Roof Components Kitchener Ontario CVH Roofing

01 Deck

Sheathing or roof deck usually consists of wood materials like plywood or OSB that is nailed to the roof truss. The deck is your roof’s foundation; a solid roof starts with a solid deck. Any part of the deck that is rotten or warped must be replaced. It is important that only proper cured lumber be used for sheathing as otherwise the roof material may buckle or pull away as the wood dries.

02 Underlayment

Roofing underlayment is used on pitched roof as a second layer of protection (most against the elements while shingles are installed) or for added protection if shingle blow-offs are experienced. When the roof is completed the underlayment can shorten your roof’s life. Felt paper (tar paper) is used as underlay due to its low cost and water resistant properties. There are 3 major issues that tar paper can present. First, it is susceptible to lifting due to heat, causing waves in the roof (this is commonly fixed by removing some shingles and slashing the paper, rendering is useless). Second, it is not breathable. Therefore, it can actually case damage to the roof deck (such as rot) and add heat to the underside of the shingle. Lastly, it tears easily. Since there are at least 130 nails per sheet of ply (4’x8’ decking), you can imagine water will easily get through no problem (ice and water membrane seals nails that pass through it, tar paper just tears).

At CVH Roofing, we do not use tar paper; we use only synthetic underlay. Synthetic roof underlayments serve the same function as a secondary weather barrier with better resistance to tearing, moisture, ultraviolet rays, and are fully breathable. Synthetics are typically polypropylene, polyester, or fiberglass fabric.

03 Eave Protection

In order to get the maximum performance out of your shingles, all other roof components must be carefully chosen and properly installed; however, the shingles themselves will determine the longevity of your roof. Shingles start from 25-year 3-tab choices to lifetime warranties. It is very important to compare the price difference of a number of systems to determine which presents the best value in your situation.

If you live in most of Canada, a 25-year shingle is the cheapest per bundle, but will cost more after it is on our roof. Warranties and shingle construction should be understood before buying, you might be expecting something else.

06 Ridge Cap

The ridge is at the top of a roof where the sides meet to form an angle. The ridge runs the length of the roof, and must be capped with ridge cap shingles.

07 Starter

A starter strip is typically a row of shingle material that is applied on top of the underlayment and drip edge but underneath the primary shingle layer. The starter strip is usually a shingle laid upside down or a strip of shingle material half the width of a shingle. It protects the shingles from wind at the bottom of the roof by being adhered to the edge of the eaves, and it fills in the spaces left by the tabs of most shingles.

08 Ventilation

A properly ventilated attic will keep your roof deck and insulation dry, dissipate heat build-up in the attic space, minimize the potential for ice dams, and extend the life of your shingles.

Having proper levels of ventilation will also help ease your heating and cooling costs and make your home a healthier place. Chances are your roof is in dire need of more ventilation, especially if you see any curled shingles anywhere. Air enters intakes (usually through the perforated soffit) and exits through the exhaust vents.

Having proper levels of ventilation will also help ease your heating and cooling costs and make your home a healthier place.  Chances are your roof is in dire need of more ventilation, especially if you see any curled shingles anywhere.  Air enters intakes (usually through the perforated soffit) and exits through the exhaust vents.

There are many different types of vents; make sure you know what type presents the most value or which is most suitable for your purpose.  If your roofer can’t tell you what types are available, how much you need, and what the best options are, find a new roofer!  The general rule of thumb is that the minimum ventilation required is one square foot of Net Free Air (NFA) for every 300 square feet of insulated attic space.  The split of intake and exhaust I generally accepted at a 50% intake and 50% exhaust ratio.

Venting doesn’t need to be electrical or mechanical to work perfectly well; you should have enough and the proper type for your application.  You may be able to add years to your roof by just adding one vent!

09 Flashing Systems

Flashing systems are a site where many roof leaks occur. Whether flashing is located where roof planes intersect, around vents, or at the chimney, most flashing systems should be replaced when a new roof is being installed.  Think of flashing like a kind of metal angle around chimneys, dormers, vents, skylights, and etc.  A flashing system that is properly installed will have water run over joints, not in them.

Flashing is installed on top of the ice and water membrane.  The most common types of flashing are the following

10 Valley Treatment

The valley (the low point of where 2 roof fields join together making an in ward angle) is a crucial spot that must be installed properly.  A premium ice and water membrane should be installed (even under metal or open valleys) and it should be free of nail punctures near the bottom.  Metal valley flashing may be installed; it can make the valleys last if installed properly, but can also wear and warp with time.

11 Roofing Warranties

A 25 or 45 year covered shingle is not guarantee to last that long.  Shingle warranties cover only shingle defects for the first 4 to 7 years fully, after which they are pro-rated.  So after the first full covered period, the coverage drops yearly until it runs out.  This means on the 10 th year you may only have a very small percentage of the roof material covered, which is by far the least of the expenses.  Manufacturers use impressive sounding long-term warranties to convince buyers that their shingles are the best and will last the longest.  They compete over such features as the length of coverage, algae resistance, wind tolerance, and whether the warranty can be transferred to a new owner.  These warranties can be their main selling points.  However, don’t be taken in; standard manufacturer’s warranties are not worth a dime in most cases, ask any supplier to see how many successful warranty claims they’ve had since in business.  It comes down to proper installation, and making sure the manufacturer is reliable (most large manufacturers warranty coverage is the same), as is the contractor’s track record.  There are too many small outfits running out of pick-ups that change cell phone numbers every year, and with such a high turnover, it tends to give the whole industry a bad name.

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