Roofing – Under the Shingles – What’s Under the Asphalt, Metal, Wood, Rubber Or Clay Tiles on a Roof

Imagine, you’re standing on the sidewalk, looking at an average house. You see the siding, the windows, the front door, and way up above, you begin to see the roof. Does the roof have asphalt shingles? Wood shakes perhaps? Maybe it’s made of metal or rubber tiles? What you see is where the focus goes, but it’s what you don’t see that really matters. There’s more to roofing than meets a person’s eye. So let’s talk about what are the results, under the shingles.



The Roof Deck

We learn to crawl before we walk, so when talking about roofing let us start with square one, the outer lining area of your roof which will be made of wood. Your wood roof deck is comparable to an automobiles metal body. It really is installed on top of the basic house frame to give an area on which to install Shingles. With no roof deck installed in your house, there would be nowhere to install your Shingles. Not to mention without the shingles, your roof deck would rot away due to exposure to the sun, rain, snow and ice and etc … not a comfortable home at all!

On Newer Houses, sheets of plywood or OSB boards are fastened on top of wooden trusses in your attic to make the roof deck. Plywood or OSB boards are installed in a staggered formation with small spaces between them to allow wood to expand and contract as the wood heats in the summer and cools in the winter. Older homes usually have lengths of 2″ x 6″ installed instead of plywood or OSB board. If the time comes for you to supercede your Roof System, remember to have your Calgary Roofing Contractor replace any and all damaged wood.

Remember, if your roof deck is rotting or damaged in any way, people walking on your roof could potentially crack or break through the wood, causing further injury to the roof system, such as for instance to the shingles… and also to the person who walked about it! However , most roof decks can withstand a little bit of experience of water or ice before it needs to be replaced.

Metal: Drip Edge and Rake Edge

Drip edge and Rake edge may be the first part of the Roof System to be installed. It’s a long and narrow bit of metal which is installed along each end of your Roof Deck, ie: over the eaves trough and over the gable ends.

Some area local building codes require the installation of Drip Edge and Rake Edge and other building codes do not. Consult your local city building offices to find out. In Alberta for instance , the Building Code doesn’t require the installation of Drip edge or Rake edge. Therefore many new homes and/or low budget roof systems would not have drip edge installed to be able to allow for more affordable roof prices. We recommend however that Drip edge and Rake edge be installed on every Roof System, no exceptions.

Drip and Rake edge is available in a variety of different colors and sizes and will be custom built for the needs of your roof system. Installing a suitable drip edge often saves hundreds and sometimes even thousands of dollars as soon as your roof system needs replaced.