Replacing a roof is no small feat; even the cheapest replacement can run into thousands of dollars depending on the size and type of roof. Because your roof is your first line of defence against elemental damage and it will last for decades, you should be keen to ensure you get it right the first time around. This article highlights mistakes homeowners commonly make, and which could affect the integrity of the entire roof within a short time. Read to learn more.

1. New shingles can always be placed over old shingles

There are certain advantages to placing new shingles over the existing shingles: first, you save time and cost of labour and disposal in the tear-down. You can also gain extra protection and insulation from the double roofing layer.

However, there are more things to think about before choosing this option. For instance, tearing down old material can reveal hidden problems like rotten decking or water damage. Most probably, you're replacing the old roof because it was weakened or structurally damaged, which means you may carry the same problems under your new roof.

What's more, roofs are heavy, and the walls and trusses are designed to carry a specific amount of weight. You must ask yourself whether the extra weight is really worth it, considering you may just be carrying extra problems under your new roof. Often, you'll find it's better to remove the old roof and install a new one on sound structures underneath. You'll need to talk to a roofing specialist to get a better idea of what will work best for you. 

2. I don't necessarily need to replace my gutters

While the main job of your roof is to protect your home, it also serves to redirect rainwater away from your house, where it can cause damage. The gutters and downspout are the last bits in this system, and if they're not working properly, you may start getting water damage and leaks in your roof, particularly in wet seasons.

When replacing your roof, consider replacing your gutters if they're old or damaged. Not only will this make your roof look good in the end, it will ensure that your new roof is protected from water damage for a long time. In addition, you should keep your gutters clean by removing debris that may lead to clogging.

3. I don't need to replace my flashing

Flashing is a name given to the thin sheet metal pieces whose job is to stop water from passing through angles or joints into your home. The decision to reuse or replace your flashing can make a significant difference in the final cost of replacement, which is why many homeowners choose not to replace the flashing if it has no obvious problems.

Now, flashing is usually nailed onto your roof, and it's critical that this is done properly to prevent leakage. Most often, roofing leaks can be traced back to the flashing. After twenty or more years with your old roof, can you really vouch for its integrity for another 20-50 years (the lifespan of your new roof)? If the flashing has already been repaired in the past, are you prepared to start repairing your roof soon after installation, because that's what's likely to happen?

This why roof manufacturers recommend installing new flashing during roof replacement, even though building codes usually allow you not to.