The Proper Way to Install a Residential Roof
The Proper Way to Install a Residential Roof
To begin, the contractor will remove old shingles from the roof. This is a labor-intensive step but it's crucial to prevent premature roof failure.
The contractor will install metal flashing at the gable ends, chimneys and front walls (wide metal flashing). He will also nail new drip edge along the bottom of the roof.
Flashing
Flashing is installed wherever there's a gap in the roof into which water could seep. That includes the corner where a dormer meets the wall, the chimney, the kitchen vent, and even skylights.
Some roof features require a two-part flashing system, such as chimneys. Base flashing is placed underneath the chimney and then counter-flashing is positioned above it. This allows the materials to move as they expand and contract due to changes in temperature.
It's important not to nail the flashing to both the wall and the roof shingle, which can cause it to develop a wrinkled look. This is an invitation for leaks to begin. It's also important to choose the right material for your flashing. Copper is a good choice because it doesn't develop a rusty surface and it looks great with a variety of different roofing types.
Nails
Even the smallest details can play a big role in the performance and durability of your roof. For example, if a nail is driven above the shingle’s nails zone (also known as a “high nail”) it will not secure the shingle properly. This can cause the shingle to come loose or blow off in windy weather.
The shingles’ manufacturer will provide specific instructions for positioning and driving the nails. Unfortunately, many installers fail to follow these directions. This often results in misplaced or overdriven nails.
Nails should be galvanized steel, stainless steel, or copper to provide the best corrosion resistance. Avoid using aluminum nails. They can oxidize and leave the sheathing board exposed to water.
Sealants
Sealants protect the roof from moisture and sun damage. The type of sealant you choose depends on the scope of your project and your region's weather conditions.
Silicone sealants are able to withstand heavy rains and provide a waterproof barrier. They're also designed to reflect sunlight, which helps keep homes cool and decreases air conditioning use, saving on electricity bills.
Acrylic sealants are made to deflect UV rays and offer moderate moisture resistance. They're popular in western and southwestern states where roof sun damage is a common concern.
Polyurethane sealants are resilient against water but not as resistant to UV rays. They're ideal for sloped roofs, where standing pools of water are less likely to occur. Thicker solvent-based sealants are thick enough to apply by brushing or rolling, while thinner liquid-based ones are more easily applied with a paint roller or caulking gun.
Installation
While savvy DIYers can save money by learning how to roof their own homes, it is still a very big job. It takes time, effort and quality materials to get it done right. It is also important to understand best practices for safety and quality, especially with roofing panels or shingles.
Install ice dam protection in regions that require it: This is a synthetic waterproof barrier material that prevents melting ice from backing up under shingles and penetrating sheathing. Then, apply a layer of asphalt roofing paper over the sheathing.
Contractors then fit the first course of shingles to the sheathing. They should follow the tile manufacturer’s layout recommendations for positioning and nailing. For example, shingle exposures should be equal with a head-lap of at least 3 inches (unless the tile specifies a different lap). Metal roof panels are fastened either by clips or a screwing flange that allows for thermal expansion and contraction.
The Proper Way to Install a Residential Roof To begin, the contractor will remove old shingles from the roof. This is a labor-intensive step but it's crucial to prevent premature roof failure. The contractor will install metal flashing at the gable ends, chimneys and front walls (wide metal flashing). He will also nail new drip…