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How To Construct A Roof

What Access Requirements Are Needed To Install My Green Roof

How to Build a Roof

For smaller DIY projects with limited access, all of the components that make up the green roof system can be carried by hand. Each of our green roof membranes along with our waterproofing compound weigh no more than 25kg. The growing substrate can also be purchased in 25kg bags.

If you have roadside access for a lorry with a grabber then you can potentially have the heavy stuff lifted onto the roof space.

Let Dry And Enjoy Your New Roof

Let the roofing adhesive dry before performing a thorough post-inspection of your roof. During this process, check for any loose nails, excess roofing seams, areas with cracked adhesive , and other areas to redress. Repeat the process until you have resolved all possible issues of your roofing installation.

Install Step And Dormer Flashing

It’s possible to reuse existing step flashing and dormer flashing, but the best way to get a watertight seal is to tear off the siding in those areas and install new flashing. Start by running self-stick underlayment at least 6 in. up onto the walls. This provides an additional barrier if water does get past the flashing. Cover the front wall first and then work your way up the side wall. Overlap the sidewall underlayment around the corner onto the front wall about 1 in. or so.

Install the shingles right up to the front wall. Cut a couple of inches off the vertical portion of the dormer flashing, and run the horizontal portion past the side wall that same distance. Nail the dormer flashing to both the wall and the shingles.

Make a 1- to 2-in. cut with a tin snips at the bend in the first step flashing. Run a bead of sealant on the corner edge of the dormer flashing, and then run that step flashing past the dormer flashing the same distance you made your cut. Bend the step flashing around the corner onto the dormer flashing with your hammer.

Install your next row of shingles over that first step flashing, then cover that row with a step flashing, and so on. Nail the step flashing to the wall toward the top of the flashing at the end that’s closer to the peak, so the next step flashing in line will cover the nail. Don’t nail them down through the shingles. For information about flashing around chimneys, see Installing Chimney Flashing.

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Add The Roofing Material

Now the roof cover material can be installed. If working with tiles, shingles or slates, timber battens will need to be installed. For more information, take a look at our guide to slating a roof and our guide to installing cedar shingles.

Dont forget to install ridge tiles, or opt for a dry ridge system, to ensure the ridge is weathertight and waterproof. Additionally, guttering, fascia and soffit boards may be required. For more information on the difference between fascia, soffits and capping board read our guide.

Got any further unanswered questions that need answering? Call our team of experts on 01752 692 760 or use the live chat and they will help wherever possible.

How Much Does It Cost To Install A Green Roof

How To Build A Shed Part 4

The good news is that with an extensive green roof on a flat roof you can do the install yourself at no additional cost. If you want to get someone else to install the green roof, then the cost of green roof installation will depend on the contractor. Be sure to ask lots of questions around the design and how long it will take. Its best to get a few different quotes to compare before opting for one contractor.

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How To Build A Lean To Roof

For Building a Lean to Roof on a House we have to follow some construction steps,

How to Build Lean to Roof

Step 1: Mark the area where the structure is to be built either as an addition to the existing building or as a separate entity.

Step 2: Measure 8 feet from the existing structure towards the outer direction as to not interfere with the foundation of the existing structure when digging the hole. Now dig a deep hole.

Step 3: Now put the post in the hole and fill the hole with concrete in order to set it in that place.

Step 4: From this existing post, measure 3 feet distance in the same direction. Then excavate a hole again and drive the second post in. Replicate this same process for the third and fourth posts. Make sure to maintain the equal distance as before in between the posts.

Step 5: On top of the posts cut out a notch, this is where the supporting post would be resting.

Step 6: Now, place the supporting posts into the notches and fix them properly.

Step 7: Now as this structure is ready, attach the metal purlins on the outward side of the posts installed before. Nails must be used for this step so that it is attached firmly in the place.

Step 8: Fasten it with the help of a nail gun on the side of your existing structure. Use high-quality screws to drill in with the nail gun. The upper end of the rafters will be attached to this.

Step 10: Set the roofing material on it by attaching wooden planks at regular intervals on top of the roof as done previously.

What Is A Hip Roof

Hip roofs or hipped roofs are perhaps the second most common type of roof after gable roofs.

What is the difference between a hip vs gable roof?

Hip roofs are composed of slopes on four sides that come together to make a ridge at the top, while gabled roofs have two sides.

This variance makes hip roofs even more ideal for snowy and icy areas, since the slopes allow precipitation to run off the roof easily.

Hip roofs are also considered to be more stable than gable roofs due to the inward pitch on all four sides coming together.

Hip roofs also provide more shade than gable roofs since there is an overhanging eave on all four sides.

Hip roofs often include design elements like front gables to highlight a porch or entryway, or dormers or crows nests to add extra storage or living space underneath the roof.

They can be crafted from most standard roofing materials like asphalt shingles, standing seam metal or metal tiles, or clay or concrete tiles.

While hip-style roofs tend to be more expensive than gable roofs due to their more complicated design, they are still fairly common due to their versatility and durability.

After all, hip roof framing and overall builds require more materials and more expertise to construct, but you do end up with more stability and storage and living space underneath the roof.

And of course, regular care, inspections, and maintenance are required to keep your hip roof in the best possible condition.

Also Check: How To Install Skylight On Metal Roof

Assembling The Shed Roofs Substrate

The substrate is the surface where the roofing is applied. In many cases, a roof cover board is the best option for this, and there are several types. They are generally thin substrates that are installed between the insulation and membrane layers of the roof. They can help you avoid blistering in the roof system from the insulation off-gassing when coming into contact with certain adhesives being used for the roof.

The different types of roof substrates or cover boards are:

  • Plywood/OSB
  • Perlite
  • Asphaltic

The substrate is installed by being fastened to the structural deck or to an underlying substrate. Many of the best installation techniques include staggering the joists of the cover board in each row and to the joints of the insulation below it. This reduces bridging and gaps between the layers.

A Guide To Constructing A Flat Roofing System

Framing a Roof with Larry Haun

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  • 4th April 2018

    As with the construction of any type of roofing system, it’s crucial to understand the correct process and essential criteria involved in flat roofing construction. While many will contact a professional installation company to complete the job, there are others who will feel confident enough in their own ability to install a flat roof onto the structure.

    Read through our guide to constructing flat roofing to ensure you’re aware of the potential costs, the materials required, and the process involved.

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    What Kind Of Wood Is Best For My Shed Roof

    When getting the wood for your shed roof, you should consider a few things:

    • The slope of your roof
    • The snow load your roof might have to hold
    • A wind that might affect the shed
    • What the roof finish will be
    • The spacing of the rafters- 12, 16 or 24
    • The size of your roof
    • Your roofing budget

    There are different types of plywood that can be used for the roof.

    Measuring The Rise Of Your Sloped Roof

    In order to measure the rise of the roof, you need to figure out the length difference between its two walls.

    Once you know this length difference you need to add it to the width of the common rafter and then deduct from this the value of the seat cut. Measure in inches and multiply it by the length of the run in feet. Now that you have this figure, you have to divide it by 12.

    This number now obtained is the exact measurement of the common rafters which you will need for spanning the external wall and reaching up to the inner side of the wall opposite.

    You need to keep in mind that a very steep roof is not needed for easy water runoff. Just a few inches difference in height generally will suffice, but if you live in areas with heavy snowfall then you can go for a deeper slant.

    How to build a pitched roof frame: Now you have to add a beam from the timber on the high side of your sloped roof. Make sure that this timber has been cut down to the right length.

    In case you are installing off the side of your wall, then you need to bolt the timber in its place, keep it firm and, by making use of a spirit level, you need to ensure that its levelled.

    Another beam of similar length needs to be installed in the other side of your roof in a way so that it lies parallel to the first beam. But this second beam has to be installed at a height lower than that of the first one.

    Before you proceed, make use of a plumb line and ensure that the posts are standing upright.

    Recommended Reading: Replacing Roof Trusses

    Rafter Layout With A Framing Square

    This example is for a roof with an 8/12 pitch

    • Position the square at the end of the rafter board, with the tongue on your left and facing away from you. Position the square with both the 8 inch on the outside edge of the tongue and the 12 inch on the blade on the upper edge of the board. Mark along the backside of the tongue. This is the plumb cut for the roof ridge.
    • Measure form the top of this line down the board to determine the line length, or length of the rafter, less ½ the ridge board. This commonly is a 2-by or 1-1/2-inch board, so the measurement is less ¾ inches. Also exclude the overhang at this point. Holding the square in the same position as before, mark down to the side of the tongue. This marks the plumb cut at the inside of the house wall for the notch to seat the rafter one the wall plate.
    • Add the length of the overhang beyond this mark and mark it. Note the square is turned over. In the example shown this is 12 inches. Cut the rafter at the ridge line and at the overhang line.
    • Then hold the square on the plumb line that marks the birds mouth. Determine the wall thickness or depth of the birds mouth cut and make a mark. Cut the notch, first with a handsaw or portable circular saw, and then finish the cut with a handsaw.

    One method of laying out rafters with a square is called stepping off.

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    How to Build A Covered Porch Roof

    So in this video, were going to have a look at the erection procedure for a skillion or a flat roof.

    Im going to start with a equal height top plate although as youll see in the video no reason why you cant vary heights as you go, youll see that as we proceed.

    So once again if youre going to have a flat ceiling underneath the skillion you need to consider that as you go and you need to .

    And, as usual, Ill get rid of that just to save some confusion, and then well get into it.

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    What Are Major Advantages Of Choosing This Type Of Roof

    • Slight load on the foundation.
    • Low cost of the roofing.
    • You dont need help of the experts.
    • No negotiation with the architect.
    • Additional living space.
    • No special equipment.

    The gable roof design is planned in order not only to withstand wind gust and weight of the fallen snow, but also to evenly spread and convey the roof pressure on the walls and the house foundation. To calculate a gable roof elements, use an online gable calculator.

    Step by step construction of the gable roof:

    1. Make the lathing

    Type of the lathing depends on the aim of the roof. For metal tiles sparse lathing will be suitable, but for bituminous tiles solid lathing will do.

    2. Make a truss system

    Compile the rafters on the ground, and then raise the prepared sections upwards. Each section is fixed to the wall plate. Start with the two outer sections, and align all the middle sections according to them. Other parts, i.e. overhangs, pillars, beams, ridge and so on are installed afterwards as additional elements.

    Usually, the rafters are made of trimmed boards of at least 2×6 inches. The wall plate is made of wooden beam of 6×6 inches. For longitudinal beams and adjacent props all boards of 2×6 inches size are allocated, but double only.

    3. Fasten the wall plate

    4. Mount the ridge

    What Is A Gable Roof Or Gabled Roof

    A gable roof is the typical pitched triangular roof that you see on many houses in the U.S., and its probably what you think of when you picture what a suburban home looks like in most states with the standard peaked roof lines.

    These types of roofs can be fairly inexpensive and simple to build, since the shape is not complex.

    In fact, the standard or basic gable roof is the design that most other pitched roof types are built upon.

    Basic gable roofs can use all types of roofing materials, including but not limited to asphalt shingles, cedar shingles or shakes, slate, and clay or concrete tiles especially if you are building a standard or basic gable roof.

    This versatility makes gable roofs even more cost-effective.

    However, if the roof is more complex and contains hips and valleys, then standing seam or metal roofing tiles could be a better choice since they are more likely to be leak-proof.

    And if you live in an area that gets a lot of snow, it is considered best to use a 10/12 or 40-degree pitch angle for a gabled roof.

    Another reason that gable roofing is popular because the triangular shape allows snow, rain, and ice to slide right off, which is beneficial in most regions.

    The shape also allows for attic storage or even additional living space under the roof, or vaulted ceilings.

    One thing to note is that gable roofs might not be advisable in areas that regularly experience high winds or are located along some of the more common hurricane corridors.

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    Green Roof Drainage & Irrigation

    As weve already mentioned, a green roof drainage layer is an essential part of your green roof. Drainage is so important in a green roof because you need to be able to effectively deal with large volumes of water while still providing sufficient water for your green roof to thrive.

    The green roof drainage layer is usually a HDPE membrane. These can feature cavities or cups that collect water. Water is retained in these little reservoirs until it is required when it is drawn back up by the vegetation.

    Any excess water such as from heavy rain, passes through perforations in the HDPE membrane. The water then travels through to a drainage space below where it can be safely evacuated via the drainage outlet.

    This prevents too much water accumulating and potentially damaging the roots and causing harm to your green roof.

    Note: Our PermaSEAL 8 Green Roof Drainage Membrane does not have perforations. There is still a cavity created below the geotextile fabric as the cups are facing a different way compared with our PermaSEAL 20P Green Roof Drainage & Storage Membrane. For inverted warm roof designs you would have to install the PermaSEAL 20P Green Roof as the perforations aid evaporation, reducing condensation risks.

    When looking for a green roof drainage membrane, you want to look out for:

    • High quality HDPE plastic
    • Easy to install and handle

    Green Roof Irrigation

    Three Installing Green Roof Drainage Membrane

    How To Build A Small Roof – Valley Roof Framing

    After the root barrier is in place, you can roll out the green roof drainage membrane across the length of the roof. If you are using our 20P Drainage and Storage membrane then cavities need to be facing up so they can collect water. With the PermaSEAL 8 green roof membrane, the cavities should be facing down. If in doubt just make sure that the bonded geotextile filter fabric is on the top side of the membrane. Cut the membrane to size.

    Sealing and Jointing Green Roof Membrane

    You can overlap the ends of two rolls of membrane, connecting the cavities. We sell our PermaSEAL Jointing Tape if you want additional protection against roots.

    Important note: If your chosen membrane does not contain an integrated geotextile filtering layer then you will need to install one at this stage. Overlap the geotextile element by 100mm minimum. PermaSEAL green roof membranes contain an integrated geotextile layer.

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