The GutterBrush Blog

Do you need a new roof? Are you trying to decide how to save some money on the job? One way people try to do this is to place the new roof installed over an existing layer of roofing. This technique is quite common in many areas and many roofing contractors don’t see any problem with this method and have no problem trying to sell homeowners on a lay-over or go-over as this technique is called.

Don’t do this. EVER.

Here are the top five reasons laying a new roof over an old one is a terrible idea.

First, there are sure to be areas that have or had leaks and they can’t always be addressed properly

There is a good chance that your old roof had some problem areas including possible leak spots, whether you noticed them or not. Without tearing off the old roof and properly identifying these types of trouble spots and determining where the leak was coming from and traveling to it is impossible to tell what areas of your roof may need some special attention.

Second, any rotted wood under the existing roofing will only get worse leading to an even more expensive fix down the road.

There could be areas that have rotted wood hiding under the old roofing. These rotted areas need to be identified and replaced before a new roof is installed. Obviously if your roofing contractor is only doing a lay-over roofing installation then these rotted areas will remain covered up and only get worse as the years go on. Also the nails holding down the shingles in areas with rotted wood cannot properly do their job and you have a much higher risk of shingles blowing off in those areas.

Third, the eaves, rakes and valleys always need special treatment and not doing so will cause more costly repairs later.

This is a big one. The eaves, rakes and valleys of your house need special attention when your home’s roof is being installed. This is especially important in colder climates like Massachusetts, where we are located. In the winter time the eaves of your house are under attack by Mother Nature, whether it is through ice dams, snow build up, or just the constant freezing and thawing that occurs throughout the winter season. When a new roof is properly installed the roofing contractor needs to put new aluminum drip-edge around the entire perimeter of your roof.

Next they need to apply a 3 foot wide section of ice & water barrier around the perimeter as well as in any valleys on your roof. Then they can begin to install the new roofing. Without tearing off the original roofing there is no way to properly install the new drip-edge or ice & water barrier. On a lay-over type of roofing install, the roofing contractor is counting on the existing products on the home’s roof to still be up to par and be able to handle the winter conditions. All too often the old products fall short whether it was because they have outlived their lifetime, were sub-par to begin with, or maybe they were never there to begin with (all to often the latter is the case with ice & water barrier).

Fourth,  the extra roofing weight is no good for old rafters and can cause structural failure and safety hazards in the structure.

One of the more obvious problems with a lay-over re-roof is the added weight of the extra layer of shingles. On most newer homes this is not an issue, however many older homes have rafters that are considered undersized by today’s framing standards. It is not uncommon to see 2×6 rafter systems on many of these houses. Now in most situations a 2×6 rafter is undersized to begin with and you certainly don’t want to be adding the weight of a new roofing layer on top of an old roofing layer to these already undersized rafter systems.

Fifth, adding a roof on top of another roof will lead to a shorter roof life expectancy.

Most responsible roofing contractors agree that a lay-over roof will decrease the new roof’s lifetime by about 25%. This fact alone means that any money you might have saved by doing a lay-over, as opposed to a tear-off and new roof install, was only a short term savings. In addition, you now have 2 layers of roofing that will need to be removed the next time your roof is done and that will also add more cost to the job

Tearing off the old roof and then installing a new one is always superior to laying a new on on top of an old one. And as always, do not forget your gutter protection system needs!

GutterBrush can prevent this from happening.

Excessive amounts of water overflowing from your gutter system could cause a number of serious problems around your home, some of which could cause you hundreds if not thousands of dollars to repair. But there are just some things that no gutter protection system, even GutterBrush, can solve. One of those situations is a heavy deluge of rain that courses down a roof’s slope and into the gutter with such force that it can not be properly channeled into the gutter and out the downspout. However, leaking or overflowing gutters should never be ignored and a properly installed and clean gutter system should function to move water safely down the gutter and out the downspout in every other type of rain. If they leak or overflow during normal conditions perhaps we can help you to maximize the effectiveness of your gutters and gutter protection system during normal rainfall conditions.

First, if your house is fairly long where the gutters are continuous along the entire length and the only downspouts are on both ends this could cause some over flowing and leaking to occur. Most homeowners prefer this gutter/downspout configuration for aesthetic reasons because a downspout does not have to be installed right in the middle of the house which is usually right near the entrance to the house. However, often times only having a downspout at the end of the gutter system leads to the inability for the gutter system to handle the volume of rain that is falling. An effective solution to this problem is to have the one end raised just as high as you can so that the flow will be sufficient for the water to exit the preferred main exit end before ever running over. You can also investigate the installation of a large gutter on your home’s exterior to accommodate larger volumes of water flow.

Second, make sure your gutters are not leaking as this can lead to the misidentification of the problem you face. To quickly and effectively repair a leaky gutter, first remove debris and wash out the gutters with water. Second, apply a silicone gutter seam sealant to gutter seams, exposed nail/screw heads, and minor holes as needed. Third, you should absolutely replace any section of gutter that is pitted or rusted through. Fourth, make sure that all gutter sections are secured properly to the fascia boards and replace any rotted fascia boards as needed. Fifth, install drip flashing around all roof edges. Finally, fill the gutters with water using a garden hose to check for leaks and proper drainage. Next time it rains watch the gutters for leaks and overflows. If water still overflows the gutters, then you may need to adjust the slope towards the downspouts and or add additional downspouts as previously mentioned. In addition, you might consider installing larger downspouts that will help prevent gutter overflow but these should be coupled with the installation of downspout extensions to divert water away from the house structure in order to avoid costly water damage to your property.