deteriorated roofing shingles on a home

Time For A New Roof Installation?

You moved into your house many years ago and everything was looking well-kept and in good shape. But time marches on and you are beginning to notice your roofing shingles are looking a little old and deteriorated. If your existing roof is more than 20 years old, it may be time to consider re-roofing your home.

Here are five things you should know before you begin calling contractors about the job.

1. Do you know if your existing roof is a single layer of shingles or a double layer?

If it is a single layer, you may be able to cut costs and add on one more layer over the top. If it is already a double layer, you will need to have a complete roof tear-off. With the complete tear-off, the roofing contractor will strip off the existing shingles right down to the plywood decking. Occasionally once the roof decking is uncovered, it may also be in need of repair or replacement, especially if the roof had leaked at some time in the past.

2. When you are choosing your new shingles, there are several different types

Owens Corning Architectural Roofing Shingles On A Home

Owens Corning True Definition Duration shingles shown in quarry gray. Photo courtesy of Owens Corning.

Most of them are asphalt-covered fiberglas shingles, but some are higher-priced such as slate shingles or real wood. Generally, the asphalt shingles are used on most homes.

There are also several types of asphalt shingles, including 3-tab straight shingles and “laminate” or “architectural” shingles that simulate the look of wood shingles. The basic 3-tab shingles are the lower price point and will most likely last from 20-25 years depending on the quality of the product purchased. The laminated shingles provide a multi-dimensional look and are thicker than 3-tab shingles, with warranties that go up to 30 years. There are many colors and styles to choose from and you can look online at several manufacturer’s websites to review the options.

3. When contractors arrive to estimate the roofing project . . .

they will measure the area of your roof to determine how many shingles need to be purchased and applied. Roofing shingles are measured in “squares”. One square of shingles is the quantity needed to cover 100 square feet of roof area. Once the contractor measures the square footage of roof space on the home, they will add on a certain amount for waste, overlap and cutting around corners, eaves, rakes, chimneys and other elements.

Roofing shingles are sold in bundles and the number of bundles per square will vary depending on the thickness of the shingle. For the typical three-tab strip shingle, three bundles will cover one square of roofing area. For thicker, laminate shingles it may take 4-5 bundles to cover a square.

The upgrade to a laminated shingle can be well worth the additional cost as it will not only add to the overall curb appeal of your home, but it will also last longer. They can be a great selling feature if you are considering a move in the future.

4. Make sure the application of a weather-shield layer around the edges of the roof, is included.

This is very important around edges, in valleys, eaves and rake areas as well as around chimneys where flashing is used. The weather shield layer will provide extra protection against interior water leakage by shielding the roof decking from moisture caused by ice damming in winter. Ice damming occurs when snow piles up on the roof edge. Under the heavily-piled snow ice will form and melt from the freeze/thaw cycle. This water will have a tendency to travel upwards on the roof, finding its way underneath both the shingles and underlayment and eventually through the decking and into the home.

The weather barrier layer should extend up at least three feet from the edges of the roof. In this picture you can see where the weather barrier is applied underneath the roof shingles. Owens Corning Roof With Ice And Water Barrier

5. How To Find The Right Contractor.

First, you can begin by asking friends, neighbors or co-workers if they have re-roofed their home and if they had a good experience with a reputable roofing contractor. You can also obtain a good contractor from a shingle manufacturer’s website. For example, Owens Corning manufacturers excellent quality roofing shingles and lists the names of contractors that are part of their OC Preferred Contractor listing from their website.

Your roofing contractor can also help you by providing references of other homes completed in your local area and by showing you examples of certain shingles that you may be considering. They can also recommend the best style and color options that would look the best on your home.