that, building a deck on a sloped roof will mecome much easier for you.

Beautiful pitched roof terrace
By vista.com

How to Build a Rooftop Deck On a Sloped Roof

Having a rood deck when your house roof is sloped is great, and hot only because it looks cool and attractive. Of course, most of us praise such decks for the ability to walk out of your second-floor house right onto your deck in the morning to enjoy the sun and fresh air. But the view is one of the finest reasons to install a deck in fact! 

Of course, you want to have a good time on your pitched roof deck, but in order to be able to enjoy it, you have to build it correctly. And that is when most complications come up to the stage.

The very first thing that you need to consider when going to get such a deck is that the construction beneath the joists on a floating deck with a pitched roof demands a different technique. See, unlike decks that are built on the ground level, floating roof deck construction does not require a ledger linked to the house’s rim joist.

Instead, a frame for the deck is made by a couple of beams that are resting on supports known as sill plates. Everything that is located above the beams is the same as it is for any other deck.

In order to help you out and make it clearer for you how such decks should be consructed, we are going to provide you with the step-by-step guideline below. Like this, you can undergo the entire process moving from one section to another, being guided by our tips and recommendations. 

But before your begin, you have to get ready to build a deck on a sloped roof of your home. For that, a couple of nuances need to be taken into consideration.

Gather All The Necessary Tools

Getting the appropriate materials and tools is the first and most important step in creating a rooftop deck. You need to have everything prepared in advance so that you don’t have to worry about it during the building process.

The deck framework, the support beams, and the deck material are the three most important components of a rooftop deck. So make sure that you have prepared the following:

  1. Long-lasting lumber for the beams
  2. Sleepers, plastic number or wood for the deck framing
  3. Synthetic decking materials such as PVC or composite wood.

Obtain the Required Permissions And Clearances

If you want to have a floating deck on the roof of your home, you can’t just build it whenever you feel like. Such construction work should be approved by your local authorities first of all to make sure that the deck will not harm anyone or anything around and it is build according to the standards.

Before constructing a floating roof deck, be sure your area permits it. In some locations or towns, a roof deck may be prohibited becaus eof the zoning restrictions and construction requirements. So make sure that your area has no such restrictions!

Fulfill the criteria for a deck atop a pitched roof from the authority office in your region. Any unique setbacks should be communicated to your architect.

Relay to your architect any special setbacks, such as rules that the front of the deck start 8 feet behind the roof ridgeline or that the height of the deck be no more than 2 feet above the midpoint between the gable and the rear of the roof. 

These requirements help keep a roof deck's framing compact and hide the deck from the street in historic districts with older row houses.

Like this, with all these factors being taken into consideration and all the nuances being checked and solved, you can now move on to he floating deck of your dream! After the preparations are done, you can proceed to building a deck over a roof. 

Work On Sill Plates And The Support Beams

Cut the support beams and necessary sill plates from the lumber you occupied. For that purpose, you will need about four pieces of 1-foot 2-by-6 timber for the sill plates.

The architect will supply specs for the support beam, although it will most likely be made from a 4-by-10 bit of timber. 

Then, drill every 3 feet along the edge of the beams. And then install a galvanized lag nail on each.

At the rear face of the lumber, fasten with a washer and clamp. Use a ratchet wrench to firmly secure the nuts.

Joining The Beams With The Sill Plates

Place one beam straight on the front set of sill plates of the sloping deck. In order to find actual verticals, we suggest you get some help to hold the beams in place. For this purpose, using a spirit level will be the best solution.

Over one sill plate, add a hold-down, a sturdy metal angle bracket on each surface of the beam. Mark the hole on the hold down on each sill plate. Then attach the beam aside. To finish the framework of your roof deck, keep on moving with the cycle with a backset of sill plates and support beams.

Set The Threaded Rod

To undergo this process successfully, make sure that you follow the simple sequence of actions:

  • drill trial holes with a 3/8-inch wooden drill
  • place a threaded rod through the holes to male the sill plate stay in place

You should drill a small nick in the roof surface with the drill bit to mark the start of your pilot hole. Also, when drilling, we recommend you press the drill bit slightly through the shim to nick the roof surface. It will help you to mark the beginning of your pilot hole for a threaded rod to hold the sill plate in place. 

You can also switch to a hammer drill with a long 3/8-inch masonry, bit if you are continuing into brick. Keep on drilling into the structure of the roof to get deep enough so that it is possible to accept a 3/8-inch threaded rod, which serves as an anchor. 

Allow the Threaded Rod to Cure 

The curing should be done according to the epoxy manufacturer’s recommendations. So if you are not sure what they are, better check in advance. In order to attach the hold-downs, sill plates, and shims, do the following: 

  • screw a nut on the top of every threaded rod
  • secure it when the epoxy has cured
  • apply this technique on every sill plate

Check the Beams

Beams should be paid close attention to if you want your floating deck to be constructed properly and serve you long enough. 

  • place the beam between the hold-downs
  • mark the holes in the top arm of the hold-downs where it touches the beam
  • drill through these marks with a wood drill bit
  • press a galvanized bolt through the hold-downs and the beam
  • add a washer and nut
  • tighten

The Setting Stage

At this stage of the building process, you need to place the rear beam over the rear sill plates. If you are lucky and the architect whom you have hired has planned elegantly, and if your roof slopes smoothly, your deck joists will run from the front beam to a joist sitting atop the rear beam. Like this, it will create an even deck surface above your sloped roof. 

On a steeper sloped roof, the rear beam may instead have to be raised on brackets atop 6-by-6 posts supported by the sill plates to create a level deck.

Installation Of Joist, Framing, And Deck Boards

Make sure all the beams are secured perfectly. After this is done, the joists, framework, and deck boards should be installed according to the manufacturer’s recommendations.

Like this, you now have a detailed and step by step instruction on how to construct a floating deck on your sloped roof by yourself. We explained what permissions you will need to get before you start the building stage, and also, you are now aware of what tools you will need to use for this type of work.

In addition,  having such a precise guideline, you will be able to clearer understand the specifics of the building process. So even if you don’t feel confident enough about building a deck yourself, and you decide to hire professionals to get the job done for you, at least you now understand how the process will be going. It will help you to keep the situation under control.

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